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Location:
Sydney
Registered:
August 2004
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Air Bypass Valve
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Sun, 23 January 2005 17:42
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just saw this thing on the toymods site, near the centre, it looks like there's 2 hose nipple right? It's for the coolant line right? How do I tap into the coolant lines? I must tap into the flow inside the thermostat (hotter part) right? And where can I find one of these? How expensive are they?
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 02:52
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bump
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:14
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Yes, coolant lines.
Doesnt matter where you tap into them, its all hot coolant.
The question is, why?
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:21
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| CrUZsida wrote on Fri, 11 February 2005 14:14 |
Yes, coolant lines.
Doesnt matter where you tap into them, its all hot coolant.
The question is, why?
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why tap into the coolant? or why I need a air valve?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:22
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Why do you need an air valve?
By the looks of that photo, its also ECU controlled.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:29
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coz my idle is too low when the engine is cold... 
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:34
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Are you running the factory ECU?
Should you actually have one of these?
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:38
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nah, running microtech, 4age with turbo
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:43
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Get a 20Valve ISCV.
Get the microtech programmed to suit (if it isnt already)
Wire it up.
Quick play around with laptop.
Blammo, done.
I'm using a 20valve ISCV on my 1uzfe, running microtech.
Works a treat.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:53
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how does a 20v iscv work? how does it look like and how to connect it up? 
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:57
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Microtech has 2 wires coming out of it that can be programmed for ISCV.
Call whoever you ordered your ECU off, and find out whether it is currently set up for the 20valve one.
The 20valve one has 3 wires.
One for +12volts.
One for opening.
One for closing.
The two microtech wires control the opening and closing.
Looks like
One tube for in, one tube for out.
Providing you don't have quads, there should be an opening on the manifold for it.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 03:58
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Another pic where you can see the 3 wires (and both pipes too)
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:11
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so which wires from the microtech controls the iscv? Coz I didn't think there was any wire from my microtech that's aren't connected
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:17
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I'm only running 2 of the 4 ignition drivers, so unless you have sequential ignition (ie, 4 coilpacks, NOT running wasted spark) then I don't think you can do it.
I'm guessing you are using an LTX8 or LT8S, I think you'll need to convert to waste spark if you have coil packs.
But if you already have wasted spark, or a convential dizzy, then you will have 2 extra outputs unused.
I'm pretty sure the ISCV used ignition drivers 3 and 4.
(I think 0 was tacho, 1 and 2 were for my coils)
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:25
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hmm.. I'm running 4 coil packs, does it mean it won't work for me?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:31
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Do you have sequential ignition, or wasted spark.
It depends how it was set up.
Talk to the person you bought your microtech off.
Or Email tim@microtechefi.com, he should be able to help.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:34
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it's a 4age, which one would it be?
From memory it's sequential as that's what's displayed on the "Dash"
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:38
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Dunno man, 4age's aren't my strong point.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:41
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so if it's sequential, does it mean the iscv will work? or won't work?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:44
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I'm pretty sure it wont work, as you don't have enough outputs for it.
Call tim @ microtech, or get incontact with dale http://www.braidedlines.com
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Location:
Sydney
Registered:
August 2004
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 Re: Air Bypass Valve
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Fri, 11 February 2005 04:50
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yeah, thanks, I'll get in touch with Tim @ Microtech later when I have more time, thanks for your help anyway...
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 04:53
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Only other option is to use a Nissan style one.
They are based purely on coolant temp.
Its just an open/close solanoid that is controlled by coolant temp.
When the coolant is below 70ish degrees, its wide open
Once it hits 70ish degrees (or whatever its designed at) it slams shut.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 05:01
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so the valve in the pic of my first post aren't controlled by coolant temp?
I tried going to the pick & payless wrecker once to find the idle valve that people always talk about, but I don't know where to find it...
but I'll still need to find a way to connect the water lines right? How do I tap into the lines? Do I have to get some adaptors welded? or just get the brass fittings?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 05:07
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I'm not sure how the one in the pic at the top works.
It looks like it has a connector, but what controls it, I don't know
It could be ECU switched, it could simply be power.
You will find an external water jacket somewhere on the motor.
It usually runs under the throttle body, adding a bit of warmth to it in cold countries.
