MAP sensor take off
Turbo Mini Forums

Ive been struggling to get a vacuum reading for my ecu and I took the TB off today to have a look it is definitely plumbed in right and this is what I found..



Should I block that hole off that goes through and bypasses the butterfly. The only function I can see it having is so you can have the throttle fully closed and the engine keep running. Could this be the cause of lack of vacuum reading?

Cheers
Matt

Edited by matty on 9th May, 2008.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Now with pic..lol

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1/4mile in 13.2sec @ 111 terminal on 15psi

if you have a hole that bypasses the butterfly I think that is used for an idle speed control valve. I'm guessing you won't be using one of these so my guess would be to block it off. :)

I can't see any harm in blocking it up I could just set the stop on the butterfly to leave it open a tad to compensate for it?

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1/4mile in 13.2sec @ 111 terminal on 15psi

My TB closes completely and has a similar port from an idle adjustment screw. So I would not blank it off.

Can you get an idle take off from your plenum instead?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I possibly could with a bit of welding and drilling.

Would it make much difference having the take off in the plenum instead of the TB?

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1/4mile in 13.2sec @ 111 terminal on 15psi

IIRC, they reason jims wouldnt idle that well to start is because TD tigged that up TD?

i think that setting the stop shouldnt be a problem, just this is a neater way of doing it.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Yeah I believe the firing order is 1243 as ive just found out last week! Lol

Thats what confused me, I would of thought I would get some kind of vacuum even with that drilling.

Next job this weekend is double check valve clearances and cam timing.

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1/4mile in 13.2sec @ 111 terminal on 15psi