any rb20 owners with rb25 turbo installed?? feedback wanted.

[blues14]

Just wondering if anybody who has done this swap regrets it or is very happy with it. my car s14 rb20det 3'' dpipe, I/E , auto ecu, walbro 255 fuel pump, oe z32 fuel filter.everything else is stock.

what kind of hp is this turbo SAFELY capable of supporting without the whole 'ceramic blade shatter' we all hear about?

[RB20DETodd]

WASTE OF TIME, i felt no power gains, and that "ball bearing" (rb25) turbo **** is gay my rb20 spooled just as fast, save your self the bloody nuckles.

Just wondering if anybody who has done this swap regrets it or is very happy with it. my car s14 rb20det 3'' dpipe, I/E , auto ecu, walbro 255 fuel pump, oe z32 fuel filter.everything else is stock.

what kind of hp is this turbo SAFELY capable of supporting without the whole 'ceramic blade shatter' we all hear about?

[blues14]

i got a link on SDU that said this turbo is capable of 300 hp on an rb20. I have the turbo in hand , but dont wanna waste time and effort. I am only looking for around 250whp,,,,,nothing crazy.

[RB20DETodd]

i got a link on SDU that said this turbo is capable of 300 hp on an rb20. I have the turbo in hand , but dont wanna waste time and effort. I am only looking for around 250whp,,,,,nothing crazy.

oh if you have it on hand throw it on, you wont loose anything, compressor exit and compressor elbow are a little biger so go for it.

[blues14]

i wouldnt be using the rb25 elbow....i have a 3'' dpipe that comes straight off the turbo.

[SeVa-S13]

I say sell it and put that money towards a .48a/r Super 60 or something, if you want that kind of powerband...reliably.

[armysweitzer]

I love mine, i needed new plugs, had to regap a bit. I have stock pump which is probably stupid but i think theres more then enough fuel there. Most people with simple mods like exhaust, fmic etc say its around 240whp. Id jump on it if the turbo is in good shape for no more then 200. Other then that put the money into a better one, altough I wanted a drop in replacement without spending money on bigger injectors, fmu etc.

PS i think it spools just as good with as my rb20, running 12psi fyi. I kept the rb20 wastegate.

overall verdict, do it.

[blues14]

i am a firm beleiver that NO rb20det with just I/E and a fmic will put down 240whp. sorry.....its just not happening. it might correct for drivetrain loss and have you around 200-210 atw but thats about it. do people realize that 240whp is around 270-280 at the crank? I dont know about you guys....but i am pretty sure my s14 isnt gonna hang with a EVO / STI with just a couple bolt ons.

anyways...your running 12psi on that rb25 turbo? Isn't that coming close to the whole ceramic wheel shattering thing? if it wasnt for the ceramic wheel....i would just bolt it on. but man.....wouldnt it be great having a turbo where that isnt even a problem?

[RB20DETodd]

i am a firm beleiver that NO rb20det with just I/E and a fmic will put down 240whp. sorry.....its just not happening. it might correct for drivetrain loss and have you around 200-210 atw but thats about it. do people realize that 240whp is around 270-280 at the crank? I dont know about you guys....but i am pretty sure my s14 isnt gonna hang with a EVO / STI with just a couple bolt ons.

anyways...your running 12psi on that rb25 turbo? Isn't that coming close to the whole ceramic wheel shattering thing? if it wasnt for the ceramic wheel....i would just bolt it on. but man.....wouldnt it be great having a turbo where that isnt even a problem?

I agree a rb20 is putting out like 190 to the wheels, and the ceramic wheel thing seems to be a hit and miss, ive ran 14 for months straight and recently i hit 20 psi on it for about 5 seconds cause my piece of **** manual boost controler is a piece of ****. my wheel remains

[rb20detsilvia]

can you replace those whels with steel wheels

[RB20DETodd]

can you replace those whels with steel wheels

good question, but the compressor craps out around 15psi so it seems pointless.

[Bluefire]

Well if you use a vg turbo then it would have a steel wheel.

-Bluefire

[lucky7]

so what is the concensis? what does everyone feel is the most boost you can run SAFELY with a 25 turbo? from what i have read, most people wouldnt push past 12psi. any opinions?

[rb20detsilvia]

well looks like there is no point to that if its only good to 15 psi i just dont wanna spend 2000 on a turbo seems like alot to get rid of that stupid ceramic wheel and acually be able to put some psi to the motor

[RB20DETodd]

well looks like there is no point to that if its only good to 15 psi i just dont wanna spend 2000 on a turbo seems like alot to get rid of that stupid ceramic wheel and acually be able to put some psi to the motor

They make cheaper turbo's haha, and i think the rb25 turbine could handle 13-14 cause ive done is for a long time now, and the aussi guys say even 15 safely, but can your fuel system handle it?

[Yellow4g63]

i am a firm beleiver that NO rb20det with just I/E and a fmic will put down 240whp. sorry.....its just not happening. it might correct for drivetrain loss and have you around 200-210 atw but thats about it. do people realize that 240whp is around 270-280 at the crank? I dont know about you guys....but i am pretty sure my s14 isnt gonna hang with a EVO / STI with just a couple bolt ons.

anyways...your running 12psi on that rb25 turbo? Isn't that coming close to the whole ceramic wheel shattering thing? if it wasnt for the ceramic wheel....i would just bolt it on. but man.....wouldnt it be great having a turbo where that isnt even a problem?

