ScoobyLee2000

Hi All,

Is it possible to change a standard STI newage Turbo to a Twin Scroll Turbo?

Would you say it is worth it? Would it be as good as having PPP fitted?

Cheers


ScoobyLee

T5NYW

iTrader: (4)

Lee,
IIRC should be able to The down pipe is different though not certain about the up pipe
Absolutely

If you not worried by no warrenty the Turbo and a remap it would be awesome

IMHO

Tony

turboDean

iTrader: (4)

U need to change the Downpipe, Up-pipe, Headers and i'm pretty sure you need to change the sump or something for the headers to fit.

ScoobyLee2000

Cheers

How much would the Turbo cost and where would you get one from??

ScoobyLee2000

So its not just a case of changing the turbo then?? Pipes and all??

Terminator X

iTrader: (7)

Life, women & Scoobs are never that simple

TX.

scoobytyson

Ive done it the other way round, went from twin scroll to single scroll, i needed a downpipe and a single to twinscroll up-pipe

ScoobyLee2000

But does a twin scroll turbo give you less lag and more responsive in the lower revs???

scoobytyson

Yes it had less lag with the twin scroll on but i like to rev the car to the redline.

pippyrips

correct

Terminator X

iTrader: (7)

^^ So I'd be gone before your turbo wakes up ST

TX.

dunx

iTrader: (3)

Halfway mod is a VF34 roller bearing turbo, spools up quicker, but doesn't need all the expensive replacement plumbing. But will only get you towards 360 bhp. But at a reasonable price, just missed one at £400 on here

Dunx

gussy

iTrader: (2)

Or dunx you could go for the garrettt hybrid twinscroll you get the best of both worlds.

scoobytyson

It spools up at around 3.5k revs now but has loads more top end than the twin scroll, I prefer this turbo myself but depends what you like and how you drive

ScoobyLee2000

So its not a simple swap? And expensive! When me warranty has run out I may get it done.

How much would the complete upgrade cost, and how much extra hp.. I could start saving now!!

ScoobyLee2000

What about changing the Standard Turbo to a better one not Twin...? Is this a better option??

stevebt

iTrader: (8)

Why would you want to ???? people go on about the twin scroll as the best ?? I pulled my Hybrid twin scroll turbo off in favour of a single scroll and I haven't looked back

scoobytyson

Your turbo what is on the car is capable of around 350bhp which is about the same as a vf36/37 twin scroll. I would just go for a bigger single scroll like a md321h or similar

Terminator X

iTrader: (7)

^^ Time you stopped drinking that cider Steve

TX.

stevebt

iTrader: (8)

Not tonight I drove my car on 3 cylinders by mistake with my current turbo and it was quicker than my hybrid twin scroll at 1.8bar I only found out I was running on 3 cylinders when I called into AS performance and they resolved the problem When it was on 4 cylinders

Terminator X

iTrader: (7)

Yours is running pretty major bhp isn't it?

TX.

stevebt

iTrader: (8)

I think its a hybrid TD04 from andyf

Luminous

iTrader: (3)

Ok, I have to ask, but what is the twin scroll part of a twin scroll turbo?

Are there two impellers on the exhaust side, with one on the inlet? What is the big deal about the plumbing to get all this to work? I don't get how this works to actually give an advantage to response. Anyone have something simple I could read up on?

Merv

iTrader: (12)

This is from APS site,but gives the basics of how a twin scroll works.

APS TSR Ball Bearing Turbocharger System

stevebt

iTrader: (8)

That is one of the worst turbo's to brag about twin scroll!! I considered that turbo for my car but was steered well clear of it and I'm well happy

Floyd

iTrader: (9)

I have done this converstion from VF35 to VF37. The VF34 is a good single scroll but not that common second hand. The VF37 has the top end of the VF34 and the spool of the VF35 so unless you have a built engine like Steve then stick to a sub 400bhp turbo

You will need a 2.5 sump, oil pick up, dipstick, equal length headers (which are the best OE that you can get), up pipe and down pipe to match.

All is detailed on my project thread in projects!
https://www.scoobynet.com/projects-4...ge-iii-13.html

F

dunx

iTrader: (3)

To keep it real "Gussy" we don't all have unlimited budgets, "we" need a budget solution.... Yes my credit card does have a £10k limit, do I want to fill it ? NO !
VF 34 + Headers + re-map could give 360 bhp and better spool-up for a sensible amount of money.

Dunx

P.S. Wouldn't mind an AET GT30R plus all the bits to get 450 bhp tho'

cster

What's wrong with it?
It looks the nuts in the advert (strangely enough).

ex-webby

Twin scrolls have there place and at the power level <400bhp a twin scroll is better than a single scroll on a 2ltr imo.

I have been down the modification route for twin scroll stuff (heavily documented here https://www.scoobynet.com/scoobynet-...roduction.html

Admittedly I have now gone down the single scroll route, but then my engine has been totally changed (as well as most of the anxcilliaries), so not really like for like.

As a road car up to 400bhp (with everything else matched to the twin scroll) they are extremely quick. That configuration (at 370bhp in a NEWAGE) won last years handling at ScoobyLive, posted 12.5s 1/4's and came forth in class in the 2006 Tuner GP. Oh.... and never missed a single beat all season.

Dunx,
Why bother with a GT30R for 450bhp????

I have an AET standard position "drop in" GT30 (no need to change anything for a car that already has the single scroll up and downpipe). It gives me over 500+ of each at a peak boost of 1.7bar.... on pump fuel! Not many doing that on drop in turbo's, pump fuel and conservative boost (albeit on a fully built 2.5L engine).

Regards,
Shaun.

gussy

iTrader: (2)

Dunx I dont have an unlimited budget (I wish I had) On my last impreza it just became a money pit adding extra's all the time(chasing figures) then taking them off and changing them,this way round it was a one off with a proven conversion which suited me I dont need to change it now.