Volvo K24 turbo in audi application.

[prj]

the volvo units have (IIRC) the same compressor impeller dimension but a more efficient design than the RS2. The RS2 turbo can do 380 without to heat the air like crazy and it is proven more than once.

No, it's not "proven more than once".
Post some proof, IAT vs RPM vs Boost vs IDC for example.

And you know why? Because I have more than 300 of such graphs of the RS2 turbo.
I know perfectly when it starts heating air like crazy.

The Volvo turbo has a smaller compressor than the RS2, get your facts straight.

[Billman]

the volvo units have (IIRC) the same compressor impeller dimension but a more efficient design than the RS2. The RS2 turbo can do 380 without to heat the air like crazy and it is proven more than once in real life and in paper.

[prj]

Because that compressor won't do more.
And a RS2 compressor will not do 380hp without heating the air like crazy on a stock engine.

[Billman]

the main restriction for more than 380 hp on the rs2 turbo is the turbine. If the porsche item is 1 mm bigger than the RS2 as these measurements show why wouldn't it do more?

[prj]

I believe that if you mate the Porsche hotside (housing-impeller) with the Volvo compressor you will have most probably a 400 hp turbo.

400hp? Forget it...

[s2_wot]

Link to one off a police car in the UK

5324 970 7401 does that fit the bill?

[Billman]

I believe that if you mate the Porsche hotside (housing-impeller) with the Volvo compressor you will have most probably a 400 hp turbo.

[andy10v]

Rebuild kit is about £50, and £50 to balance. (http://www.turborebuild.co.uk/)

RS2 exducer 52mm
hotside housing diameter is 54mm
inducer 46MM

so volvo/ biggerr porsche could give
exducer 54.5
inducer 45.8

Or smaller porsche/old audi (what Ruffiano did) gives
inducer 45.8
exducer 50

So the larger hybrid will spool later than the rs2 unit?

[andy10v]

So what do people think fitting the larger wheel/housing would do? Increase lag? Increase power?

Or just avoid and find the 50mm exd?

[andy10v]

Hmmm

944 has all K26 turbo , later 89' 944 and 944S has bigger hotside housing - aka K26#8.

from

http://www.s2forum.com/forum/showthread.php?t=14172&highlight=k26

and

Hi lini! Which k26 are you using from the 944? 220bhp or 250bhp??? I red somewhere we could use the turbocharger from the 250bhp version for a turbo upgrade on the 2.2t and avoid the 220 cuz it is like going one step back from the k24-7000. I'm afraid all the 924/944 turbos are only oil cooled unfortunately, so the time between oil changes may be reduced. I have this information about the 944 turbocharges used on the engine 951 (2.5 litres 4cyl), which one do you have???

KKK Porsche 944 Turbo 1985- ??
(2.5) 220bhp K26 53269706710 951.123.131.00

KKK Porsche 944 Turbo 1985- ??
(2.5) 220bhp K26 53269706720 951.123.131.02

KKK Porsche 944 Turbo 1989-91
(2.5) 250bhp K26 53269707041 951.123.131.03

KKK Porsche 944 Turbo 1989-91
(2.5) 250bhp K26 53269707042 951.123.131.03

Cheers!!

from

http://www.s2forum.com/forum/showthread.php?t=34129&highlight=53269706710&page=2

[andy10v]

Approximate sizes

Volvo exhaust wheel

Wide bit; 59mm
Narrow bit; 49.5mm

Porsche exhaust wheel

Wide bit 64.5mm
Narrow bit 54.5mm

Both shafts approx 10mm

So does that would appear to make the porsche housing a bit on the large side. Or is that the way it is meant to be?

What would happen if I put the porsche exhaust wheel on the volvo turbo (aside from needing to get it balanced?)

Any input?

[andy10v]

What boost profile have people run on this?

[andy10v]

A bit of collected info from this thread;

I used this info to get the porsche one;

K26#6 50mm can be found in Porsche 944 220hp version. Also some ancient Audi K26 used the 50mm exducer. I guess it's typ43 200 5T.

The usual Audi K26 turbine is 56mm exdu.

And volvo

Ok so the turbo is from a 2002+ Volvo S60 R or S70 R.

5324 970 7400

Volvo Part number:8603298, click on the link below, there are several part numbers for the turbo, i believe the one i listed is for the "later" style with NON-vband outlet on the compressor side, the picture shows part number 30713137 which is also a valid number.

Regarding sizes;

Here is some info about the Compressor wheel and the turbine wheel sizes:

Compressor Wheel:
O.D. – 62mm / inducer – 45.8mm / ETT (Extended Tip Technology)
Turbine Wheel:
O.D. – 59mm / exducer – 50mm / tip – 9mm / 5.4mm stub shaft dia.
TH:
6²cm area / set pressure – 7 bar @ 7mm lift

K24-7400 specs should be:
Compressor - OD 62mm, Inducer 45.8mm
Turbine - OD 59mm, Exducer 50mm

I will try and remember to bring the calipers back from work tomorrow to measure.

[Billman]

I suppose that this k26-6 you are looking is from the old 10v turbo engines.

Also Porsche 944 turbo came with several editions hp ratings and maybe turbo.

Please measure the volvo turbine impeller major and small diameter an tell us (don't recall if it's posted before).

[Ruffiano]

There is some serious miss-information floating around. Dimitri can you look at the hotside on that one and get the casting numbers?

Here is what i know.

I bought a URS4 to build my S2 conversion, the person included a turbo which was stated as being "an rs2 hybrid" which i posted pictures of it a few years back and everyone said it looked like a stock k26 turbo. It was recently rebuilt and i just put it on the shelf in my garage for a long time, the information about it being a rs2 hybrid was second hand information at best.

I bought a Volvo k24 7400, removed the hotside and removed the hotside from that spare turbo that was sitting in my garage. I had called around to find out if anyone would machine my hotside to properly fit my new turbo, everyone said they wouldn't talked to my good friend and fabricator Hank and he said to bring it down to the shop and we'd have a look. after a few measurements we realized it seemed like the perfect fit, so check clearances with plastigauge he set the hot side and everything was spot on.


Fastforward to 8 months ago. i bought a second Volvo k24, found a for sale ad on motorgeek from a guy selling a bunch of misc stuff, he had a k26 hot side listed, picked it up for about 40 bucks shipped, and i put it on my second k24-7400, it again was a perfect fit. Not sure what EITHER of these hotsides truely came from but I would ask demtri to look at the one i sent him to see what the casting numbers are so we can get a definitive answer.