can the lt1 stand to be rev'd to the rev limiter? if i got a different cam and head setup that allowed me to rev up to 6500 rpms will the engine be ok without any work to the crank and pistons?

 

Not really a good thing, since the stock rev limiter cuts fuel..

 

Yea its terrible to hit rev limiter, leans the **** out of your motor. For whatever reason the lt1 pcm takes fuel instead of pulling timing.

 

ok so hitting the rev limit is bad. does it hurt the engine? other word will it **** something up or blow the motor?

 

yes it hurts the engine and you risk valve float on stock springs which means good bye motor

 

Shutting off the fuel effectively eliminates combustion. The PCM normally cuts fuel when you coast as well. This will not damage your engine. If you are running nitrous, there is the risk that the higher concentration of O2 in the incoming air charge could provide sufficient oxygen to oxidize extremely hot exhaust valve edges, but in NA operation, cutting fuel is not a problem.

The stock rev limiter settings depends on your tranny type (which we don't know because you haven't set up a "signature"). For the M6, the stock settings are 5,886 rpm in 1st gear, and 5,808 rpm in 2nd-6th.

 

ive rev'd y engine higher than 5800 rpms before it doesn't even seem to hit a rev limiter at 6000 rpms. why could that be? i have the t56 tranny.

 

Have fun over revving it. I suspect a "my car makes a constant rattling noise" thread soon.

 

I too peg my stock motor. I speed shift right about 5900 and it does hit the limiter. This has resulted in my 13.09 @ 106 with the manifolds still on and 145,000 on the clock. AND,,,yes I do have some tap tap tap in the motor but I could still click off another 13.0 anytime without being nervous. The thread starter will be okay to rev that thing.

 

Because the dash gauge is not accurate. If you had a scanner, you would see Injuneer is correct.

Thomas.

 

according to my scannmaster my tach is off by 200 rpm down low and as much as 300 up high..

 

The couple dozen stock 94-95 bins I've seen have all had the same limits (5886/5805) - AT or MT, F or Y body.

 

yea i have a 96 t56 tranny.

 

As injuneer said, N/A it wouldn't neccessarily hurt the engine, but it is not something you want to do often - it is there for a reason. Most people agree that the stock shortblock is good to around 6300 rpms or so, but more then that is hit or miss. After repeated runs to that much rpm some survive, some do not.

The PCM does the same thing when the TPS percent gets to .72 or under to allow engine breaking when you let go of the throttle. It is when there is enough nitrous left to ignite without enough fuel where things can and do break.

 

Nitrous can not ignite without any fuel. Its composed of nitrogen and oxygen, just like air, but with a different mass ratio of nitrogen to oxygen.

The fuel cut on coast is there to reduce emissions and improve fuel consumption, not to provide "engine braking."