I am considering a turbo upgrade on my 2002 STI. The block is stock and has OEM forged internals, not aftermarket. So, in a perfect world i.e. no knocking, high oil temps etc....

what's the max recommended boost before reliablilty goes out the window?

I vaguely remember 1,6Bar being the limit on OEM internals??

 

Around 1.6 1.7 bar would be the safe limit on standard internals.

 

Excellent, thank you

 

on what turbo?

1.6bar on a vf34 is very different to 1.6bar on a gt35r

 

This assmumes the OP is not going to run a GT35R but somthing more realistic.

 

lol

turbo in use would help

 

Deadbolt TD05H-18G

 

It's a GT4088R.
No seriously, I am just kidding

I am considering the ST420.
I have read that it's happy with a little more boost than say 1.4 bar, hence the question. Just looking for a solid 400bhp or thereabouts

 

Nope, it's is nowhere near capable of what I want. I had one for over a year and IMO it's was not an upgrade for my STI (VF30). I made 290BHP on Rototest (@hubs) and the main issue is that it flatlines at 5500rpm. Some 18G are great I've heard, others are not so great. I made a mistake back then, and I don't want to make another.

 

Ok but that was the turbo on your profile hence at just how good they seem at not producing great figures.

A decent 18G will see up to 380bhp on a well set up car and be faster spooling with your VVT heads at a comfortable 1.6 bar

 

I see
I had forgotten all about that.

Thanks for all replies

 

Have been running a few at 1.7 bar midrange on 450hp capable bolt on turbos for a couple of years now.

 

agree upto 1.7bar

 

Not 2 bar then ?



dunx

 

I am considering buying a newage sti in the summer.. it will get tested to destruction.. will let you know

Simon

 

Did someone mention 1.7 bar

 

lol, it may take you some time Simon, I have seen one whilst road testing to check for a faulty boost solenoid hit 2.3 bar and it didn't bat an eyelid.
It felt quite punchy .

 

they are superb..

650cc injectors and a 450+ turbo, decat and lots of fun..

Simon

 

Erm.....

Should I mention that the JGM hasn't mapped it yet....

I hope he can sort it once the clutch goes in on Monday !



dunx

P.S. Will try and join Photo-KFC-bucket with some pics

 

2bar...

 

WALLOP !

 

Salmacis, did you watch that recent season of prog rock... er, progs, on BBC FOUR recently? Did you cop the feature-length Genesis doco?

Apologies, I've gone off on one.

 

Hi mate,

No, I missed it
But it'll show up on youtube or some other site I guess, and I hope to be able to download the progs

 

You'd dig it the most

 

for the tuners out there is a FPR needed on an 02 sti jdm and also a avcr, and what are the benifits and drawbacks if any turbo is 18g with other bits ike exhaust and induction, sprks etc
thanks

 

no need for fPr with 18g.. the 550cc standard injectors and standard fuel pressure reg will be fine.

boost controller a niceaty but not a must

 

thanks