question about raising rev limiter on LS engine...
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From: Evanston, IL, USA
question about raising rev limiter on LS engine...
this question relates to autocrossing primarily. someone was talking to me during the season about changing my ECU which would, among other things, raise the rev limiter. one of the primary reasons i'm considering this is a potential move to race tires, where i'd likely run 235/45/13 on 13x8.5 panasports. since the overall diameter will drop around 2 inches, acceleration will improve, but top speed in each gear will drop. since i can get close to redline in 2nd as it is, and adding additionals shifts during my run will make it more difficult, raising the rev-limiter seemed a possible route to keeping the top end of 2nd close to 60.
i have seen dyno plots of the LS/RS engine (see link below) and power drops off around 6200-6400. is this a function of the computer starting to slow things down prior to redline, or is this the natural roll-off of the engine, indicating little will be gained by raising the limiter? are there potential problems with raising the limiter?
thanks for the help,
phil
i have seen dyno plots of the LS/RS engine (see link below) and power drops off around 6200-6400. is this a function of the computer starting to slow things down prior to redline, or is this the natural roll-off of the engine, indicating little will be gained by raising the limiter? are there potential problems with raising the limiter?
thanks for the help,
phil
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From: assville, MI, USA
Re: question about raising rev limiter on LS engine... (Philbert)
Your not going to be making any power beyond redline, and it can be harmful to the stock valvetrain.
If you want to do this, you really should get cams that breath up high and upgrade your valvetrain.
If you want to do this, you really should get cams that breath up high and upgrade your valvetrain.
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From: San Diego, CA
Re: question about raising rev limiter on LS engine... (Philbert)
The power drop is the natural roll off. Little, if anything will be gained by solely raising the rev limiter. If you raise the limiter, you're putting more stress on the engine than it was meant to handle. Now if you got some stronger valvetrain components to handle the higher rpms, the engine could take it, but you would still not be gaining any power. This is where internals come into play (cams/pistons, etc...).
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From: Evanston, IL, USA
Re: question about raising rev limiter on LS engine... (hybridreams)
The power drop is the natural roll off. Little, if anything will be gained by solely raising the rev limiter. If you raise the limiter, you're putting more stress on the engine than it was meant to handle. Now if you got some stronger valvetrain components to handle the higher rpms, the engine could take it, but you would still not be gaining any power. This is where internals come into play (cams/pistons, etc...).
the problem is that adding cams will bump me to a class where i can't be competitive.
this is the one allowance i can make going to DSP:
Cylinders may be rebored to .0472 in. over standard bore and the appropriate standard oversize piston may be substituted. Cast or forged, non-stock pistons of the same dimensions and configuration as original equipment pistons may be used. Additionally the replacement pistons must be of the same weight or greater as the original equipment pistons.
will this make much difference, or should i just learn how to downshift properly, or just run in 2nd and not have quite the top end speed?
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