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Max Hp Out Of Standard Rb25

LNEMUP498HP

By LNEMUP498HP,
in Engines & Forced Induction

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benl1981 Grand Master

benl1981

Posted
Posted (edited)
lol

We will have to wait and see

is that a dare is it

anyways if all goes well ill pickup a standard motor in 2 days and

be back there next week

if not

then yeah we will never know and just have to wait for my new motor

And ill post picks of WHY it lost COMP tomorrow

It makes sense to not bother with forged internals etc. Look how he did with a stock motor. For most people you could go a little conservative compared to what he's getting and be happy for many years!! Unless you are after huuuuge no's that aren't street useable. Good luck with the next stocker..

Rb30 block would be nice

Edited by benl1981
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r33_racer
r33_racer

498hp on std rb25...mate that is impressive. Now we just gotta wait for someone to come along and say 'thats a load of the "proverbial"' What sort of knock you getting on your current tune?

2rismo
2rismo

Wastegate creep from hell. And doughboy, you in the 'gong and not visiting me or bringing me apple pie? that's slack! Jason, leave the boost as it is for now and race it - THEN get the wastegate ch

Phantom32
Phantom32

fark me...that took a good 3 hours or so to read. Extremely helpful and useful thred to read tho - it's given me plus many more others the confidence to push out 25's to the 300rkw mark as opposed to

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DoughBoy Veteran

DoughBoy

Posted
Posted

Thread revival from hell!

The pistons are all perfect, they have a bit of carbon build up but not excessive. The ring lands are all perfect, and the crowns show no signs of detonation either.

The reason why it was low on compression...... bend rod!! Hah

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Cjmartz2k Proficient

Cjmartz2k

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I don't know if this is meaningful input to this but I was running 400rwhp from a T04e (.56 trim, .84 a/r P trim) for around 6 months, till I put on this Holset HX35/40. Now I'm running 1.5 bar (22psi) and I haven't dyno'd it yet, but it's at least 70-80hp faster measured with my super accurate butt dyno :laughing-smiley-014: . I've never even had the valve covers off the motor (except to paint them), stock HG, cams, intake manifold, TB, etc. I really think it's all in the tune--and I'm running around 12.1-12.3:1 air fuel with ex temps around 800-850c at the highest.

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2rismo Grand Master

2rismo

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I don't know if this is meaningful input to this but I was running 400rwhp from a T04e (.56 trim, .84 a/r P trim) for around 6 months, till I put on this Holset HX35/40. Now I'm running 1.5 bar (22psi) and I haven't dyno'd it yet, but it's at least 70-80hp faster measured with my super accurate butt dyno :laughing-smiley-014: . I've never even had the valve covers off the motor (except to paint them), stock HG, cams, intake manifold, TB, etc. I really think it's all in the tune--and I'm running around 12.1-12.3:1 air fuel with ex temps around 800-850c at the highest.

Nice going.

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Cjmartz2k Proficient

Cjmartz2k

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Posted (edited)

Mine's still kicking. I'm full HX40 (19cm ex housing) which is a 69lb/min compressor at 1.7 bar, now with 264 cams, 1.2mm HG, RB26 ITB's, and still the same stock bottom end. We still don't have a dyno anymore on island (well, it's still there, but they won't run it--it's a dynojet anyways). I ran out of Z32 MAF a LONG time ago, so we moved it to 100mm piping. I've got 860cc no name injectors that are sitting just over 70% duty cycle with a/f's right around 12:1. You can do the math on that. I run with some of the faster 2wd guys here on the island with built RB26's and smaller T88's (in S13's), but I think they have a pretty rich/retarded tunes judging by the fireballs they shoot and the fact I'm hanging with them.

The guy that owns the shop I hang out at put a Holset HX52 (90lb/min) on his stock bottom end RB25 with a completly built head (solid lifter, tomie everything biggest cams they make for the 25, yada yada) and he stopped turning up the boost at 1.5 bar because he was tickling 95% injector duty cycle on 740's. He also just had his twin plate start slipping on him, so we haven't had a lot of time to play with it yet.

I can't remember if it was this thread or the other where somebody was questioning the hp guesses I was making with my old set up due to my 122mph trap speeds (with full weight--subs, full interior, random crap in the trunk, etc.), so I won't make any here. I'll see if I can get the Gtec from my buddy again and get some new trap speeds, but I spin even in 3rd on 275 nittos, so I think that's skewing my speeds a good bit.

*edit--I do is 4-5 quarter mile'ish runs a week on average with the occasional playing around in the twisties, so I'm not road course racing it all the time like a lot of you guys. That might help longevety.

Edited by Cjmartz2k
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rtune Experienced

rtune

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Posted
The guy that owns the shop I hang out at put a Holset HX52 (90lb/min) on his stock bottom end RB25

"Holset HX50-55

For engines of 10 to 15 litres capacity the Holset HX50 and HX55 are specified on some of the world's premium rated heavy-duty engines at up to 470 bhp. "

funny..

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Cjmartz2k Proficient

Cjmartz2k

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Those displacement and hp figures are on diesel engines spinning to 3k rpm max. A good ballpark firgure for diesel turbo to gasoline application is mulitply by 2 :D

If you have any doubts about holset turbo's on gasoline engines, google "holset DSM" for a wealth of info specifically on guys running them on 4G63's (Evo motors). This thread is about what RB25's will do though, and not holset turbos, so I don't want to sidetrack the thread to much going on about them. PM me or start a new thread if you want to go into them further.

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rtune Experienced

rtune

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Posted
Those displacement and hp figures are on diesel engines spinning to 3k rpm max. A good ballpark firgure for diesel turbo to gasoline application is mulitply by 2 :D

If you have any doubts about holset turbo's on gasoline engines, google "holset DSM" for a wealth of info specifically on guys running them on 4G63's (Evo motors). This thread is about what RB25's will do though, and not holset turbos, so I don't want to sidetrack the thread to much going on about them. PM me or start a new thread if you want to go into them further.

I believe you, I just thought it was a chuckle.

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2rismo Grand Master

2rismo

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Posted
my god LNEMUP has some temper issues. so many ppl giving decent input and saying nice work and all he did was get the shits.

That's not ALL he did. LOL! Don't know how long before we hear from him again. I don't think they have many computers there.

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