Have a look for it. And just tap into that.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 05:21
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so that will have water flowing through there already? How does it look like?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 05:31
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Just looks like a radiator hose, but only 10mm wide.
And will be hot to the touch.
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Registered:
March 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 05:37
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The top diagram of the bypass valve is what I'm using.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 05:49
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thanks for the help CrUZsida, I'll have a look at the engine later, I have to go out now, thanks again..
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Location:
Brisbane
Registered:
May 2002
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Re: Air Bypass Valve
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Fri, 11 February 2005 08:48
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| CrUZsida wrote on Fri, 11 February 2005 16:07 |
I'm not sure how the one in the pic at the top works.
It looks like it has a connector, but what controls it, I don't know
It could be ECU switched, it could simply be power.
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Bingo, its just 12v when the ignition/engine is on.
Its simple as anything.
I was under the impression that the water input was for REALLY cold climates...and I thought some cars/engines, RA65's with 22re's for example came with ABV's that weren't water cooled. I doubt it will get too hot if it doesn't have water going through it, so I'd try it without water first and see how you go...
Cheers
Wilbo
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Location:
Melbourne
Registered:
May 2002
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Re: Air Bypass Valve
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Fri, 11 February 2005 10:19
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yes i think the water lines are to stop it icing up in cold climates!
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 10:26
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| wilbo666 wrote on Fri, 11 February 2005 16:48 |
doubt it will get too hot if it doesn't have water going through it, so I'd try it without water first and see how you go...
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Ummm, isn't the water the thing that closes it?
Ie, no water = open all the time, thus completely removing its purpose in life
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Location:
Melbourne
Registered:
May 2002
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Re: Air Bypass Valve
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Fri, 11 February 2005 10:29
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typicly thay are bolted to the engine to better judge when it is "warmed up" i'd say... hello retired toyota engineer somewhere care to explain??
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: Air Bypass Valve
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Fri, 11 February 2005 11:47
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On the 4AG, the air valve is on the bottom of the throttle body. If you see where the accelerator cable connects to the cam (on the side of the intake plenum )that opens and closes the throttle butterfly, have a look underneath it. There should be two thin radiator hoses that carry hot water through the bottom of the air intake mouth. If you look inside the intake mouth, you'll see a hole in the bottom through which extra air is sucked when the engine is cold. As the water heats up, it passes through the idle valve on the bottom of the intake and heats a wax pellet (like a thermostat). As it heats up, the mechanism closes and cuts off the extra air going into the engine. If the mechanism is blocked up, when the engine is warm one hose will be hot and the other cold. If it's working, both will get hot as the water passes through. When the engine is cold and running, block the hole with your finger and the revs should drop. Do it when the engine is hot and the idle shouldn't drop - or only by 100rpm or so - if the idle drops then your idle valve isn't working properly.
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Fri, 11 February 2005 12:55
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| Scorpion wrote on Fri, 11 February 2005 22:47 |
On the 4AG, the air valve is on the bottom of the throttle body. If you see where the accelerator cable connects to the cam (on the side of the intake plenum )that opens and closes the throttle butterfly, have a look underneath it. There should be two thin radiator hoses that carry hot water through the bottom of the air intake mouth. If you look inside the intake mouth, you'll see a hole in the bottom through which extra air is sucked when the engine is cold. As the water heats up, it passes through the idle valve on the bottom of the intake and heats a wax pellet (like a thermostat). As it heats up, the mechanism closes and cuts off the extra air going into the engine. If the mechanism is blocked up, when the engine is warm one hose will be hot and the other cold. If it's working, both will get hot as the water passes through. When the engine is cold and running, block the hole with your finger and the revs should drop. Do it when the engine is hot and the idle shouldn't drop - or only by 100rpm or so - if the idle drops then your idle valve isn't working properly.
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yeah I know this one, but the problem is my throttle body's piping have all been welded shut... so either I find a "bypass valve" or I find a RWD intake manifold, which I think the 1st item is easier to find...
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Location:
sydney
Registered:
March 2003
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Location:
Menai area of Sydney
Registered:
June 2003
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Location:
Brisbane
Registered:
May 2002
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Re: Air Bypass Valve
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Sat, 12 February 2005 09:10
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| CrUZsida wrote on Fri, 11 February 2005 21:26 |
| wilbo666 wrote on Fri, 11 February 2005 16:48 |
doubt it will get too hot if it doesn't have water going through it, so I'd try it without water first and see how you go...
