Helping my buddy out by trying to tune his turbo 2010 V6 Camaro @ 5-6psi. We are noticing an issue that as soon as you give it any throttle it seems like its hitting some type of torque management that brings it straight to -20 degrees of timing. There is no registered knock. Just does it anything you give it throttle.
also at WOT after 5000rpm it always drops lean no matter what. Not following commanded AFR either.
Curious if anyone has run into this or knows what to try. I know tables are very limited with these V6 ECUs so this is our last effort to see what can be done for it.
The reason for the big negative drop in timing when you get into the throttle is going to be because of your Optimum Torque table adjustments that you made.
I met a same problem ,at WOT after 5000rpm it always drops lean. I try to increase Fuel Rail Pressure to 15Mpa. The strange thing is Injector pulse width drop to 3.8ms. seems like some functions limit the injection.
You will have to rescale all the Main Spark Tables once you change the Load Axis values. The screenshots is a example using a stock timing table. That way you can have better control of timing during before boost and while in boost.
Give that stuff a try to see if it helps any.
Do you have a wideband on the car to measure AFR?
And how much boost are you running?
Before this Tun04 Version,I have tuned a tun02 Version . In that version, i tuned the Axis ,it has a some problem.
The boost running 5.8PSI at 6000RPM.
I have a AEM wideband AFR meter. the meter display AFR 11.8 at full load, and it will drop to lean at 5000RPM (15AFR@5000RPM 16.8AFR@6000RPM)
In tun02 version ,I use 76mm MAF pipe. i seen the MAF will rach the max@5300 RPM. But the lean happen @ 5000.
In tun04 version, I changed the MAF pipe to 83mm, and increase Fuel Rail Pressure to 15Mpa, the lean still happen @5000. So, i think the lean and MAF are irrelevant.
Well did you recalibrate the MAF Calibration table when you changed the piping?
11.8 afr is pretty rich for these direct injection engines. I would command a max of .84, that would be around 12.35 afr. That is even pretty rich for direct injection. But it is a good safe starting point. For you to dial timing in.
Fuel rail pressure increase is a good idea. Make sure you do monitor rail pressure to see if pressure drops as boost comes in. You should be completely fine tho with that low of boost.
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Originally Posted by Mark@TuckerPerformance
