The runs are done at full throttle so logging extrapolated MAF may not really be overwhelmingly helpful. The same full throttle runs in the same place in the same geographic location should be reasonable enough not to assume it is causing 8 degrees of timing pulls on a consistent basis. Its not like when you lift going from WOT to part throttle and everything changes massively. Keep in mind the e85 fixed it and the tuner recommended the new map with less timing request so thats taken care of. I dont disregard your suggestion though and appreciate it but I think its probably not necessary. The poster is log crazy though and probably would be glad to graph those variables. Obviously his own tuner didnt find it completely necessary.
The N is not 3 by the way. It is much more than 3.
Drob. I got it. Your exhaust was causing ghost knock for 10 months. Nothing else helped the timing retard. I’m not suggesting that NVH cant be an issue. Ok. Its not likely the entire thing that helped you, thats all.
Again, this is tuning 101. The posts that you point out HELPED THE GUY and his own tuner AGREED with the assessment. I’ve posted that about 4 times now and everyone seems to completely ignore that. Drob it doesnt matter what was wrong with your car when it comes to just looking at the logs. Again, whatever was wrong with it had you pulling to much timing. When a car is pulling to much timing it is attempting to run MORE TIMING THAN THAT CAR CAN HANDLE in that state of tune or repair and the ECU will OVERCOMPENSATE and pull more timing that needed.
You know what normal people do? They load or calibrate a map that runs a new timing profile that results in 4 or 5 degrees of timing pull and then start troubleshooting (checking for fuel quality issues, NVH issues (motor mounts/drivetrain/exhaust/etc, etc), start logging ECT and IAT temps (as there are direct tables that target these temps and affect timing), etc, etc, etc.
Then what do normal people in tuning do? They start addressing the issues they find and they start upping the timing slowly as they find each successful mod to their car (whether it be a repair, adding octane or meth, add an improved part, etc). They then run logs and do performance runs and see if it works. They then keep trying to find improvements and repeat the process of logging and performance testing. Thats called modding/tuning. I’m pretty sure thats what everyone here does as they add parts to their car or perform a performance improving maintenance. They make the change, log, and hopefully try and make corresponding changes to their engine management to take advantage of those changes/improvements in vehicle hardware or fuel quality (again whether that be a hardware fix or a hardware improvement).
Im pretty sure that what the suggestion was to the poster in the thread you linked and changing that one variable for him (octane) solved the problem as his tuner suggested. Now he could try other heat mitigation strategies on the 91 octane program (that his tuner recommended) until his car may be able to run the 93 octane program again (if he cares to add performance enhancing parts to run the higher timing). Again it is trivial to call it a “93 octane” program. It is a program that was timed well for that original tuner, on their car, in their geographic location, with their fuel quality/octane and with their mods and state of repair of the car. It works well with most other people with similar setups as the ECU is relatively adaptive at pulling timing but obviously there are some issues that necessitate loading another map until further changes are made to allow upping the map again
If you want to talk more about this I will be in Northville next month. I go up every few months as I grew up in Grosse Pointe. I’d be happy to meet up like gentleman and talk and run logs if you are up for that. I’m guessing you act much different in person.
mike
