Say someone did an Ecotec engine rebuilt with 8.9:1 Compression Pistons instead of the stock 10:1. Would the ecm adapt to that change and adjust timing and fuel maps accordingly? Would it take to the change in compression easily?
I know it's hypothetical, buy say an Eco had 140 whp with 10:1 compression, would the lower compression cause a drastic change in power? Any ideas what it would be around?
Thanks.
Well, I know that the 03-up eco ecu's would almost certainly adapt for any fueling changes, at least while out of power enrichment. In power enrichment, it would probably run a tad rich as you're not getting the squeeze you should and it would result in less efficient combustion.
As for timing, i doubt it would adapt as I don't think it will increase timing past whatever the map says to even if the conditions allow for it. By lowering compression, to make up for the power and efficiency loss you'd want more advance but the ecu can only provide ignition advance up to the point where the map is written.
My question would be, why this hypothetical situation? I'm guessing you plan to build a motor before getting tuned/turboed/whatever? It should be fine enough to drive on until you can get proper tuning, but obviously power and fuel efficiency will suffer in the meantime.
Arrival Blue 04 LS Sport
Eco
Turbo
Megasquirt
'Nuff said
Scarab (Jersey Jay 1.8T) wrote:Well, I know that the 03-up eco ecu's would almost certainly adapt for any fueling changes, at least while out of power enrichment. In power enrichment, it would probably run a tad rich as you're not getting the squeeze you should and it would result in less efficient combustion.
As for timing, i doubt it would adapt as I don't think it will increase timing past whatever the map says to even if the conditions allow for it. By lowering compression, to make up for the power and efficiency loss you'd want more advance but the ecu can only provide ignition advance up to the point where the map is written.
My question would be, why this hypothetical situation? I'm guessing you plan to build a motor before getting tuned/turboed/whatever? It should be fine enough to drive on until you can get proper tuning, but obviously power and fuel efficiency will suffer in the meantime.
I was bored and was thinking up scenarios, so that's where this question came from. Thanks.
