H4RDY-P1

iTrader: (46)

Currently running a ihi vf35+fmic making 347bhp,but im gettin really bad surge!!,so im thinkin of swappin the turbo for somethin slightly bigger to overcome this problem and give me a bit more power!!

Pete

How about a TD05 18 or 20g??

H4RDY-P1

iTrader: (46)

Was thinkin about the 20G,but are'nt they a bit laggy and they can make over 400bhp,maybee slightly too big,as i use the car everyday!!,and the 18G may not be capable of 370bhp?,i may be wrong!!

Pete

Yes i think the 20g is a little laggy, you might be suprised with the 18g though.. ok it might not make your 380 but i think 360 MAYBE...and in all fareness you're not going to notice 20bhp...

Granby

iTrader: (5)

Andy Forrest got 378bhp / 365lbft from a TD05-18G on his project wrx

Pete

That's why i said he might be suprised..

scoobytyson

I would go for the 20g as the 18g is not worth having for 20-30bhp over what you have now, or an md321h

Granby

iTrader: (5)

Just read on the Andy Forrest website that he used octane booster when he got them figures so 360/370bhp is probably about right

R4LLY

iTrader: (1)

Pending on your setup the 18G is a "Regular" 370 bhp Turbo, with a few people getting in the 400's. With the right supporting mods and more importantly mapping, the 18G is an excellent turbo for road use.

Although the 20G may have the ability to produce a higher top end BHP figure, the mid range torque in the 18G is superior making a car which is very quick on the road.

The MD321H is a very nice turbo, and will easily achieve 400 bhp on relatively low boost, but the price does reflect the quality.