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Matt20v
Regular


Location:
Richmond NSW
Registered:
September 2003
 
How to Check VVT Wed, 13 July 2005 10:37 Go to next message
Hi Everyone

As you may or may not know I own a 20v Blacktop

But after putting my car on the dyno I am not sure if my VVT is kicking in properly or at all.

When I drive the car I think I feel it kick in but then it could just be me making it up.

So I was wondering is there any real way to check if my VVT is kicking in and doing the right thing!!

Cheers for any information that anyone can give all will be very much appreciated.


Cheers Matt

If you wanna see the Dyno Sheet let me know.

[Updated on: Wed, 13 July 2005 10:37]

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HyDrA
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Adelaide, SA
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May 2002
 
Re: How to Check VVT Wed, 13 July 2005 10:43 Go to previous messageGo to next message
You could try disconnecting the VVT plug and see if there is a difference...
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Matt20v
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Richmond NSW
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Re: How to Check VVT Wed, 13 July 2005 10:48 Go to previous messageGo to next message
i have done it before and i think it seems to be diffrent but couldnt be a 100% sure
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EvilJack
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Re: How to Check VVT Wed, 13 July 2005 12:07 Go to previous messageGo to next message
checked for any error codes?
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CrUZsida
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Re: How to Check VVT Wed, 13 July 2005 12:45 Go to previous messageGo to next message
Aftermarket ecu or factory?
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sideshow
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sydney
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March 2003
Re: How to Check VVT Wed, 13 July 2005 12:59 Go to previous messageGo to next message
they rev so hi its hard to check if its actually working

i have seen a 20v on an ems and it made bugger all hp difference with vvt on or off


best way to check it is get an injector noid light and plug it into the vvt plug on the loom

then free rev the engine and the noid light should come on
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tobyoste
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February 2004
Re: How to Check VVT Wed, 13 July 2005 21:40 Go to previous messageGo to next message
I believe the blacktop VVT is a bit different to the silvertop (silvertop just pulls the VVT on where I believe the blacktop controls the amount of variable timing depending on engine conditions.

With my silvertop, the ECU pulls the pin connecting the wire from the VVT valve to ground when the VVT needs to kick in. There is also a 12v feed to the other pin on the VVT valve.

Therefore, to see when my VVT kicked in, I connected an LED (with a resistor in series) to the same pin on the VVT pin on the ECU with the other end of the LED connected to 12v(i.e. 12v - LED - current limiting resistor - ECU VVT pin). When the ECU pulls the VVT pin to ground, power goes through the VVT valve and my LED indicating light showing when it goes on.

Now, this only tells you when the ECU is telling the VVT valve to work. I also put a toggle switch between one of the wires to the VVT valve and the VVT valve so I could switch the valve off after the ECU had told it to switch in and feel if it made much difference. You certainly could feel the difference but it was MUCH less significant than I thought it would be. I did this some time ago but I seem to remember it to have a similar to (though slightly more than) the effect you get from turning the Air Con on.

I hope this is of some help.

Toby
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Alchemist
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Re: How to Check VVT Thu, 14 July 2005 00:16 Go to previous messageGo to next message
Your dyno sheet should show a significant rise in power when VVT kicks in. At the last Toymods Dyno day all those with the 2ZZ-GE's with VVT had a very very noticeable rise in power in the higher rev range(I think 6000RPM +). I could try to get a copy of my mates 2ZZ dyno sheet if it'd be any help?
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CrUZsida
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Re: How to Check VVT Thu, 14 July 2005 00:37 Go to previous messageGo to next message
tobyoste wrote on Thu, 14 July 2005 05:40

I believe the blacktop VVT is a bit different to the silvertop (silvertop just pulls the VVT on where I believe the blacktop controls the amount of variable timing depending on engine conditions.

So you are saying that the silvertop is VVT while the blacktop is VVTi ?
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HyDrA
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Re: How to Check VVT Thu, 14 July 2005 01:06 Go to previous messageGo to next message
Doesn't that also depend on the revision of the silvertop... the early silvertops just switch it on at 4500rpm or whatever, but the later ones compensate for conditions.
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tobyoste
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February 2004
Re: How to Check VVT Thu, 14 July 2005 01:34 Go to previous messageGo to next message
Sorry for some misinformation. I just checked the blacktop manual to see if its ECU has a camshaft position sensor input (needed for VVTi) and it hasn't so it must be just VVT not VVTi as I earlier stated.

