HX35 ftl.... That IS a big laggy turbo for people on a budget, no offense.
The people saying gt30's are laggy either haven't used them or maybe you say that as an excuse to make you feel better for not being able to afford one.
A gt3071 will spool AT LEAST as fast as a 2871 if not faster. It is the same compressor wheel with a easier breathing exhaust wheel and scroll. Think about it..
I use a Precision billet wheeled 5858 .63a/r which is closer to a gt35 sized wheel and it spools almost identical to the 56trim 2871 .72a/r that I used before. (2 liter sr)
Compressor size is not the only contributing factor. Exhaust scroll size can significantly change a turbo's personality.
With all that being said, if you want to max out around 400whp, go with a gt/gtx28xx.
If you want to go above that (450-500) then you need to be using a 30r framed turbo.
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