1987RX7guy

iTrader: (3)

Well like i said in my other thread about the ecu pinout i have just finished upgrading my injector array from the four 460cc injectors to 2 550cc primaries and two 720cc secondaries. I have an S-afc obviously to tune back/forth these puppies. From my calculations to return to(or close to...) stock I need to turn back the injectors from 0-(~)3800rpm about 16% and 3801-8000rpm about 27%

I calculated this by using the following:

460*2= 920 / 550*2=1100= 0.836(84%) from 0-3800rpm


460*2=920*2=1840 / 550*2=1100 +720*2=1440 =2540 = 0.724(73%) 3801-8k


Am I horribly wrong?


Santiago

NZConvertible

You are basically correct, but the S-AFC only has points eight at 1000rpm intervals and you can move each point +/-500rpm. So you could do this...

1500rpm*: -16%
2500rpm*: -16%
3500rpm*: -16%
4000rpm: -27%
5000rpm: -27%
6000rpm: -27%
7000rpm: -27%
8000rpm: -27%

*These ones are moved up 500rpm.

In each point between the S-AFC interpolates the correction required (this is explain in the manual). You'll always get a bit of error from 3500-4000rpm where it'll go a bit lean as the interpolation starts at 3500rpm, then a bit rich as the secondaries come on at 3800rpm before getting to where it should be at 4000rpm.

Mismatched injectors is something the S-AFC can't handle very well. You need a standalone for that.

Obviously these settings are just to get the thing running close to stock and not like an over-fuelled bucket of ****. Proper tuning should still be done on a dyno.

1987RX7guy

iTrader: (3)

I guess i should have mentioned i have an S-acf II(thanks to Kevin )

So I have 12 points movable +/- 200rpm from each other Right now I've got The car doing -20% at 800(idle correction...) and 16% to around 3400 when I drop it to about -10% to make sure it doesn't go way lean and hurt itself. After 3800 I am gradually lowering it down to around -10%(wanted to check for one of your responses before I went -27%!!) i'll adjust accordingly.

In your oppinion do you think it would be safe to do the same corrections in the "hi throttle" map too? I have even less fuel reductions in that map. Dyno tunning should come next monday.

YearsOfDecay

how do you have throttle input hooked up???????..

I had my SAFCII throttle input tied to the boost sensor insted of the throttle.... if you do it that way... you can use the low range to take out fuel as a function of RPM under vac and the high range to add fuel as a function RPM under boost.... The SAFC will learn what the max boost is on the car and set that to 100% throttle, and max vac to 0%... Idle will be somewhere arund 5% or so...

this is pretty much the way my Haltech works... this much fuel for this pressure at this RPM.....

If you use the throttle setup... you have no variance for boost.. 50% throttle at 5000 could be 1 psi or it could be 6 psi if you are going up hill......

get it???

SureShot

My S-AFC throttle points are at 10% & 40% so I don't get behind the boost spool up.
I am very interested in the boost approach.

When using the boost signal, do you set the Lo & Hi throttle points at 10 & 50, or maybe higher like 20 & 60?

SureShot

Substituting boost signal for throttle makes sense.
(Why didn't I think of that)

What's the trick to resetting the S-AFC learning function? - Initialize?

NZConvertible

Yes you should've...