How much compression safely on pump gas?
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Teching In
Joined: Dec 2013
Posts: 42
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I threw away more money on tunes to different tuners than I care to admit. I gave everyone a crack at tuning that car in an effort to get rid of the knock. Started with PCM4L and they essentially ripped me off. Then Solomon and the car was pig rich and he was impossible to work with. Then PCM Performance - tune made good power but still knocked. Then Moe Bailey. Three revisions after datalogging with Moe and he just stopped replying - never did get rid of the knock and my transmission shifted incredibly harsh when warm despite never asking for any changes there. And by "harsh" I mean it would nearly chirp the tires going from neutral-to-drive, or reverse, or park-to-any gear when hot. I know he's got a stellar rep as a tuner, but he left me high-and-dry. (Topic for another thread, perhaps...)
Finally got Chris (Rocko) involved and that guy really took his time and dialed it in using all the tricks in the book. I think we went back and forth with 6-8 logs over the course of 3 months and he had to adjust fueling and timing to such an extent that it became obvious we were just dealing with too much compression.
Popped in the thicker HG and rolled back in the lost timing and haven't had a knock since.
Finally got Chris (Rocko) involved and that guy really took his time and dialed it in using all the tricks in the book. I think we went back and forth with 6-8 logs over the course of 3 months and he had to adjust fueling and timing to such an extent that it became obvious we were just dealing with too much compression.
Popped in the thicker HG and rolled back in the lost timing and haven't had a knock since.
I ran 11.5 with a 396 and 11.4 with a 388 both motors had a cam that had an insane amount of cranking compression. Went with a bullet cam and it went from high 8's to 8.6's on alcohol. I was running 94-104 octane at the pump with the old cam.