JWT ECU's

[SRPWR]

Do any of you guys run a SAFC in addition to you tuned program?

[codyace]

No, and you shouldn't. List that SAFC for sale on a DSM forum and enjoy you car

[SRPWR]

Thanks, my car w/out the afc runs a hella lean at idle, i guess i should look for other issues????? I got 50# msd's and a z32 maf upgrade.

[vutony]

if its tuned/chipped ecu, why would u need it

[codyace]

Thanks, my car w/out the afc runs a hella lean at idle, i guess i should look for other issues????? I got 50# msd's and a z32 maf upgrade.

What's hella lean? All JWT Ecu's I've ever dealt with idle 13.8 - 14.8 at idle....right thwere they should.

[exode]

same prob here, 55lb msds and a z32 maf. Really lean, we are talking 0.01 co and 150+ hydrocarbons. I get about 100 knocks in the 500-1000 rpm range and then goes up to 150.

i'm running an enthalpy ecu, thats the only difference

[hpmachine]

I've heard Enthalpy tunes more aggresively (leaner) than JWT. I use a JWT ecu and an SAFCII. I'd be sunk without it. I'm always playing with my fuel pressure and boost depending on my driving circumstances. I had my SAFCII unplugged a couple times and my car ran really rich without it. My ecu is tuned for my 740's and z32 maf, but I've also got cams and a wacky sc61 turbo. My advice is to get your JWT ecu and a wideband o2 gauge. Run it like that and monitor your afr. If you think it needs some adjusting then get the SAFCII.

(Oh and codyace, I recirced my bov, and my car is much happier now. And so am I! thanks for the advice)

[exode]

But am I running so lean that I'm going to blow my motor?

[hpmachine]

It really depends on when you are running lean. Are you running lean under all driving conditions especially while in boost? Cars can idle at 16:1 without a problem but once it's in gear and under load you'll want it a little richer. I'd definitely invest in a widband gauge. They are a bit pricey but it will allow you to tune a little bit and give you peace of mind. Just for reference your afr's should be about like this. - Idle (and in vacuum)- 15:1 -14:1 In boost or 0hg- 13.5:1 WOT- 12:1If you aren't sure what your afr's are, I wouldn't boost it. I believe the immediate danger in running lean would involve burned pistons and valves.

[hpmachine]

^ meh sig?