[Supras] Power low after 4000 rpm

[Dave Henry]

The afm just measures flow, it doesn't care about pressure.  If you have a 
leak in the IC pipes, then what is happening is that the afm is measuring 
more air than is actually going in the engine, it is injecting fuel for the 
qty of air it's metering, but since less air is actually going into the 
engine (some of the metered air is leaking out), you are probably running 
very rich under boost.  It usually gets worse as you run more boost, as more 
boost will push the leak open more.

DaveH

----- Original Message ----- 
From: "jason estell" <metaphysico at hotmail.com>
To: <supras at supras.com>
Sent: Monday, September 24, 2007 2:12 PM
Subject: Re: [Supras] Power low after 4000 rpm


> Alright some people misunderstood, my na has a built motor the turbo is
> stock as of now.  My answer may have came to me last night.  So my new
> question is, is there a boost sensor or is it run by the maf projected 
> boost
> levels.  Just so it is know I had 6 psi boost and no power at 4000, 
> shimmed
> wg and peg guage now.  If the maf "guesses" what boost pressure would be
> then the lack of power makes sence, Problem I have is that it does not 
> smoke
> at all and is fine till then, I can hear the pressure excaping and know 
> that
> the leak is there but have 8+ psi which if there is a sensor in the intake
> it would directly mean toyota screwed up in design and engine cant comp. 
> i
> have not checked the car very well due to being very busy, but will check
> tomorrow while off, and im going to get some mandrel pipe to make intake.
> Also one other question while replacing 3000 pipe is there any problems 
> that
> arize from getting rid of the bottle neck in the pipe.
>
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