High revving RB20s?

[StraightSix]

Hi,

What's the highest rev limit you've heard of on an RB20DET - and what parts were used to get there?

Cheers

J

[red17]

Im not sure a high rev limit is of most concern to people anyway. Most RB's (and engines in general) make peak power before redline anyway.

Why the interest in increasing the redline?

Red17

[GTS-t VSPEC]

Shit, you could have a redline of 10,000rpm if you wanted too but most engines will be producing peak power way before this, and it would require racing forged parts.

What are you really interested in, make shitloads of power, cause a high rev limit is not the best way to go.

See'ya:burnout:

[SLY33]

It is when you own a rotary

[Roy]

The Gibson Motorsport R31 ran stock crank and rods (albeit balanced, linished etc) and the old RB20 use to pull 9000rpm with 1.3bar from its T3/4. Up to 480hp but reliably 420hp.

Well at least thats what a Zoom article stated.

[Clint32]

mine pulls hard to 8000rpm, with the big t04 turbo there is no boost drop and still going hard. The rev limiter was set somewhere above this but it has been chipped.

8000rpm is fine for a stock engine.

[R31 POWER]

So 8000rpm is ok now and agian.

[Clint32]

mine seems good for many 8000rpm pulls in the last few weeks.

PS. Just because mine can dosent mean yours wount go Bang, but i know of a few that go that hard.

[slip]

someones built a 10,400 rpm RB30DET in a VL.

If you built the car to go to 10,000rpm and develop peak power around there, it could be done. wouldnt be worth it though.

[MegaGTS4]

I have an auto GTS-4 (vitually standard with a few minor mods) and when I drive at around 55-60kph then I floor the accelerator and drop the auto into 1st you get to see the tacho needle go way past the 9000rpm so I checked the Avc-r and Rsm to check the actual peak figures and both display figures around the 11500rpm (wasn't that high to start with was 10500 first and now it say's 11500 so I broke my old record by 1000 rpm)

and there was no engine damage at all!!(dam no matter how hard I try I still can't break the RB20)

I nearly couldn't believe it the first time I saw it!,I was showing a friend the functions of the Avc-r!

You can imagine the look on his face too!! :lol:

MEGA

P.s might post pic of screen with the 11500 on it if you wan't!

[drifto]

My RB20 runs a standard (I think!) ECU with APEXI A/F & I/T units piggybacked. Cutout should be 8400rpm but I've seen over 9 without a hint of hesitation. Everyone else is right about wasting your time up there as power gains are non existant even with a solid huffer upgrade. No matter how well engineered the RB series are, they're still going to eventually deteriorate or destruct sooner if pushed that hard! Where's the love?

Curious though! Does anyoune know what would most likely give up first? Is it valves, rods or something else?

[rev210]

put a brick on the gas pedal in neutral. I'm sure it will see a good 15-17,000rpm before the engine parts start coming out the exhaust.

we did this to a mazda 808 wagon(and a few others) with the 1600cc motor and although we didn't have a tacho readout, we were pretty sure it was singing at 14,000rpm for a good 10min of fireworks display out of the tail pipe, the longest we ever saw, before the engine seized.

[the devil]

Rb20det's are very strong when tuned correctly. The less you need to rev an engine the better. This will mean less stress on pistons/cranks/rods etc...If your planning on building a car to rev out past 7500rpm+ then do it properly first time and upgrade the bottom end.

[Roy]

When looking at RB20 there arent many people making rods for them, maybe because they arent seen in the same class as RB26/Sr20/2JZ etc. But its worth considering that they are pretty bullet proof factory so no one bothers with overkill rods stronger then the engine could ever flow.

Out of interest does anyone know any stats of the old Sammut Bros Drag 300ZX. I know it ran an RB30, but id be curious to know the level of mods considering the number of untubbed 9/10 sec VLs getting around VIC

[Guest nismogtsx]

I dont rev my motor....

Even though its built for 8000+ rpm gear changes, I dont due to boost bleed caused by a faulty ext wastegate i am just driving the car gentlly until the new turbo/wastegate/intercooler package gets delivered.... I have had the car to 9500rpm back in the days when it had its original stock IC but now with the larger FMIC and turbo the car hits peak power at 5700 rpm and any thing after that is a waste of time... Know what i mean....

But im sure that once i get the new larger turbo ill be able to drive the motor to the best part of 10,000rpm, but even then i will never keep hitting it..

My average gear change is at 3,000rpm i really dont drive the turbo... When i get up it im changing at 5000rpm... But when i really get up it ill go to 9000+rpm (not recientlly as explained above.)

[Guest Works Auto]

Mate your on acid hey. :bahaha:

[Roy]

What computers are you all running so that your engines actually hit those revs???

I wouldnt be happy if i got my car back from the tuner and they had increased my redlien past say 8200rpm. Engines stresses increase exponentially as revs rise.

If i understand correctly its safer doubling engine power using boost only whilst maintaining factory redline, then to increase the rev limit from the factory 7400 (on my engine anyway) to say 10,000rpm. Neither are really safe if you dont want to rebuild/replace an engine if (some may say when) she goes bang.

[meggala]

8200 seems to be the the red line most quoted I know of a very strong rb 20 that was pulling hard to 8500 and this motor ran in this state for 2 years making 5-600 hp it was using tomei forged pistons 82 mm so a 2.2 kit with the rb 26 crank install you can look at 9000 rpm. personalyy 8 k seems fine to me although my car has the rev limiter set to 7600 why you ask cause with my current turbo there is no point.

meggala