Anyone twin turbo'd a RB20 or RB25 before?

Post by **dsrturbo.com** » Wed Mar 25, 2009 1:59 pm

and if so what exhaust housings did you use? Im considering trialing .49 but will be pushing it to flow them from a rb20..

http://www.driftsideracing.com...0DETT

Post by **cachanilla86** » Wed Mar 25, 2009 2:28 pm

We modified the Stock RB26 manifolds to fit the RB20 head:

Post by **bounty212** » Wed Mar 25, 2009 2:53 pm

what are the advantages of this setup on rb25? i can get my hands on an rb26dett setup for free so i might do this? anyone dyno this?

Post by **cachanilla86** » Wed Mar 25, 2009 3:03 pm

We experienced too much lag (along with other problemas) with the Twin Turbo setup on the 20, and the owner chaged his setup for a T3/T4.

The other problem was Overboosting (our error) , at 15 PSI, we heard a boom!...after that, this came out from the 4" exhaust

Those Turbos are fragile and expensive to repair.

Post by **mean240** » Wed Mar 25, 2009 6:52 pm

cachanilla86 wrote:We experienced too much lag (along with other problemas) with the Twin Turbo setup on the 20, and the owner chaged his setup for a T3/T4.

The other problem was Overboosting (our error) , at 15 PSI, we heard a boom!...after that, this came out from the 4" exhaust

Those Turbos are fragile and expensive to repair.

haha the same thing happened to me lol but on my STI. bt mine came out in 1 piece! sucks!

Post by **dsrturbo.com** » Wed Mar 25, 2009 8:57 pm

Hi Cachanilla,

do you know what size exhaust housings are/were on the twin turbos you used? And when full boost came in

Thanks for posting the image,

D

Post by **cachanilla86** » Wed Mar 25, 2009 9:35 pm

I dont remember the size, only thing I remember the turbos came from a R32 RB26. Full boost came at 4000 RPM.

Post by **dsrturbo.com** » Wed Mar 25, 2009 10:12 pm

full boost not to bad considering most CN T3t4s make full boost at 4500-5000+ rpm on rb20

I hope to make this rb20dett thing work

Stage 5 cams, valve springs and cam gears have been added just to try help it spool up alittle. If it works il post it up Thanks C

Post by **dsrturbo.com** » Wed Mar 25, 2009 10:18 pm

I found this:

Nissan/Garrett RB26DETT (T28 style)The Skyline GT-R engine uses a pair of T28 turbochargers to achieve its 206kW claimed output.

Just one of these turbochargers can be employed on engines making about 120kW, so long as the ceramic turbine isn’t pushed beyond its limits. A single R32 GT-R turbo is ideal for, say, a 1.5 litre four cylinder with a few breathing mods.

The GT-R compressor inlet is 53mm diameter but, again, we were unable to measure the discharge nozzle diameter. The compressor is marked with a 0.48 A/R ratio. On the opposite side, the GT-R turbo uses a 38 x 50mm turbine passage and a 63 x 93mm mounting flange. The turbine housing is also marked with a 0.54 A/R. The mounting flange and dump pipe are 4-bolters.

Note that this turbocharger uses the same turbine mounting flange as the S14/S15 200SX, Pulsar GTi-R and various other Nissan turbos. This makes conversions easy.

.54 exhaust for r32 gtr and mine .49 so maybe will work out

Post by **sci2000tech** » Thu Mar 26, 2009 7:31 am

Here's a link to my setup.

zerothread?id=326571

I put that project on hold while I throw a single on my Vert because I really can't afford to go RHD and do all the other modifications to the engine bay that it would take to make this manifold work.

When I called Greddy, they told me my poweband wouldn't be very streetable with such small turbo's and that the motor wouldn't be much good above 6000 rpm.

Post by **Nissan2367** » Thu Mar 26, 2009 9:37 am

sci2000tech wrote:Here's a link to my setup.

zerothread?id=326571

I put that project on hold while I throw a single on my Vert because I really can't afford to go RHD and do all the other modifications to the engine bay that it would take to make this manifold work.

When I called Greddy, they told me my poweband wouldn't be very streetable with such small turbo's and that the motor wouldn't be much good above 6000 rpm.

Why? I mean props for something new but looks like a waste of time for the results...

Post by **Kansei240sx** » Thu Mar 26, 2009 10:09 am

That turbo on the bottom looks like a walnut.

Post by **sci2000tech** » Thu Mar 26, 2009 1:05 pm

Nissan2367 wrote:
Why? I mean props for something new but looks like a waste of time for the results...

Big waste of time/money. I wasn't able to find a way to get twins to yield the powerband I wanted on an RB20. It seems as if you either run small turbo's to reduce lag, and have no top end; or you run 2 larger turbo's(such as stock RB26 turbo's), and don't see spool until far later than I wanted.

This is all info I gathered from reading online/talking to other people, no first hand experience.

I finally came to my senses and am going for a much more streetable setup.

