rb25 turbo on rb20, upgrade?

Discuss the RB20, RB25 and RB26 series engines.
black240jl
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i want to get a turbo that i can run about 14-18psi on without messing up, i heard the rb25 turbo is an upgrade for the rb20, i also hear there not much better, my friend has an rb25 turbo rebuild with a differnt turbine, to make it spool faster and he wants 500 bucks usd, and i was wondering if it was worth it or should i get a t3 garrett or somethnig, let me know thanks alot


apollas
Posts: 153
Joined: Sat Aug 11, 2007 3:24 pm
Car: rb20 type-m

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500 for a rb25 turbo? i think thats alot for just an rb20 upgrade. i think the 25 wont boost that much more than the 20 just that the 25 has better flow than the 20 due to the 20's ceramic wheel. i think thats it for the 25 but i may be wrong though (get a 2nd opinion)

but, imo, with that 500 just save for a bigger turbo

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l0nestar
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Depends on what you want. If you already have a running 20 and want it as a 'drop-in' replacement, it might work.

Or you could spend an extra $100-150 and get a new genuine T3-T04e... But you would have to modify your DP, check your flanges, etc. which increases the price.

The choice is yours.

Yellow4g63
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I'd go with the T3/T4E a little more work for a superior turbo.

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Joe
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apollas wrote:500 for a rb25 turbo? i think thats alot for just an rb20 upgrade. i think the 25 wont boost that much more than the 20 just that the 25 has better flow than the 20 due to the 20's ceramic wheel. i think thats it for the 25 but i may be wrong though (get a 2nd opinion)

but, imo, with that 500 just save for a bigger turbo
the 25 also has a ceramic exhaust wheel and is prone to exploding above 13psi.

you can almost get a brand new turbo for $500. just save and get a decent t3/4.

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StricNyne
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yeah, i would only get the 25 if lets say u needed car up in a bind, or yeour stocker was blown and u had no money, cause 500 is half of the price of a gt28rs which i think will bolt up and is BRAND new and a better turbo

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nizmo zilvia
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You can get RB25 turbos from $225 - $300. For $500 I'll just get a bigger turbo.

apollas
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Car: rb20 type-m

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If you dont want to go through the hassle of modifications get a turbo from HKS, there RB turbos are direct bolt ons

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l0nestar
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black240j wrote:l my friend has an rb25 turbo rebuild with a different turbine, to make it spool faster and he wants 500 bucks usd, and i was wondering if it was worth it or should i get a t3 Garrett or something, let me know thanks alot
Did, whoever rebuilt that turbo, replace the ceramic exhaust wheel with one made from steel?

HKS gear is hella pricey.

black240jl
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he said its steel, and its set up to boost up to 20psi and to make 400 hp?

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Joe
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black240jl wrote:he said its steel, and its set up to boost up to 20psi and to make 400 hp?
unless its a modified rb25 turbo, he is an idiot

black240jl
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it is a modified one, full redone, he has 500 into it and he wants 500 back out.., he has an sr20 and was gonna use it as an upgrade, hes running 14psi on his car now, im thinking about snatching it up, hasnt been used yet still brand new

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Carl H
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a highflowed stock turbo?bleh.i would pass and just get a t3/t4 57 trim for that kind of coin.

black240jl
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i was thiking about getting an aftermarket, but i ca prolly get this for 400 and i only want to make like 300whp or 350, it will bolt right up, and spool quick, i think i might go for it, if.when i do i will keep updated.

apollas
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Car: rb20 type-m

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black240jl wrote:it is a modified one, full redone, he has 500 into it and he wants 500 back out.., he has an sr20 and was gonna use it as an upgrade, hes running 14psi on his car now, im thinking about snatching it up, hasnt been used yet still brand new
he spent 500 on modifying a rb25 turbo? wow..if you think about it he is probably selling it to you and using that 500 you gave him to buya better turbo for himself imo

craz4240
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I have a custom built rb25 turbo,built to gt2871r specs...it was a 700$ upgrade at the time.Myself I am gonna be upgrading and selling this turbo.....it flows great,bolts right up and made a huge differene and has seen 18psi.Running it this summer and will get some numbers up...then on to bigger things.

amiyama
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Ehh... in Thailand we can buy used Rb 25 Turbo (Ball Bearing) about 115 USD. Make sure whether it's white or black turbine ( i heard black is much better)

The most fav. modification combo for RB-20s here is Thailand are;

- Replace to Rb 25 Turbo Ball Bearing (Black turbine)- HKS Super flow air filter - 3" Exhaust pipe- Modified ROM - 4.3 LSD. - Nismo Clutch

All above are hooked up mostly in Cefiro A31

And I heard that it runs mid 13 sec for 1/4 mil.

