Reving past stock rev limiter

Discussion in 'Fox 5.0 Mustang Tech' started by stangboy, Feb 26, 2004.

  1. stangboy Founding Member

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    Hey guys,
    2 of my boys(their twins) just did a heads and cam swap on their 306. they already had a GT-40 intake. They put Trickflow heads and a Lunati solid lift(flat tappet) cam. They can rev right past the stock rev limiter past 7000rpms. I didn't believe it until I drove it myself. They didn't put a chip in it or anythng. The rev limiter worked when they had their F303 in it, but now its like the rev limiter isn't even there. Not like they want the rev limiter but I was just wondering how this could happen. The computer is probably so confused though because it searches for idle. One minute it'll idle at about 1000rpm then it'll go up to about 1500-1800, and it'll come back down to 1200. So, maybe that's why it revs past the stock 6250rpm rev limiter. :shrug: I must say, it sounds wicked as hell. The lope is so rediculous it sounds like the car is talking. :drool: I love it. It actually has me wanting a solid lift cam....it revs so high so damn fast and it keeps pulling. I love it!!
    stangboy, Feb 26, 2004
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  2. noslow5_0 New Member

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    huh mine does the same thing... ive taken it to almost 7 and nuttin... I thought i was the only one with this!!!! o well i love the way my e cam sounds i bet the f is even better!!!!
    noslow5_0, Feb 26, 2004
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  3. 89MustangGX I have nothing productive to add!

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    Without any computer work it doesn't happen. Most likely the tach is just very far off--seen that happen in alot of these cars.
    89MustangGX, Feb 27, 2004
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  4. noslow5_0 New Member

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    well i have both an autometer tach, and the stock one.... The stock one seems a little off at idle, or maybe its a combination of the two....
    noslow5_0, Feb 27, 2004
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  5. 89MustangGX I have nothing productive to add!

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    You got me on that one...it's just not possible to bypass the computer without bypassing the computer? :shrug:
    89MustangGX, Feb 27, 2004
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  6. stangboy Founding Member

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    So, why all of a sudden the thing isn't working? It worked when they had the F303 cam in the motor. But I'm serious, it revs right past 6250rpms like if it wasn't there. I drove it myself. I didn't believe it until i drove the car and saw(and felt) it for myself.
    stangboy, Feb 27, 2004
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  7. Michael Yount New Member

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    The factory ecu limits rpm to 6250. So, either you're not exceeding it and your tach is reading incorrectly (highly likely if your 7 grand reading is from the stock tach), or you are exceeding it and that means the ecu is malfunctioning, or someone has slipped a chip in while you weren't looking.
    Michael Yount, Feb 28, 2004
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