bebbetufs

I've removed the stock ps fluid cooler to get room for my larger oil coolers. What size cooler should I replace it with? It will have to cope with track conditions.

TonyG

Probably nothing. Unless you're on the track with big rubber, it's not really necessary (even then it's probably not necessary).

TonyG

Dutch944

So why is there a cooler on there Tony?

TonyG

Well... I wouldn't call 4 coils of 3/8" aluminum line much of a cooler.

It's very much like the 911SC's that had a loop of -12 line as an oil cooler. It didn't do much, which is why it was never used again. Which is why everybody installs a real oil cooler.

And they really don't need to do much because there's simply not a lot of heat generated, nor is there any air even directed over them.

My new LSx 951 doesn't have one. And I'm running 300 Yokohama slicks on the front. There's zero PS fluid issues. And those are about as sticky and wide as you'll ever get on a 951... and I can promise you... the car is pushed hard.

TonyG

mj951

I put dual oil coolers on my turbo a few years ago and used a 10 ROW-8AN cooler for power steering, mounted it in front of the radiator.

TonyG

That's great.

I put the same thing on my last 951.

But after examining the data, there's simply no need for a cooler.

TonyG

V2Rocket

tufs, if you do decide to use a cooler i have a suggestion..
if you have salvage yards look for the 1980s/90s volvo 240/740 cars, they have a small setrab cooler with -6 or so fittings..its mounted in front of the radiator.

see this old post of mine for pictures.
https://rennlist.com/forums/944-turb...l-coolers.html

bebbetufs

Thanks guys.
I'm tempted to go with Tony's suggestion. After all I live in a cool climate and the widest tires I will use in the front is probably 245s if I ever get good enough to handle that much front bite.

Tony, have you ever measured the ps fluid temps? I'm tempted to stick an adapter on the line and see what the temps actually are.

rlm328

I don't have a cooler and running 275s up front with no real problems, but then again I have electric power steering pump and it has a fairly large reservoir.

TonyG

We measured the fluid temps in the reservoir, which you can do very easily. I don't remember what it was (like 5 years ago) but it was no where near the wet or dry boiling point of the fluid.

TonyG

bebbetufs

Thanks Tony. That settles it. I'll go with no cooler for now. I can always add one later if needed.

Dutch944

Oke nice Tony, thanks for the info (again.. ) I won't be reinstalling that cooler than..

Mach 5

I'm pretty sure the soft line between the power steering cooler and the reservoir is leaking on my '86 951. I'm not ready to shell out $180 for a new cooler/line assembly. I also will confess that at the moment, I'm a little too lazy to remove the cooler and attempt any sort of "proper" repair. So, that leads me to this thread. It sounds like I could simply bypass the cooler altogether. In this scenario, I would just run a line from the return line that comes from the rack, directly up to the reservoir. This sure seems a lot easier and cheaper than trying to deal with the cooler.

Am I missing anything here?

Thanks.
Roger

V2Rocket

how about just cutting the crimped end of that hose off the cooler and then running a new piece of hose from the cooler to the reservoir, held by clamps (maybe fuel injection style clamps)?

not under any real pressure and it's clamped at the reservoir end anyways...

Mach 5

I'd still need to remove the cooler to do this, correct? I know I probably should do this, i.e., remove the cooler. This project started with a front end engine reseal, which of course includes, belts, rollers, water pump. When I realized I had to remove the power steering pump to get to the lower balance shaft o-ring, I thought maybe I could deal with the PS leak. Again, just feeling a bit lazy, given all the other stuff I got to do.

Roger