Quote:
Originally Posted by Rombinhood@OpenFlash
Good post and info! Below is some feedback from Shiv@vishnu
Yes, the dip was reduced in both duration and severity by advancing the exhaust came. Running 40deg of advance down there. Looks like the factory mapping makes some concessions in that respect. Perhaps for fuel economy or emissions.
I'll be tuning some stock header/stock exhaust cars tonight this week on the dyno. So then I'll be able to quantify the differences in mapping requirements between a stock and fully modified set-up. I agree that the first tuning step would be advancing the exhaust timing (and intake). Seems to pick up great power with no real downsides that we care about.
I'm glad you found the same thing. My first tune attempt was also met with marginal success when I tuned for AFR that was clearly too lean for this engine. It really needs to be rich in the low end/midrange. Especially with the VVT changes. Without enough fuel, the engine will sound hollow and not make max torque.
I'm looking forward to calibrating the E85 map. Thank you for sending me good starting points for injection calibration. It should save a lot of time!
Cheers,
shiv
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Mad_SB wasn't the only person who asked a question.
Specifically mine was does the stage2 tune with mods show less tip-in knock than stock ?
Thanks