Rev Limit On Rb25det?

[dan22]

I wuz jus wondering what the actual potential of the stock rb25det engine is, in terms of the rev range??? cuz the stock engine (i think) has a rev limiter at 7000rmp...if i were 2 remove it, i wuz wonderin how much i cud push it??? jus a knowledge question...he he..

[Al]

I think the factory limiter is set to 7400rpm. I have heard of people poping their engines when they pumped up the limiter to 8000rpm.

[paulr33]

wont make jack all power past 6500 i wouldnt imagine anyway

[Kaido_RR]

stock limiter around 7100rpm,

im heard of people pushing it to 7500-7700rpm wit no problem thou like paulr33 said u wont make anymore power unless u got any aftermarket turbo

[Abo Bob]

mines at 13,000 goes good eh.

[AlexCim]

Is the limiter a fuel cut or ignition cut?

my car spits black smoke on the limiter, so i presume its ignition?

Edited October 12, 2005 by AlexCim

[GKTECH]

Mines sitting at around the 8ish mark... Aftermarket turbo and makes power all the way to redline

Greg

[Kaido_RR]

stock limiter is a fuel cut not ignition cut so im told but, when i had aftermarket bov i would bash the limiter hard and my car would pop HUGE flames

[GKTECH]

stock limiter is a fuel cut not ignition cut so im told but, when i had aftermarket bov i would bash the limiter hard and my car would pop HUGE flames

<{POST_SNAPBACK}>

Got to love the flames... My gf wont get in my car because of the flames... lol

I suppose having no cat wouldn't help... lol

Greg

[siksII]

stock rev limit it 7000, dont know where all these guys are getting crazy figures from!

note that high up in the rpm the tacho reads high. i have found generally if the tacho hits 7000 most of the time it has only revved to about 6700-6800. so 7000 real rpm will usually show into the red.

the power dies off with stock turbo and motor after about 6500 so there is no point in revving it, if u shift up you will end up going faster.

[dan22]

i ve noticed myself dat the limit is at 7000rpm....i had a problem when i had a HKS bov on...during switching gears at low revs, the engine stalls...

siksII have any idea wots causin it?

[Kaido_RR]

stock rev limit it 7000, dont know where all these guys are getting crazy figures from!

note that high up in the rpm the tacho reads high. i have found generally if the tacho hits 7000 most of the time it has only revved  to about 6700-6800. so 7000 real rpm will usually show into the red.

the power dies off with stock turbo and motor after about 6500 so there is no point in revving it, if u shift up you will end up going faster.

<{POST_SNAPBACK}>

My r33 s1 rb25det, has a rev limiter of 7100rpm. secondly i dont see how if tacho read 7000/7100 is only reving to 6700-6800

also saying that if u shif up you will end up going faster isnt as ture as it sounds. the fact of the matter if u shift at the limiter would will be futher along in the next gear. i have drag many mid mod r33, (exhuast,fmic,airfilter the normal) and i have a Rb20 turbo on my car making farless as quick as a normal r33 would be with my mods and i can beat, keep up with them due to them shortshifting and me pushing all the way to the limiter (when i say shortshifting i mean they shift around 5500,6000rpm)

just my 2cents

dan22, have u block up the pipe in which the stock bov would plum back into the turbo intake? also try adjusting the screw on the bov; i had a hks bov for along time on my car with no stall problem

[dan22]

yeah blocked da plum back tube....n tried adjustin da bov as well....at 3000 to 4000 rev if i shift from 1st 2 2nd....da rev jus drops below 1000rev and engine cuts of....it seems like fuel is cut out....i wuz wonderin whether its cus da hks bov is exactly where the stock bov used ta be...

[Kaido_RR]

yeah blocked da plum back tube....n tried adjustin da bov as well....at 3000 to 4000 rev if i shift from 1st 2 2nd....da rev jus drops below 1000rev and engine cuts of....it seems like fuel is cut out....i wuz wonderin whether its cus da hks bov is exactly where the stock bov used ta be...

<{POST_SNAPBACK}>

hmm that is very werid the only thing which i can thing of is you may be leaking air from somewhere, as most of the problems relating to bov are due to a pressure drop (leaking of air) and therefore the car just stalls.

I had a similar problem with my apexi bov as it was venting too much air and the car lost to much pressurer (as the bov is suit to higher hp spec turbo and the stock turbo doesnt flow enough air) all i can think of that maybe the bov isnt working right or something isnt connected right :S

[dan22]

makes sense...cuz am runnin everythin except da pod n exhaust system, stock...so it makes sense dat possibly the bov is ventin 2 much induction air n non is goin into to the engine...explains da massive backfiring....

[Kaido_RR]

makes sense...cuz am runnin everythin except da pod n exhaust system, stock...so it makes sense dat possibly the bov is ventin 2 much induction air n non is goin into to the engine...explains da massive backfiring....

<{POST_SNAPBACK}>

sounds like you found your problem *maybe*,as a was also getting alot of backfiring (bigger than normal) with my apexi bov

[dan22]

appreciate da info mate...can try ta figure my way aroun it now i guess...he he..

[Sydneykid]

The default Power FC rev limit for an RB25DET is 7,500 rpm, that's real RPM as measured by the ECU. Not necessarily the RPM displayed on the tacho.

cheers

[r33_racer]

That would sound accurate to me, since mine seems to bounce off around that point. Ive always noticed the difference of about 200-300 rpm from my dash tacho (when its working) and the tacho on my avc-r.

[Mandingo]

You havent lived till youve heard a '25 @ 9000+ RPM