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Discussion Starter #1
OK, i got the SAFC. Soon, I will get the 370CC injectors. Now I know the advantage of the SAFC is to smooth out the idle with forced induction. How low should I go with 370CC injectors for low throttle 1000RPM through 7000RPM? for high throttle? What should the low and high throttle points be? 10% and 40%? thanks.
 

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You can't really do much with a SAFC on a Honda FI setup, IMO.

With the 370cc injectors, you're going to flood your engine at idle, as you most likly know. With the AFC, I believe the tuning limits are 30% in each direction of the stock ECU's fuel maps. The 370cc injectors are about 54% larger than the 240cc injectors, so you'd have to subtract -54% on the AFC, which is something that can't be done.

I've seen a few turbo hondas with 370cc injectors only being regulated by a SAFC. The idle is poor and they trip the rich CEL #45 all day long. Their settings are full negative until mid RPM, where the boost comes into play. A $35 B&M unit would solve this problem, as I've stated in your other thread, but it's your car. Do what you think is best...
 

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What kit did you buy ? Or is this a custom kit/build ? Why are you running 370's ? Stock injectors are dam fine until your pushing more boost say 10psi and above ! And you really need to have a intake manifold like a Skunk2 OR Victor X to balance this out on the Air side as well.
 

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The thing is adjusting to the max can cause an out of range error. The AFC doesn't directly control the duty cycle. Going very negative will indicate near-nothing air flow and the ECU will hit the lowest fuel MAP; you cna't go any farther than that.
 

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TurboLS on Aug/06/02 said:
My mechanic said i should get them (strongly recommended) to aviod leaness. Also, Gvtec, i checked the SAFC limits just now, they are 50% in each direction, so think i will be ok with just 4% rich everywhere. what do ya think?
Man...a bit more details...please...I hope your not on a path of problems...I dont like that your using 370's worries me a bit...until I know more details.What kit did you buy ? Or is this a custom kit/build ? Whats the turbo CFM ?
 

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Discussion Starter #7
it's a custom kit; i am piecing together myself. also, SAFC's are supposed to be able to smooth idles for up to 440CC injectors. I guess maybe it only works with the AFC hack thing, but i dunno, the wiring diagram for the SAFC-controlled fuel injector setup looks stock. apparently you can run 10 psi boost without an FMU or check valves b/c of the AFC's intervention. I am not sure of the turbo CFM, it is a T3, the polished silvery side says .43 i think; the second number is a little blurred.
 

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Discussion Starter #9
Ok, finally put in the 370cc injectors. First, the o-rings supplied with RC injectors did not give enough clearance for the fuel rail mounting screws to be put back on. So i had to take an exacto knife and cut them in half. that seemed to work, no leakage as of yet. Then the tuning came. I had heard -46% was a good idea across the board, i tried it, and my engine would stall. Then i slowly tried decreasing the negativity, and got it to smooth out around -30% across the board. The only discrepency is when i am pulling up to a light and i push the clutch in, the tach looks like it will die (the needle almost hits 0) and then i guess the ECU compensates and brings it back up to about 750RPM. I should also say that I adjusted the IAC valve so much that the intake filter (AEM style) started to whistle at idle. one other thing i noticed while test-driving was the throttle engagement. WHen ever i would let off the throttle and then push it down again, i would feel a jolt, much more pronounced than with the stock injectors. any and all feedback is appreciated.
 

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You're really just screwing around with the settings it seems like. As I take it- you do not have the turbo installed yet. If that's true, you should honestly try to keep everything as stock as possible for the time being - put the turbo on and tune from there. (ie: Tune the S-AFC back to a reasonable level and screw the IAC back to where it was.)

Since you have the injectors on right now - you may want to lean out everything a bit more to compensate for all of the fuel flow the injectors should be pumping in. Fix that idle and you should be set.

I hope everything works out well for you.
 
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