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View Full Version : Proper turbo size for m20b25...


The Twin
08-19-2011, 11:55 AM
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.

thoughts?

NOTORIOUS VR
08-19-2011, 01:47 PM
should be fine for that power level...

e30_kid89
08-19-2011, 04:58 PM
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:

http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech101.html

NOTORIOUS VR
08-19-2011, 05:06 PM
^^ good call

The Twin
08-19-2011, 05:09 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, 05:31 PM
M60 + boost ;)