I DO NOT PLAN ON RACING MY TRUCK. Im simply saying the pcm's already been programmed, but i'll let it shift normally. It's not a vette lol. Its not a 454. Iget no joy out of using 30 yr old technology. except my pc its an old apple pc, it doesn't even use windows.

 

The fact is that if you rev much past the power peak in any car, you're not accomplishing much or accelerating very fast. The time lost due to slow acceleration after you pass the power peak is generally not going to be recovered by having the next shift drop the engine into some (imagined) spot in the power curve.
You lose time one place or another, but revving the motor higher than it's designed to is just asking for premature wear and engine trouble.Torque generally peaks at much lower RPM than HP, and in the Vortec V6 the peak is about 2800 RPM. The HP peak in this engine is reached at 4400 RPM. The way it adds up - after 5000 RPM what you're doing is mostly revving to hear it rev. IMO, without a planned and integrated set of engine mods, raising the rev limit to 6200 RPM is pointless.

 

I completely agree! Believe it or not. It's too late for that though. I made a mistake on the of moving the redline to 6200. Thats actually why i was asking. I am not going to mod the engine to any extense that would enable it to rev any higher actually. I don't want it to rev past the where power it becomes useless. My goal with pcm was timing and afr, among other things. Now that i look at my calculations i see clearly that after about 5k power, and torque fall off more dramatic than previously thought by me. Just for the record, i sent as i made my first post here. i emailed the guy on the rpm side of things without any answers also. p.s. i am admiting i was wrong the vortec in my case will not be any good, as in reving it higher.

 

You can get cams that shift your power band, so it could theoretically produce power PAST your redline, and if you're running forced induction, the more RPM you make, the more power you'll get.

Nascar engines are made to breath like crazy at high RPM, because that'll make the car go faster (turns the transmission faster) The reason they shift at or near redline, is because they're tuned to have peak power close to redline...

And when you change gears, you don't want the RPM to land ON the peak power, then power falls off without much use... you want your RPM to fall just UNDER peak power on a shift...

 

I don't know why you feel the need to be sarcastic guy. Is there some bad feelings here? I'm sure that most of us are well aware of the fact that the 4.3L V6 has the same bore (4.0") and stroke (3.48") as the 350 CI V8.Yes 6 is 3/4 of 8 so....am I missing something? And the OLD 4.3 (early -to-mid eighties)is built like the OLD 350....the NEW 4.3 is built like the NEW 5.7 not like an old 350.

 

Hey Jackal, good clarification. Having a 6200 RPM cutoff on the motor doesn't mean you actually have to use it. Just have a good, accurate tach and shift where the power curve makes it desirable. If you have a few hundred RPM available before it would cutoff, that doesn't hurt a thing.

 

for anyone who has a hypertech what is the best setting for changing the shift points?