Quote:
Originally Posted by California98Civic
"As much as" is interesting to me. Do you mean that the Cali HX engines/ECU were set up for a "lean burn light"? Is that what you read? I know from I think MetroMPG that the gen 1 Insight had lean brn even in Cali (got a ULEV rating in fact). So maybe the HX improved on the VX lean burn somehow, sorta on the way to where they got the Gen1 Insight?
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From what I have read/remember:
The VX cali vs fed was narrowband/wideband O2 sensors and ECU differences.
The HX got the roller cam over the VX model and
Cali ECU has more restrictions in going into lean burn
Fed ECU goes into lean burn easier.
Both are same lean burn, just easier to get into and stay in on fed.
My brother has a cali HX and when he swapped to fed ecu he said he "thinks" it gets into lean burn easier, but it could all be just a butt dyno effect. So for now I am just saying its all based off memory of what I have read.
Again from memory,... the lean burn mode changed from altering AFRs from pre 2001 to just altering throttle control to post 2001.
Meaning true lean burn was no longer available for 2001 + model HX civics,... but I have read some conflicting reports that it is still offered even now. I haven't confirmed any of this myself, but I have done a lot of research on lean burn, vx, hx, 3-stage for pre 2001 models and am pretty confident what I wrote is true.
PS, I have decided to run my y8 with a 3-stage head on a p2j-003 ecu(already found and purchased) which took advantage of all the above mpg/lean burn/vtec,.. except roller cams.