[s-cars] Flames, good or bad?

[Theodore Chen]

spitting flames is something you usually see on carburetor cars,
during a rapid transition from WOT to closed throttle.  at WOT, fuel
starts to collect on the insides of the intake, and when the throttle 
is snapped shut, the pressure drops and the fuel goes back into vapor.
the rich condition results in flames.

i'd guess that in this case, you have a long intake tract that might've
been made longer by the FMIC.  the MAF is pretty far away from the
throttle, and when you snap the throttle shut, the engine management
system is still metering fuel for the greater volume of air that it
sees moving past the MAF.

i suspect changing the setup so that the turbo blows through the MAF
would help.

spitting flames probably isn't too good for the catalytic converters.

-teddy

--- mlp qwest <mlped at qwest.net> wrote:
> So this would be flames on massive deceleration, a suddenly closed throttle
> plate?
> I guess now on re-reading, and paying better attention to Elijah's "..on
> shifting..."
> that makes more sense that one could/would generate a lot of unburned gas
> pushing through the cylinders coming off the throttle
> 
> Sorry Elijah.  I guess the next step is to now figure out a way to measure
> who's flames the longest?  :-)
> 
> Mike
> 
> ~-----Original Message-----
> ~From: Trevor Frank [mailto:tfrank at symyx.com]
> ~Sent: Thursday, January 15, 2004 4:10 PM
> ~To: mlped at qwest.net; Elijahallen92 at aol.com; s-car-list at audifans.com
> ~Subject: RE: [s-cars] Flames, good or bad?
> ~
> ~
> ~
> ~At the track many of the urs4 have flames coming out the back, I always
> ~though it was some issue with too much fuel at or near idle i.e. too
> ~rich.  But who knows.
> ~
> ~I saw brains, haps and I think even chris leals car coming into turn 11,
> ~a hairpin from a high speed strait shooting flames out the back.
> ~
> 
> 
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