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Re: HKS super afr or Apexi safc
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Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Sun, 27 Oct 2002 21:50:51 Share Post by Email
In Reply to: Re: HKS super afr or Apexi safc, Vince T, Sun, 27 Oct 2002 20:15:29
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with both of these, need to know how they scale the amm signal, ie is 30% really 30% more fuel or 30% more volts (not same thing).

the hks-super-afr is a univeral design, more direct install, and may work with big inj's, and lh 2.2, but that assumes the variable out tps input for 'transient enrichment' is not mandatory. for the 220+ hp range, still would need to just set whole 4.5K+ range extra rich to make up for amm signal flat-line.

the apexi safc is jap car specific, and takes some thought to set right for old saab (raul never got there). the variable tps is more critical for performance, so mabe lh2.4 would be better match. with hi/lo ranges and linear interpretation between, the 220+ condition could be better isolated in the high range.

at 200-220 hp the amm output flatines, so hope that with say 34# inj and a box like these, the duty cycle at amm limit still has headroom. these things should continue to increase amm out volts toward 5V, as rpm's increase, but not hit 2.4 fuel cut limit.

bottom line is could likely slap one in, but better know what u are doing to make it work close to right. they potentially could allow amm out volts to continue increasing beyond normal amm limit, but still (very roughly) in ecu maps. much easier to use these on a speed density system, scaling more linear MAP sensor out with big inj's.

sounds good for amm, but reality of scaling down an amm flow-vs-volt curve that is a cubic polynomial ( flow = a + b*V + c*V^2 + d*V^3 ) is easier said than done.



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