Are there any other turbos that bolt straight on to the Q4?
wrinx
Are there any other turbos that bolt straight on to the Q4?
wrinx
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
Yes there is!
The exhaust manifold on the Q4, comes stock with a T3 flange.
You can take the stock turbu which is a Garret T3 and converted it to a hybrid, where you use the turbine side of the Garret T4.
Or you can simply change it to the Garret T4 turbo. But then you will get more lag.
My suggestion is the hybrid. Its good for approx 420 Bhp.
Another alternative, is too change the exhaustmanifold to a custom build ala the one from Supersprint, but with a T25 flange.
Then you have all the opportunities in the world with all Garrets ball bearings turbos.
Regards...
RMB-Racing
Ronnie Bonde
Denmark
Anything with a T3 flange will, although some may need oil feed and exhaust pipe mods.
The T3 from an integrale 16v/Evo 1 will be a totally direct swap.
It all depends on how much power/driveability you want........
Has anyone fitted a GT28 series to a Q4? A lot of Coupe owners do this but some mods are required.
1993 Alfa Romeo 155 Q4 , 2.0 Turbo
When I needed a new turbo, I went for the T3/T4 hybrid with a new Supersprint manifold. Completely changed the turbo response.
1994 Alfa Romeo 155 Q4: Dozeing in the garage.
2009 Audi A4 tdi: Everyday drive.1994 Alfa Romeo 155 , 1995cc Std Standard Black
It's a T3/4 I'm thinking of, the GT28 looks like a really expensive conversion from what I've read.
wrinx
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
dont forget to price in a re-map to get the best out of it
a drive no longer full of alfa`s !!
Q4
Sud
Uno T
Delta hf T
Good point, I hadn't thought of that
wrinx
My Q4 in the Garage
www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk
lol
i only know cos i spent a few hundreds on a hybrid for one of my uno T`s a long time ago and found it had made no difference at all !!
but taking it back to the garage which chipped it on std turbo soon sorted it.
I guess that it would still count for a q4 tho it has a far more sophisticated fueling system, as you will be making more compressed inlet air but not adding any more fuel to burn with it.
a drive no longer full of alfa`s !!
Q4
Sud
Uno T
Delta hf T
you would, since the map sensor will tell the engine it's boosting more...
No more expensive with a T3/4 - if you are changing the exhaust manifold as well.
The flange on the manifold has to be a T25 flange though.
Such manifolds can be bought on this site: www.ar-racingshop.de/index.php
Its in german - sorry!
If you can find anything, i?ll can get the prober links.
But my choice will be the T3/4, with another exhaust manifold.
Regards...
RMB-Racing
Ronnie Bonde
Denmark
Your right - it can be very confusion - and my knowledge of turbos is growing too every day!
When we are talking Garret Turbochargers, there are two flanges we are interested in.
(There are several more - but of no important for us)
The T3 flange and the T25 flange.
The T3 is for the Garret T3, T4 and of course the various hybrids we can make of these versions.
The T25 flange is for all the Garret ball bearings turbos (except the GT40), which opens a bigger world, regarding lots of horsepowers.
The T25 flange is also used on the TB28, which is the original turbo on the Fiat Coupe 20VT.
But our problem is, that our stock exhaust manifolds is whit a T3 flange, and therefore is our options limited too the T3 and T4 turbos.
But www.ar-racingshp.de are selling exhaust manifolds whit T25 flange.
But bare in mind - bigger turbo - bigger lag!
The hole idea, is too have a small turbine side of the turbo as possible, and a big compression side of the turbo as possible.
Last edited by RMB-Racing; 28-12-07 at 16:54.
Regards...
RMB-Racing
Ronnie Bonde
Denmark
Exactly!
And that is the setup I?m personally is going for.
And then a custom exhaust manifold with a T3 flange.
My target is about the 400 bhp.
I could also use a custom exhaust manifold whit a T25 flange, and the fit it with fx. a GT2871RS (Which I have on my 260 bhp Passat).
But i think the T3/4 Hybrid is almost perfect for our cars. All the connections fits like standard. It doesn't on the ball bearings turbos.
Regards...
RMB-Racing
Ronnie Bonde
Denmark
1994 Alfa Romeo 155 Q4: Dozeing in the garage.
2009 Audi A4 tdi: Everyday drive.1994 Alfa Romeo 155 , 1995cc Std Standard Black
Steve, did the car require any remapping to go with the t3/t4. Did you notice immediate performance improvements?
JimN~
Can't really say how much of a difference the change to a T3/4 hybrid made as the turbo it replaced was on its last legs. Also at the same time I had a new exhaust and supersprint exhaust manifold. So it wasn't really a turbo swap, more of a complete exhaust system upgrade.
What I can say with all these changes is that the boost comes in much earlier and smoother now, and doesn't fall off until much higher up the rev range.
The car was remapped, it was already running an Evocars chip (Integrale/Q4 hybrid) but was set up on a rolling road to make sure everything was as it should be.
1994 Alfa Romeo 155 Q4: Dozeing in the garage.
2009 Audi A4 tdi: Everyday drive.1994 Alfa Romeo 155 , 1995cc Std Standard Black
I was about to ask Steve the same question. Why am I so curious?
Because I have one for my Q4...but the reconstruction comes first. I wonder what's expecting me...aiaiaiiiiii
Alfa Romeo 155 Q4 WB '95
Alfa Romeo per sempre !
I'm thinking to a custom made one or even a Supersprint...
At the moment I'm prepairing for the rebuilding of my Q4 (if it's the right word) because I've bought it in a not very good condition. I'm sure I will spent a lot of money and time with the project but... "Il cuore ha sempre raggione".
Cheers,
Chris
Alfa Romeo 155 Q4 WB '95
Alfa Romeo per sempre !
if you change to the t3/t4 hybrid, what about stronger bolts and compression, will all this be ok?
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