7500 RPM in a VH45?

[elwesso]

Is it safe? Is it worthwhile, or is 7300 enough that comes with JWT...

[AZhitman]

Not much power being made there, so no real reason to go there.

[PoorManQ45]

Agree with greg. Power is already falling off near redline to begin with. So now real reason to bump it higher.

Wait, maybe if you were going with a centrifugal blower there'd be a reason

[JimmyMethod]

Well, maybe if you had some crazy extreme cams, and a bit of boost... It'd be hard...maybe destroke it too?

[Jeff Williams]

I agree, the power is dropping off at that RPM. It would just be for bragging rights.

Dyno Results

[PoorManQ45]

WEll, you could do it, but it'd requiring changing the intake and the cams

[mtcookson]

You have to also look at the shift points as well. If, when it shifts, you're more in the power band a higher redline may help out.

Take the VG30E in the 89-94 Nissan Maxima for instance. Stock redline is 6,000 rpm. JWT bumps it to 7,000 rpm. Being a SOHC the engine doesn't make much top end power, especially when normally aspirated however... a couple guys raced each other both with nearly equal mods except for one with the 7,000 rpm redline and the other with the 6,000.

The guy with the higher redline always pulled ahead. They said they also raced each other both running up to 6,000 rpm to compare and were nearly equal.

So... basically what I'm trying to say is even though power may be falling off at the higher rpm the rpm you're at after the shift could make a lot of difference.

[PoorManQ45]

Of course it makes a difference in that way. The later you shift the longer you have power pushing you forward.

I think that's the problem one of the Q45 guys had with his 1/4 mile times. He kept having to shift at like 95mph out of second. He ended with a trap speed at like 99.5 or something like that. 500 rpms more would have got him there

[David Steele]

Theres more left in the VH45 above its redline dont let a factory ecu tune fool you.

[Rex]

PQM - I believe mtcookson's point was where the motor is in the RPM range/power band after the shift.

[mtcookson]

PQM - I believe mtcookson's point was where the motor is in the RPM range/power band after the shift.

Yup, that would be correct.