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Brake Torquing and Idle issues

mini zilo

Proven Member
783
9
Jul 17, 2006
Chicago, Illinois
When I brake torque up to about 3000 RPMs, if I let off the gas, the cars idle drops extremely low and the car almost dies. Is this normal? I thought it was due to a boost leak but I fixed it and it still happens. When I brake torque normal and just let the brake go, it all works fine. But if I stall up, and then release the gas, the car drops down to around 400 RPMs.


Is this normal??
 

mini zilo

Proven Member
783
9
Jul 17, 2006
Chicago, Illinois
Here is a video of mine when it does. You guys tell me if the same thing happens.


<embed width="448" height="361" type="application/x-shockwave-flash" wmode="transparent" src="http://vid97.photobucket.com/player.swf?file=http://vid97.photobucket.com/albums/l229/dmc0162/MVI_8609.flv"></embed>
 

kiggly

Supporting Vendor
315
157
Feb 17, 2003
Ann Arbor, Michigan
This is normal. It is because the factory ECU uses an airmeter that experiences reverse flows when you let off the throttle. The intake tract and intercooler system has to depressurize as you let off the gas. Some air flows backwards out the airmeter, some gets consumed by the motor. The ECU has no idea how much air is actually going into the motor at this point. Mitsu added in their 'airmeter reset' line on 1g's to hack around this deficiency. It pretty much just puts fuel in for an approximate idling condition when that function is activated (when you lift throttle like this).

This problem is intrinsic to any draw through airmeter setup. I honestly have no idea how it could pass emissions like this. You will see the same thing happen when you go from WOT to mid throttle.

Kevin
 

oldman

DSM Wiseman
9,797
190
Jun 21, 2003
Dayton, New_Jersey
Did you stall out trying to do a BOV salute to impress some chick? :D :tease:

Kevin, congrats on the 9.096. :thumb: Let's see that 8sec slip soon.
 

oldman

DSM Wiseman
9,797
190
Jun 21, 2003
Dayton, New_Jersey
I tried to do a BOV salute with my AT 95' on my driveway after reading this thread just to see what happens, car died. :D
 
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