Some shop here in Thailand can generate 430 hp. for RB-20 and of course, they changed the pistol and everything

If there are any question, we warmly welcome y'all at http://www.cefiro-thailand.com

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metal maverick
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Car: 1991 240sx hatch, rb20det 230 at the wheels (r.i.p.) 1990 240sx hatch, hp to be announced

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this is a link to a forum on skylines downunder the australian skyline page. it has a few dyno sheet results for some rb20s that have the 25 turbo, but careful not all of them are this swap there is a t3/t4 and othersalso got you a kw to hp converter

http://www.skylinesaustralia.c....html

http://www.mr2ownersclub.com/converter.htm

also right here a guy puts down the specs for the 20 and the 25 turbo, and declares around a possible 50hp top end limit gain on the 25 (300hp)compared to the 20 (250 max) of course everybody's engine will respond differently, 2 rb20s with the swap may have very different power gains.

http://www.skylinesdownunder.c...38694

this is most likely what i will be doing next on my rb20i'll let you know in 2-3 months lol

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rbsileighty
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RB25 is a good turbo for response/power on a budget... I'd recommend it as long as you can pick one up for 200 or less. I have a 20 and a 25 at my house and will hopefully dyno both soon... if I can ever finish my renov stuff on my house (only taken me 1.5yrs so far but 2 full bath and 100% new floor is a lot of work) I will get some dyno numbers for both. I'm not running a cat though and I think most of the cars on SA etc are... so keep that in mind.

neonbomb
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If you have a hard copy of the rebuild and dyno graph of it being used, then 500 bucks would be worth it if youre looking for an easy upgrade.

drftup32
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hi.. to start of mate these guys are talking a load of s***, first thing do not buy a t3/t4 they are s***. u would be a hell of alot better using a rb25det turbo but u must buy the correct 1,(45v4)or(45v3) as these are both factory steel internals, 45v2 and any other 1s u will find are ceramic shaft, and therefor these will snap if u ever use a top mount manifold with your turbo as u have to rotate your intake housing.. if to buy a 25det turbo make sure it is 45v4 as i stated before, if u buy a t3/t4 expect to be hiting boost at 4g ... pathetic, on my rb20de+t i have a rb25det turbo and it is crazy it does ezy third gear stand stills and holds drifts amazingly, al i have done is put a rb20det wastgate actuator on the turbo so it runs a nice 10 pound boost, only other modification is a walbro fuel pump, 2 and 3 quarter exhaust and the correct tune for a plus t, and is incredibly reliable, it goes so well the injectors are maxd out and it owes me the minimal dollar, cheers

Yellow4g63
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Scotty712
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Joined: Mon Apr 11, 2016 5:56 am
Car: Rb20 s13 coupe

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drftup32 wrote:hi.. to start of mate these guys are talking a load of s***, first thing do not buy a t3/t4 they are s***. u would be a hell of alot better using a rb25det turbo but u must buy the correct 1,(45v4)or(45v3) as these are both factory steel internals, 45v2 and any other 1s u will find are ceramic shaft, and therefor these will snap if u ever use a top mount manifold with your turbo as u have to rotate your intake housing.. if to buy a 25det turbo make sure it is 45v4 as i stated before, if u buy a t3/t4 expect to be hiting boost at 4g ... pathetic, on my rb20de+t i have a rb25det turbo and it is crazy it does ezy third gear stand stills and holds drifts amazingly, al i have done is put a rb20det wastgate actuator on the turbo so it runs a nice 10 pound boost, only other modification is a walbro fuel pump, 2 and 3 quarter exhaust and the correct tune for a plus t, and is incredibly reliable, it goes so well the injectors are maxd out and it owes me the minimal dollar, cheers
Um no^^^^^ ALL RB 25 turbos have ceramic exhaust wheels man smh, they have different material front compressor wheels. All max of 14 psi. Ball bearing doesn't mean steel wheels lol


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