Need some help with MAFT/ SAFC

[91 TSi GP]

So I'm having some issues and am hoping that someone will be able to help me out. I used to have dsmlink and my car was tuned perfect, well something came up I had to sell it. In the meantime my Eprom took a shit on me so now my tuning setup consists of a Non-Eprom, SAFC, AFPR, Wideband, datalogger, and MAFT.
My car will start up decent and idles pretty strong. I can rev it while its idleing and it revs up nice and everything. I have my "Base" Setting set at "6" on the Translator. Everything else is at 0. I have everything set at 0 on the SAFC. As soon as I'm in gear and trying to go I have alot of hesistation/ bucking/ and backfiring...
I hate tuning and am trying to get my car "driveable" to break in my clutch and have someone tune it for me.
What am I doing wrong??? What should my Throttle Points be set at? I need some serious help, Is anyone close to youngstown ohio and wanna come help?!

Any help is appreciated.

My setup is..
t57, 680's, 255lph, front mount, 3" gm maf/ translator, afpr, open exhaust, 2.5" hard charge pipes.. 17psi

 

[JayRolla]

Well if everything was running fine before, then maybe something is wrong with the wiring of the safc or maf-t. Do you have a wbo2?

 

[91 TSi GP]

Well if everything was running fine before, then maybe something is wrong with the wiring of the safc or maf-t. Do you have a wbo2?

I have checked rechecked and checked the SAFC wiring, the MAF-T has been installed ever since I have had the car and I havent touched that. And yes I have a wideband

 

[my98gsx]

I ran this type of setup for many many years, ( ie; 650cc, safc2, fpr, maft ) What you should do is read the maft instructions - set the translator to your base injector settings, in your case the 660's. I have never used the wot setting i left them on zero. Now that your translator is set for your injectors only, the car should run pretty well, the translator does a decent job. Now look at your wide band readings to see if your running rich or lean. Use the safc to fine tune the maft to the proper afrs. The fuel pressure should be around 36psi. The injectors you are running should work fine with your setup, they are not so big that you cannot control them. But make sure your maft is set to your injector size ONLY - no WOT this can cause lean or rich spikes which can make the car buck and loose power.. You have all the tools go make a nice tune, the wideband is going to tell you everything.

 

[JayRolla]

What do the afr's do when you start to accelerate?

 

[91 TSi GP]

I ran this type of setup for many many years, ( ie; 650cc, safc2, fpr, maft ) What you should do is read the maft instructions - set the translator to your base injector settings, in your case the 660's. I have never used the wot setting i left them on zero. Now that your translator is set for your injectors only, the car should run pretty well, the translator does a decent job. Now look at your wide band readings to see if your running rich or lean. Use the safc to fine tune the maft to the proper afrs. The fuel pressure should be around 36psi. The injectors you are running should work fine with your setup, they are not so big that you cannot control them. But make sure your maft is set to your injector size ONLY - no WOT this can cause lean or rich spikes which can make the car buck and loose power.. You have all the tools go make a nice tune, the wideband is going to tell you everything.

Ok I checked all this and have it set up correctly, Interestingly enough my afr at idle is 10.__, it stays super rich throughout rev and will lean out as soon as i release throttle obviously. Well when I go to move it just bogs out and in order to start it again I have to hold the gas to the floor...
Any ideas?!

 

[turbotalon31]

im having the same issue wb sits at 10 at idle and stays rich thru redline almost the same setup except for an eprom chip from dsmchips if you dont figure it out before friday i should have mine setup by then ill post my findings

 

[91 TSi GP]

im having the same issue wb sits at 10 at idle and stays rich thru redline almost the same setup except for an eprom chip from dsmchips if you dont figure it out before friday i should have mine setup by then ill post my findings

awesome, ill keep you posted, you keep me posted!

Ok, I just thought of something...
When I installed my AFPR I dont think that I had the vacuum line off when I set the base fuel pressure. Would forgetting to do this cause my insane rich idle?

 

[turbotalon31]

its possible the vaccum line off the fuel regulator could cause a rich idle as far my settings go my maft is set on 2 for 450 stock injectors (keep in mind i have a chip for the 680cc ) and the afc is zeroed for now cant drive the car yet no brakes just found that out today ill keep u posted

 

[91 TSi GP]

reset the fuel pressure tonight, messed with the idle on the maft and it drove down the road without bucking / hesistating/ and backfiring! now just to figure out how to tune this!

 

[JayRolla]

Ohh yea that can do it. Just a little change is fuel pressure changes the entire AFR across the entire fuel map. Glad you figured out the problem. If running pump gas I would start at a rich AFR around 10.9. Then pull some timing out. I liked around 14-17* up top depending on boost I was running and if I had no knock. Then add boost untill you knock. Just remember less timing and more boost always makes more power than more timing and less boost.

 

[my98gsx]

when you start tuning, tune for low throttle everyday driving. Since there is two settings on your safc, dont worry about the performance tune... get the car running and driving perfect for around town. Once you have your 14.7 tune for the street, then do your full throttle pulls and pull fuel until you hit your goal of 11.7 on full throttle. ( unless you have meth then i would shoot for 12.0 ) Have fun with this as long as you dont go too lean it shouldnt be a hard tune to do yourself.

 

[91 TSi GP]

Thanks for the input guy i appreciate it

 

[my98gsx]

n/p anytime

 

[JayRolla]

when you start tuning, tune for low throttle everyday driving. Since there is two settings on your safc, dont worry about the performance tune... get the car running and driving perfect for around town. Once you have your 14.7 tune for the street, then do your full throttle pulls and pull fuel until you hit your goal of 11.7 on full throttle. ( unless you have meth then i would shoot for 12.0 ) Have fun with this as long as you dont go too lean it shouldnt be a hard tune to do yourself.

11.7 afr on pump gas. Man that is lean IMO. I have never had good results leaner than 11.1 on pump gas but to each his own I guess.

 

[my98gsx]

11.1???? wow thats rich, where did you come up with that number???

 

[Jiggalude]

Yea I'm curious about that as well. My AFR gauge won't read past 10.0. 11.1 seems very rich.