AA's DHP PowrTuner log

Here's a couple graphs comparing the 3.2" and 3.4". In the first graph (RPM vs. KR) the 3.2" shows more frequent knock, but it's below 3º and fairly short-lived (not severe, imo):



The resulting performance increase (Throttle % vs. MPH from the same run) is impressive:

Well you answered my question over here . Looks like the 3.2 isn't much more kr than the 3.4?

In this case it looks that way, but not really. the 3.4" run was without much of a tune (didn't need it until up high, really). The 3.2" took some dailing in. Before the tune I was running near stock MAFF values. KR popped up earlier, and sustained in the 3-5º range. I got a nasty peak of 6º last year at the track. Now it's under control it seems, at least at 40ºF, but no, we are not comparing apples to apples in terms of KR. I'll try to find a previous scan of the 3.2" so you can see how it was.

Well it got warmer, and 3.2" SC pulley doesn't like it very much. Tried tuning for 75F temps, but KR is back. I've got a 3.3" on the way. In the meantime, put the 3.4" back on and will try to tune it for the hotter weather.

Hope it cools down a bit for IDD this weekend.

AA wrote:

Well it got warmer, and 3.2" SC pulley doesn't like it very much. Tried tuning for 75F temps, but KR is back. I've got a 3.3" on the way. In the meantime, put the 3.4" back on and will try to tune it for the hotter weather.

Hope it cools down a bit for IDD this weekend.

get the I/C instead!

AA,
How come you stopped logging your progress at this point.?
Was just curious, have read through the thread and found it educational and informative even though I don't have any tuning software yet.

In your opinion, do think I should be on the lookout for used DHP or just wait until I can afford HPT.
Or should I plan a trip to Ohio and have you upload a tune in my car. j/k

I stopped adding to this thread when I stopped learning and experimenting with tuning the car. It became clear to me that trying to add more fuel in order to run a 3.2" SC pulley wasn't worth doing. Once I got the car on the dyno, I realized that trying to tune for zero KR is not as important as tuning for HP. Everything changed for me at this point, and I'm now happily running the 3.4" with roughly the same tune from '07.

I did change the shift program, which I have posted here:

https://rivperformance.editboard.com/series-ii-scans-tuning-pcm-f5/shift-points-t3619.htm?highlight=shift

As for tuning your car, I would be more than happy to hook up and give it a try. We could get close, but it really takes days or weeks to get everything dialed in perfect. If you are happy with "close", I could give it a shot.

Thanks, I would like to duplicate what you did with trans changes. It's obviously working for you.
Your able to get the performance you want, when you want it, and the higher gas mileage when you want it also.
I really can't wait to adjust the TCC settings, they have bothered me on every GM car I have owned.
Constantly tapping the brake pedal to disengage it so as not to lug the engine. The factory settings are not good for the best mileage in my opinion.

TCC and shift points are the easy part of tuning, because they depend less on you car's mods. MAFF tuning is a bit more involved, because you must scan, tune, scan, tune, etc...

I just need to learn and I'm looking forward to it actually.
Already have a good base of knowledge on how all is supposed to work, now I need to practice.

AA wrote:

As for tuning your car, I would be more than happy to hook up and give it a try. We could get close, but it really takes days or weeks to get everything dialed in perfect. If you are happy with "close", I could give it a shot.

Thanks very much for the offer but Derek is going to help me soon with some basic tuning. I only live about 50 mins. from him and he has various saved DHP files to try.

I came to the same conclusion. Tried and tried but no matter what I did I couldn't run that 3.2 without KR. The 3.4 no problem. We'll see how the new motor does (once it's running) with the Gen V and VS Cam with the 3.25 pulley that came pressed onto the Gen V. If I can run it without KR I'll keep the 3.25, if not I'm going to swap my MPS back on.