How high has the bar been raised?

FPenvy · 02-07-2014, 04:20 PM

Quote:

Originally Posted by theDreamer

It might be if you can raise it, maintain power, and when you shift to the next gear you end up in a better part of the rev range. Allowing you to maximize power better, but at the risk of revving higher.

shhhh dont give away my secrets lol

Quote:

Originally Posted by TerribleONE

If it is just to give you a little more space between your optimal shift point, and banging off the limiter I guess that somewhat makes sense. However, I dont think taking it above that on a regular basis is a good idea at all, especially when you factor in that your not making any more power.

yea i agree but as i said before i dont run it up that high ever really. i may go above 7700 here and there if i shift late for some reason but never holding it as to cause damage.

megalapagas · 02-07-2014, 04:54 PM

That's a Great point! I hate when it bounces causing my next gear to be on the low rpms -.- ...will take note on that though to mantain power.

Jordo! · 02-07-2014, 05:08 PM

There's an early "soft" rev cut on OEM tune (fuel based, goes overly rich), I believe, to make the hard rev limit (ignition cut) put less strain on the motor.

You'll see little "divots" in the dyno graph as you approach rev limit on a factory tuned motor, just before the OEM ignition cut.

I'm intrigued by where this all goes, but I am guessing either a seriously ported and polished head and/r different IM will be needed to really capitalize on the higher rev limit.

On a related note, will the VVEL maps (if untuned) be able to extrapolate beyond, say, 7800?

Would love to see someone with stiffer valve springs and a massaged head/IM combo (and, I guess a VVEL tune plus different exahaust cam) push it into the 8+ K range. If torque didn't drop off, that would be a seriously powerful, screaming to redline VQHR.

This is all pretty uncharted territory, at least as far as I know, so looking forward to more details as this comes together

FPenvy · 02-07-2014, 08:02 PM

Quote:

Originally Posted by Jordo!

There's an early "soft" rev cut on OEM tune (fuel based, goes overly rich), I believe, to make the hard rev limit (ignition cut) put less strain on the motor.

You'll see little "divots" in the dyno graph as you approach rev limit on a factory tuned motor, just before the OEM ignition cut.

I'm intrigued by where this all goes, but I am guessing either a seriously ported and polished head and/r different IM will be needed to really capitalize on the higher rev limit.

On a related note, will the VVEL maps (if untuned) be able to extrapolate beyond, say, 7800?

Would love to see someone with stiffer valve springs and a massaged head/IM combo (and, I guess a VVEL tune plus different exahaust cam) push it into the 8+ K range. If torque didn't drop off, that would be a seriously powerful, screaming to redline VQHR.

This is all pretty uncharted territory, at least as far as I know, so looking forward to more details as this comes together

The soft cut you mentioned is what I touched on earlier. I didn't like being somewhat close to 7400 and it cutting some power. Once I raised mine when I got tuned I love that there's no interference from the ecu now.

1slow370 · 02-07-2014, 08:51 PM

Let me rephrase this, how high have guys run their motors without running into valve problems? As for making power above 8000rpm I'm looking at something already to fix that that so for the sake of the question how fast have guys spun the vvel heads?

FPenvy · 02-07-2014, 09:20 PM

Quote:

Originally Posted by 1slow370

Let me rephrase this, how high have guys run their motors without running into valve problems? As for making power above 8000rpm I'm looking at something already to fix that that so for the sake of the question how fast have guys spun the vvel heads?

I don't feel there's power to be made that high to be honest.

02-07-2014, 04:54 PM	#17 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 12	That's a Great point! I hate when it bounces causing my next gear to be on the low rpms -.- ...will take note on that though to mantain power. __________________ GTM 34 Row Oil Cooler \| K&N Drop Ins w/ Z1's Post MAF Tubes \| F.I Non-Res'd 2.5" T.P w/ CF CBE \| Axis Wheels \| Piecing together My Own Custom T4 Top Mount Single Turbo Kit Still in the works \|

02-07-2014, 05:08 PM	#18 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	There's an early "soft" rev cut on OEM tune (fuel based, goes overly rich), I believe, to make the hard rev limit (ignition cut) put less strain on the motor. You'll see little "divots" in the dyno graph as you approach rev limit on a factory tuned motor, just before the OEM ignition cut. I'm intrigued by where this all goes, but I am guessing either a seriously ported and polished head and/r different IM will be needed to really capitalize on the higher rev limit. On a related note, will the VVEL maps (if untuned) be able to extrapolate beyond, say, 7800? Would love to see someone with stiffer valve springs and a massaged head/IM combo (and, I guess a VVEL tune plus different exahaust cam) push it into the 8+ K range. If torque didn't drop off, that would be a seriously powerful, screaming to redline VQHR. This is all pretty uncharted territory, at least as far as I know, so looking forward to more details as this comes together __________________ Enjoy it. Destroy it. Last edited by Jordo!; 02-07-2014 at 05:11 PM.

02-07-2014, 08:51 PM	#20 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Let me rephrase this, how high have guys run their motors without running into valve problems? As for making power above 8000rpm I'm looking at something already to fix that that so for the sake of the question how fast have guys spun the vvel heads? __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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