Removal of the Rev Limiter
Now, I realize I'm just chasing my tail here because I have a v6, but I was wondering if there is anyway that I can just take out the rev limiter. Instead of stopping at 4,000 rpm standing still, I was wondering if there was a way to break that, and hit 6,000? If so, please help. If not thanks for trying. Main reason for this, is at shows, instead of stopping at 4k, it would sound better at 6k now that i have a different muffler on.
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http://www.americanmuscle.com/x3-cus...er-0510v6.html
That will do it, it's a tuner. Get tunes for it too and you'll have a whole new car on your hands ;) |
+1 on needing a tune/tuner to get rid of that....
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The factory setting on the 4.6L is 6250 PRM. I have mine at 6500, down from the 6800 that Brenspeed set it at. But I was pretty sure the 4.0's factory rev limiter setting is higher than 4k...
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I wouldnt want to rev higher than 4k in neutral.
There's no load on the engine. My rev limits are Neutral 4000 , Drive 6150 But yes you can raise the neutral rev limiter with a tuner. |
Originally Posted by Nuke
(Post 8343141)
The factory setting on the 4.6L is 6250 PRM. I have mine at 6500, down from the 6800 that Brenspeed set it at. But I was pretty sure the 4.0's factory rev limiter setting is higher than 4k...
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The Neutral Rev Limiter is there to keep you from floating a valve either from just sitting there reving the engine at a stop light that high (like an idiot) or if you miss a shift... Ever floated a valve that hits a piston? It's not pretty, it will take the cylinder, the valve(s) that get hit and possibly blow a head gasket.
When the engine is not under load and just reving, there's no momentum/inertia to make the valves close faster so you end up with valve float... If it happens at just the right time, it smacks the top of the piston and that's it, you are done. Unless you have strong valve springs I would never mess with the neutral rev limiter (raising it). |
Originally Posted by Derf00
(Post 8344935)
The Neutral Rev Limiter is there to keep you from floating a valve either from just sitting there reving the engine at a stop light that high (like an idiot) or if you miss a shift... Ever floated a valve that hits a piston? It's not pretty, it will take the cylinder, the valve(s) that get hit and possibly blow a head gasket.
When the engine is not under load and just reving, there's no momentum/inertia to make the valves close faster so you end up with valve float... If it happens at just the right time, it smacks the top of the piston and that's it, you are done. Unless you have strong valve springs I would never mess with the neutral rev limiter (raising it). |
Originally Posted by 2005Redfire6
(Post 8345057)
I am sure that is the case with some motors, never heard of that out of the 4.0, 4.6, or even the 5.0 though.
The rods in these cars are weaker than the valve train so yes, it is not likely to happen to these cars. It is still possible. |
Originally Posted by Derf00
(Post 8344935)
The Neutral Rev Limiter is there to keep you from floating a valve either from just sitting there reving the engine at a stop light that high (like an idiot) or if you miss a shift... Ever floated a valve that hits a piston? It's not pretty, it will take the cylinder, the valve(s) that get hit and possibly blow a head gasket.
If the valve is hung open far enough when it gets "kissed" . . . ↓↓↓ http://www.njstangers.org/members/no...piston-web.jpg http://www.njstangers.org/members/no...ad-section.JPG That bent valve stem in the first picture belonged where you see a "good" exhaust valve in the head section picture. Pieces of the missing valve head took out the missing stuff in the red circles on its way to wherever it ended up at. A few bits are embedded in the top of the piston Water will pour into the cylinder, hydro-locking it (which bends rods) and the sudden quench will probably crack the cylinder wall in addition to the above damage. Norm |
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