2014 Camaro SS - LTFT

[Alex14SS]

So ive tried tuning the MAF sensor but my VE is disabled but I seem to get terrible LTFTs. here's my log. if anyone can help me out would be appreciated jt log.hpl

[GHuggins]

Looks like you either have bad injection timing or a vacuum leak. Bank to bank is off pretty bad at idle and then comes back in line with more rpms. Once that's fixed use stft's + ltft's to tune in your tables.

[Alex14SS]

Looks like you either have bad injection timing or a vacuum leak. Bank to bank is off pretty bad at idle and then comes back in line with more rpms. Once that's fixed use stft's + ltft's to tune in your tables.

Thanks for the reply, I do have a 103mm throttle body as well that was somewhat calibrated with the scaler but I'll take another look at the hoses for a vacuum leak. My injection timing was never calibrated or anything upgraded to the injection system. Maybe a bad fuel injector?

[GHuggins]

It's possible. I just assumed you had a cam with larger injectors and hadn't dialed it in. Fix the bank to bank and go from there.

[MeshaalMMT]

is this cammed or ghost cammed tuned? whats done to it? it looks like the underspeed and overspeed are going crazy making it missfiring and affecting the fuel trims. turn off LTFT and get the vve dialed then maf if you wanna turn LTFT back on.

[horsepowerguru427]

is this cammed or ghost cammed tuned? whats done to it? it looks like the underspeed and overspeed are going crazy making it missfiring and affecting the fuel trims. turn off LTFT and get the vve dialed then maf if you wanna turn LTFT back on.

Ghost cams are the new cams. this generation is crazy, wanting cams for just the sound alone lol

[Alex14SS]

is this cammed or ghost cammed tuned? whats done to it? it looks like the underspeed and overspeed are going crazy making it missfiring and affecting the fuel trims. turn off LTFT and get the vve dialed then maf if you wanna turn LTFT back on.

This has a small cam in it & I added a bit to the under speed and overspeed for it to be a bit more aggressive. also, I'm on a MAF tune and Im not sure if I should retune the VE since it's not being used. I'm not too sure.

[Alvin]

VVE should really be tuned. It really makes a big difference.

[Alex14SS]

VVE should really be tuned. It really makes a big difference.

I?m on MAF only by a dyno tuner I went to, should I turn VE on? Or just leave it off and tune where the tuner left it? It essentially only work for about 300RPM in the 2k range from what I can see then it?s off. But I?ve seen other posts on how some parameters are still basing off of VE.

[GHuggins]

The way the ecm works is it will use the VE as a weighting factor even if it's setup to be 100% MAF. Such as when you're steady throttle, VE will still be used only minimally. Now the other side of that - anytime the rpms are changing more than 50 rpms the VE weighting leans more heavily towards the VE side of things, such as if you have a cam lope at idle - it will use more of the VE as the rpms are changing rapidly. Anytime you stomp the pedal, it'll lean more on the VE air model for controls. It needs to have all of these tables dialed in.

[Alex14SS]

The way the ecm works is it will use the VE as a weighting factor even if it's setup to be 100% MAF. Such as when you're steady throttle, VE will still be used only minimally. Now the other side of that - anytime the rpms are changing more than 50 rpms the VE weighting leans more heavily towards the VE side of things, such as if you have a cam lope at idle - it will use more of the VE as the rpms are changing rapidly. Anytime you stomp the pedal, it'll lean more on the VE air model for controls. It needs to have all of these tables dialed in.

Thanks for the explanation! I?ll get that dialed in & hopefully, I?ll get some better performance too, I have a bigger throttle body, e85 kit (sensor) since my last VE calibration at dyno.