I Want To Get More Revs!

[Dush]

  ginger said:

Hey guys,

Looking at making my rb25de rev harder.

What do i need to do???

All help is good

Thanks

BEE*R REV LIMITER FTW!!!

[SKiT_R31]

I've got an RB25DE Mines ECU for sale, that i havnt found the limiter on yet (well past 7500..)

It seems to have slightly leaner mixes and HEAPS more timing (esp down low)

selling because im saving for a pfc

If you want your car to rev, your gonna need the right cams to take you that far, valve springs - meh, i havnt had any problem with mine, you'd more want to worry about the bottom end taking it

[funkymonkey]

  Dush said:

BEE*R REV LIMITER FTW!!!

all that does is hold your revs at a lower level than the factory limiter... granted it keeps the fuel going and cuts the ignition, but all that does is make popping noises, increase exhaust temps, melt cats and in general reduce the life of your engine. oh and it shoots flames. meh.

[scathing]

  GTS4WD said:

Stupid question but what exactly is the correct process of short shfting?.. I heard so many different interpretations of this I need to clear this up..

My context for short shifting is to change gear before you hit the cutout. I think that's the common understanding.

I get the feeling your confusion is over "flat changing", which some people interpret as being clutchless and others consider to be "not lifting off the throttle".

[GTS4WD]

Cheers scathing!

I heard both versions of flat changing.. and I believe the clutch is there for a reason.. use it..

I will occasionally change without lifting off gass, but you need a clutch if you want a gear box.. Unless theres a half mechanically decent way of flat changing without using the clutch. Ideas?

I heard this version of "short shifting" too.. kind of ironic though.. short?.. fuel cut?.. meh..

[SKiT_R31]

Short shifting isn't necessarily shifting before the limiter, but more shifting before the ideal point - for example shifting at 5800rpm when your peak power is at 6000rpm, or even shifting at 6200rpm when your still holding your peak power (because you'll shift into lower power, so your missing out).

The best way to shift perfectly, is you dyno your car, and figure the rpm where the power drops off (after peak power) vs the power your shifting into, for example, my car drops off about 10kw by limiter (currently using standard 25DET ECU) shifting then puts me right back into high revs and about the same power. If i was to shift right on peak power, i would be shifting back say ~ 30kw.

i.e. my old power (havnt dyno'd since yet) power peaked at 6000rpm and dropped to ~ 140 by limiter, at 5000rpm it was also at 140 and peak torque, so revving to limiter and shifting into peak torque is alot better than shifting at peak power back to ~ 4000rpm and building it all up again

That said, if i want to feel the power and have a bit of fun, i shift right on peak power, because all my gain is from 4000-6000, so thats where it rips you back and where all the fun is at.

These days though, keeps making power till limiter, without limiter i couldn't feel any drop off but fear of popping it made my safc dump fuel 7000rpm = flames flames flames and no ignition cut

[GTS4WD]

Cheers SKiT.. Ill try that next time out for a drive..

Sounds like its a good tip to become a better driver..