93 Tune - car feels slower.

[NGOT8R]

Weird, not sure why E85 would have anything to do with a fuel pump going out unless the E85 sat in there for a while.
But thanks for the response
You are on a 19 though, wonder if Wengard changed anything on 21

NP. Yeah, I’m not sure on the 21 models if there’s been a change. My car had sat for extended periods with E85 in the tank.but it was in a heated and cooled garage. I wish so could put my finger on the culprit, but I can’t.

I’m monitoring my fuel pressure very closely now though. I did cut the pump open and do a thorough inspection and found that one of the brushes had seized up. If you haven’t seen it yet, here’s the thread on it.

https://www.mustang6g.com/forums/threads/suspected-bad-fuel-pump-2019-bullitt-on-e85.189945/

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[Idaho2018GTPremium]

Okay folks my son has a 2019 GT A10, only mods are Roush CAI and he is running Nitto DRs. He uploaded a 93 octane tune from one of the very well respected tuners and now swears that his car is slower, tuner says logs are good to go. I'm not sure what to tell him do about it?

Have him get a Dragy. They aren't that expensive. No need to run 1/4 mile; could do a 60-130 mph split, or if that's too fast a 50-120 - you just want to get rid of the launch which has so many variables. Start about 10 mph below the split start (e.g., a 60-130 run should start at about 50 mph). Do a couple of runs in the same conditions on the same stretch of road on each tune and compare.