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Re: anyone mapped the stock c900t ignition curves?
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Posted by RogerB (more from RogerB) on Sat, 4 May 2002 15:09:01 Share Post by Email
In Reply to: anyone mapped the stock c900t ignition curves?, kooch, Sat, 4 May 2002 03:25:14
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I have, but can't find it, but it was posted here as Beaudreau, was stock stuff, not the SDS stuff John N posted.

The stock advance under vacuum is a moot issue, since it is controlled by ported vacumm, which can really only be mapped dynamically. Ported vacuum only really happens at low throttle, high vacuum conditions, such as cruise.

You are in a whole new world now, I suggest you leave the stock map behind, you can run what you know if you want, but you won't find much power there. Plug something simple in, say 20 base, 30-32 total all brought in by 2800-3K. Don't worry about vacuum advance too much at present, that's more for fuel economy and that won't happen unless you lower the fuel values as you bring in more timing. You shouldn't have to retard until 4-6psi, if you have to retard more than 20 under high boost, you are losing power anyway, drop the boost or preferably add water, starting around 8-10psi, extra fuel isn't really much help.

posted by 216.128.13...

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