G-loading hesitation?
03-03-2003, 10:40 AM
#1
Racer
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Join Date: Jul 2001
Location: Montreal, QC, Canada
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G-loading hesitation?
Since it's still freakin' -25C up here in the GWN, figure I'd try to solve some issues that showed up late last year...
Car is a near stock 55K turboS, M030 running P-Zero C's...
Immediately after some heavy G-loading my TurboS experiences what I would best call a brief moment of hesitation in power delivery. Power after that is linear and substantial.
Problem is most pronounced after instantaneous high-G's... (i.e. carosuel at Mt. Tremblant, 5b at Mosport)
Symptom occurs at full throttle, relatively low-medium RPM, 2nd/3rd gear. Lasts a split second (although it seems like eternity on track).
Otherwise car works very well, no other issues.
It's pretty consistant, will occur lap after lap.
Motor is tight and original(stock boost), recent full tune up/excellent compression numbers/Zero oil usage.
Some people are suggesting temporary fuel starvation causing knock detection ignition retard. Problem occurs with low fuel level and full fuel. Other Turbo's I've driven do not exhibit this condition.
Any suggestions?
Car is a near stock 55K turboS, M030 running P-Zero C's...
Immediately after some heavy G-loading my TurboS experiences what I would best call a brief moment of hesitation in power delivery. Power after that is linear and substantial.
Problem is most pronounced after instantaneous high-G's... (i.e. carosuel at Mt. Tremblant, 5b at Mosport)
Symptom occurs at full throttle, relatively low-medium RPM, 2nd/3rd gear. Lasts a split second (although it seems like eternity on track).
Otherwise car works very well, no other issues.
It's pretty consistant, will occur lap after lap.
Motor is tight and original(stock boost), recent full tune up/excellent compression numbers/Zero oil usage.
Some people are suggesting temporary fuel starvation causing knock detection ignition retard. Problem occurs with low fuel level and full fuel. Other Turbo's I've driven do not exhibit this condition.
Any suggestions?
03-06-2003, 04:02 PM
#2
Race Director
Is there a difference between left & right corners at high-G? Only thing I can think of right now is the cornering force interferes with the flapper-door in the AFM; moving it to a position that's not indicative of your airflow at the moment. This hesitation could then be a rich or lean mixture depending upon which direction the flapper-door was jarred?
