madey

Best step up from td04 on 05 wrx? Everything else is done decat pump plugs ect. TD05 16g ? I can't find a vf34/35, need the quickest spool up. The 16g would be from Andy Forrest, any advice?

scooby1929

iTrader: (1)

If it was me I would go for the Harvey Smith TD0518g for about 650!! You would need to change your injectors

madey

Concerned about later spool up with the 18g, not looking for more than 330bhp.

Jay m A

iTrader: (2)

You've considered Andy's TD04 Hybrid then? Thought they were good for 320 and better spool than the 16g

madey

Hi, yes, I have considered the td04 hybrid, still a possibility, I would rather have 320 and and good spool than 330 and a later spool up.

Mrchips

iTrader: (7)

I am in the same boat, don't know what to go for, I was going for an 18g, then a 16g and now thinking about the td04 hybrid, for quick spool, and it'll be a bloody quick road car.

I did like the td04 when it came on my car, bought to other turbos and not sure whether I like the kick when turbo comes in.

dynamix

iTrader: (3)

18g isnt laggy.

16G is a great turbo though and would make a great upgrade - will need 550 injectors though - you will be over the top of the std injectors.

scooby1929

iTrader: (1)

I was in a wrx today with a 18g fitted from harvey and was very impressed!! As Dynamix said not laggy at all

joz8968

iTrader: (13)

People forget about the SC range... SC36 sounds perfect for what you want.

Read from the 1st post of page 4:-

https://www.scoobynet.com/trader-ann...-better-4.html

madey

Completely confused now, don't know which one to go for.Both Andy and Harvey do the 18g but with my present TD04 comeing on boost at 25000 I am still concerned about the later spool of the 18g.

madey

Duncan, yes 550's already organized.I think the 16g should get me to 330bhp, do you think?

joz8968

iTrader: (13)

550's won't prevent it from achieving that figure - they're more than adequate (which I'm sure you know ). But there's no guarantee of the 16g making it. That said, it is capable of c.320-350, typically. So you'd be unlucky not to make your 330, or thereabouts.

Don't think the 18g is much later spooling than the 16g - think the exhaust housing/wheels are the same(?). I believe the 18g has slightly bigger comp wheel so can push more air - this is why they usually make anywhere between 350-380. Obviously, with a bigger impeller comes slightly more mass/inertia to the CHRA, so it's prob this that makes it slightly slower spooling than the 16g...

joz8968

iTrader: (13)

madey, if it helps you, I'll be fitting a harvey 18g with 550cc inj too. This decision has been arrived at after detailed talks with none other than the incredibly helpful and knowledagble Subaru guru, API David.

joz8968

iTrader: (13)

Nothing that an extra bit of gear-stirring can't address!

Well worth it for the extra bhp the 18g will make over the 16g, assuming your 05 WRX's IC is able to make/manage that power, which I think it can. (Think it's rated to c.380-400+, so spot on).

dynamix

iTrader: (3)

Joz said it all above lol.

18G + 550's makes a great pairing.

joz8968

iTrader: (13)

I count that as a pukka, professional endorsement! lol

Can't wait to get my mods done now! (rubbing hands vigourously ).

So madey - you should do the same! lol.

madey

Thanks to Duncan and Jos, finally decided it's going to be Harvey's 18g and 550's. Cheers for all the advice, Mick.

joz8968

iTrader: (13)

You know it.