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Ummm, isn't the water the thing that closes it?
Ie, no water = open all the time, thus completely removing its purpose in life
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Its a bimetalic strip dude, the reason it opens and closes is due to the 12v that goes to it heats it and causes it to bend, when you take the 12v away it cools and closes the valve again.
I can't imagine 80+ deg water doing a real good job of cooling it?
Cheers
Wilbo
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Sat, 12 February 2005 09:50
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| wilbo666 wrote on Sat, 12 February 2005 17:10 |
Its a bimetalic strip dude, the reason it opens and closes is due to the 12v that goes to it heats it and causes it to bend, when you take the 12v away it cools and closes the valve again.
I can't imagine 80+ deg water doing a real good job of cooling it?
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The way I see it, the water heats it up.
While the water it hot, there is no need for it to be open.
It opens once the water cools down again (ie, cold starts)
Once the water is warm, ie, engine is up to operating temps, the devices closes until the engine is cold again.
You said it yourself, its just ignition voltage and earth.
How can this control anything?
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Location:
Brisbane
Registered:
May 2002
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Re: Air Bypass Valve
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Sat, 12 February 2005 10:30
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| CrUZsida wrote on Sat, 12 February 2005 20:50 |
| wilbo666 wrote on Sat, 12 February 2005 17:10 |
Its a bimetalic strip dude, the reason it opens and closes is due to the 12v that goes to it heats it and causes it to bend, when you take the 12v away it cools and closes the valve again.
I can't imagine 80+ deg water doing a real good job of cooling it?
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The way I see it, the water heats it up.
While the water it hot, there is no need for it to be open.
It opens once the water cools down again (ie, cold starts)
Once the water is warm, ie, engine is up to operating temps, the devices closes until the engine is cold again.
You said it yourself, its just ignition voltage and earth.
How can this control anything?
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I have had an ABV (of the same design as above, in fact I'm pretty sure it was me that sent that pic to nark to put in the techdocs!) operating out of the car off a 12v power supply (I was checking to make sure that it worked, because I had previously had two that didn't work!). It opened/heated up fine (I think you would be surprised at how quickly the valve closes from a cold start...much quicker than your car heating up fully) without water lines attached 
Edit: I guess it might idle a little high on warm starts, but I don't think you would notice it much, why not try it without the water lines and decide if they need to be hooked up (save some work...)
Cheers
Wilbo
[Updated on: Sat, 12 February 2005 10:42]
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Air Bypass Valve
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Sat, 12 February 2005 10:37
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| wilbo666 wrote on Sat, 12 February 2005 18:30 |
I have had an ABV (of the same design as above, in fact I'm pretty sure it was me that sent that pic to nark to put in the techdocs!) operating out of the car off a 12v power supply (I was checking to make sure that it worked, because I had previously had two that didn't work!). It opened/heated up fine (I think you would be surprised at how quickly the valve closes from a cold start...much quicker than your car heating up fully) without water lines attached
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So, with what your suggesting, if I walked up to the cold car, and turned the key ON, and let it for 5-10mins accidently, then when to start it, that I now wouldnt have cold idle?
Seems pretty dumb thing to Toyota to do to me...
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Location:
Brisbane
Registered:
May 2002
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Re: Air Bypass Valve
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Sat, 12 February 2005 11:04
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| CrUZsida wrote on Sat, 12 February 2005 21:37 |
| wilbo666 wrote on Sat, 12 February 2005 18:30 |
I have had an ABV (of the same design as above, in fact I'm pretty sure it was me that sent that pic to nark to put in the techdocs!) operating out of the car off a 12v power supply (I was checking to make sure that it worked, because I had previously had two that didn't work!). It opened/heated up fine (I think you would be surprised at how quickly the valve closes from a cold start...much quicker than your car heating up fully) without water lines attached
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So, with what your suggesting, if I walked up to the cold car, and turned the key ON, and let it for 5-10mins accidently, then when to start it, that I now wouldnt have cold idle?
Seems pretty dumb thing to Toyota to do to me...
