Originally Posted by doverosx
..., people will move the goal post even further.
The first place to scoot it back to would be long term trim / memory. You can't just flash a tune and go. The calibration needs to get adjusted for by the ECU. So you can't just hurry up and make runs like shooting a movie scene during a sunset.
The proof is in the pudding, as far as tunes go. Did it improve drivability? Get rid of a power dip? Improve your 1/4 mile times? And whatever your metric, and this goes for any mod: did the change result in a consistent improvement over the pre-change data?
Originally Posted by klikai
Specially the 4WD dyno problem that nobody else have
they claim that the vehicle pulls power on a 4WD dyno where no one else has this issue
Before knowing there was any such debate, I had run my own 124 on a 2-wheel dyno (no tune at the time) and got reasonable results. A year later, I ran again, this time with an OFP calibration, again on a 2-wheel dyno, and got reasonable results. The second time, I made sure to capture video both inside and outside the car, including the dash, and thorough datalogging
. I haven't seen anyone post data showing what the ECU is doing to retract power delivery, and my own data didn't show anything that I could see happening (throttle position reduction, boost dump, etc.). Since I'll be installing this aFe turbo and other "power adder" items this year, I've found a more local shop with a dyno, and have time scheduled there. This way, when I get those items installed, I'll at least have the same dyno for pre and post mod runs. And of course my own driving circuit with data logging, too.