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Creeping afr and timing issue

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
 


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.
 
Thank u bandook for explaining it in better detail. I will be doing everyone's tricks in order to get this thing tuned in by Sept 11th so I can go racing. U guys are always very helpful every time I ask a question
 
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Is this the procedure I should go about doing to get my car tuned in
 


ScottyDoggs said:
you got lied to.
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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.
 
gambler87 said:
3c3bfaa505019f66bb0a536a4f126b44.jpg


Is this the procedure I should go about doing to get my car tuned in
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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.
 
bandook said:
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.
Click to expand...
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.
 
The only time I mess with IFR, is when I change injectors, or running E85. Sometimes you have to adjust that when you KNOW that it's the fuel that needs to be tweaked. Anything more than +6 is probably fixable via the IFR, otherwise it's gonna be better off tweaking the MAF table, like putting on different intakes etc.
Keep in mind...when you mess with the MAF table too much, it causes idle issues, dirveability issues like funny and delayed shifting. The less you have to jack with the settings the better off you are.
 


I will be tweaking the IFR table because I put in 42# injectors. I didn't know that u can change the IFR table to help get the fuel trims corrected. I was having the maf table do everything.

After the fuel trims get close with changing the IFR table, then I will tune in the maf table. Then onto ignition and hopefully it will be done
 
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.
 


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