Dyekid04

after a HCI swap on my 06 C6 M6 LS2, vengeance ported Fast 102 NW 102 Pfadt 1 7/8 , Borla ATAK, TSP stage 2.5 ported 243's tick stage 2 street heat cam package holley EFI fuel system and Z06 fuel pump. ive had the swap done about 2 months now and has been dyno tuned and runs fairly well. but the car seems to hit a "wall" around 140. the stock bolt on setup pulled to 180 without and issue. i always have the same 5 codes pop up "p0016" "p0106" "p0107" "p0121" "p1101"

car has been re tuned this weekend for the new rails and injectors . tuner seems to think my stock Map is bad bc that code continues to pop up the most . he has been running into issues tuning the 02's so we just tuned on speed density to get it by . Anyone else heard of the issues? i was doing some reading about 2-3 bar maps and maybe changing the MAF since they are both stock but im at a stand still as of know

schpenxel

Can't hurt to swap out the MAP for a new one--they are cheap and easy to change.

You really need to get a log of it happening if it keeps happening after you install a new MAP, but it's quite possible most of those are being caused by airflow and MAP correlation tables not being setup correctly. It's simple enough to disable that possibility in the tune just to see if that's the problem or not (though not safe IMO to leave it that way unless you like Toyota's with auto cruise control )

Also, O2 sensors and SD mode are two entirely different things, so I hope the tuner knows that... SD vs MAF modes are different ways airflow is calculated. Open loop or closed loop mean you aren't or are using the O2 sensors for fuel corrections. Two very different things.

Dyekid04

yea a few tuner savy buddies of mine say that they think the " airflow tolerances" have not been opened up enough or adjusted correctly . we were doing dribing and pulls with the car on 02's and the car felt A LOT better drive-ability wise to me. with them disabled now and running off the MAF alone i feel like i get some flat spots and a hiccup every now and then . he was having a issue for the first 20 seconds on startup not getting it to go to the correct AFR untill it ran a min . so he got tired of fighting it told me to replace the MAP and bring it back he will reflash it and turn the 02's back on . Does that sound normal? i can tech any car and ive done all this work myself but when it comes to tuning i have stayed FAR FAR away LOL and am a bit dumb to it haha

schpenxel

I'm kind of wondering if he should be tuning your car to be honest. I think your friends are right about the airflow correlation or tolerance tables not having been updated... tuner should have known that for sure though.

So it ran better with O2's on or off?

In MAF or SD?

Those are two separate questions..

Dyekid04

As far as performance goes both the same I believe, but on 02's the car drove like absolute butter. And he mentioned having to turn off something and basically have it run solely off of MAF? Maybe VE table disabled or something?? He is a huge Mustang tuner for our area and tuned a tune of LS's here he specializes in FI applications and he came recommended. He said he would scale them up somemore im
Not sure if he did.

schpenxel

I'd have to see tune and logs to get a better idea what's going on

Replace MAP first and see how it does is what I'd do

Dyekid04

Yes sir, he said my MAF wasnt being Maxxed out yet so stock was ok. You recommend upgrading it anyways? I mean hell map and MAF are both 10 years old ����

schpenxel

There's nothing worth upgrading to MAF wise IMO, the stock one works fine. Some guys are running it at over 1000rwhp.

I'd just replace the MAP with a stock part and clean the MAF if you want while you're at it.. and then see what happens.

Dyekid04

stick with the standard 1 bar LS2 style one or should i be looking into a 2 bar atleast?

schpenxel

Standard. 2 bar is for boosted setups.

Dyekid04

right on , i was wondering if the LS3 or LS7 MAP and MAF were any better or worth upgrading to while im replacing them ya know?

schpenxel

Nah just replace MAP with whatever is already on there. Nothing better about LS3/7 parts for your setup.

Dyekid04

Ill have it swapped tommorow, and get back with you! Thank you!

sevinn

Nothing more to input here than info you've already gotten I just want to backup what schpenxel and your friends have said about the maf/map correlation not being right. I'll bet when you replace the sensor you'll still have the same issues. The nw102 lets more air in per throttle open % so that needs to be corrected properly; that's probably the bulk of your issues honestly.

Dyekid04

Yea im hoping , its running strong as hell and put down 506 hp with 462 TQ last month. And ive ran a HCI ls1 RX7 and a bolt on pro charged 5.0 last weekend and made slight work of them. So it might not be hurting me maybe just tripping a light. Or maybe there is more POWWAA available lol. Replacing the MAF and MAP since they are both cheap and driving it back to him so he can retune tommorow and go from there. Hope all goes well!

sevinn

Good luck. Chances are it's making the power that it will make. Tuning for hp is the easy part, driveability is the hard part and that includes keeping the check engine light happy.