Stock RB25DET - Max RPM

[Freebaggin]

What is the max safe rev limit a stock RB25DET motor can handle?

[EnricoPalazzo]

Im curious about this aswell. Im thinkin of uppin the rev limiter to 8k

[Sciby]

There's no point in doing so if you're making most of your power before your current redline. You won't make anymore power, you'll just shorten the life of the engine.

[EnricoPalazzo]

Really so on a modified, yer stock turboed car, leaving the redline would be wise...

Thanks

[Sciby]

Well, think about it this way... on a stockish Skyline, power peaks at about 6,000rpm, then starts dropping off... if you increased redline, it's still going to drop in that new area... best thing to do, shortly after you hit peak power, change gears, get back into that meaty power/torque area and pass the guy.

[R32-GTS]

Or if your racing a r32 with a rb20, just turn off and pretend you wern't even racing :shake:

[Sydneykid]

Hi guys, We rev internally standard (but balanced) RB25's to 8,000 rpm all the time. But as has been posted, it's a waste of time if the engine power drops off at 6,000 rpm.

[Raza]

Or if your racing a r32 with a rb20, just turn off and pretend you wern't even racing .......thats if ur the guy in the rb20

[RNS11Z]

I got aftermarket rods in my car and rev to 8k, though its been balanced and it has new bearings and rod bolts.

[4 Doorz]

LMAO.....RNS...you got everything aftermarket, I don't think you car counts here

[MattR]

mine has seen 8120prm on the odd occasion as read on the microtech, not sure how to change it.

[Freebaggin]

Didn't want to get into the argument about why I shouldn't rev to 8000rpm, I just want to know what the motor is capable of both in terms of valve gear and also bottem end of a TOTALLY stock (unbalanced) motor.

Then I can potentially match a turbo to that safe rev range.

[MattR]

as far as I know my bottom end is stock with mild head work. dont know if that helps or not.

[Freebaggin]

MattR, so just mild porting do you reckon or upgrades valve springs/guides etc?

[MattR]

Not sure what was done, 1.2mm hks gasket as well not sure bout valves and whatever??