I was just wondering something...
Could the Ecotec Reflash account for pistons having different compressions?
Meaning, could I swap from the 10:1 compression to a 8.9:1 or 11:1 compression pistons without any problems?
Right now, I run 93 octane anyway because of the supercharger.
So you're saying that upping the compression and using 93 octane I would be fine.
What about dropping the compression and instead of using 93 octane, using 89? Not saying I want to, just wondering.
How would a different bore affect the ecu?
The ECU cannot compesate for any internal chages in the motor other than airflow.
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
well technicly that is partially true , the pcm doesnt know what the compression is
but it does know " knock " , and higher compression will be more prone to knocking , then lower compression , and the pcm will adjust for it
but with the s/c you want to keep the off boost tq , and that requires a little compression , since you need it to help with the load from the s/c
where a turbo doesnt eat any power , the loss of tq from the lower compression wont hurt as bad on off boost driving
all of this is provided you dont get any knock
and from what ive talked with others about when gm says to use premimum fuel , 91 isnt it , and 93 or 94 are usually what the car needs
^ The knock sensor is a symptom adjustment, not a pre-adjustment type thing. The ECU compensates for knock AFTER it happens, that means that if you get a couple good knocks at higher RPM, the ECU won't adjust for it until after the knock occurs, at that point, it may be too late. Never EVER rely on the ECU's knock-learn to save your motor, or to adjust for lack-of-tuning.
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thank you for adding that
i was at work , so i didnt get to type out everything i wanteded to say
Shifted wrote:^ The knock sensor is a symptom adjustment, not a pre-adjustment type thing. The ECU compensates for knock AFTER it happens, that means that if you get a couple good knocks at higher RPM, the ECU won't adjust for it until after the knock occurs, at that point, it may be too late. Never EVER rely on the ECU's knock-learn to save your motor, or to adjust for lack-of-tuning.
Can the ecu remember what conditions cause knock? When they begin to occur can it automatically pull timing before it happens?
Admiral Jedi wrote:
Can the ecu remember what conditions cause knock? When they begin to occur can it automatically pull timing before it happens?
the ecu is reactive, so no
At least the ECU used in the cavvy is reactive only.
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'96 Cavalier Good ol' Pushrod 2.2
-24X,000 miles on factory build
-Some oil loss between changes, me thinks it be rings.
