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If you are talking about the Garrett 0.86 A/R GT28 BB turbine housing I think you'll find they are not the same style as RB26 specific GT28BB turbine housings .

Have a close look at RB26 style turbos on the turbobygarrett site , they tell you that the housings on these turbos are the "compact" style and are not intended really for any other app .

From memory the dump pipe flange is different and the housings neck aimed slightly differently from generic GT28 BB housings which are really aimed at SR20/CA18 type single apps .

I have not seen the 0.86 GT28 BB turbine housing machined to suit the turbine in the "-9" or RB26 type GTSS .

They should fit the SR20 type GTSS but that uses a different turbine to the GTR variant .

Cheers A .

.86A/R work very well on an Rb30 with GTRS's

we have seen

600nm & 620hp at 13psi (engine dyno)

They needed new dumps as they have the SR20 flange

Thats what I was looking for.

The 0.86 A/R I was thinking might be the go on the -5's with the RB30 even -9's.

yep, definately worth it. Making the dumps are a pain though.

This setup also used 150mm lengthened inlet runners (rb26) which also helped the torque figure become so square.

You put your foot down and it almost rips the seats from there mounts, lol

yep, definately worth it. Making the dumps are a pain though.

This setup also used 150mm lengthened inlet runners (rb26) which also helped the torque figure become so square.

You put your foot down and it almost rips the seats from there mounts, lol

Making the dumps isn't a big deal in the scheme of things, that sort of power delivery is something else.

Do you have any graph of the engine dyno to hand that you can post?

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