Dose this count? Stock turbo at 14psi, had a intakemanifold on it but I don't think it helped that much. And I kinda bent regulator so the car ran a little lean in the hot dyno room. Ohh untuned PFC

[Yellow4g63]

btw at 14psi I'm sure the injectors were close to maxing out sine they reall are just 270cc.

[blues14]

that is impressive..........but how long will your turbo last at 14psi? is your fuel pump upgraded or running a FPR? that can make your injectors 'act' like they are a little bigger. impressive dyno for a basically stock rb20....... but i must say not a common occurance.

[Yellow4g63]

that is impressive..........but how long will your turbo last at 14psi? is your fuel pump upgraded or running a FPR? that can make your injectors 'act' like they are a little bigger. impressive dyno for a basically stock rb20....... but i must say not a common occurance.

I drove it at 14psi for a few months before I took the motor out of the S13 I had. I had the walbro aka wallmart 255lph pump on stock regulator. The bent fuel dampner kinda made it lean out vs running at 10.2 lol.

[Kansei240sx]

Hahaha, owned by 4G63 by 1 hp short.

The VG turbo... if you're speaking of the VG30ET turbo, which on the 86's was the biggest TURBINE that nissan released on any car, yet had a small compressor and was only good to an efficiency of 15 psi too.

[Yellow4g63]

Hahaha, owned by 4G63 by 1 hp short.

The VG turbo... if you're speaking of the VG30ET turbo, which on the 86's was the biggest TURBINE that nissan released on any car, yet had a small compressor and was only good to an efficiency of 15 psi too.

hey I call it 240 lol I round up .

[DriftingisLame]

I think your intake manifold was a considerable gain. Look at it this way, we have a similar setup, and you dyno'd almost exactly 20 whp more than I did... Think of how much power it would add when we're both equal but around the 300+ hp range... or 400+

The power is proportional obviously, but 20hp on a stock setup is impressive to me... Good numbers.

[blues14]

hey 4g63, is that a 3rd gear pull on that dyno sheet? do you remember what timing you were running?

anyways....I may just go ahead and bolt up the rb25 turbo....I should be able to pull 240whp out of that dam thing.....thats really all i am looking for right now. I did notice the turbo has about 1mm of shaft play....is that alright?

[armysweitzer]

i am a firm beleiver that NO rb20det with just I/E and a fmic will put down 240whp. sorry.....its just not happening. it might correct for drivetrain loss and have you around 200-210 atw but thats about it. do people realize that 240whp is around 270-280 at the crank? I dont know about you guys....but i am pretty sure my s14 isnt gonna hang with a EVO / STI with just a couple bolt ons.

anyways...your running 12psi on that rb25 turbo? Isn't that coming close to the whole ceramic wheel shattering thing? if it wasnt for the ceramic wheel....i would just bolt it on. but man.....wouldnt it be great having a turbo where that isnt even a problem?

lol maybe my motor is built internally that i dont know about but yeah sti/evo/350z/g35 all bite the dust from 50 up. I dont know about you but i was about dead even with a chipped 00 s4. Ive run 12psi for the last 2 years so maybe i just have good luck all around.

as far as your comments about 240whp there was a thread not to long ago with a nicely maintained RB20 with bolts on hitting 240 whp.

[Yellow4g63]

hey 4g63, is that a 3rd gear pull on that dyno sheet? do you remember what timing you were running?

anyways....I may just go ahead and bolt up the rb25 turbo....I should be able to pull 240whp out of that dam thing.....thats really all i am looking for right now. I did notice the turbo has about 1mm of shaft play....is that alright?

Yup 3rd gear pull, the timming was at 20deg since I had a auto ecu. Not sure if that affected the PFC tho since I never did tune it. I just pluged it in and ran it the way it came from japan.

[blues14]

i am running the auto ecu too. the car runs like hell at 15, 20 it runs perfect. does your car feel like its 'missing' above 5k rpm when you run at around 15? mine does.

[Yellow4g63]

i am running the auto ecu too. the car runs like hell at 15, 20 it runs perfect. does your car feel like its 'missing' above 5k rpm when you run at around 15? mine does.

Nope ran fine, had a little hesitation when it was cold but that was 3k for a second.

[blues14]

my rb20 was originally installed as an auto.....but converted about a year ago....maybe that has something to do with it..... i have a 5spd ecu as well, and the car runs well at low rpm with it , but runs like S$^& when you get on it. so i stick with the auto ecu. is it true that the auto ecu has more aggressive fuel mapping? I have always heard that, but never saw it in a factual document.

[spivic99]

I just swap the rb25 turbo on mine it pulls much harder at redline. The stock rb20 is just to small the spool time was not even 100rpm diff. As far as a stock rb20 cant make more then 240whp stock i put down 248 bone stock with just a standalone. Injectors were at a 100% duty cycle but af stayed bellow11.5.

[armysweitzer]

yeah!!! take that 20 haters!!!!