[Biturbos4] Speaking of MAF's

[Quincy Chiang]

Hi Mike,

Congrats on your new car!  Your car is not chipped, stock boost is around 0.7 - 0.8 bar.  Bosch and Hitachi systems are not interchangeable, your '01 should be have the later Hitachi system that is supposedly more reliable.

But you mention you have a F-hose in your car?  AFAIK that's only in pre-'01 cars, as the later ones got rid of it.  This means yours might be built during the transition period and have the pre-updated hardware along with the Bosch MAF.

Quincy

----- Original Message -----
From: mike mcclurg <rrrrraudi at yahoo.com>
Date: Monday, May 23, 2005 11:55 am
Subject: Re: [Biturbos4] Speaking of MAF's

> So the MAF was not a 2001.5 thing?
> 
> I guess I knew about the 1.7 bar meaning 1.7 times
> atmospheric. I should have asked whether 0.7 is normal
> for an unchipped car? I was on a flat road in Kansas.
> Atmospheric was 960mm.
> 
> Thanks,
> Mike
> 
> --- dap128 <dap128 at hotmail.com> wrote:
> > Only the 2000 S4s had Bosch MAFs (at least in the
> > US).  2001 and later all 
> > had Hitachi MAFs.
> > 
> > The stock pressure sensor reads in abolute bar so it
> > reads the ~1 bar 
> > atmospheric pressure plus your boost pressure.  That
> > means your car is 
> > running 0.7 bar of boost (assuming you are at sea
> > level where atmospheric 
> > pressure is approx. 1 bar).
> > 
> > -Dave Pramanik
> 
> 
> 
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