My car seemed like it was down on power so I collected some data from a 3rd gear pull, however I'm not exactly sure how to interpret it. The one things that jumps out to me is the retarded timing that occurs around 3300-3400 rpm, but I have no idea why. Can somebody help make sense of this data? Also, are their other data points that would be more valuable in assessing the issue? Any help greatly appreciated. Thank you!

 

Looks like the typical flashed car peak torque pump gas timing pull. Tune is probably a bit aggressive there for your gas, what octane? Timing is fine after peak torque.


Boost tapers some up top, run a pressure check to 20 psi every time you touch a clamp.


AFRs look pretty normal, if a touch fat.


MAF in kg/hr would help but a tuner should be able to correlate voltages to mass air flow -you can get an idea if there's a leak if MAF is high but boost is low.


Much better than your previous logs, but not quite there.

 

Thanks for the help, I plan on going to the track tonight and running on 100 unleaded so I'll log some more data. I'll add MAF to the data as well. Thanks again!