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Old 02-02-2001, 12:55 AM   #1
8Complex

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Post Stock ECU with lowered compression?

Seems to me that it doesn't sound like it'll work right. I can't figure if it'd end up lean or rich, though...
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Old 02-02-2001, 05:20 AM   #2
Memnoch
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I would think it'd end up too rich. Since with higher compression you always have to richen up the mix to avoid detonation.

That's all that comes to mind, and most likely it's wrong too
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Old 02-02-2001, 06:51 AM   #3
scoobiejosh
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I would think richer. With lower compression the combustion isnt as efficient. And it might injest less air. I dont know how MAF or MAP would deal with that, not practical experience. Usualy when someone lowers the compression they do other things like add a turbo or turn up the boost, so there are too many variables at once to narrow one down.

Josh
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Old 02-02-2001, 07:34 AM   #4
svxtrem
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Neither. The compression ratio doesn't affect the mixture. It will affect the need for timing. A lower compression ratio will require more total timing due to the larger volume of the combustion chamber. A lower compression ratio will also lower the thermal efficiency. This is the correct approach if you are going to add a turbo, but definitely not for N/A.
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Old 02-02-2001, 09:05 AM   #5
8Complex

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Yeah, turbo in the near future, but I figured if I ended up having to have the short block replaced (piston slap) that it'd be an ideal time to slip a few luxuries in.
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Old 02-02-2001, 09:27 AM   #6
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Thanks svxtrem, I knew I had my head up my ass
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Old 02-02-2001, 09:37 AM   #7
8Complex

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I just talked to Trey Cobb about it and he said that it would run fine, but like it was a bit old and worn. If I wanted to correct for some of the power back, I'd need to have an ITC to correct the timing. He also mentioned that I'd want to flush the system of carbon build-ups before I installed the turbo (which I'm not entirely sure how to do... spray a mist of water so that it it'd intake it and do soms steam cleaning?).
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Old 02-02-2001, 06:09 PM   #8
98mpreziveRS
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Umm..nick please do not do that..lol

they make cleaners meant for that...so do yourself and your motor a favour and get the right tool for the job (and don't hydrolock your motor in the process )
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