there's an article on them in this month's racecar engineering magazine that looks like it could be interesting

 

The compressor versus turbine housing size on most WRC turbos always amazes me, turbine housings that make T2 ones seem huge, and compressors that make T4 ones seem small.

 

ive never read racecar engineering

 

I read it from time to time, will look out for that one

 

Because the engines are designed to take HUGE boost in the mid-range and fek-all at high rpm, so don't need out-right flow in the turbine (due to the poxy restrictor).

 

must be specced fucking good to not surge tho with the incredible size differences.

 

You should pal.....

 

It's a quality read Gareth. I haven't seen it for a while though.

 

I believe it is subscription only now-a-days?

 

Makes a nice pressie at xmas though Mike...

 

Ian,
I have been a subscriber for 3-4 years .

 

Much like my old MD240 was....

No surge at all!!!!!!!








































As long as you didn't actually start the FUCKING ENGINE! I'm sure I heard that cnuting thing surge at idle once

 

still available in Borders. in fact most Borders have a Starbucks upstairs so you can read it free over a coffee

 

ahh thanks guys,, i didnt know you cared that much

 

not all that interesting an article after all, as all they did was talk to owen developments about what they do, and they are not the be all and end all in the world of turbocharging

what was interesting was that the WRC turbos use roller bearing cores

and that due to the restrictor, the compressor wheel tends to be built especially deep rather than large diameter. so what looks like a small compressor wheel in terms of diameter will still have a high volume flow rate due to it's overall volume pushing ability from it's greater depth

 

Nick,
Lately it seems that a LOT of articles have been written like this - as in by a particlular supplier, more as an advert .

 

not ideal is it mike? we want proper journalism with a proper objective look at a subject with more than one view point. you're completely right that it was almost entirely written by the featured company and the author didn't even contribute any opinion

 

Nick, fair enough BUT a vist to the place (nr Oxford) may change your mind about the company. It's deeply impressive.

They work closely with Prodrive, and when I was last at Owen's they we're building a batch of 32 WRC turbos (for Subaru rally cars) at a cost of £ 13.5 K per turbo

Owens do all their turbo testing/mapping on a Hoffman in house dyno (rolling road) with custom electronics/retarders. Those 4WD rollers are good enough for over 1200 BHP. Many race cars, including GT cars are mapped at up to 200 MPH sustained speed. The cooling fan is huge - with good flow/air speed due to it being a sealed cell with air exit at the far end.

 

i'm not saying that they don't know their onions doug, as clearly they do if they are supplying prodrive

i'm just saying that they are not the only ones doing what they do and more objectivity would have been good in the article if they had talked to another company (possibly even one of the turbo manufacturers)