Highest HP numbers out of a stock RB25

[bkos90]

Hello everyone. I was wondering what is the highest HP record for a RB25 as of now. I know there are a few threads about it but they are old and outdated.
Reason why im asking is because i have a built motor ready to go in and wanted to push the stock RB to its limit. Just wanna know where i stand as far as power. my goal is 700whp on 93 pump and meth injection. if i hit 700 then ill take it to the track and see what she runs. i kind of dont want to blow it either because its always nice to have a working spare block, but if it goes oh well.
Right now its making about 470whp and has been doing so for about a year now as a daily driven car.

So do you think i should do it or not?

And dont worry, it wont be a dyno queen. it will run at the track a few times as well, if lasts of course.

Here are some pics of the setup:

[RRRRB]

i dont think anyone has done 700whp on a stock Rb25 ( in the states) im sure it could be done

What kinda boost are you running to make 470whp, post your graph

[bkos90]

Ok cool. ill be trying to break 700 soon hopefully. the motor is in my s13 right now. im also working on a 74 260z that the motor is gonna go in, and when the motor is up and running in the z i will start the adventure. hopefully in a month or two, still gotta paint the car and all that.

the s13 runs about 20-22 psi, dont have the graph because the guy that dynoed it was a dumb a** and his printer wasnt working. When i dyno the car in another shop i will post the chart.
Here is my youtube channel with some track videos: http://www.youtube.com/user/bohdanko90?feature=mhee
it hasnt seen 1/4 mile yet because its far but has ran many times in our local 1/8 mile tracks.
Best time was a 7.4 @93mph

[chad b.]

A buddy of mine has an RB powered s30, and I have seen it make 650 wheel through a TH400. The motor is bone stock from valve covers to oil pan. With a 5-spd, he would be over 700whp. It held that power for years. Power isn't what kills RB25's, it over-revving them. Don't take it past 7,500rpm. If you do at that hp level, the rod bolts will fail.

[bkos90]

What motivated me to do it is everyone saying that the 2jz is the best engine out there and the 1jz is way better than the rb25. In which i dont agree. The reason there are so many 2jz motors making 1000whp on stock internals is because everyone and their grandma has one. The thing with RBs, many people are afraid to push it because of rumors that circle the forums. for example "the only stock RB motor capable of making 600whp is the rb26". I think the Rb25 can do that and the rb26 can do way more than that. maybe 900whp.
When i went to NSCRA i saw a damn R32 skyline with a 2jz. that got me really pissed off. i hate when people do some s*** like that.

This setup will also be in a S30 chassis

[Shocker]

What motivated me to do it is everyone saying that the 2jz is the best engine out there and the 1jz is way better than the rb25. In which i dont agree. The reason there are so many 2jz motors making 1000whp on stock internals is because everyone and their grandma has one. The thing with RBs, many people are afraid to push it because of rumors that circle the forums. for example "the only stock RB motor capable of making 600whp is the rb26". I think the Rb25 can do that and the rb26 can do way more than that. maybe 900whp.
When i went to NSCRA i saw a damn R32 skyline with a 2jz. that got me really pissed off. i hate when people do some s*** like that.

This setup will also be in a S30 chassis

One thing first, wannabe John Force burnouts through the traps and limiter pounding like that? Wtf man really? Just put it in 2nd dump clutch spin for 12 seconds @5.5k and be done.

The reason there is so many people making 1000whp on stock internals is not because EVERYONE has one, its because its known what it takes.. and that's pretty much a good tune. 2js also have forged factory rods and pretty decent pistons. I have compared a 2jz rod to my stock rb30 rod and its about 10% thicker just about everywhere.. NOt that that means a whole whole lot but it is a forged rod vs RB cast.

I do agree that most are a little afraid to really push RB motors but a few people are doing it and making over 700whp with just cams without issues. I'd say go for it, it comes down to the tune and as said before keeping the revs down to ~500 above factory max, revs kill period. I plan to push my 30 a lot more next year on E85 and see how my factory rods/ARP bolts hold together, I feel just fine at 7200rpm redline.

I'd bet a heavily pushed RB25 will crack a piston/top ring land first, just hope hunks of alum don't waste your turbine.

[RRRRB]

your catch can setup looks very restricted, you have 2 vents, why have them looped into 1?

[bkos90]

You think its restricted? i have them looped into 1 because before i had the other fitting on the catch can going to the turbo intake pipe to create vacuum. but that was too much blow by and the turbo and all the IC pipes gor dirty. so i took it off and now its just vented.

How would you have it set up?

[chad b.]

From the videos, I thought you were a pretty good driver myself. You beat the limiter a little on the burn out, but hell, a lot of people do that. As for the catch can, run a can with 2 inlets, so you can run two lines to it. This is how I have mine ran. I actually have 3 inlets. You could buy a catch can close to what you want, then order weld in bungs from Summit to suit your needs. Mine is -8 coming from the valve covers, and a -6 where the PCV valve used to be.

[95_240]

If you need a new catch can look here. Completely customizable. http://www.saikoumichi.com/

[bkos90]

From the videos, I thought you were a pretty good driver myself. You beat the limiter a little on the burn out, but hell, a lot of people do that. As for the catch can, run a can with 2 inlets, so you can run two lines to it. This is how I have mine ran. I actually have 3 inlets. You could buy a catch can close to what you want, then order weld in bungs from Summit to suit your needs. Mine is -8 coming from the valve covers, and a -6 where the PCV valve used to be.

