[ssmike]

Originally Posted by RobbyBeefcake87

It's stock, with GM CAI and the MAF recalibration. The first time it happened I thought I just hit fuel cut off because I was really close to redline and sometimes the HUD tach isn't the most accurate. The next time it seemed like maybe I hit fuel cut off again but wasn't sure, but the third and last time it happened I was only in the high 120s not at redline. I can't imagine the speedo can be that far off.

I only had the code read the first time, it was a fuel pressure commanded vs actual code which made sense if I hit fuel cutoff. The 2nd and 3rd time I did not get the code read, just turned the car off and back on and it was fine. Also when I went to get the code checked again a few days later they told me they couldn't read it after it's gone because the car doesn't store them, which is news to me.

Regardless I took it off when I went to get it checked out the second time and now I'm leaving it off to confirm that it was the issue. I did one pull to the low 130s and it was fine, but it also didn't always do it so the jury is still out.

I do know that people with GM CAIs have said it's got rougher MAF readings so maybe the Velossatech and GM CAI don't like to consistently play nicely together. I did clean my filter out recently so I might go back in there and make sure the MAF clocking didn't get skewed (another GM CAI feature I don't like). After the 2nd time it went into limp mode, I ran personal bests at the strip (was on my way there when it happened and I knew from the previous time that after turning it off and on it'd be fine) so I don't think there is actually anything wrong with the car, just the MAF signal.

Right now I have the block off deflector off so I imagine some of the Velossatech advantages are still at play vs deflector still on.

Fun fact, after it happened I still raced it at the strip to the surprise of some on my convoy because the car is under warranty and after it happened the first time the dealer didn't bother digging into it and said it was fine after I explained I hit fuel cutoff and the code was fuel pressure related, they chalked it up to an error. So I said **** it and raced anyways, that's what track warranties are for lol

My car is FBO so it has a tune but it’s getting re-tuned in the Spring for e85. Hopefully the tune will prevent what you were seeing. I have a RotoFab which should play nice with added air.