Garage19

I need to find / construct a turbo with a fairly hard to find spec. Not bothered if garrett or IHI etc.

I need a small exhaust housing / turbine wheel either from a 1200-1400cc engine or one of a pair on twice the capacity.

I then need to match this to a compressor wheel/housing that will support 200 bhp.

I was thinking of maybe a T2 from a renault 5GTT with a larger cold side from something else or maybe a Fiat uno IHI unit with something similar.

Any ideas??

Many thanks,

Doug.

EricYellow

Take a T2 turbo from the 5GTT and fit the compressor side of a Peugeot 605, 406, or citroen evasion, XM 2.0 petrol turbo engine.
Goes straight on.
Put them togehter and you've got a turbo that can supply about 220 bhp
Tried it on my Peugeot 106 gti turbo and worked fine.

COMEDY DAN

Garage19

That sounds promising! So the compressor side off a 2ltr turbo petrol engine.

How much bhp does your 106 make? Sounds like a good project! Any probs with the wet liners moving around?

reality

Why do you want to do this? Take a standard erst turbo. The 0.36 exhaust housing is already too small to let you get to 200bhp.. the compressor is about right for 200bhp but the t3 0.36 is just too small.. I mean, you can force it... but then you're seriously compromised

Rick

the 0.36 will do 200hp with ease - in fact it's the front wheel that is more on it's knees...

Garage19

The exhaust housing may be too small for the 1600cc s of an ERST but the engine i want this turbo for is much smaller!

The ERST hot side would be far to large for what i need.

reality

With all due respect Rick, you're completely wrong. Have you measured the back pressure with a 0.36?

Here's the compressor map..

reality

Perhaps just go with a T25 then? The 60 trim (standard nissan 200 turbo) has a pretty tiny exhaust housing (which strangles a 1.8 to 200bhp), so maybe for your application it'd work better..

DaveAVT

We run 0.36 a/rs on the Alpine GTA's with a 50 trim comp wheel and get around 230bhp...


As for the first question, why not just use a straight out of the box Rover 200/800 turbo, T25, 0.49 exhaust housing with the largest off the shelf comp wheel, good for about 220bhp.

On a R5 they make full boost around 3500rpm. The other option is to fit this comp wheel to a standard T2 turbo.

DaveAVT

The a/r is larger than the Rover unit..

DaveAVT

How about a couple of GT2559VNTs? Ive got 5 in stock...

Even if you don't use the full use of the VNT mech, you could fix it to the desired turbine a/r.

T28 compressor wheel, and T25 inlet flange.. Will need external wastegates tho..

EricYellow

It "made" about 210 bhp when I sold it, now some bugger is trying to make it faster...and now I just keep on getting mail about how he has to put it back together.......

No problems what so ever with the liners.
Friend of mine has got the same engine with a T3/T4 on it, has got 290 bhp (on the dyno) and no problems there either.

Garage19

Ok to clarify..... the turbo is for a 1000cc bike engine so thats why i need the tiny turbine wheel/housing!

DaveAVT

Er, you may be surprised...

It may only be 1000cc, but it revs to nearly triple a car engine, so if its too small will heavily restrict it...

Garage19

Thats what i thought years ago but it's actually un-true. The first turbo bike i ever built had a 900 cc engine and reved to 11500rpm so i used a T25 of a nissan thinking that 1800cc at 5750 rpm would be the same. WRONG!

Dyno development for that bike went:

Stock 112 bhp
1800 nissan turbo 130bhp. (it hardly spooled up)
After trying three other turbo combos with progressivly smaller turbine wheels/housings we got 180 bhp @ 10 psi

The smaller engine just doesn't have the energy/flow in the exhaust to spin anything with a big turbine housing up.

DaveAVT

Yes, but the Nissan housing is a large 0.64 housing.

My point is don't go for a tiny (as in T2) housing and wheel..

The Rover unit would be a good happy medium.

Garage19

It was actually of a silvia and was a .48 from memory.

reality

It's certainly not black and white when it comes to picking an exhaust housing.. Most people will just try them all and observe the back pressure until they get the best for their package..

DaveAVT

The turbo on the Silvia is actually a T2, so I don't know what smaller housings you tried, as there isnt anything smaller on the market (or smaller than a 0.49 really)

The VNTS I have would be a good option, at least you can play around with the mech and fix it anywhere between a 0,64a/r and a 0.2 a/r.

Stavros

Err, no.

Good for 250bhp at 16psi on the S13.

And the S14 has a much bigger T28 good for nigh on 300bhp.