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Discussion Starter · #1 · (Edited)
Hello,
Looking for some advice. We but together a 2015 3.5 twin turbo with a 3.7 manual 6-speed into a 97 cobra. We utilized the control pack from frpp and everything seems to look good except the motor will not rev past 4000 rpm. Not sure what to do. It’s got new coils and plugs and everything appears to be hooked up. Sounds and runs clean until you get to about 4000. It will do this in the driveway and under load. Any thoughts would be greatly appreciated at this point.
Thanks
Pat
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Is this limit while you are revving the engine while stopped?

If so, the stock EB PCM limits how far you can rev the engine in neutral to around 4,000 rpm.
 

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Discussion Starter · #4 ·
It will do it in neutral parked or under load driving. This engine has the ford Racing control pack computer and harness. I do not believe it has that safety feature built in.
 

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2021 Powerboost Platinum FX4 Kodiak Brown
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Since that control pack is likely extensively altered from what us "normal folks" are running, I don't know how much expertise you will find here.

An obvious question after glancing at what little documentation that I have found is "did you install a returning fuel system?"

I saw that requirement mentioned multiple times.

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Discussion Starter · #6 ·
I did. I’m running out of ideas. I’m hoping someone on here may know something.
 

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Here ya go
It appears you have one of those that "got out with that limitation"?

Good news is that there's a fix! And you don't have to chase that rabbit anymore. That musta been brutal


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2021 Powerboost Platinum FX4 Kodiak Brown
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Unreal. Thanks for the info. I’m on it
Can you do US a favor?

Come back after you have that wicked machine sorted and tempt us all? :)

Details. We want pictures! Lol

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No idea where you are from or plan to race, but sure would like to see it! I'm a regular at Road America.
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