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Old May 31st, 2011, 02:20   #12
Volvo Canadian
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Last Online: Oct 18th, 2017 23:16
Join Date: Nov 2010
Location: Calgary (again!)
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Hi - I've asked the seller if he can install the B20E curve, otherwise, I'll go on the forum, like you did, but we should stay in touch about all this. What mods do you have on your engine?

Yes, I understood there were other variables than rpm, so I guess that makes it 3+d mapping!? Not so simple.... I'm thinking right now I'll start with 8 degrees btdc instead of 10, and 30 at "max" rpm (3,800 is factory, I believe, maybe 29 at 5,000rpm). Whatever the curve is for engine temp, I'll stick with that (higher temp, faster combustion, lower advance, nothing to do with engine mods)

I am planning on getting the car on the dyno to check things out.

I for the vacuum, you have higher vacuum at low throttle, at which time you are running a lean mixture, which burns more slowly, so you want more advance. At zero vacuum (throttle open), you want zero vacuum advance, and at max vacuum (not sure what the units are) you want an advance of ....15 degrees??? Hmmmm, that means 25 degrees of advance at idle - cannot be right!! I'll look at the curves.


Okay - comments, please.
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