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What Size Turbo Housing Should I Go With A Gt2860rs On Rb20?

robots

By robots,
in Engines & Forced Induction

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robots Experienced

robots

Posted
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Getting a gt2860rs for my rb20. Pls help me choose the right exhaust housing.

I lean towards the .63, to help with the spool up. I think dispopotato3 said, that garrett engineers made the real gt2860rs with a larger exhaust and comp housing on purpose. So u could run more ignition advance in the low revs. And to free up exhaust flow at the high revs.

Need your input!

Thanks!

robots Experienced

robots

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Hmmm. I've been looking into nissansilvia forums. And most of the guys run .86 turbo housing. And they get full boost at around 4000rpm. Confused again. Final: .63 or .82 ? Which one will yeld better results ? Still want it to be drivable, but don't want to loose the rb20 hi revs also.

BHDave Grand Master

BHDave

Posted
Posted

Full boost at 4k for the .86 sounds about right, though to put it perspective a GTRS will make 1.4bar at about 4100 on an SR and make another 20rwkw over a disco as well.

I just got deja vu. I'm sure i've written a near identical response somewhere else....

You're better off with the smaller one. Note that HKS only make the 2530 in a .64 as well. It's virtually the same turbo as a disco except for a very slight trim difference on the compressor.

How much power are you after? How much bottom end are you willing to give up? what are the intended uses of the car?

limpus Mentor

limpus

Posted
Posted

Normally i'd say go for the smaller housing but as of late i'm more inclined to say since its going to be gutless down low you might as well make sure it screams up high...but as mentioned it boils down to what you want from the car...

discopotato03 Grand Master

discopotato03

Posted
Posted

The only purpose designed T3 flanged GT28 turbine housing for that NS111 turbine is the HKS one found on 2530's/2535's 2540's and GT-RS's intended for RB20 and 25 . The A/R ratio is 0.64 , Garretts 0.86 A/R turbine housing was only ever made with the smaller T2/25/28 flange .

If you can find a GT2530 kit from an RB20/25 it would be easiest .

A .

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