RPM at which the rev limiter is set at. Doesn't really matter what you call it.

 

Ok, rev limiter... Do aftermarket tuners allow you to adjust the rev limiter and shift points?

 

If anyone has looked at a dyno graph, it is obvious that the torque starts dropping at 6000 rpm and really starts to tail off at 7000 rpm. As for HP, revving beyond about 7300 HP doesn't make any sense either because the HP goes south at the point. So if both HP and torque are dropping by 7300 rpm, why would anyone want to rev to 8200 on an otherwise stock engine?

 

Depends on the situation. If you just need another couple hundred feet to the 1/4 mile it would be stupid to shift out of third into fourth. You may be on the backside of the hp curve but you'll still be putting down more than if you shifted.

Also on a road course alot of times you need that overrev capability because you are between corners and it would waste time to shift to another gear...

 

I wasn't talking about drag racing....but even if you're drag racing, the way these cars are geared, there will be no need to shift at the end of the quarter mile.

BTW, I'm not talking about a couple of hundred RPM....it's more like 1000 RPM. The power will drop off so much during that 1000 RPM that it doesn't make any sense at all not to shift.

 

Yes you can. with a bully dog tuner you can bump it up by a lot. A guy with an HR sedan on g35driver has set his to 8,500rpm. No cams, no internals, stock head. That's way more than I would set it at but that's what he's running at. A lot of people bump it up safely from 7,600 to 7,800rpm.


Anyhow, the reason you'd want to shift at 7,600rpm rather than peak HP (which is around 7,000rpm I think?) is because you'd be at a higher speed going into the next gear which helps the car pick up and rev a bit quicker and stay in the better and higher part of the powerband. If you shift at 7K, the revs will drop too low for the next gear and you will require more time to rev to redline on the next gear. I hope that makes sense.

 

The only way to find out is when the motor blows, then you'll know it was not a good idea

 

When I had my tune done at UpRev, it was set to a little less than 8k, with the upshift lag though I'd see 8k on my tachometer. According to my tuner & with the tune, my G made power all the way to 7600, whereas it used to drop down after 7.2k before the tune

 

Looks like it's still making plenty of power to me. THAT is not a drop off. If the valvetrain will hold together I'd rev it some more.

 

That's not a dyno of a stock engine. If you read his words, you'll see that it used to drop off at 7200 RPM when stock.

 

Because when you factor in gearing, the net torque (or thrust depending on how you calculate) is still greater in the lower gear.



How's that for stock?

 

I was talking to him.

 

Sorry, didn't realize you were having a private conversation.

 

LOL, that dyno graph obviously doesn't go anywhere near 8200 RPM, so it's not relevant to this discussion. Find a dyno graph of an otherwise stock engine with its rev limited raised to 8200 RPM and then we'll talk about how much the power and torque drop off between the stock redline and 8200 RPM.

 

The OP has said that he only has an intake and exhaust.

Something tells me it's just his tach reading high