924Board.org

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

I am needing a little more cooling capacity and I was wondering if the 944 radiator is actually any better than the stock 924? Anybody do this? I assume it is not a bolt in either but was it much work? Are the A\C models any bigger? Thanks,

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

emoore924 · Joined: 13 Apr 2004 Posts: 2822

Yes it is better. Much better.

It bolts in, sort of. And, YMMV but I had to splice the hoses to fit because the 924 hose didn't fit the 944 radiator fittings. I used a couple of those little plastic resizing splicer tube things. I have the numbers for the two hoses that worked for me. If you need them, LMK and I can go hunt around and find the numbers.

moliver · Joined: 17 Dec 2002 Posts: 59

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Duel fans and lower temp fan switch make all the difference in the world.
If you are not running 2 fans ,make that jump first.

I read the 931 Rad is the one to go to if your upgrading.
Did you put in an oil cooler?
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1978 924 95 mile daily driver.
Audi TB/POR174M/High Flow Cat/2.25" exhaust
I knew that positive thinking thing wouldn't work.

81turbo · Joined: 03 Nov 2002 Posts: 1065 Location: Oakland, CA

The best thing I did my my cooling system in the 931 was replace the fans. It stayed much cooler after new fans were installed.

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Thanks for the tips. I am running the A|C style dual fan setup and this did help but after going to 10lbs boost I started to heatup last summer when temps went above 90°F. I know I am having some airflow problems due to the size of my intercooler. It is the same size as the radiator. I have since installed a second blowoff\bypass valve to help bleed off the heated air before it enters the intercooler at cruise speeds. This should help some.

I think I might try the aftermarket fan setup first as it will also free up some room under the hood and I can still use them on a larger 944 radiator later if needed.

An oil cooler needs to happen either way.

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

leadfoot · Posted: Wed Dec 20, 2006 8:21 pm Post subject:

My oil cooler helped reduce water temps considerably, but the best mod was to bypass the cermaic resistor and run the fan from a relay directly from the battery, this improved airflow by at least 30%...
Does megasquirt have an auxillary output you could run the fan off??
Leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Ozzie · Posted: Wed Dec 20, 2006 9:28 pm Post subject:

The resistor is bypassed by the fan relay when the ign is on.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Lizard · Posted: Thu Dec 21, 2006 1:55 am Post subject:

augidog the 931 rad is the same as the 924 rad,
if you wish to upgrade the 944 rad is the way to go. It will keep your temps cooler, though I would recommend that you install a very cool thermostat and a lower fan temp switch, and wire the fans right off the battery as there is voltage loss with all the factory wiring.
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3 928s,

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Leadfoot, the MS I use can be used to control the fan but I need to do some board mods. I can do these when I modify it to take over my ignition.

I think you improved your airflow because you bypassed your stock wiring as Lizard pointed out. I have already done this and it did make a noticable difference in fan speed.

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

leadfoot · Posted: Sun Dec 24, 2006 9:57 am Post subject:

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana