[s-cars] An interesting FMIC "fact" (?)

[Kirby Smith]

Very interesting, Ned.  Thanks!

kirby


Ned Ritchie wrote:
> 
> Really big & giant intercoolers indeed create a lag created by volume.
> 
> Some of us depending upon the situation. . .  Like desiring to keep
> boost up will not use a by-pass valve relying upon the volume of the
> intercooler to do two things:
> 
> Act as an accumulator to absorb the pressure spikes
> Not have to be pumped up again after the pressure is relieved.
> 
> The "constant air" system on the S1 kept the throttle partially open to
> maintain 4000 rpm retarded the timing lots, and by-passed excessive
> boost during shifts into the exhaust manifold.
> 
> Lots of flame, popping, & explosions, but no lag.
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Kirby Smith
> Sent: Saturday, February 28, 2004 11:42 AM
> Cc: s-car-list at audifans.com
> Subject: Re: [s-cars] An interesting FMIC "fact" (?)
> 
> This discussion raises a question that the chip reprogrammers might be
> able to answer: Is there an intake flow time constant accounted for in
> the ECU code?  Specifically, with a giant intercooler, there will be
> more lag between the mass flow at the intake manifold and mass flow at
> the MAF sensor than with the stock IC.  Perhaps it sufficient to measure
> the rate of change of throttle opening and adjust fuel flow
> accordingly.  If I ever am able to upgrade my IC, I would prefer not
> have a new "feature" of lean spots in the engine response.
> 
> kirby
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list