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Old 06-28-2008   #1
scheides
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Re: safcII help

Just remember, like mentioned above, the 2G mas will add another offset to your overall formula. 650's are 44% bigger than stock, so you should shoot for about -44% (take out 44% to get back to zero.

The 2G mas scaling is 20% higher than stock, so you need to add 20% more fuel to make up for it.

This brings you back to your initial target of about -24% on the AFC. Now, in practice, because injectors are injectors, you want to keep your idle rpm-area values close or possibly even above zero. Then, swoop down to about -18 as you get to 3000rpms, and then find a happy place (you have a logger, right? ) that is *around* -20 to -24 through the rest of the rev range.

High throttle you will be at roughly -10 to -15 at 2500rpms, gradually going down to -25 at 4000, and then keep a semi-steady value up to redline.

I've had 2G mas (or 2G maf-t) and 650's both my DSM's, and even tunining hughes' laZer w/ 550's we got *vaguely* similar numbers.

The real answer though is: get a logger, or go get a tune from shane
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Old 06-30-2008   #2
asshanson
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Re: safcII help

Quote:
Originally Posted by scheides View Post
Just remember, like mentioned above, the 2G mas will add another offset to your overall formula. 650's are 44% bigger than stock, so you should shoot for about -44% (take out 44% to get back to zero.
I believe this is incorrect? While it's true you have to add 44% to get to 650, you don't take out 44% from 650s to get back to 450s. You take out 31%

650 * .69 = 448.5

On my 660s I think I had -32% correction for the low throttle settings.
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