Stock Rb25 - How Much Rpm ?

[kubus]

hi there

what is the rev limit on stock rb25det ?? 7500 rpm ?? would it hold it trashed all day long ??

cheers

[The Mafia]

Umm, no.

Do you know how the inside of an engine works?

If you want to trash the limiter all day, the. Buy a v8 super car or Indy car.

[Moodles2]

Better yet, a 250cc motorbike

[kubus]

Umm, no.

Do you know how the inside of an engine works?

If you want to trash the limiter all day, the. Buy a v8 super car or Indy car.

oh gosh....

i know how it all works - simple question misunderstood i guess...

what is the "rpm" limit for stock engine - using it as a drift car - so will be on the limiter most of the time i guess

[blue_vl_t]

more importantly, ensure the engine temp is kept under control and adequate oil pressure all the time.

[KiwiRS4T]

I think the stock limit is 7200 roughly. What they are saying is that if you sit on the limiter a lot you will probably blow up your oil pump and hence your engine. You need to learn some throttle control so you can spin the wheels without sitting on the limiter.

[Room42]

hi there

what is the rev limit on stock rb25det ?? 7500 rpm ?? would it hold it trashed all day long ??

cheers

A stock rb25det. Taking that at face value I would assume that the answer is "whatever rpm the stock ecu limits the engine to". I never tried it on mine.

Would a stocker take it all day? If we take the engine to be all the parts that make it run then I would say "probably no". You might just lose your turbo. A lot of 15 yr old engines wont take a limiter bashing for 24 hours which is technically a 'day'. And a lot will. Its up to the ecu really and how it deals with a hot engine. Also the engine would have to be in reasonable repair to rev like that for extended periods.

[AngryRB]

bit off topic, but what about for short bursts.. eg drags i see some people do 7400rpm for example, is that only if you have cams and aftermarkets springs or a special rebuild combo??

just interested what the limits are if you had a big turbo with the legs to keep going.. i wouldnt want to rev past 6500 very often myself though.

this isnt relative but an old guy i know says the LS1's can rev alot higher than there rev limits , so the the factory rev limits might be quite conservative..

[Room42]

I rev mine to 7600 every day. It's not stock though. The inside of the motor is but the rest isn't. It revs to 7600 like it doesn't want to stop. You don't even see it coming at wot.

The op did say stock.

Ask SimonR32 what he thinks about rev limits on stock internal rb25det's. I'm about to try his philosophy soon.

Rev limits are for warranties. (and pussies) jks

Edited October 22, 2011 by Room42

[zebra]

I'm sure the earths gravity field throws out the tacho needles out over west lol

[Room42]

I'm sure the earths gravity field throws out the tacho needles out over west lol

You are right you know. My tacho reads 9k rpm all the time. Even at idle...

[AngryRB]

hmm who should one listen too? the pommy guy whos being rude with his two fingers or the aussie guy talking crazy revs with gravity aiding him... hmmmm tutututu

[SargeRX8]

Mine has red line set to 7400. I can hit 7400 before I get the usual WAAPAH PAH PAH sound but I did not raise my RPM red line to hit a higher limit, moreso create a safe barrier from the harsh cut the ECU gives(PFC).

That Simon chap is doing what, close to 8krpm on his stock internal motor and stock box lol. At that rpm the harmonics are out, shit is worn, shit might be lacking tight tollernaces or something and then bam.

Think of it like this, as the theory goes, what ever can go wrong will go wrong.

You want to rev high and drift, buy a rotor. Stock rotors can hold red line for a very long time...

[Room42]

hmm who should one listen too? the pommy guy whos being rude with his two fingers or the aussie guy talking crazy revs with gravity aiding him... hmmmm tutututu

To start with 6500rpm is nothing. A 304 holden v8 will do that.

In all seriousness when a capacitor shits itself in your tacho circuit it actually does read 9k or more all the time. Sometimes it works but mostly it is rooted. Hence the aftermarket tacho/shiftlight on my dash. I'll be sure to post some redline footage tomorrow...

But really the op is asking an arbitrary question if he/she actually means "how much could the stock internal rb25det take all day".

I think some people get scared by rpm. Sometimes the car will take it and sometimes it will shit itself.

You need several things to make an engine last at high rpm. Good oil and oil pressure and a good cooling system is just a couple.

But really who cares? Drive it how you like and be happy. If it blows up then rebuild it or get another used engine. Sure it cost money but money is there to be spent.

Like I said mine see's 7600 every day of the week...on the way to and from work...If it dies then I'll have a pissed off wife and a new motor...

[AngryRB]

cheers for the input.. that power fc sure is rough with the rev limit, i tried setting it for 3000rpm cause i was leaving the car in for wheel alignment and i just about got jerked out of my seat lol.. and the raapah pah pah sounds niceon 7000rpm

Edited October 22, 2011 by SliverS2

[boostn0199]

Its fine if its for a drift car and every now and then you might hit the limiter but your better off shifting up a gear and taking the corner one youll get better smoke and a better drift and two the car will be no where near limiter, I know there are some turns where your stuck and you cant go up gear and the lower gear is to high but yeah just gota concentrate on shifting up as soon as you reach the point where youve maxed it out. When I started drifting I was to riding the limiter all day and thinking its the way to go but yeah once you learn more you see its really not ideal and its better off being in the high gear.

[89CAL]

Set rev limiter just above peak power/torque. with stock engine + turbo + power FC this was below 7000rpm for me. no point reving the engine to 9000rpm if it stops making power at 6000rpm

[The Mafia]

89cal is right on the money.

Bashing a limiter all day shows how poorly experienced you are at driving, and will empty your wallet quickly.

[Don Dada]

Set it to 8000rpm, learn some throttle control and try to keep it around 7000 max.....Try very hard not to hit the limiter as there is a chance of blowing it up everytime you do

[Rolls]

hmm who should one listen too? the pommy guy whos being rude with his two fingers or the aussie guy talking crazy revs with gravity aiding him... hmmmm tutututu

Simon runs his to 8500rpm with >300kw and it has lasted a long time, longer than anyone has expected it to.

Personally I wouldn't run it past 7200 unless you have a big turbo that continues making torque, then maybe 7500rpm. The issue is more sitting on the limiter breaks stuff than the revs itself, unless of course you are revving it to 8k, then you start slowly stretching parts and eventually they let go.