STIJDM

Hey guys,

done a lot of research on turbos in general and most posts give good information but not quite what I need.

I'm looking to go somewhere around 400HP with my 98 V4 Subaru WRX STI (J-spec). I'm currently at around 320HP after my Race Dynamix remap on the vf24.

My question is.. Should I go for a TD05 or a TD06? 16g 20g? and would I need to get a rotation kit?

Also, what upgrades do I certainly need with this? Will my engine even be able to handle it? I've got my injectors and fuel pump done. Unfortunately I am not 100% sure if internals are forged (had a rebuild 5 years ago). Obviously I'd get another remap afterwards.

Thanks!

Nico

Anko Dragt

A TD06 will take a calender to descride how the spoolup is.

I have a billet TD05 20G with modified turbine and even that is laggy ah on a ej20.

16G wont get you 400hp. it will be stuck on 330hp.

for a 20G you will again need bigger injectors (550cc to 380hp, 400hp needs around 640.
Stock block will not handle 20G.
Also the powerband will be more to the right, so a higher rev limit so its alot better drivable.

Rotated isnt necesary for 400hp.. after 500+ it becomes a different story.

Gearbox would need to be changed too. (6 spd or very strong 5 spd)
Intercooler must be bigger. (fmic or big tmic).

boosted

400hp is a difficult and expensive target, high 300's is far more achiveable and more importantly more drivable and easier to live with.
I have a modified evo3 BIG 16g, which delivers 353bhp, I am expecting more with a change to billet compressor wheel.
big16g and 18g would be a good (similar) choice for mid to high 300's.

Anko Dragt

I go what Boosted said... i wanted twice the original power in my car, (2x211hp), but has been proven ridiculously more expensive than a ''close to 400'' number...

TD05 with 7cm turbine housing and an 18G compressor will spool good on a 2 liter.. at about 3400rpm 1 bar.

STIJDM

Thanks! Great help. @Anko Dragt, I've heard to switch a 6 speed JDM gearbox into mine, I'd need to do the differentials too? Is there no strong 6 speed I can transfer from any car?

Anko Dragt

You would need a matching rear diff. depends on what type box you are going to mount and what type diff is already on the car,

Any 6 speed will be ok for the power.

boosted

I have 1.7 bar by 3400

Anko Dragt

Must be a very healthy engine, with a good tune!

im only getting 1 bar @ 4000rpm with a big 20G.. 8cm housing, but it goes to 1.6 bar@4200 to 8250