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Originally Posted by nick_d_240sx
I can't say with any certainty because I've only ran the stock turbo and the 2863. Just 'feels' a little like it falls off at the top, 6250rpm and up, could be tune, could be stock cams/IM/Airflow, could be hotside AR, or a combination. It's definitely a punchy little turbo and I'd love to throw some cams at it and see what it does, probably wake it up a bit more.
A GTX2867 with some cams would rip, but I'm not sure a stock SR20 on pump fuel would like it though..
Maybe someone else can chime in about .64 vs .86 A/R.
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I dunno if this applies, but I have ran both GT2871R 64 and 86 trim. There actually is a big difference, but both dynos dip at the end. I was running HKS 264 step 1 with stock intake and stock exhaust manifolds.
The 64 spooks and creates good useable torque around 3400 to 3500 RPM. The .86 doesn't do much still 4200 ish.... But then gain horsepower at the top and peak torque at the top for longer. Granted this is a built motor bottom and top. .86 was like 380whp on a dynodynamics which is similar to a low reading mustang dyno.
It just depends how you drive and what you like to do. I don't drive much on the street cause its Cali and cops pull you over for no reason other than an exhaust so yeah..... I stay to the track and ring it to 7500 rpm....
Else I .64 is plenty.