CTSV2 Rich when in PE

[C7vette2014]

Just bought this car, its a 2010 ctsv m6. Has long tube headers, cooling mods, 2.44 pulley, ported blower, 1000cc inj, and E85..... just bolt ons.
Old Owner told me the car was tuned by patg. The only thing i changed was the Cold air intake to a "Air raid" CAI. The old intake was a cobbled 4 1/2 inch tube with a filter on it. I also changed the hptuners software OS because i read it supports 2 bar and up or something like that.

So i did retune the maf using STFTs because of the new intake. I did not do WOT tuning because i really dont know how to do it without a wideband. The car has a wideband, its just not being logged through the scanner. So everything is "real time" so to speak.

Now on to the problem, whenever i give it a little pedal, It enters into PE mode and it bogs and has no power, almost like its a misfire. When i look at my WB, it says like 9.0. obvioulsy way to rich. Im thinking thats the culprit. This is my first tank of E85 also. When on 93 it was around 10.3 ish, but it never bogged down like it is now. I could take some fuel out through PE but i dont think thats the right way because PE is showing 1.28 which is around 11.4. So adjust the Maf curve? but how to do it accurately ?

Any help appreciated

[edcmat-l1]

Post a data log even if it doesn't have the WB in it. Need to see what it's doing. And whose "1000cc injectors"?

The target PE is fine like it is. To lean it out you'd lower the MAF and VE where you want to remove fuel.

[Alvin]

This is a MAF tune still. Those 4 inch intakes changes the MAF reading by quite a lot so that is going to require a pretty massive retune to the MAF calibration.

[C7vette2014]

Yeah, the owner told me theyre fic 1000 injectors. I turned off SD and it seem to not bog/lose power. Ran a little leaner (around 10.1). Ive been adjusting the maf more as well....and seem to got it running like it was, still have VE disabled. But wot is now in the 11s. Its really hard to drive wot and look away from the road to watch what your afr gauge is doing. Lol

[abc]

Its really hard to drive wot and look away from the road to watch what your afr gauge is doing. Lol

That's why you take the time to wire up the WBO2s to log it.

[sgod1100]

I'd get all of the E out of the tank and fill up with regular pump until you are at the normal "pump gas" e levels (10-12ish%). Retune while on pump and THEN put some E back in. (assuming you have FF sensor). I've always tuned the maf/vve the "old fashion" way and disabled each one to tune the other and have good luck doing that. I too have an m6 ctsv with similar type mods and haven't had the issues you are experiencing. More than likely you just need to remove fuel from your maf. Also, these cars have a lean spot at around 2600ish rpms that really can't be tuned out and many tuners will just dump fuel in those areas. What ends up happening is if you hit those Hz cells at different rpms other than 2600 you will be very rich. Look up "ctsv 2600 lean spot" and you will see a thread i created years ago about this problem. Root cause ended up being the fuel rail.