Hey, thanks! and i was actually thinking about it a few days ago why in the hell i take it to the limiter while doing a burnout. i was looking through some old track videos that are not on youtube and one of them i was doing a burnout with out getting to the rev limiter. Believe it or not it actually looked even more effective, more smoke as well. So thanks to everyone for clearing things up with the whole John Force burnout thing. LOL from now on i will take it easy. less stress on the motor as well.

And when i put the motor in the 260z i will change the catch can setup. might even be able to make my own catch can with some left over intercooler pipes.

[bkos90]

Here is the vid. i never uploaded it since i bogged it badly
http://www.youtube.com/watch?v=Y4XoQVXhLO4

[bkos90]

So what power level do you guys think its gonna give up?

[Cjmartz2k]

Your PM's are disabled bkos90.

[bkos90]

Your PM's are disabled bkos90.

Crap, i had no idea. i think i enabled it. try again plz

[J2fast]

So what power level do you guys think its gonna give up?

from my personal experience i had two rb25 both were stock (1) was r33 completely stock long block the other was r34 stock with some ARP head studs and metal HG. and the r33 lasted like 1 year are more at 550whp then i retuned it an made 650 and blew with in 2 weeks(rod bolts backed out r broke) the r34, i dropped it in with everything from the last build and it ran hard on that 650whp for about 6 months until i had electric problems with my fuel pumps an cracked my pistons. basically after looking at both motors the r33 rods and bolts combo are not as strong as r34(doesnt matter what motor from the r34 series) but if you really wanna make sure your stock stuff last thru the power, put arp head studs, arp rod bolts, and HG and the car should last. just my opinion.

[chad b.]

I've heard so many people tell me that I shouldn't tune for over 450whp on a stock block rb25. Well, if all I wanted was 450whp, I wouldn't have spent the time, $$, and headache on doing an RB25 swap in the first place. 450whp is pump gas SR20 numbers. Hell, there's guys on ka-t.org that make those numbers on stock block KA's. I would think that 500-550 would be fine as long as the tune was right. Also if you have GOOD supporting mods (I/M, E/M, T/B, IC, cams, etc.) and an efficient turbo, you won't have to push it so hard to make the same power.

[Cjmartz2k]

Just my opinion from what I've seen, I think 550-600rwhp is a good figure to shoot for with a RB25. Also, I'm all for the ARP head studs, but the HG is not needed IMHO. I think nothing seals like a stock gasket. HG's blow from the studs stretching and the head lifting. If that happens, MLS or not, your gasket is done.

[J2fast]

I've heard so many people tell me that I shouldn't tune for over 450whp on a stock block rb25. Well, if all I wanted was 450whp, I wouldn't have spent the time, $$, and headache on doing an RB25 swap in the first place. 450whp is pump gas SR20 numbers. Hell, there's guys on ka-t.org that make those numbers on stock block KA's. I would think that 500-550 would be fine as long as the tune was right. Also if you have GOOD supporting mods (I/M, E/M, T/B, IC, cams, etc.) and an efficient turbo, you won't have to push it so hard to make the same power.

your goal of 500-550 should be good. just don't push that 600+ mark, the rod bolts are going to be your weakest point of the motor as long as ur tune is good.

[chad b.]

What number are you chasing at the track? 550whp should be more than enough to go 10's.

[Zacho2]

To you guys with higher power 25's, any noticeable blow by at that power level? After a season of hard tracking mine had just started to pool oil in the bottom of my catch can.

[opticnerv]

so if you get arp rod bolts and head studs you could safely push 600 whp ?

[chad b.]

^^ You can't throw ARP rod bolts into stock rods without getting the rods machined to handle them. Just buy a set of Eagle rods. They sell for under $500, and come with ARP fasteners. Plus they can handle twice the power and abuse as stock rods. It's a no brainer.

[Darius]

^^ You can't throw ARP rod bolts into stock rods without getting the rods machined to handle them. Just buy a set of Eagle rods. They sell for under $500, and come with ARP fasteners. Plus they can handle twice the power and abuse as stock rods. It's a no brainer.

What machining are you referring to?

[240z4u]

When they press in the ARP rod bolts it makes the bearing area oblong and it needs to be machined round again if memory serves. I had this done on my L28ET about a decade ago so I am foggy on that.

[bkos90]

Yup. i agree with that too. i had that done on my built rb25 grindle for the ARP main studs. although i dont know if its required on the rods. it has eagle rods aswell so i have no clue if it needs it on the oem rods.

Im also debating whether or not i should try to push the stock one to the limit, since its kind of time consuming and not that many people seem interested of the actual limits, and not the 400whp limit their grandma told them about because her heart might fail.
I cant have it damaging the head or the turbo if it does blow. so im just thinking of putting in the built motor right away, brake it in and make some serious power without any worries about stuff breaking.

[TimTurboZ]

Yes I just had ARP Rod Bolts fitted to my 26rods about 6months ago, they had to machine the surface where it bolts to the rod caps to be perfectly flush. Didn't cost too much and the 600whp or so they can handle is more than enough for me.