gorganl2000

been trying to find out which turbo would spool faster on wrx

at roughly what rpm would these turbos start to spool and at what rpm would they hit 1 bar

all help appreciated

shogo10

iTrader: (1)

I would imagine the ihi vf35 turbo would spool quicker as it is a roller bearing turbo.

New_scooby_04

iTrader: (4)

The VF34 is the roller bearing turbo mate, the 35 is sleeve bearing, but IIRC the reason for its excellent spooling characteristics is that it has a very small exhaust housing (p15).

Next to the TD04, the VF35 is the next best thing in terms of boost threshold and response

Tidgy

yep, 34/35 spool is about the same, 34 peaks higher but tends to cost more to buy

shogo10

iTrader: (1)

MY mistake i thought all vf turbos were roller bearing?

Tidgy

nope, only some

gorganl2000

jus wondering....as i've seen both the vf35 and td05h
the tdo5h has a slightly smaller turbine wheel than the vf35 from the looks of it....however they have a different number of fins

based on internet sites....seems the vf35 has a 0.51 a/r and the td05h has a 0.49 a/r

but i guess maybe design differences may play a part