Intercooler locations?

[JMA-RUF]

With respect to this picture:



How efficiently would the intercoolers work in these obscure locations?

How much air-flow would these locations see when the car is mobile?

I know the 911 engine fan can move a tonne of air, but I can't see how putting the intercooler in these locations would have resulted in the best efficiency

Anyone care to comment?

[bigrubberjeep]

I know it's a RUF car with tons of money spent on R&D, however the first thing I see is more weight where it does not belong (in addition to the airflow issue)


Now what I have seen, is the inlets to the intercoolers come from the top side of the rear fenders.

[RickM]

Originally posted by bigrubberjeep



Now what I have seen, is the inlets to the intercoolers come from the top side of the rear fenders.

I think this was discussed a few months ago. IIRC, the fender ducts were deemed useless as intakes but did allow air to vent out.

[JMA-RUF]

Originally posted by bigrubberjeep
Now what I have seen, is the inlets to the intercoolers come from the top side of the rear fenders.

Is that true? Why not have the inlets at the bottom and the outlets diagnally opposite, at the top? Surely this would be the better design, and shorter charge air pipes too?

Those cores don't look very big either. Perhaps <=10" at the most

[Emission]

It is a compromise.

The best location is in the front grill (like most turbocharged cars). Tons of unobstructed, cold air.

With a 911, making the compressed air travel from the turbo (in the back), to the front, then to the back of the car is very inefficient (you'd lose a ton of boost while you try to pressurize the system). You have to keep the intercooler in the rear.

The CTR has two turbos, one on each side, so keeping the path of compressed air short, and keeping lots of open space in the engine compartment for fresh air circulation (like they have), seems to have worked best.

For a single turbo, I think the best is a single large intercooler on top of the fan.

[Emission]

Originally posted by JMA-RUF
Is that true? Why not have the inlets at the bottom and the outlets diagnally opposite, at the top? Surely this would be the better design, and shorter charge air pipes too?

Those cores don't look very big either. Perhaps <=10" at the most

In later CTR's the inlets were on the bottom.

[bigrubberjeep]

I always thought a good place for the oil cooler or intercooler would have been right where the rear fender arch starts from the front to the back. (where the rock protection sticker go's)

Kind of the same place where the vent/fins are in a slant nose 911.

[RickM]

Originally posted by bigrubberjeep


Kind of the same place where the vent/fins are in a slant nose 911.

Yes, the brake vents. Prone to damage from road debri though....and hotter air going to the brakes.

[JMA-RUF]

I also notice the right intercooler is in the location where the filler neck is for the oil tank.

In some pictures I see a flapper door just beside/behind the right hand door. Would RUF have relocated the factory Carrera oil tank to the inside of the body in this location, or is a custom oil tank used?

[Emission]

Originally posted by JMA-RUF
I also notice the right intercooler is in the location where the filler neck is for the oil tank.

In some pictures I see a flapper door just beside/behind the right hand door. Would RUF have relocated the factory Carrera oil tank to the inside of the body in this location, or is a custom oil tank used?

RUF relocated the oil filler. I have a pic if I can find it...

[JMA-RUF]

Wouldn't the whole tank have been moved, since the turbocharger sits on the side of the engine?

[bigrubberjeep]

From what I have seen they relocated the oil filler door to where the 74 911 had it (behind passenger side)

[Emission]

The oil filler is just behind the passenger door, in front of the NACA scoop.

(Yellow Bird photographed next to my car!)

[JMA-RUF]

Great photo! I envy you, that you've seen one in the flesh. Nice Turbo too

Wouldn't the whole tank have been relocated, not just the filler? Otherwise, how did RUF fit the turbo on the side of the engine with the tank there? I'm confused

[Emission]

I don't know the answer to that one. I will see Yellow Bird again in a couple weeks... I can take a better picture of that area (oil tank) then if someone else doesn't know.

[JMA-RUF]

Thanks Emission.

Would appreciate it if you can get some photos under the engine. I'd be interested to know what type of turbochargers the CTR uses. I read they are K26's, but I don't believe it for a second. A pair of K26's would make the thing a lag monster @ only 3.4L capacity.

[Emission]

Originally posted by JMA-RUF
Thanks Emission.

Would appreciate it if you can get some photos under the engine. I'd be interested to know what type of turbochargers the CTR uses. I read they are K26's, but I don't believe it for a second. A pair of K26's would make the thing a lag monster @ only 3.4L capacity.

I'll shoot the turbos too.

[dean]

Originally posted by JMA-RUF
With respect to this picture:



How efficiently would the intercoolers work in these obscure locations?

How much air-flow would these locations see when the car is mobile?

I know the 911 engine fan can move a tonne of air, but I can't see how putting the intercooler in these locations would have resulted in the best efficiency

Anyone care to comment?

To figure out intercooler eff. you have to do some measurements. Temp drop and boost drop.

I would guess there isn't much air going thru those intercooler but if you were to block the deck lid opening there would be.

Dean

[JMA-RUF]

Originally posted by dean
I would guess there isn't much air going thru those intercooler but if you were to block the deck lid opening there would be.

I would have thought so too, however, if the CTR was running a base boost pressure of 1.1bar (or 15.7psi) and was reliable at that setting, then we can't really question the designer's decision to mount the intercoolers in those locations.

I do remember reading the standard setting is 1.1bar, however, it was adjustable to just over 1.2bar (18psi) for approx 520HP.