SAFC or Enthalpy?

[lilskyline240]

ive been gettin conflicting reports on whether or not to use a SAFC to tune my 370cc injectors....soem ppl say it will be fine, other say it wont...im goin to be running a t25 with s13 sidemount, and 370cc injectors....i plan on gettin the car tuned by AMS with an SAFC....i plan on runnin 7psi daily and 10psi in autoX, if that......what are your thoughts on the situation.....SAFC and tune?? or enthalpy tuned ecu

[Florida240sx]

7-10psi you'll be fine with safc. Anythign over that you need somehting to control timing. at 7psi your fine on stock timing. at 10psi you'll need to retard timing probably 2 degrees. You must run 93 octane. Enthalpy tune is very good. But for that low of HP SAFC is fine. Only worry about ecu tune if you are going over 12psi.

[240DRFT]

wont the enthalpy be tuned for a certain boost, so changing it from 7 to 10 would make it off? with the safc u can have multiple settings.

[chrislis]

psi is not conflicting with the enthalpy tune.

[Florida240sx]

No enth tune is good through out. But after 10psi you'll need something to control timing and SAFC doesn't do that. Just affects fuel...

[240DRFT]

psi is not conflicting with the enthalpy tune.

i see... i didnt know thats why i asked

[lilskyline240]

thanks guys...i knew i could count on you guys to help me with this....im just gunna go with the SAFC and get it tuned by AMS cuz i got a contection with them....i will be running 93 octane all the time as i do on all my turbo cars...should i back out some timing at 7psi or no??

how do i set my SAFC also?? its not an SAFC2 its the first one...not the one with the buttons tho...and should i run it slightly rich just to be safe until i get it tuned

[chrislis]

if you could, avoid driving the car until it's professionally tuned. a buddy of mine had a BUILT ka-t, running 8 psi with an SAFC. he ran out 10 minutes down the road to get something form pep boys and thought he had a good base tune on it for just that far. downshifted going to a light and blew the motor up. don't be like him. it's worth the $75 to flatbed the car to the dyno.

[KATwo40]

With the T25 @ 10psi you'll need to pull more like around 5* base timing. The issue of high exhaust manifold pressure comes into play, resulting in reversion, loss of VE%, etc.

Tune @ -27 across the board, stay out of boost, drive conservatively to AMS and let 'em do their stuff.

EDIT: On another note, the Enthalpy ECU tune IS somewhat boost specific. If you tell him you're running a T25 @ 10psi and he tunes it for that, then you swap to a T3/T04E and run 20psi, don't expect the tune to be correct for the swapped setup.

[lilskyline240]

now im still as confused as before...some ppl think ill blow my motor...others say it will be fine for low boost....idk what to do

[KATwo40]

It will be fine for low boost. Don't plan on running more than 10psi, ever. Run about 15*BTDC base timing, set the SAFC2 to -27 across the board (hi and lo throttle settings), then take the car to AMS and let them fix you right up.

That better?

[lilskyline240]

i that was my plan...but ill have the setup on my car for like a week or 2 before i can get down there....so i want it to be ok to drive for awhile

[KATwo40]

Should be fine, just don't go rompin' the crap out of it.

[Florida240sx]

Tow your car. Or get a wideband from someone. Ruuning rich isn't a big deal but running lean is.

[KATwo40]

-27% isn't going to be lean for normal driving. The stock ECU is calibrated overly rich anyhow.

Could go -25% to be a little more on the rich side.

So long as there's no "on-boost" driving, it'll be fine.

[lilskyline240]

what about what jordan gladman did....with teh n60 maf and 370cc injectors....no fuel management at all....was running fine on 94 octane for the 2 weeks or so he had the car...that way i would completely eliminate the SAFC so i should have no timing problems

[KATwo40]

what about what jordan gladman did....with teh n60 maf and 370cc injectors....no fuel management at all....was running fine on 94 octane for the 2 weeks or so he had the car...that way i would completely eliminate the SAFC so i should have no timing problems

That was for his particular application. If I'm not mistaken, he did this on a SOHC engine. Not sure if you're using the same engine.

Every engine is different. Same with different turbo combinations. If you choose to do the N60 and 370's, you still have no fine tuning adjustment. It would be much better to at least have some sort of tuning capability to work out the little rich/lean spots in the fuel curve.

Just get the SAFC2, 370's, set it up how I told you, drive conservatively and let AMS tune it up for you.

[Florida240sx]

His car was fine yours may not be. Unless you got a wideband you won't know.

[lilskyline240]

i just dont know how long it will till i have time to get to AMS cuz i work 5 days a week and have little to no time to drive to IL as i am in WI...so im lookin for something that will be reliable for the time being until i get it tuned for more power

[KATwo40]

Wow. You can't find ANYONE in your state to tune your car???

Maybe you should just put this off until you can either make arrangements to get it tuned immediately after installation, or get yourself a wideband and learn to do this yourself.

[lilskyline240]

yeah, it sucks to live in WI...the nearest reputable tuning shop is like 150 miles away...

[KATwo40]

If you wanted to fly me out, I'd tune it up for ya'.

Email concerning this:

[email protected]

I have an LM-1 wideband with the datalogging junk/laptop, blah blah blah.

We could at least hit the local strip and tune there ($10-15 per day for all the 1/4mi runs you can handle...makes for some decent data logging opportunities).

Lemme know.

[2FourTee]

if you could, avoid driving the car until it's professionally tuned. a buddy of mine had a BUILT ka-t, running 8 psi with an SAFC. he ran out 10 minutes down the road to get something form pep boys and thought he had a good base tune on it for just that far. downshifted going to a light and blew the motor up. don't be like him. it's worth the $75 to flatbed the car to the dyno.

Or you could get a tank of race gas for about the same price. Would be extra insurance for when they do their tuning too.