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S15 Turbos on RB26/30??

Skyline95

By Skyline95,
in Engines & Forced Induction

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GTR-Ben Proficient

GTR-Ben

Posted
Posted

They are basically T28 Ballbearing turbos, good turbo's for a RB26 or RB30. The problem is if you want to use the stock GTR manifolds they have a T25 flange where the S15 Turbos have a T28 flange so not a direct bolt on.

Probably easier to go single or get a couple of Modded GTR turbos (T28 spec)

discopotato03 Grand Master

discopotato03

Posted
Posted

The cartridges in the S15 GT28BB's would probably work OK but the housings differ from RB26 specific turbos to suit the single SR20 application .

I prefer the larger single for cost and complexity reasons but if I had to use twin GT28's I would use those with the more open bladed turbines . The compressors on those S15 GTBB's are a specific type for the OEM but are available as replacement cartridges .

TTT Grand Master

TTT

Posted
Posted

a few people have used these turbo's as a poor mans version of N1's.

also, I believe that UAS's "boostedZED" uses or used these on his 300zx.

which is a 3L engine and he was producing some decent figures with very little lag.

But since the 300zx uses T25's as standard, the S15 turbo's which are also T2 based turbo's were much easier to adapt then to an RB engine.

One more thing to note..

NOT all S15 turbo's are Ball Bearing.

and no, not all JAP S15's have BB turbo's.

here is how you can tell.

All that matters is the garret number, everything else just confuses matters

466541 = ball bearing

466543 = bush bearing

for the second bit of the number

-001 = S14 turbo (no splitter between wastegate and turbine exit)

-002 = S15 turbo (splitter between wastegate and turbine exit)

These numbers should be stamped on to a little plate which is on the housing between the compressor and exhaust side of the turbo.

Cheers

TTT Grand Master

TTT

Posted
Posted

the flanges on the manifold will need an adapter.

also, I'm not sure if the compressor housing and wastegate sit in the right spot.. you may need to rotate the compressor housing to suit..

I am sure about the manifold adapter but not sure about the second part..

you will have to see someone that has done it or cross that bridge when you get to it.

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