BTW, my silvertop activated the VVT on the basis of throttle position only (once the engine was warm). The LED would even flash briefly when you blip the throttle during downshifts (although I don't know if the mechanism would actually be able to advance the camshaft and back again for such a short time).

Toby
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Ben Wilson
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Canberra
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May 2002
Re: How to Check VVT Thu, 14 July 2005 01:44 Go to previous messageGo to next message
When I was checking to see if my Haltech was actuating the VVT on my silvertop properly, I just pulled the timing cover off and marked the pully (inner and outer) with a texta, then, I hooked up a timing light to the coil lead and gave it good rev with the light pointed at the pulley. It was pretty easy to see that it was working.
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Matt20v
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Location:
Richmond NSW
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September 2003
 
Re: How to Check VVT Thu, 14 July 2005 03:30 Go to previous messageGo to next message
Thanks heaps for everyones input.

ECU is standard

I always thought that Blacktops had VVTi and Silver VVT as well
Cause then in the new ones its VVTLI

But then may be wrong.

Anyway, I will definitely try the diode thing because I have one of them at home and prob try the timing one as well.


http://www.totalrpm.com/carimages/Matt20v-IPG1.jpg

This is my dyno run now dont laugh.....

But see mine just doesnt spike like I thought it would.

Anyway tobyoste your right when I disconnected my VVT from the engine I thought I would really notice it but then I don’t think I really felt a huge difference like I expected so..

I dont no but thanks for any info people.


Also no error codes

[Updated on: Thu, 14 July 2005 03:31]

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CrUZsida
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Re: How to Check VVT Thu, 14 July 2005 03:36 Go to previous messageGo to next message
You need to get a cold air intake dude.
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Matt20v
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Location:
Richmond NSW
Registered:
September 2003
 
Re: How to Check VVT Thu, 14 July 2005 03:43 Go to previous messageGo to next message
i DO it sits in the front bumper..

Got any other ideas

this is how i have it set up

http://forums.toymods.org.au/index.php?t=msg&t h=21765&prevloaded=1&rid=3675&S=dbc017 06ce3edf1e1a9a1585c178ca56&rev=&reveal=&am p;start=0&count=40
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EvilJack
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Re: How to Check VVT Thu, 14 July 2005 03:55 Go to previous messageGo to next message
Quote:

The vvt on both the black and silver is the same Mechanism. VVTI has the same features as vvt, but also has the ability to change lift and duration. The only toyota engine that has this is the 2zzge


from club4ag
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CrUZsida
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Re: How to Check VVT Thu, 14 July 2005 03:56 Go to previous messageGo to next message
Well, the dyno operator must be silly then.

Coz when that dyno was done, the ambient temp was 14degC, and your intake temps were 37degC.

If it was a proper cold air feed, and the temp probe was in the correct place, the intake temps would be within 10deg max of the ambients.
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CrUZsida
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Re: How to Check VVT Thu, 14 July 2005 04:08 Go to previous messageGo to next message
EvilJack wrote on Thu, 14 July 2005 11:55

Quote:

The vvt on both the black and silver is the same Mechanism. VVTI has the same features as vvt, but also has the ability to change lift and duration. The only toyota engine that has this is the 2zzge


from club4ag

Its bullshit.

VVTi cannot change lift, only duration.

VVT is ON/OFF
VVTi is variable.
VVTLi is lift aswell (The 2zzge is correct)



EDIT: By bullshit I am not referring to the first sentence, just the 2nd.

[Updated on: Thu, 14 July 2005 04:09]

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sideshow
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Location:
sydney
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Re: How to Check VVT Thu, 14 July 2005 07:52 Go to previous messageGo to next message
black top and silver top ecus are to stupid to do variable cam timing

it is either on or off on the cam timing
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Matt20v
Regular


Location:
Richmond NSW
Registered:
September 2003
 
Re: How to Check VVT Thu, 14 July 2005 10:24 Go to previous message
Cool well thats sorts that.

Has anyone every heard about the vvt cam gear ???

i am shure someone mentioned it before saying that they often break but i aint sure what it is ?
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