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Don’t know about the Roush cars tunes are different from the kits being installed on the regular cars. As of yesterday Lund is still saying they are not tuning fi setups on 2021 mustangs due to the new pcm.

I to am having some issues that where there from the beginning of install. My complaints are low horsepower some harsh shifting and a rough cold start idle that I think is a miss that can be heard through the exhaust. I had a dyno done and sent it to Roush but they could not read the run file...

And here is the instructions for the dealer on how to upload the file.

Those pids listed are what’s needed by the dealership to send to Roush. this can be done on a dyno or on pull on the road is what they told me.

Here you go straight from the Roush team.

When I was pricing out all the different kits that had a warranty for my 2021 Roush was the only one. Whipple told me they would be offering a warrantied kit later in the year. Eddlebrock told me they were waiting for the carb approval and would also offer a warranty later in the year. This was...

May 21

Roush told me 18% on the auto. I may be wrong but I thing std reads a bit higher than sae

520 What gear was you in as well? Im not smart enough to know the conversion of what mine put down in 7 converted to 5th would be like Roush wanted.

The 18-20 yeah do run those numbers. I have yet to see or hear a 2021 run that high.

What kind of dyno and correction and fuel? Do you happen to have the graph? That’s the highest reported hp of a 2021

I feel the same way with the low power I’m experiencing and some drivability issues I’m having. Hopefully they will get it fixed.

Ned to call Roush and complain so we can get a trail going with them. min my opinion there are still issues with the 2021 tunes.

Matt what gear did they dyno your car in?

Correct only lets you take full advantage of the power you have. It will not derate power based of rising high iat2 temps the Roush kit is known for.

Wotpulls you are correct just got a txt from the installing dealers performance manager that Roush wants 5th gear pulls. First I had heard of this.

Is this stated somewhere from Roush. First I’ve heard other than 1 to 1. I have been in contact with Roush they have the dyno graph. The did say it’s down on power and the rpm was lower but never mention for me to run it in 5th.

This is a phase 2 kit and you are correct on power. This is why the dyno was done I’m in talks with the dealer and Roush to try and figure what’s going on with the 2021 kits and the reported low horsepower. I personally know of 4 kits that have pull lowered than expected hp. While talking with...

Vmp and palm beach dyno showed improvements over the Roush tune. What tuner will do a flex tune on a forced induction vehicle I haven’t heard of any who will? A flex tune will more than likely need a fuel system upgrade as well.

Matt im almost certain we have the same tune. The tune you got I got the first when it came out. My car was at the dealer waiting on Roush to release it. I was in constant contact with the dealer and Gavin for this tune release. The tune that is on my car is the very latest from Roush.