Hitting rev limiter with Dry shot......
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Joined: May 2002
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From: one step ahead of you
Hitting rev limiter with Dry shot...... Our cars cut fuel on the limiter, so what harmfull effect will rev limit aka fuel-cut have on a dry shot? If there is no fuel in the cylinder, there should be no cumbustion and the nitrous should pass on thru the exhaust. Is this thinking correct or am I missing something here?
Originally Posted by Y2K2LS1
Our cars cut fuel on the limiter, so what harmfull effect will rev limit aka fuel-cut have on a dry shot? If there is no fuel in the cylinder, there should be no cumbustion and the nitrous should pass on thru the exhaust. Is this thinking correct or am I missing something here?
FormerVendor
Joined: Apr 2005
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From: Wichita Falls,Tx
Even though the car cut's fuel when hitting the rev limiter you are still at wide open throttle, which means you are still spraying nitrous into the motor. So for a moment you have a build up of nitrous that isn't being used, and once the fuel table returns to normal you now have a very very lean condition that can ignite. Keep in mind that this all happens within milliseconds.
in theory when its hits the rev limiter the sequential fuel injection system is cut on that cycle and NO fuel will enter the intake and combustion chamber on each cycle on each cyclinder as its cut. The computer will cycle off and on as the rpms fall to below the rev limiter again and fuel is activated. That when you heare the bah-bah-bah for a few cycles Again in theory that would not be a problem since there would be no combustion and you cant run lean if there is no fuel and no combustion. However in practice I dont believe that to be entirely true. I think possibly with reversion or just residual fuel there may be a few cycles that are incredibly lean. On engines that have a lower total power...like say a stock LS1 with a 100 shot dry...I doubt its still to big a deal as far as catastrophic damage but its not a good thing either. But on larger dry shots and engines that have large cams that have more reversion and a more "dirty" combustion I think it would be more of a problem. This is just my opinion thinking out loud.
Besides the theory...I have persoanlly melted plugs on a dry shot hitting the rev limiter more than once.
Get a window sitch
Besides the theory...I have persoanlly melted plugs on a dry shot hitting the rev limiter more than once.
Get a window sitch
A buddy runs a dry Z06 and no ws, he hits the limiter all the time. Like Al said it's really not a problem with the smaller shots (done it myself on '97), but still why take a chance, get a ws.
Robert
Robert
This is one of those instances where the dry system is safer.
People hit the limiters all the time with dry systems without a problem, but you should always keep an eye on the plugs. Hitting the limiter will slow you down and is best avoided.
People hit the limiters all the time with dry systems without a problem, but you should always keep an eye on the plugs. Hitting the limiter will slow you down and is best avoided.
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Thread Starter
TECH Apprentice
Joined: May 2002
Posts: 338
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From: one step ahead of you
Originally Posted by 383LQ4SS
However in practice I dont believe that to be entirely true. I think possibly with reversion or just residual fuel there may be a few cycles that are incredibly lean. On engines that have a lower total power...like say a stock LS1 with a 100 shot dry...I doubt its still to big a deal as far as catastrophic damage but its not a good thing either. But on larger dry shots and engines that have large cams that have more reversion and a more "dirty" combustion I think it would be more of a problem. This is just my opinion thinking out loud.
Besides the theory...I have persoanlly melted plugs on a dry shot hitting the rev limiter more than once.
Get a window sitch
Besides the theory...I have persoanlly melted plugs on a dry shot hitting the rev limiter more than once.
Get a window sitch
Thanks for the inputs guys.
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another you can do is raise your limiter a little bit. then your less likely to hit it, but will still save egine. I raised mine to 6800 to help avoid hitting from the standard 6600.
Robert
Robert
