Thread: Creeping afr and timing issue

If the rest of your tune is that dialed in, and your only issue is WOT, gins suggestion would get you there. You can use your scans to see where you need fuel. If you are commanding 12.1 or whatever, and at 8000hz you are seeing 13, just add 2-4% in your MAF table. If you hit 13.3 at 8000 hz all the way to 10000hz, add 4% in those areas and scan again. If you don't know, you highlight all the rows you are modifying, right click and select custom, enter 104 and tick percent.

Originally Posted by gambler87

I've been told by mulitple people the 04+ gtps will max out the maf and injectors before u go to a 3.4 pulley. My stock injectors went static on a 3.4 pulley trying to do a 140% duty cycle at 4,600 rpm in second gear at wot

you got lied to.

not sure about 2. but im not a pro tuner by a long shot.

Originally Posted by ScottyDoggs

you got lied to.

Gotta go the other way here big Scott. You're normally right so this is kinda weird, but on the 04+ gp's the maf maxes out real quick. Same with injectors. My maf was stupid maxed on a cam and 3.3. I'm sure a 3.4 alone would be close to maxing it.

Originally Posted by gambler87

Is this the procedure I should go about doing to get my car tuned in

And I'm no pro, even less sobthan Scotty...but I'm not sure about #1. IFR, IMO, should be calculated based upon injector size. I don't think its one of those things you wanna go tweaking constantly. Every time you change IFR its gonna throw the rest of your tune off. I would get the data right based upon injector size you are using, and tune fueling with MAF table.

Originally Posted by bandook

And I'm no pro, even less sobthan Scotty...but I'm not sure about #1. IFR, IMO, should be calculated based upon injector size. I don't think its one of those things you wanna go tweaking constantly. Every time you change IFR its gonna throw the rest of your tune off. I would get the data right based upon injector size you are using, and tune fueling with MAF table.

Yes. I'm with you guys here. Messing with ifr to change fueling is darkhorizon level stuff. No need to fudge numbers to get it to run well. Tune the maf. It's a long, tedious process but it's the right way.

according to guides ive read. you can tune the injectors via the kpa. if you changed injectors id do this for sure. that guide says if your -12 you subtract 12, but ill tell you not to go full #'s go 1/2 of the number to start. as you can over shoot your goal.

cant say ive ever heard of a 3.4 making a gen 5 out flow stock injectors and maf. that just dont sound right at all. cause people do 3.4's on gen 5 all the time. and injectors and tb and maf are not on the supporting mods lists anywhere ive seen.


i was in a regal with a 3.2 ssic stock maf and injectors, car ran fine. not even a fuel pump rewire or nothing. granted its a gen 3 blower, but its on a 3.2.

that guide i emailed you has a chapter on the ifr tuning. its easy.

Which guide you talking about? Is it one in Bills db?

if not done already, start over. all back to stock files or last known working files if you have them still, let the trims learn. then scan and work the injectors.

then let the trims re learn again, then check the injectors again. once your happy trim wise start the maf tune.


and that zzp pe file makes a difference in your fuel trims too.

Originally Posted by bandook

Which guide you talking about? Is it one in Bills db?

it not in bill drop box. it reads a lot like jerrys, but has more info. ill email it to you if you like. its for dhp.

Please do. Ty

what your email? pm me it if you like.