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Location:
UK
Registered:
May 2002
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1JZ manifld pressure thingy...
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Wed, 12 March 2003 19:07
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I eventually got round to plumbing my boost gauge in again today (seeing as the last place i put it wasnt safe enough to hold the pipe on, and resulted in me blowing off the hose to the MAP sensor at full boost.. not good).
Anyway, look at the pic below.. its my new piece i've used to plumg the gauge in,
by the way, it screws into the inlet manifold, you cant see from the pic, and feeds the pipe to the MAP sensor (the bit to the left), and now also my boost gauge line (thats the orangey bit with the pipe in it at the top).
Now, below is the old bit (pic below). But this is confusing me a bit..
The old bit (which just fed the pipe to the MAP sensor) is a funny shape, and it isnt a straight through hole from one side to the other.. it appears to follow a route inside the part, perhaps going through some filter or something to straighten/restrict the air flow...
now, my new bit obviously doesnt do this (air in - air out)and i'm wondering if it will cause any probs to the MAP sensor.
I cant fit the adapter *and* the original air bit on as there isnt enough room..
Anyone know if the stock piece is designed to tamper with the air flow in some way? Does anyone know what it does to the air flow?
Cheers
adi
[Updated on: Wed, 12 March 2003 19:09]
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Location:
Sydney
Registered:
May 2002
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Re: 1JZ manifld pressure thingy...
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Thu, 13 March 2003 10:45
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Adi
EPCD lists it as a gas filter.
Not sure of it's exact function though.
Isn't it advisable not to tap into the plumbing for the MAP sensor and Fuel Pressure regulator? It's what Ive been told - don't know how true it is.
Regards
Manny
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Location:
newcastle
Registered:
June 2002
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Re: 1JZ manifld pressure thingy...
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Thu, 13 March 2003 11:39
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i would NOT use this setup if i where you effectively what you have done is add a bigger volume to the map sensor pressure line this could create a slight delay in the map sensor pressure signal .it MIGHT create a lean situation
I realise the volume is minimal but in engines milliseconds matter .also gauges CAN leak a little this would effectively bleed air from the map line
the filter was there for a reason to prevent the map becoming clogged with oil and condensation and alike .
simply tee any vacuum line other than the map line .and keep boost below 15 psi
easiest way to fit boost gauge fit a small tee pice add a short length of vacuum hose .slide the boost line inside the vacuum hose and fit a cable tie around it add a dob of super glue (where the hoses join) 2 min job
half the factory hoses are fitted using an adhesive and no clamp
just a side note cable tie evry single vacuum hose on a 1j EXCEPT the map that way if for some silly reason you overboost it pops the map line and the engine runs full rich
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Location:
UK
Registered:
May 2002
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Re: 1JZ manifld pressure thingy...
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Thu, 13 March 2003 12:28
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I thought the drop in pressure to the MAP sensor would be so small it wouldnt make a difference? I suppose youre right though , better safe than sorry.
Are *all* the hoses that come off the inlet manifold related to pressure then? Could i tap into any of them?
I've tried loads of things to keep the nylon tubing attached to vacuum hose, and none of them work. I dont really want to run the risk of it blowing off again so im still going to use the above connector, but perhaps on another line as you say.
Anybody know which one? got a piccie you can point to?
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Location:
newcastle
Registered:
June 2002
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Re: 1JZ manifld pressure thingy...
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Thu, 13 March 2003 12:35
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anything after the throttle body is fine . have run 25 psi with the above setup for boost gauge it has NEVER failed on dozens of cars one had intake temps of 100 degrees celcius(WHAT A KNOB) and even he didnt blow one .
it would take longer to type your post than actually do it
the most important thing is to get the filter back in
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Location:
UK
Registered:
May 2002
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Re: 1JZ manifld pressure thingy...
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Thu, 13 March 2003 12:57
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okay point taken.. I'll sort it out today..
cheers
adi
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: 1JZ manifld pressure thingy...
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Sun, 16 March 2003 13:20
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Begging your pardon celicamad, but if you overboost and pop the hose to the MAP, won't you run *lean* ?
The engine will be getting heaps of boost, but the ECU will only recognise atmospheric pressure.
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Location:
Gold Coast
Registered:
May 2002
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Re: 1JZ manifld pressure thingy...
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Mon, 17 March 2003 03:57
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It is my understanding that is the line does come off the map sensor the computer sees that you are at WOT so it will goto limp home mode and run pig rich.
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