by snake2332 - n00b » Fri Mar 21, 2008 5:53 am
I took off the turbo heat shield and shortened the wastegate arm 2.5 rotations. The boost levels seemed the same. I should have data logged it before doing this, but I didn't. Anyway, I logged it after shortening the arm. I attached the results of my data log. I'm not sure how useful it will be.
When I floor it in 4th gear at about 3000 RPMs, my Autometer boost gauge goes up to about 16psi then backs off to 10 psi then goes back to around 13 psi. Enginuity data logger shows max "target" boost of 11.62psi and stays at 11.62 psi while my boost gauge goes from 16 to 13 psi. When my boost gauge shows a solid 13psi, data logger shows 11.62psi. When I floor it in 2nd gear, my gauge hit about 17-18 psi and did the whole "back off to 10 psi, the back up to 14psi", however, the data logger still shows 11.62 as the max target boost level.
It seems like the target boost should be ~13psi with 100% throttle (13.63psi minus atmospheric compensation of about 5%). So the ECU has no sensor or reading for the actual current boost level, right?
The CEL is supposed to come on somewhere around 15.8psi at 13.20 atmospheric pressure, and my boost gauge is showing me exceeding that and yet no CEL light or fuel cut. Maybe because of the delay setting in the ECU? It says "boost limit CEL delay" set to 31...31 what? I don't know, it just says raw ecu value. Milliseconds perhaps?
The wastegate duty cycle maxed out at 82.75%, not sure if that's good or not. In the ECU I see 18.8% compensation and 96.1% for max wastegate duty cycle.
What the hell is going on with my turbo? Is there other info I should log and should I do it at higher RPMs, or should I start the log at like 3000rpm in 3rd gear then floor it and stop the log when I hit redline?
Thanks for any help you guys provide.
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- ECU log - Troubleshooting overboost.jpg (77.37 KiB) Viewed 12014 times