would anyone recommend the apexi safc for the following setup:

d16a6 with ported/milled head, about 9.8:1 CR, stage 2 cam(crane, web, exo or delta grind), Y8 intake manifold, 58mm b16a TB, I/H/E, blah, blah, blah. i already have an adjustable FPR. i was going to rig up a potentiometer to the IAT sensor (since i have to relocate it anyways) but the more i think about it, theres only one adjustment and its kinda ghetto.

or should i do the following? (from - https://honda-tech.com/zerothread?id=180629)

or is it just overboard and not really worth the money?

 

The SAFc and VAFC are two totally different units. I have an SAFC and have installed many VAFC's. The SAFC will let you change your fuel maps throught the RPM range + or - , it also allows you to play with different atmospheric pressures in your intake manifold. I'm still not totaly familiar with it, but it is not the same as the VAFC.


[Modified by ZC_CRX, 9:58 AM 2/25/2003]

 

i have also heard that with the SAFC you can monitor your air/fuel ratio. which you cant do with the VAFC.

so overall would you say that it would be a useful tool for tuning on an engine combination like i have? or will the ecu correct for any modifications that i have done and the money is better spent elsewhere?

 

If you don't have a Vtec engine don't bother with the VAFC. Yes, you can monitor the air/fuel and i beleive there is a way to tune it also. The VAFC is similar, but its main function is to change the Vtec crossover point while the SAFC is to monitor and regulate air/fuel going into your engine. If you tune it too much you may get check engine lights. This happens to me all the time. Usually I get the BARO code, which is inside the ECU.

 

VAFC and SAFC both can adjust air/fuel mixtures. The SAFC has a narrow bank air/fuel meter same thing as autometer not very accurate for good tuning, you need a wide band set up to be 100% acurate. The V-AFC allows you to adjust the low and high cam lobes so it can adjust air fuel between V-tec switch over. Both do the same the just the V-AFC has the xtra adjustments for V-tec engagments, yes you can use that switch to activate anything that needs 12volts like a shift light, it can still be used with a non-vtec engine just dont adjust the high cam and turn the v-tec engagment high so it wont try to activate it. The Baro sensor isn't in the ECU its on the passenger kick panel .

 

the safc does NOT have a built in a/f meter. it has one extra volt meter for a sensor thats not used on hondas. info on setting it up: https://honda-tech.com/zerothread?id=262923

the safc will allow you to ajust your fuel curves in >=500rpm incraments with a maximum of 8 points of adjustment for both high and low throttle situations. it modifies your map sensor voltage to the ecu to make the computer think manifold pressure in increasing of decreasing thus adding or removing fuel. it does this at .1 of a volt intervals with max of 5 volts and min of 0 volts.

the vafc does the same however i believe it has a nicer points of adjustment. in addition, it alows for vtec activation adjustment.

i use the safc and love it. if you know how to tune w/ it you're in good shape.

 

Ok I knew you could use it as a A/F some how. I read the article but its no way as acurate as a wide band o2. Its the same thing as a autometer a/f isn't that correct. Is the SAFC points adjustable?? I know the V-AFC RPM ranges are adjustable and you can set those to a specific RPMS also. I have the v-AFC never seen/used a S-AFC or a AFC-R. Either way each has its perks and drawback the other may not have. If you dont need the V-tec activation just get the SAFC save xtra $$$$, if you plan on going v-tec save up and get a V-AFC

 

when moitoring o2 voltage w/ the safc, you have readings up to one thousanth of a volt.. autometer goes to one hundreths. many others only use tenths (K&N, MSD)

search the DSM boards, the output w/ the safc is dead inline with wideband o2's. voltages are different obviously (0-1 vs 0-5) however net affect is the same.

 

ok I was told it was the same as the autometer with the hundreths guess if its 1000ths would be alot better. Stand correct good info about that. DSM boards?? I have no need on a dodge forum

 

yeah .XXX = thousanths

WOT i like to hang around .750 around a 13.X:1 ratio. however ive had much success @ .860ish 12.x:1 which sounds way rich and it is.

i forgot. you can use the safc on a wide band o2 sensor if you want. your results would be 0.000-5.000volts. i dont know what the max voltage that thing will read it, it could be 9.999 or 99.999. i lean towards the 1st assumption.

and yes you can get a more accurate result from a wideband o2 sensor and the safc simply because X.XXX says more than .XXX, however most wide band scanners do X.X-X.XX. but the results corolate very acurately w/ .XXX with a regular o2 sensor.

2 problems with using the safc to monitor a/f, you cant data log nor can you view rpm etc w/ a/f ratio. its on a totally seperate menu from the other engine stats. tis why external guages are quite usefull


[Modified by limoZeen, 2:52 PM 2/25/2003]