Post by **DrifterProdigy85** » Thu Mar 26, 2009 4:47 pm

I cant remember what magazine i saw it in but a guy did Twin GT30R's on a RB25. From what i remember it said it was laggy but made Alot of power. Personally id just try to go T88 or something instead of F'ing with twin dowpipes and wastegates and intercooler piping.

Post by **BHFR-GTR** » Fri Mar 27, 2009 7:23 am

i have that magizine here somewhere, awsome car he made close to 600 whp on a stock rb25

Post by **scottymizt** » Fri Mar 27, 2009 7:23 am

im planning the same thing, i have the turbos and manifolds i already have them mocked up on the spare head i have. So 14psi is the max boost? or is it lower? I have a t3/t4 turbo but i would rather have the twins on there both are bought and paid for.

Post by **BHFR-GTR** » Fri Mar 27, 2009 7:30 am

someone needs to do a compound setup on a 20 use a t28 at the main feeding into a gt35 or something for spool up and power like diesels 100 psi hahahaha

Post by **legit240sx** » Sun Mar 29, 2009 4:11 am

fuel upgrade is a must if you want to run safely

Post by **Carl H** » Sun Mar 29, 2009 7:55 am

guy was also a complete toolbag and one of the most arrogant bastards i'd ever met.basically told me to my face that my car sucked and onlything to run on it is the aem, needless to say i dont have much respect for him.

BHFR-GTR wrote:i have that magizine here somewhere, awsome car he made close to 600 whp on a stock rb25

Post by **Shocker** » Sun Mar 29, 2009 8:18 am

Carl H wrote:guy was also a complete toolbag and one of the most arrogant bastards i'd ever met.basically told me to my face that my car sucked and onlything to run on it is the aem, needless to say i dont have much respect for him.

Money cant fix arrogance.

Post by **BHFR-GTR** » Sun Mar 29, 2009 4:41 pm

damn sorry to hear that, i hate meeting people that have nice cars and other things that are complete d!ck, what they have makes them no better than anyone else

Post by **bounty212** » Sun Mar 29, 2009 6:14 pm

okkk soo.. should i run the twins on my rb25 (i can get them for free) or my internally gated gt32? i want to make mid 400s in hp is that doable with the twins and some supporting mods like greddy manifold, tubular exhaust manifolds, injectors?

Post by **legit240sx** » Sun Mar 29, 2009 7:07 pm

bounty212, I think its a bit of a head ache and really truly i think there are better options. i wish i thought about it more before i went and bought all my stuff but im just going to trek on and see what sort of results im going to get. def think it over. laggy as crap kinda sounds good to me though...

Carl H,d!ck drivers are pritty fun to play with...but none the less stupid and retarded to think their the "best" and "no one can beat my stock 1 1/2 ton sti monster" haha jk can't talk until i get my whip going

Post by **StricNyne** » Mon Mar 30, 2009 8:49 am

if u wanna waste time and money, go for it.....

here is my nightmare of twin turbo rb25, unless u go with a topmount setup dont waste your time and money, paid liek 300 in an fittings and lines and adapters, for the return setup just for it to be hitting the steering it can be done, just not worth it for stock rb26 twins, not worth it at all actually....

check this out

zer...age=1

Post by **dsrturbo.com** » Tue Mar 31, 2009 2:09 pm

I've added a few pictures to the gallery.. Includn my first attempt at porting

Post by **BHFR-GTR** » Tue Mar 31, 2009 6:10 pm

i am serious about the compound setup on the 20's mount the small turbo on the exhaust mani, run the down pipe into the exhaust side of the larger turbo, and run the smaller turbos compressor outlet into the intake side of the larger turbo then the compressor outlet of the larger one goes to the intercooler, and the downpipe from the large turbo goes out the rear. great spool up, you are using the smaller turbo to spool the large one. and if you had a built motor you can get some insane boost levels. i am thinking about doing this setup on my next build because the second turbo can be mounted anywhere in front of the car and not on the manifold

Post by **dsrturbo.com** » Thu Apr 02, 2009 10:13 pm

pictures updated once again.. Even tho everything lines up and going to lift the runners up on the first manifold and bring the flange out, on a angle for better ease of fitment.

Post by **ST240** » Sun Nov 15, 2009 2:55 pm

Just out of pure curiosity, wouldn't it have been best to run two GT15s or GT20s in a parallel setup?

GT15http://www.turbobygarrett.com/...3.htm

GT20http://www.turbobygarrett.com/...1.htm

Or something like twin small 16gs? Technically you should be able to do it with properly sized parallel twins no?
Modified by ST240 at 6:16 PM 11/15/2009

Post by **spolitte** » Sun Nov 15, 2009 5:24 pm

Has anyone ever done a proper sequential turbo setup on an rb20? With actuators and exhaust gas control valves to direct exhaust flow.

Anyone twin turbo'd a RB20 or RB25 before?

Anyone twin turbo'd a RB20 or RB25 before?

Re: (cachanilla86)

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Re: Anyone twin turbo'd a RB20 or RB25 before? (dsrturbo.com)

Re: Anyone twin turbo'd a RB20 or RB25 before? (dsrturbo.com)

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Re: Anyone twin turbo'd a RB20 or RB25 before? (ST240)

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