if my 2002 sti was fitted with aftermarket tubular headers and a 3"full decat exhaust system and a front mount intercooler........

would a td05 20g have a quick spool up or would it be laggy as hell? anyone know what rpm it would kick in at?

 

Depends on what 20g, a AF or Harvey turbo should make full power quicker than a run of the mill 20g. Also if you get a harvey uppipe to match that would help spool.

 

I am viewing from a phone so it's hard to see the turbo properly but in the description they say that it is suppose to be a AF hybrid, i personally wont avoid as there is little info and it may be crap. Speak to Harvey as he had a AF 20g that was taken in px for another unit.

 

he aint got a website tho lol so how do you contact him i cant find any details from him?

 

Yes Harvey up-pipe a necesscity.

Yes Harvey does have a website... Harvey Smith something or other.... ?

Also AF Andy Forrest has a website too...

Best turbo would be something with a Garrett BB core for good spool. SC42 would suit nicely.

A

 

yeah but sc42 is like £1500 which is a lot lol

 

I have a 2002 STI with an Andy F 20g and RCM headers, Duncan mapped it on Thursday....His words as we gave it the first pull "That 20g is going to be a bit perky on here"

Ive read quite abit on 20g's about how laggy they are but IMO they are not that bad, i love the way the car drives now, pulls right up to the redline and gets there bloody quick, so much better than the VF35 i removed....Ok, there are far better turbos out there but they cost far better money.

The word lag only applies if your in the wrong gear!

 

I have a TD05 20G and tubular headers and up pipe, full decat ex, makes full boost 1.3 bar at 3250 rpm

 

1.3bar full boost? That's a bit conservative for what you've got. Even so, that's good for those revs. Is it a WRX?

JohnD

 

Yes i think he have WRX


Jura

 

yep wrx, i am in the process of mapping it just now, its quick enough at that though id say.

 

how much boost do you want like!? thought that would be enough for an open deck block and five speed box lol

 

Open deck blocks can take a bit more than 1.3 lol, there not 'that' weak.

 

you cant genralise like that though really as it is all dependant on turbo size, 1.3 on my old td04 is different to 1.3 on my td05 20g- natuarly.
How much power will the box and clutch take though? at 1.3 bar i would expect to see between 330 to 360 bhp as it stands

 

My friend running 400bhp on OE WRX engine few years without the problem,with box and clutch you have lucky draw/guess,if its hold or will broke...

WRX engine will hold without the going forged 400bhp..


Jura

 

WRX engines will be good(ish) to 350, you see them starting to let go at 330, 350bhp is deemed "safe" but you take your chances, 400bhp will see it fail, sooner or later....

Tony

 

Generally agree but it also depends on the age and condition of the engine. If we are talking about a 6 figure mileage engine then suggest lower, if a late blob wrx then they have been seen to take more than average. Have had 411 out of a blob wrx engine before - admittedly it wasnt in the car long though (it didnt fail) as he put in an sti lump.

In the real world a well sorted VF turbo would probably make for a quicker car though than chasing peak power figures.

 

all good and valid points lads, hence why im keeping my boost around 1.3 bar- im happy with that!

 

No, that's fine for a WRX I mistakenly thought it might have been an STi with stronger internals and stronger box.

JohnD