Greeno

Hi guy's,

Sorry this prolly has been asked before but i cannot find anything around...

I was just wondering what sort of turbo upgrade options there are for the 93 WRX...

I have been looking at the IHI turbo's, namingly the IHI VF34/35.

Would this just be a bolt on application or will i need other mods done to allow for the larger turbo, i understand i will need a bigger intercooler etc but is there anything major that will need to be replaced/upgarded,

Also does it effect the realiabilty/running of the car at all..

Cheers,

John.

pat

John,

there are lots of options for you to choose from but all of them involve somewhat more thn just swapping the turbo. Your car will have a TD05H turbo which has a right angle entry at the front, all of the after market ones have a straight entry, which means you'de somehow need to get your intake pipe unde your inlet manifold. This would require it to be removed and either modified and refitted with spacers, or replaced with an MY97-98 intake manifold.

With regard to the IHIs, the VF30 and VF35 are sleve bearing turbos, whilst the VF34 is a roller bearing unit. Neither of them is bigger than the turbo you have, indeed even the VF22 is still smaller than the turbo you already have! It's just that the plumbing into and out of your turbo is ordinarily rather restrictive, limiting its potential. Currently, a popular mod for this turbo is a straight entry conversion, which although quite inexpensive, does once again require some mods to the intake pipework to allow it to work.

Whatever you decide to do turbo wise, Mark @ Lateral Performance will be able to supply a unit to suit your requirements

You would not need a bigger intercooler just because you fitted a bigger turbo. To an extent, the bigger turbo will actually reduce the requirement for a big intercooler; because it is more efficient, it doesn't heat the air that much, so it doesn't need to be cooler down that much either Having said that, fitting a bigger intercooler to the early cars is a good idea, because the stock one really isn't up to the job, for anything more than a few spirited applications of the loud pedal on the road... on track it will very quickly heat soak and intake temps will go quite high regardless of what turbo you have.

If the job is done properly, it can even extend the life of the car, one of the biggest problems is thermal stress, so if you are making more power not because you are running more boost, but because you are supplying a cooler, denser charge, then it will only be putting slightly higher loads on the bearings during the power stroke, but this will be more than offset by the reduced thermal stress

The next limitation you will encounter is the stock injectors, which are only 380cc units. They will get you the best part of 300 BHP, but beyond that you really should change them, but obviously that will confuse the hell out of the ECU. Fortunately the nice guys over at www.scoobyecu.co.uk should be able to sort you out with a "chip" that will work with the bigger injectors

Hope this helps,

Pat.

Greeno

Thanks for the info Pat, very helpful,

I know it's a difficult question to answer but what sort of Bhp reading do you think would be possiable with the uprated turbo.

I have an aftermarket filter and Exhaust and will be purchasing a uppipe and downpipe soon as well, i will also be ordering a scoobyecu at the end of the month if money allows...

Has anyone else done this conversion on here and had good results...

Cheers,

John.

David_Wallis

nooo.. We dont do custom maps... If you need a board with a map for different turbos injectors then speak to pat.. Ill supply him with boards You supply him with lots of food or money

David

motomc1

hi all what turbo dose a uk 98 come with????? thanks matt

john banks

TD04.

motomc1

THANKS JOHN is there a roller bearing unit that will go staight on spin up faster but not nead a map .as im now and then running the 04 at 1.2 bar IS THIS OK ???????

john banks

Any turbo change is ideally mapped around. If you go for a bigger turbo and use it properly you tend to need to retard the ignition timing, especially at the top end.

The Subaru maps try to drop the boost to 10 PSI at the top, on a good turbo you may be running double this, clearly that needs the right timing.

If you fit a bigger turbo and run on the standard ECU then use a form of boost control and monitor at least for detonation.

Ideally also consider:

Fuel pressure
AFR on wideband
Injector duty cycle
EGT
Charge temperature
Turbo compressor map
Exhaust back pressure
Inlet restriction
Octane/water/methanol

Lots of things to consider.

There is no safe simple reliable bolt on solution. If you do it on the cheap you still need to do it thoroughly by addressing the above issues.

1.2 bar on a TD04 is fine generally on a UK car, but worth checking it is not detting and also some notion of the mixtures (cheap lambda gauge would do for an idea).

