370 LQ9 and timing
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From: Howell & Fenton MI
The cam is basically identical to the MS3 cam, but with more advance in it! As far as the timing goes we took it as high as 32 at WOT with no knock or detonation whatsoever, but it wasn't quite as snappy so we settled on 29 as the best fit. We tested the car numerous times at various timing levels before settling at this point.The car seems to prefer this timing abs runs much better as a result
Bumping this back up because we've run into a issue and am curious too see if others have experienced the same thing. Car runs awesome with the new tune but one little problem....car has trouble starting when cold. My tuner believes it's because of the IAC being closed when I had my throttle body ported. Since we dropped the idle to 800 rpm from 950 it now has become an issue. Raising the idle back up (which I'd prefer not to do if at all possible) may solve the issue and/or going back to a stock throttle body as well. So I guess my question is are there any other possible solutions to this problem other than what I've already mentioned? Thanks
the problem is 90 percent of the iac circuit is blocked off with epoxy. Command whatever airflow you want but if it physically can't flow anymore air you are SOL. You lose all your resolution when this happens. Be there done that.
^what he said. if your iac is blocked off it wont do anything. drill the iac hole back out to 3/8 and i bet it will go away. Samething happens with a lot of the fast tb. The iac hole is too small for big cammed cars. I went through the same thing and I maxxed the iac out on startup and added more air, nothing helped. I could crack the blade and the car would start up just fine but then my iac wen to 0 at operating temp to control idle and that took all of the adaptive idle control away from the pcm so that didnt work either.
Went to a NW tb and changed NOTHING from the fast tune and it busts right off every time. I actually had to lower the tables because it was too high from the fast. In general though adding startup airflow and then controlling how fast it gets ramped out will solve that issue
Went to a NW tb and changed NOTHING from the fast tune and it busts right off every time. I actually had to lower the tables because it was too high from the fast. In general though adding startup airflow and then controlling how fast it gets ramped out will solve that issue
^what he said. if your iac is blocked off it wont do anything. drill the iac hole back out to 3/8 and i bet it will go away. Samething happens with a lot of the fast tb. The iac hole is too small for big cammed cars. I went through the same thing and I maxxed the iac out on startup and added more air, nothing helped. I could crack the blade and the car would start up just fine but then my iac wen to 0 at operating temp to control idle and that took all of the adaptive idle control away from the pcm so that didnt work either.
Went to a NW tb and changed NOTHING from the fast tune and it busts right off every time. I actually had to lower the tables because it was too high from the fast. In general though adding startup airflow and then controlling how fast it gets ramped out will solve that issue
Went to a NW tb and changed NOTHING from the fast tune and it busts right off every time. I actually had to lower the tables because it was too high from the fast. In general though adding startup airflow and then controlling how fast it gets ramped out will solve that issue
I would just swap to a fast 90 or do the 90 mm tb mod if it were me. Or I would sell that tb and port a stock tb without touching the iac circuit.
Thread Starter
TECH Senior Member
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From: Howell & Fenton MI
