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The Twin 08-19-2011 10:55 AM

Proper turbo size for m20b25...
my goal is 275-300hp.
ideally I'd like to start spooling at roughly 3K.

I have the opportunity to pick up a brand new turbo (which would save alot of the cost of buildup.)

here are the specs;

Garrett t3/t4 turbo
t04B housing .60 .63 exhaust, stage 1.5 wheel, got the smaller gt30 5 bolt for better fitment

I understand there many other factors to be considered her (mani-fab) etc.

i'm still not completely onboard with knowing how to match turbo sizes to engine sizes.

I have a healthy m20b25.


NOTORIOUS VR 08-19-2011 12:47 PM

should be fine for that power level...

e30_kid89 08-19-2011 03:58 PM


Originally Posted by NOTORIOUS VR (Post 1518869)
should be fine for that power level...

x2, but that that being said you should take the time learn about sizing (compressor wheel, turbine wheels, housing a/r's, trim etc) and all that so you know what exactly the turbo is going to do for you on your specific engine.

id start here:

NOTORIOUS VR 08-19-2011 04:06 PM

^^ good call

The Twin 08-19-2011 04:09 PM

thanks fellas.

still on the fence regarding m60 vs boosting.

I've always been a NA guy, the power to cost ratio is much easier boosting however...

NOTORIOUS VR 08-19-2011 04:31 PM

M60 + boost ;)

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