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Trying to dyno tune a 300c. Baselined 338hp on a diablosport tune, going to the stock tune went up to 345hp, My best tune was 348hp. Where is the power at? Ive tried leaner, more timing, moving the exhaust cam both ways, everything looses power vs what i have.
Forgot to mention, cai, shorty headers, catback.
what are you using for fuel?
*email me a log if ya dont want to post it
Running 93 octane. Ill get back with some logs.
The log with stock timing picked up about 2hp, tune 3 gained about 1hp more. Tune 2 had more spark advance and did not do as good as 3.
you are not logging knock voltage or knock retard - very important to do so with a mopar hemi on pump gas
the reason it made less power on "tune 1" is that dip in timing at high rpm
looks like the pcm saw voltage there and pulled the timing back 4 or 5 degrees
see the dip?
compare that to the stock log... looks like it saw some voltage around 4600 in that one, pulled a couple deg there, then ramped them back in and the timing held til you lifted
on the stock log the t stat was not open yet (its a 203?) and ECT was 190 at the hit... compared to the tune 1's higher temp
closer to 210
I went back out this morning and checked my logs and noticed the coolant temp difference. Picked up 5hp peak and more through the curve.
your fan tune needs work... you have low speed fan at at higher temp than high speed fan!
and there is no hysteresis for any of it
i have seen fans fail because of that
Good catch on the fans. On my end it was showing around 32F for hysteresis. Aside from the enable temps being butchered the hysteresis was a hpt glitch.
you gotta use native values with dodge
This wasnt my first hemi maybe just the first time for this os. Still learning on these but not much info is out there compared to chevy. This was my first dyno tune on a hemi.