Quote:
Originally Posted by SS_Firehawk
For clarification. All untuned dyno comparisons to the tuned ones were not taken the same day as the tuned ones. I'm only showing the difference between them and the three month difference in power.
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I'd say the major difference is in the temps -- < 60 F* for earlier runs and > 100* F for later ones! Even with correction (and the CF's are huge!), it will not be able to compensate. You will still see massive differences in power output.
After reviewing all dynos and taking that into consideration, I think best power is factory IM + tune.
Yes The Motordyne intake picked up a little in the midrange, but I think not enough to warrant the loss up top. The headers are probably outflowing them, and costing power up top. They might work better with factory headers.
Also, keep in mind it will take 3-4 runs for the fuel trims and such to adjust to make sure you are hitting target AFR's. Timing may also fluctuate a bit before it stabilizes.
If you want to compare and contrast more definitively, do same day, factory tune with mods, 3 runs, 15-20 min cool down, flash tune to ECU, do another three runs. Keep note of oil temps (try to keep them around 200-210* F).
If you have any more drfs, pelase feel free to send them my way -- thanks again!
EDIT: Nope -- I'm wrong. The tuned M370 dyno is very comparable to the tuned OEM IM dyno, and it clearly out performs it in the midrange.