Do you mean you are looking for a roller bearing that will spool up quicker than a TD04? Unlikely to find anything cheap/bolt on for a Subaru to do this. However, the TD04 spools up incredibly quickly and early if set up right, so that it almost feels like the car doesn't have a turbo compared with a big turbo, blink and you miss the spool up type behaviour.

[Edited by john banks - 2/19/2003 11:24:47 PM]

motomc1

THANKS JOHN GREAT INFO
IM RUNNING 70BHP OF NOS SO ITS ALL A BIT ...HOLD MY BREATH AND SEE WAHT GO'S BANG FIRST ..ALL OK SO FAR ..STILL GOING TO GO DOWN THE REMAP AND TURBO ROUT THANKS MATT

motomc1

Think ill get a knock link and lamda link next then MANY THANKS

5 Type R

I can recommend Owen Developments , if you want a bespoke Turbo as they build the WRC Turbos for the scoobys and for other manufacturers

www.owendevelopments.co.uk

Deep Singh

I might be biting the bullet and going for fmic and bigger turbo.Can someone explain what defines a turbo.ie I hear all these words,roller bearing/sleave/compressor/exhaust housing to define a turbo.Can summarise what they mean and how they affect the performance of a turbo.
Also who is the best person to keep in touch with reharding the 5/6 hybrid that is being developed.

Mr J

TD05/06....I would think it's that mad Scotsman your looking for...hmm Andy F ..or something

[I spell like crap - 2/20/2003 8:47:13 PM]

[Edited by Mr J - 2/20/2003 8:47:59 PM]

RICH WILD

Deep,

OK, VERY VERY basically, here goes.

Your turbo shoves air into your engine, force feeding it. It is basically a big air compressor. It is split into 2 halves, exhaust housing and compressor housing. The compressor housing is that bit that looks like a snail. There is little wheel (looks like a fan) in here that spins very fast, drags air in and shoves it into your engine. This wheel is attached by a shaft to another wheel in the exhaust housing. Your exhaust gases pass through the exhaust housing and drive this wheel round. Because the wheels are connected, the faster you go, the quicker the exhasut gases spin the exhaust wheel and the quicker the compressor wheel spins so more boost.

Fitting different sized housings and wheels alters the chracteristics of the turbo. Basically big = laggy, small = not laggy but runs out of puff quicker!

The bearings are what allow the shaft between the wheels to spin.

Don't know much about the differences in the berings except that sleeve bearings can be repaired if they wear out whereas rollerbearings can't, you just have to bin the turbo (so I believe)

Hope that helped, it's very basic but there's whole books on this subject and I haven't got that long!

Cheers

Rich

Andy.F

Deep

I currently use a TD05/06 hybrid on my car, although it is producing over 430 bhp it is not fully optimised yet.
Within the next week or two I intend to test an updated version on John Bank's UK car. We are targetting 400 bhp at no more than 1.35 bar, with 1 bar available from 3000 rpm.

We will post up the results on here as soon as we have them

cheers

Andy

Deep Singh

Rich,many thanks.Thats exactly what I wanted a basic explanation.
AndyF,have you any idea what one of these will cost once sorted?
Also I take it 400 BHP is at the flywheel? Roughly at what rpm will it come on song? Any reason why it could'nt be fitted to a STi7? ie will it fit?
Sorry,many questions but I could be a potential customer.

Deep Singh

Forgot to ask,since its use on a STi7 would be a little 'experimental' any chance of a discount?

David_Wallis

Deep.. I would email Andy direct

Deep Singh

Thanks Dave.Andy I will mail you with a million questions!!

Andy.F

Hi Deep

As far as I'm aware, if it fits MY00 it will fit STi7 but I'll confirm this shortly.
In its latest spec 1 bar should be available from 3000 rpm.
The turbo is flow rated to a maximum of 470bhp.
Price will be £750 outright.

cheers

Andy

motomc1

can i get a TD04 hybrided ????

Andy.F

You can but you'd probably be better going for a front entry TD05. Similar money, better result

motomc1

just got hold of td04 as a spare 80 pounds ??????

Andy.F

I'm sure Mark Aigin can sort you out with a TD04 hybrid if that's the route you prefer.

Andy

motomc1

ok thanks for the info andy

Nezz10

A Hybrid TD04 from Lateral performance will cost about £500 on an exchange basis and can give up to 300bhp if setup correctly IIRC.

motomc1

ok nez thanks that sounds good