External links now open in a new browser tab - turn this off in your UCP - Read more here.

t3/t4 question

Discussion pertaining to positive pressure E28s.
Post Reply
Jaameson
Posts: 4
Joined: May 29, 2025 11:16 AM
Location: Italy

t3/t4 question

Post by Jaameson »

I may be asking dump question for person knowledgeable in FI, but what is the difference between t3 and t4 turbo. Which one is better or if there is one? Thank you
turbodan
Posts: 9366
Joined: Jan 09, 2007 10:19 PM

Re: t3/t4 question

Post by turbodan »

The T4 uses a larger flange and is generally capable of higher flow. 

The T3 turbine inlet is suitable for pretty high power levels. The Garrett GT series doesn't require the T4 flange until youre looking at the GTX4294R, which is more turbo than an M20 or M30 is ever going to need.

A T3 flanged GTX35R, for example, is more than enough.
Post Reply