xsnrgsr

If I strengthened up the valvetrain and rods on my GSR, and got it up to a 9K redline, how would a JRSC react? I know it would spin faster, but would that mean more psi? Would I need to get the Type-R JRSC for the higher redline? Anybody ever heard of doing this?

xsnrgsr

anybody?

oh, and I know that the type-r probably wont bolt to a gsr head.

chri5

The TypeR kit uses the exact same blower(m62) as the GSR kit. So there would be no point in that. The JRSC reaches max boost well before redline, so there would be no more boost to be gained by upping the redline. Most JRSC'd cars power curves are beginning to fall off by redline, so there wouldnt be mch power to gain either.
I think the money it would cost you to redline at 9000 with a JRSc car would be better spent on IHE or, if you already have that, upping the boost.

dustin

Or on a turbo.

leechungsr

You may be pleasantly surprised...

Trust GSR (he doesn't post much) had a high revving GSR setup that ran 12s on the 1/4mile...with the 6psi pully!!!! No joke!!

chri5

Here is a somewhat typical JRSC dyno. Notice where the torque and HP curves begins to slope downwards. There would be no point in extending the redline on this car.

This is at 6 psi. Bump it up to 8 psi and you would gain about 20 hp up top and power throughout. Spend the same money to rev to 9000 and you dont gain ****.

lundgren

Unless you can shorten the gears, longer RPM bands don't make the car any faster really. It might be faster, but it won't feel any faster at all.

austrian type-R

Rboosted717 has raised his redline and gaind about 10whp with the 5.5psi pulley! (It is on a ITR)

superR303

the HP graph on my sc'ed ITR looked like a giant ramp, peaking right at rev limit. it was clear that if the rev limit were higher, it would make more power. I peaked at 219.6hp and 154.4ft lbs. with the 8psi kit, I/H/E. A higher rev limit may not have as much of an effect on the GSR motor though.

zip

Strng1dah: When you see the power trail off at 6000+ rpm on a JRSC plot it's not caused by the SC at high rpms but by the Honda ECU fuel dump. Leaning out the fuel mixture at 6000+rpm has positive gains in the top end. I'm willing to bet that dyno you posted has an AF ratio well below the 12.0:1 ratio at 6000+ rpms.

chri5

I have no clue, it's just one I found. But you still help to prove my point. There are better things to spend your money on than raising the redline. Fuel and timing control, etc. I coudl personally only imagine raising the redline when all else had been done. I would work on other things first, but that's just me.

schwett

sheesh guys! that's my dyno. it's from a completely stock prelude - stock plugs, stock air box, freshly installed jrsc with NO tuning whatsoever.

strng1dah is absolutely right that it was running extremely rich. not only that, but the btc was set very very conservatively. to add insult to injury, the belt was slipping at high rpm (this dyno was with about 2 miles on the kit, and the belt was still stretching i presume.)

on a better tuned car, the torque curve will still start to fall off proportionally to the engine speed about 6000 or so, which means that power will stay constant up until redline. very little point in extending the redline, unless you've got odd gearing.

Hondata

We raised the rev limit 500 RPM on JR's shop car (97 Civic EX) about 2 years ago and gained 11hp. And yes, you should make sure everything else is working well (like air/fuel) before raising the rev limit.

On a SC type R we saw power peaking at 9000 RPM.

Doug

Liltrix

Would U say that a turbocharged Honda will benefit more from the Hondata than a SCd car or the gains will be the same?