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Gtr2530kai?

nsta

By nsta,
in Engines & Forced Induction

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nsta Mentor

nsta

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so the kai is for the gtr's?? i want the most responsive turbo i can get for my rb25 for street, that will run me in the mid 12's, ive heard something as small as a gt2535 could fit the bill?, but would the gt-rs be a better option?

is this a good turbo?

http://www.trademe.co.nz/Trade-Me-Motors/C...n-128263102.htm

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EVL-R33 Proficient

EVL-R33

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so the kai is for the gtr's?? i want the most responsive turbo i can get for my rb25 for street, that will run me in the mid 12's, ive heard something as small as a gt2535 could fit the bill?, but would the gt-rs be a better option?

is this a good turbo?

http://www.trademe.co.nz/Trade-Me-Motors/C...n-128263102.htm

No, the 2530 KAI is not just for the GTRs, i got one on my RB25DET and im making 230rwkw @ 20psi with it.. Now im thinking of purchasing a GT-RS for more power..

With the 2530kai you will get great mid range power and they are very responsive..

Edited by EVL-R33
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discopotato03 Grand Master

discopotato03

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From what I've seen all the "KAI" bit means is that a 2530KAI has housings to suit an RB series six cylinder .

By far most GT25/28 series BB turbos use a GT28 turbine housing (meaning a T28 flanged one) . The HKS is the wild card being a T3 flanged GT28 turbine housing intended specifically for RB20's and 25's .

The reason I know the guts are the same is that the cartridge numbers are all the same - 446179-21 or -5021 .

The turbo assembly part numbers I have are 472560-4 and 472560-11 . There are only three variations I'm aware of being SR/CA type , RB20/25 type , RB26 type . Their housings are unique to the intended engines layout .

If you look at HKS's (Garretts actually) GT-RS all they are is a Garrett cartridge with HKS's model specific housings bolted on .

If you buy a GT-RS specifically for an RB20/25 you'll get a port shrouded compressor housing on it , HKS obviously found out that using a compressor of that size with a reasonably small A/R turbine housing would drive its compressor into surge on an RB20/25 .

If you buy a GT2871R 52T from Garrett (same cartridge/wheels) you'll get a T28 flanged turbine housing and a non port shrouded compressor housing because its intended for an SR20 . So basically the RB version is in effect a "KAI" .

Mount flange aside you may so what ? Well the difference is that an SR20 has ~ 500cc pots and its cylinders are phased 180 deg apart . An RB six has either 330cc pots (RB20) or 410 cc pots (RB25) and their cylinders are phased 120 deg apart . Basically a 2-2.5L six is more likely to drive a GT28 based turbo into surge with a bigish compressor . Unlike Garrett HKS only do one turbine housing A/R size - 0.64 , Garrett do 0.64 and 0.86 A/R ratios but only in T28 flange .

Cheers A .

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limpus Mentor

limpus

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This turbo or a gt-rs would be my turbo of choice for a streetable rb25...have seen one on a rb25 make 238rwkw at just under 17psi...with a very fat curve...and it wasn't a happy dyno too...the 2530kai was as responsive as the stockie and its not even boosted high enough yet in my opinion...i'd run these things up to 20-22psi if it were up to me...

Edited by limpus
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