JdcTypeR

iTrader: (19)

Just a quick question, Would standard classic headers be good enough for 400 bhp
Cheers,
James

Shaks-STI

iTrader: (7)

Yes, pm Harvey on here he can supply you with ported headers and purpose up pipe all heat wrapped good for 400bhp

JdcTypeR

iTrader: (19)

Thanks for the reply but would non ported headers be up to it?

alcazar

iTrader: (2)

I'd say not, but as above: send PM to harvey. If he doesn't know, no-one will.

I have to say that when my classic went to 400, he advised tubualr headers, but a lot depends on the turbo/up-pipe in use

JdcTypeR

iTrader: (19)

Cheers, Change of subject are you running a 20g on your 2.5? if so whats it like ?

Shaks-STI

iTrader: (7)

I will be running a proper TD05 20G from Harvey or AF, it will be mental (as per few SN memeber who have done this) but you will need a 6 speed greabox because the 20g will destroy your 5 speed and have you forged your 2.5?

JdcTypeR

iTrader: (19)

Yes mate the 2.5 is forged, I'm going to run my 5 speed till it dies and go from there mate.
I'm on the lookout for a turbo at the moment and the TD05 20g seems to be the one at the moment.

Shaks-STI

iTrader: (7)

dont let the gearbox die sell it make some money on it and put it on the 6speed. make sure you get a proper TD05 20g, email Harvey he has this turbos and its not ebay sh*t

JdcTypeR

iTrader: (19)

Cheers mate, i'll look into it

alcazar

iTrader: (2)

HS TD05 20g.........the HS bit is important, it a Harvey Smith modded turbo;(

Coupled with tubular headers and a matched up-pipe, the car is incredibly driveable. Will tootle along in 5th, but has sufficiant torque to go when you want it to, and when the turbo comes in at around 3500, it just boots you in the back

It has a 6-speed and uprated clutch too.

Edited to say: sell the 5-speed, use the money to fund the 6 speed. Makes sesne, it's what I did

harvey

iTrader: (48)

If you have a big enough turbo it is quite possible but it will not be efficient and by addressing headers and uppipe it can be achieved much more easily. Delivery will also be far more enjoyable. There are several cars in the 430-450 bracket on my O/E ported headers.
For best results, particularly on a 2.5, at some point beyond 400 bhp subject to supporting spec and turbo in use, the best option is GT 2 Spec type tubular headers with my trick three bolt uppipe.

A TY752 gearbox will, in time break with the torque from a good 20G. A TY754 is a different proposition and is quite up to the task drien intelligently.

peter zippy reid

iTrader: (25)

I have just bought a td05-18g will your ported headers and uppipe be ok on my 05 sti 2.0 or should i get tubular headers and your upipe harvey cheers

harvey

iTrader: (48)

Hi Peter, the 18G will respond well to ported headers and matched uppipe which are £369 total, the uppipe forming £139 of that. Delivery £12.50 or we fit here in Darlington for a fixed £75.
You are on the border line of where you can consider tubular headers and if you are going to a bigger turbo at a later date, tubular headers may be an attractive proposition but they are expensive. The ported will do a good job.
If you go tubular and you are on the bottom limit of where anybody could go tubular and make it worthwhile the header set is £445. DEI heat wrapping is £105 and my trick uppipe to go with the headers £149. Delivery £12.50 or we fit for a fixed £75. Fitting these tubular headers without my trick uppipe would be a total waste of time.
Please come back with any more questions.

matt-c

iTrader: (5)

Harvey, can you remind me if you have different up pipes, depending on power levels, or there is just one?

M.

Shaks-STI

iTrader: (7)

MATT-C, i think the pipes that Harvey makes depends on what turbo you want to fit and he will make the pipe to work with the turbo, i don't think it varies on what power you want to run but i could be wrong.

harvey

iTrader: (48)

There are six purpose designed uppipes with 2 bolt flanges and I match the uppipe you need to the turbo you have or intend to have. Obviously one uppipe cannot perform well on a TD04 and equally as well on a VF48 or vice versa. Also some people require to retain the uppipe sensor so they need an uppipe with a boss whereas many people and all STis will not use an uppipe sensor.
The logic of not using the uppipe sensor is that if it breaks due to too much heat or long life and natural fatigue then you might have bits of metal going through your turbo and this is not a good thing.
I hope this answers your question.

ianbott

Hi, sorry to hijack your thread but a question for Harvey, is the up pipe O2 sensor on a newage not really needed then? If not what's the purpose and what will happen if I remove it?
Many thanks Ian.

matt-c

iTrader: (5)

Sorry, another hijack.

Would i need to change my uppipe going from one you supplied me for an MD555 to one for an SC46?

harvey

iTrader: (48)

Matt : No the same uppipe for both of these turbos.

Ian You should not run any Subaru without a lambda sensor because without it you will have no closed loop lambda. The lambda sensor is located in the headers in the collector close to the driver's wheel. The sensor in the uppipe is a CAT sensor on the WRX. Once removed if a CEL appears it can be overcome with a small resistor.