Need help with RB25DET S2 z32/safc II

[nvmysrt1838]

ok....i'm trying to get a z32 maf to work with my s2 rb25. i need some insight on a couple of things...now the stock settings on a z32 maf on a z32 would be 1 cylinder 2in / 2out. now my thing is on a rb25 is it still 1 cylinder or do i set it to 6. i'm thinking 1 due to most coil packed cars run like this....just my experience. also i keep hearing a few different settings as far as in/outs are concerned....most popular being the 2in/4out..... someone please chime in with some insight.....i'm losing my mind.

[blues14]

my safc guide says in2 out 4......but i am kinda in the same boat as you, except on rb20det.......did you wire your z32 maf yet??

[nvmysrt1838]

my safc guide says in2 out 4......but i am kinda in the same boat as you, except on rb20det.......did you wire your z32 maf yet??

yea...were troube shooting that and a few other vaccum lines.......i'll update as i go along.

[BlAcK95sE]

bump

[nvmysrt1838]

well...i got the safc to work...but its running really rich...would you normally have to pull fuel with just adding a z32 afm? also theres an adj. fuel pressure regulator on it...that i hadn't touch since i got the motor...but whats stock fuel psi for just double checking....also....i have a vaccum line that when pluged it causes the car to shut off and not run with a lick.....but when left open it runs fine....weird.....where do you have yours routed....

[mrose7716]

well...i got the safc to work...but its running really rich...would you normally have to pull fuel with just adding a z32 afm? also theres an adj. fuel pressure regulator on it...that i hadn't touch since i got the motor...but whats stock fuel psi for just double checking....also....i have a vaccum line that when pluged it causes the car to shut off and not run with a lick.....but when left open it runs fine....weird.....where do you have yours routed....

I beleive its 50 psi...

[nvmysrt1838]

actually i found out its 43psi static....(without vaccum) and about 35-37 with vaccum......but i still need to figure out what that vaccum line does...its screwing meh **** up.

[BlAcK95sE]

somebody on this forum has to have this vaccum line ran to something sombody please HELP!

[blues14]

I have an rb20, and i have 2 lines near where your line is........one goes to the BOV.....the other goes to some emissions cylinder. hope that helps

[digzsublime]

1st. Read the manual for the SAFC II where it gives you the maf values for each car. I know on the RB20, mine was originally set to 1in / 4out. with stock maff. With Z32 it should be 2in/4out (on RB20). As far as I know, you should change the "in" setting to 2in. Leave the "out" setting where it was for the stock maff. I could be wrong, and if so, someone here WILL correct me.

2nd. See step one. If your maf settings are wrong on the SAFC, you car can still run. It just won't run right. Your SAFC maf values may be set wrong and that vaccum leak from the port on the maniold may be keeping it running.

Or your maf settings could be dead on. The poor running could be caused by any number of other things. Bad AAC, incorrect base timing etc. The list goes on. Best idea is normally to hook everything up stock and get it running properly before changing anything else. Break out the FSM and find out what that vaccum port goes to. If it is emmisions, you should be able to cap it with no ill effects. Either way that vaccum port should not be left open. Hope that helps.

Edit: I just went and looked at the S1 RB25 that's in my garage. That open vaccum port on your engine should go to the stock BOV.
Modified by digzsublime at 10:50 PM 5/29/2007

[BlAcK95sE]

1st. Read the manual for the SAFC II where it gives you the maf values for each car. I know on the RB20, mine was originally set to 1in / 4out. with stock maff. With Z32 it should be 2in/4out (on RB20). As far as I know, you should change the "in" setting to 2in. Leave the "out" setting where it was for the stock maff. I could be wrong, and if so, someone here WILL correct me.

2nd. See step one. If your maf settings are wrong on the SAFC, you car can still run. It just won't run right. Your SAFC maf values may be set wrong and that vaccum leak from the port on the maniold may be keeping it running.

Or your maf settings could be dead on. The poor running could be caused by any number of other things. Bad AAC, incorrect base timing etc. The list goes on. Best idea is normally to hook everything up stock and get it running properly before changing anything else. Break out the FSM and find out what that vaccum port goes to. If it is emmisions, you should be able to cap it with no ill effects. Either way that vaccum port should not be left open. Hope that helps.

Edit: I just went and looked at the S1 RB25 that's in my garage. That open vaccum port on your engine should go to the stock BOV.

Modified by digzsublime at 10:50 PM 5/29/2007

we had it set at 2in 4 out and it would not idle and it would runn so rich the car would shut off and go into safe mode! it would idle and run pretty normal with the safcII set to 2in 1out. but it would throw code 12. (MAF)

with 2 in 4 out the car would only idle if that vaccum line was not hooked up. i belive the vaccum port went to the evap canister.

the problem is solved now though we put it on the dyno and with 2in 4out the air fuel ratio was reading 10.0. so after a few hours of pulling fuel the car runs like a top.

[BoostFab]

somebody on this forum has to have this vaccum line ran to something sombody please HELP!

the lower one goes to your blow-off-valve. the one in the picture connects to the black emission canister; block it off if you're not using so you dont have boost leak or vac leak

[nvmysrt1838]

sweet thanks...after taking her to the dyno i got her running fine....z32 maf had her running VERY RICH......she's stock right now at 7 psi........

[treymeiste]

i have mine set to 2 in 5 out and just added about 4% low and high throttle runs great with the hx35 now afr's stay around 11.5 to 11.7 wot, curous tho if you could sent me your exact settings for the 2 in 4 out id llike to try it out