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924-76 · Joined: 05 Jun 2006 Posts: 1489 Location: Ontario, Canada

In order to help manage the heat generated by higher boost (12lbs vs. 6lbs) along with the CGT intercooler, I’m looking into upgrading the cooling systems on my 924 turbo and need some advice.

-Coolant system: -currently have stock 924 turbo rad and fans
-want to upgrade to 951 rad and fan, thoughts?

-Oil cooler:-currently have stock 924 turbo oil cooler
-would like a bolt on larger cooler, suggestions? thoughts?

Feel free to add your 2ȼ
Thanks
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP

pcelenta · Joined: 16 Feb 2007 Posts: 546 Location: long island,ny

one thing you might want to consider is adding something like the CGT radiator cooling duct work. If you have the euro 924 workshop manual you will see some detailed photos on how it is configured. I am not sure what you are running for a bumper/spolier on your car..but on the CGT it is duct work to push more air up into the radiator from the middle part of the front spoiler. unfortunately, the parts are NLA but are fairly simple folded pieces of metal.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Here's my two cents (although it costs more than two cents):

Custom rad (thicker core, increased capacity):

Custom fan setup (modern efficient fans, higher cfm with lower draw):

Belly pan (improves flow through radiator at speed):

All of the above is 100% bolt in, stock hoses size and location, nothing hanging past the body, etc.

As for the oil cooler, I would stick with the stock unit. I think it is a very high quality piece that is well integrated into the car. The only thing I might consider is adding ducting around it to improve air flow.

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Agree with all that's been said, plus lower range t-stat and fan switch. I've done this on all my turbos and I like it because the fans come on early and prevent the car from every getting into the death spiral heat soak. That, and add water wetter.
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erstwhile owner of just about every 924 variant ever made

924-76 · Joined: 05 Jun 2006 Posts: 1489 Location: Ontario, Canada

Thank you for your input

-Ducting is definitely a good idea and will make some for the oil cooler.
-The rad and fans looks good but a bit out of my budget, I contacted Ran Davis and they are asking $766US for the rad.

The reason I mentioned the 951 rad is because I believe they are better than the stock 931 and I have one in the garage. All I would need is the fans and shroud from a 951, which again I would assume that they are better that the 931. Thoughts?
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Yes, 951 rad and fans will be better than 924 but not as good as a custom setup. The 937 has the same rad and fan as stock NA 924, and it does just fine with 12 psi of boost and hard driving. No reason the 951 setup shouldn't work for you.
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erstwhile owner of just about every 924 variant ever made

DZGunner · Joined: 18 Nov 2014 Posts: 191 Location: Great white north

When you guys say custom fan set up, are you saying you guys made them yourselves or you know of a vendor? I used to have a custom twin fan upgrade on my 928 and would love to find something like it for my turbo as well.

Also what exactly turns the fans on? Is it the sensor mounted on the radiator or one of the ones on the back of the head? Did you mean a manual switch or a lower activated temp switch?
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1979 924 (Daily driver EFI)
1979 924 Sebring
1977 924
1977 924 (Parts)

Cedric · Joined: 27 Aug 2004 Posts: 2818 Location: Sweden

The most important question, how is the car used, street or track?
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1980 924 Turbo
www.instagram.com/garagecedric/

924-76 · Joined: 05 Jun 2006 Posts: 1489 Location: Ontario, Canada

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

My red car has a K27 hybrid turbo running up to around 1bar. I drive fast sometimes and i have no cooling problem...its the standard 931 cooling system.
If you are racing the car in the summer then you can have a problem.
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Supercharger and EFI kits
https://www.the924.com

Cedric · Joined: 27 Aug 2004 Posts: 2818 Location: Sweden

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Not really sure if 951 unit is "better". . .it does slightly increase capacity and is lighter, but an aluminum core does NOT cool better than the 931 part. And doesn't the 951 piece hang below the body work, or was I wrong about that?

You might also call around Ontario. . .there could be a radiator shop that can produce a custom rad cheaper than Davis.