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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 04-28-2010, 05:15 PM   #1
HemiCharger
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the 10-15% ethanol blend COULD cause knock if you were tuned on 93 octane and let's say tuned very aggressively.

I do not know what you mean by aggressive? High boost for me is around 17.5-18 lbs and that is only when I had trouble even with the blended gas boosting at low levels or waste-gate 8 lbs it never would knock. Only up top on high boost when I had blended gas in the car.
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Old 04-28-2010, 05:42 PM   #2
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I do not know what you mean by aggressive? High boost for me is around 17.5-18 lbs and that is only when I had trouble even with the blended gas boosting at low levels or waste-gate 8 lbs it never would knock. Only up top on high boost when I had blended gas in the car.

AGGRESSIVE = a lot of timing and AFRs in the 12+ range under heavy boost.

Theoretically that could be just fine, bu 10% ethanol may be enough to make that knock.
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Old 04-28-2010, 05:52 PM   #3
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AGGRESSIVE = a lot of timing and AFRs in the 12+ range under heavy boost.

Theoretically that could be just fine, bu 10% ethanol may be enough to make that knock.
guess that would cover it. How much knock will our engines take without doing damage to them? I think they are pretty stout engines. Of course once I picked up on what it was doing I stopped pushing it until I could get the better gas in the car then I could boost the hell out of it.

what is the easiest way to learn engine dynamics?
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Old 04-28-2010, 06:22 PM   #4
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guess that would cover it. How much knock will our engines take without doing damage to them? I think they are pretty stout engines. Of course once I picked up on what it was doing I stopped pushing it until I could get the better gas in the car then I could boost the hell out of it.

what is the easiest way to learn engine dynamics?

Honestly, I just do a bunch of reading and searching....

From what I have heard, the rods are pretty strong, but the pistons are potentially weak....a lot of people upgrade the pistons if you are gonna push it past 400 hp....
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