C4 rev limit
Le Mans Master
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From: St. Charles MO
A C4 with what engine? An LT4 is factory redlined at 6400rpm. ZR1s are probably higher than that. But L98s might not even be capable of reaching that speed, and definitely wouldn't be safe there!
Last edited by MatthewMiller; Dec 28, 2016 at 05:58 PM.
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IIRC, L98's redline somewhere in the 5k-5200rpm range. LT1's redline at 5800rpms. I suspect the only limitation to the LTx cars relate to the rotating assembly. By contrast, the longer-tubed L98 intakes actually create negative pressure on the rods. That's because they can't pull air fast enough above redline...which means they are being "held back". This creates undue "counterforce" on the pistons/rods.
Also, I'm thinking the rev limiters in each would allow the engine to spin higher than redline -- though you really wouldn't want to do it for long.
Le Mans Master
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From: St. Charles MO
Also, I'm thinking the rev limiters in each would allow the engine to spin higher than redline -- though you really wouldn't want to do it for long.
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From: Glenbeulah Wi
There is no rpm limit on the L98 in the computer, mechanically it can hande 6000 rpm but it will not make any power at that rpm. Shift a l98 by 4700 rpm for best performance, lt1 by 5600 rpm for best performance, and a LT4 by 6000 for best performance.
Last edited by bjankuski; Dec 28, 2016 at 06:33 PM.
Le Mans Master
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From: St. Charles MO
I've spun my lt4 up to 6500-6600 and didn't hit a Rev limiter unless the tach is slightly off.
Last edited by MatthewMiller; Dec 28, 2016 at 09:38 PM.
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From: Glenbeulah Wi
Last edited by bjankuski; Dec 28, 2016 at 10:47 PM.
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Correct the L98 uses a fuel cutoff set at 10,000 rpm, which it will never ever reach. It does not have a true rev limiter (which cuts spark).
Le Mans Master
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From: St. Charles MO
Even my LT4 doesn't have a spark cutoff. Like the L98, it just uses a fuel cutoff, but it is actually set at a useful speed. It's interesting that years before, GM had ECMs with capabilities that they didn't actually use until much later.
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From: Glenbeulah Wi
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From: Glenbeulah Wi
Some of the newer drive by wire cars limit the RPM by closing the throttle at the rev limit.
Le Mans Master
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From: St. Charles MO
Good point. It would probably also play hell with catalytic converters, too.
Melting Slicks
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I know as others have stated that the L-98 has a 'rev limiter' set at 10,000 RPM (which is useless!) from the factory. No idea why it was not set at a reasonable RPM.
However, if you are getting your prom 'burned'/programed you can have your tuner set the Fuel cutoff/rev limiter at what ever you want. I just got a new tune and had mine set at 5,600 RPM to keep me from accidentally ever over-reving my engine.
However, if you are getting your prom 'burned'/programed you can have your tuner set the Fuel cutoff/rev limiter at what ever you want. I just got a new tune and had mine set at 5,600 RPM to keep me from accidentally ever over-reving my engine.