Been working on a new 93oct. pump gas tune. My original tune was at 22.5 PSI vs. my not yet completed 26.5 PSI tune. Peak timing was 19 on the lower boost and 13 peak timing on the 26.5 PSI tune. Here are some results



Gonna try to up the timing a bit more, but its already mre than i thought i could get away with. My best trap with my original tune was 117, so it should pickup a little with the new tune. Not too shabby for a self tune

Looks like you might need to tweak the RPM trim in the virtual dyno. Anytime the curve jumps up like that, it's usually the averaging that is doing it. Try a few different trims until it looks a bit better. Your peak HP on the higher boost run is probably closer to the original run.

They are both on the default trim so it should be relative I would think

The MAX RPM TRIM all depends on the datalog file and how the last few lines of data happened to fall between the rpm points. Because of the way that the math is setup to average out the data, sometimes you need to choose a different max rpm value to end at to math the irregularity go away. For best results, start with the highest RPM value that shows up in the MAX RPM TRIM dropdown list and if there seems to be an unusual shaping at the end of the power curve, keep dropping the max rpm value by 50 rpm until you see a more 'realistic' curve. You usually never need to trim more than 250 rpm to remove any irregularities that may pop up. If it doesn't seem to change shape after 250 rpm of trimming, its most like a legit power curve. Eventually I'll figure out a way to remove this anomaly from the calculations but for now the trimming works. Nice increase in torque

Understood, thanks JOT!

I'm a little surprised at the mild gains for a 4 psi increase in boost. Is that the best timing you could get at 26.5 psi?

Not sure. I started the tune yesterday and did like 12 pulls to get that far. The thing with running more boost and less timing is you will not get all the power you would normally get with say race gas on the same increase in boost. Its still a work in progress as I could not get any more done last night. The neighbors were starting to give me dirty looks

I could use some input as to what others are running for timing with higher boost on pump.

I learned a log time ago that it varied WAY too much depending on mods and the car itself. Just keep upping timing until it knocks or you're getting less than 5whp/wtq gains with each degree you add. I usually push the entire tune to the onset of knock, then pull out 1 degree across the board to account for weather/bad gas/4th gear pulls/etc...

^ that's been my method as well. Come Wednesday I'll push it some more.