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Old 08-27-2019, 09:39 PM   #1
B19 Coupe
 
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Drives: 2018 Chevrolet Camaro 2SS 1LE 6M
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PCM pulling timing at 6k rpm

Having an interesting issue with my 2018 Camaro SS 1LE. Had the car tuned a couple of weeks ago and I have been sorting out a few issues. The part throttle was a little wonky and playing with the throttle tables smoothed out that problem. I am seeing a strange problem at full throttle. The PCM is pulling 10-15 degrees at around 6,000 RPM at full throttle. It's not knock retard. No matter if I am running 21 degrees or 25 degrees, the same thing occurs. The only mods on the car are a Soler Performance throttle body, a Green filter drop in air filter, and a flex fuel kit. The E85 that I am getting at the local pumps runs about 78-80% ethanol. I have attached a screen shot of the datalog right before the problem occurs, and one of the actual issue occurring. Ideas?
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Old 08-29-2019, 01:00 AM   #2
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Are you logging all the torque pids?
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Old 08-29-2019, 09:05 AM   #3
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That's a torque table issue. It'll pull timing if your max torque is over peak torque or if you eng torque is over max torque. It's not very fun to work with but I'd take it back to your tuner. They most likely didn't dial in your VE tables
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Old 08-29-2019, 12:26 PM   #4
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Thanks for the input. The torque limits were moved up by 25%. Not sure which torque PIDs would be helpful in diagnosing this issue. Could you be more specific?
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Old 09-09-2019, 12:43 AM   #5
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I finally figured it out. For some reason the PCM is seeing more than the estimated max value for the MAP sensor. Upping the value eliminated the problem.
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Old 09-11-2019, 03:24 PM   #6
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you shouldn't be over 100 unless you are running boost.
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Old 09-12-2019, 12:05 AM   #7
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The stock value for estimated MAP maximum is 105 kPa. Datalogs show that the maximum logged MAP value is 100 kPa. Not sure why the PCM is reacting to the MAP value the way it is, but moving the estimated MAP maximum up to 135 kPa eliminated the issue. I have attached a screen shot of a datalog I just pulled tonight, with a nice straight timing curve-no timing being pulled at 6k RPM.
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