jasonsmith

I am looking to do a new turbo for the SR but can make up my mind. The three turbos i have been looking at are the

Gt28r - s15 turbo
GT28RS
GT2871r

I do a lot of autocross so i know best spool would be with the disco potato but i came across this turbo the other day. it is a gt2871r with a gt28r compresser housing

Garrett GT2871R with GT28R style Compressor Housing

I want to know how this would affect this turbo..would spool be better?..can i get the 2871 power with the 28r spool?

I haven't been able to find anyone who has used this turbo yet so in theory how would this turbo differ?

BiG MiKE86

There is a GT2871r thread - full of great info - take a read thru there.. u may find some good inf0.

http://zilvia.net/f/tech-talk/124925...ml#post2333871

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jasonsmith

ya but no there is lot of gt2871r stuff there but not to much on a gt2871r with gt28r compressor just want to know how this would affect the turbo characteristics

idahotuner

gt2871r .64 or disco patato

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SoguRacing

It's not a gt2871 with a gt28rs compressor housing. It's the gt2871 with the gt28rs style compressor housing meaning the 2 bolt inlet and the 3 bolt outlet opposed to the silicone elbow that you would have to slide on to the other one.

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jasonsmith

ok thank you

Def

Spool is going to be a within a gnat's ass of a 56 trim GT2871R of the same turbine A/R.

Same with power potential. The turbine will hold it back before the compressor.

If you're buying new, I'd strongly suggest going with a GT2871R. The "Disco Potato" sucks, barely more power than a GT2560R(S14/S15 turbo), and spools worse with the 0.86 A/R housing 99% of them have. The GT2560R is a good turbo if you get it used for a decent price. I really liked mine, but not sure if I'd buy a new one.

The urge to go bigger is always there... so don't sell yourself short the first time around.

If you're buying used, I'd get a T28/GT2560R and call it a day until you want something bigger.

slider2828

Yup I completely agree, I autox a lot as well. I have a 2871R .86 AR. With a bit of tuning the spool response is great. I had stock cams, a stock intake cam with a 256 step 1 cam, and now a 264 step 1 in/ex. So far, I think for autocrossing, I think the stock intake with a 256 step 1 exhaust cam works the best in terms of power delivery and response. Believe it or not 264 in/ex step 1's do well too, but the mid range power band is really strong and kicks hard and a bit much on a very techical short autox. On a SCCA autox course that lacks traction a 264 in/ex is not going to get you the best times.... I currently run a stock exhaust manifold to give it a smoother delivery, so its helping, but holds down top end for sure.

For response I get about 5 psi at 2700RPM and pretty much 12 psi at 3500 and 16 at about 4000. Trust me psi doesn't mean the same power you would get on a gt28rs, I think it has a crap load of torque, but I can't tell until I jump on a dyno, but definitely more kick than my t25 at 12 psi in the same range..... Hope this helps.

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