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Good point, but I had two apart and they would both close up with 12v alone.
Cheers
Wilbo
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Sat, 12 February 2005 14:51
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| Quote: |
Do you have any litle tubes sticking out of the top of your throttle body ? If so, one of them should give you increased idle speed when opened and you can vary the restriction to vary the revs.
If you haven't got any tubes open, you may hve to drill a hole as there is no point having a valve if you have nowhere to feed the air into the the plenum after the throttle butterfly valve.
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Scorpion: I can feed the cold air via the hole from the "cold start injector" coz I don't need that with after market computer right?
| CrUZsida wrote on Sat, 12 February 2005 21:37 |
So, with what your suggesting, if I walked up to the cold car, and turned the key ON, and let it for 5-10mins accidently, then when to start it, that I now wouldnt have cold idle?
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But as soon as the cold water circulates, it should open the valve for cold idle right?
but if there's hot water, the valve should still open a few seconds after the car starts...
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: Air Bypass Valve
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Sun, 13 February 2005 04:12
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Haven't had much to do with after market ECUs but I know some 4AGEs don't have them anyway so sounds like a reasonable option.
Need to experiment though because I'm not sure how the airflow will work - may only feed extra air into cylinders 1 & 2.
You could possibly take the air control valve off the bottom of the throttle body and feed your idle valve into the hole the ACV uses just behind the butterfly valve.
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Location:
Sydney
Registered:
August 2004
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: Air Bypass Valve
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Sun, 13 February 2005 11:53
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Correct. 
... and where does the main air flow come from ... one side. So I can't see the air from the idle jet hole going into cylinders 3 & 4 against the direction of the general air flow.
I'm not saying it won't, just that I think it is unlikely and could therefore give different mixtures to different cylinders. I'd do something around the throttle body but then this is not for my car.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Air Bypass Valve
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Sun, 13 February 2005 12:12
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wouldnt it just be easier to get another 4age TB and use the very simple cold start air bypass/idle down it uses?
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Sun, 13 February 2005 15:01
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| feral4mr2 wrote on Sun, 13 February 2005 23:12 |
wouldnt it just be easier to get another 4age TB and use the very simple cold start air bypass/idle down it uses?
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it would, but my throttle body is welded together with the intake manifold and therefore the only simple way is get the replacement rwd intake manifold which can range from $150-250 depends on your luck and the greed of the seller... And they're no always available...
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Correct.
... and where does the main air flow come from ... one side. So I can't see the air from the idle jet hole going into cylinders 3 & 4 against the direction of the general air flow.
I'm not saying it won't, just that I think it is unlikely and could therefore give different mixtures to different cylinders. I'd do something around the throttle body but then this is not for my car.
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I wasn't expecting the air flow to be big enough to make any difference @ idle?
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Location:
Gold Coast
Registered:
January 2003
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Re: Air Bypass Valve
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Sun, 13 February 2005 17:26
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Ok let me tell you about that bypass valve, you will require water to run through it for it to function properly. In the event you been for a run up the hwy, pull into servo go inside have a coffee come out 20mins later you car will still be hot but the bypass valve bimetal strip wont be so when you turn your car back on it will idle high until the bimetal warms up from the 12v wiring system.
If it has the water connected through it the bimetal strip stays warm and you will no experiance anything you shouldn't
Another way around your idle problem would be be to use an idle up solenoid system used in early toyota a/c systems. They are an adjustable air bypass. You could use your aux output from the microtech to switch it off at say 65 degress then you would be fine
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Location:
Melbourne
Registered:
May 2002
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Re: Air Bypass Valve
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Mon, 14 February 2005 00:23
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| BansheeBuzz wrote on Mon, 14 February 2005 04:26 |
Another way around your idle problem would be be to use an idle up solenoid system used in early toyota a/c systems. They are an adjustable air bypass. You could use your aux output from the microtech to switch it off at say 65 degress then you would be fine
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thats what i use, its nicely adjustable, looks factory and works well
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Location:
Sydney
Registered:
August 2004
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Re: Air Bypass Valve
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Wed, 16 February 2005 05:00
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| Allan wrote on Mon, 14 February 2005 11:23 |
thats what i use, its nicely adjustable, looks factory and works well
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How's that work? It's too blurry to see what's happening there...
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