madprof01
April 24th, 2006, 04:32 PM
This is a 00 c5 with AFR heads and a mild cam. The people who installed the parts gave the car back wiht crappy idle quality, and he said mi-range Rpm didn't seem to be strong enough.
He brought it to us on one of our dyno days and the car made 405 hp and 413 ftlbs. (tought it was a z06!) He decided to have us check out his idle before race season after he saw that we used EFILive and not LS1 edit. I worked with it for a while and got it to idle and not surge except a small amount when cold and definately not stall at all. I the n went on to the VE table and cleaned up what looked like an EKG readout. Timing wasn't too far off but it was blocked out as RPM increased instead of being a smooth increase. When I was done it made 438 hp and 446 ftlbs. overall the customer was happy. He did return acouple days before his first race and wanted the idle lowered so it would lope. I warned him it hunt more and not seem quite so smooth in drivebility. From Texas I get a call, The car will not idle but is awesome off idle, he was very happy with the results of his racees nad come back in after he had returned. It idles now he said everything semms fine after returning to altitude.
The question is, Why would the car idle at 5000 ft and not at sea level? Doesn't the PCM compensate for the change in altitude? What can I do to fix this?
Thanks in advance,
madprof01
He brought it to us on one of our dyno days and the car made 405 hp and 413 ftlbs. (tought it was a z06!) He decided to have us check out his idle before race season after he saw that we used EFILive and not LS1 edit. I worked with it for a while and got it to idle and not surge except a small amount when cold and definately not stall at all. I the n went on to the VE table and cleaned up what looked like an EKG readout. Timing wasn't too far off but it was blocked out as RPM increased instead of being a smooth increase. When I was done it made 438 hp and 446 ftlbs. overall the customer was happy. He did return acouple days before his first race and wanted the idle lowered so it would lope. I warned him it hunt more and not seem quite so smooth in drivebility. From Texas I get a call, The car will not idle but is awesome off idle, he was very happy with the results of his racees nad come back in after he had returned. It idles now he said everything semms fine after returning to altitude.
The question is, Why would the car idle at 5000 ft and not at sea level? Doesn't the PCM compensate for the change in altitude? What can I do to fix this?
Thanks in advance,
madprof01