924Board.org

simsport · Joined: 06 Nov 2002 Posts: 573 Location: UK Warrington

I have a front mount and I can get high temps in the supercharged car. I have an electric pump and no stat so it aint those!

I now think its because the intercooler is too far away (3-6 inches angled back from the top) from the radiator.

Your natural instinct is to keep it away to avoid picking up heat. However all you actually do is upset the airflow through the radiator. Much better to keep them close and encourage a smooth airflow. I got this advice from an intercooler manufacturer via the Tech Editor of CCC mag in the UK so I think its solid advice.

I'm going to move my rad up tight and level behind the intercooler.

Cheers
Simon
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Blown is always best!

numbbers · Posted: Thu Jul 21, 2005 10:43 am Post subject:

Well, since you are running an intercooler, I will guess that you have the boost cranked up. Higher boost equals higher heat in the cylinders, and a hotter running engine. If your intercooler is air-to-air, it will only cool the charge at speed. So, around town, in traffic, you will be running hotter. This is exactly what happened with my 931.

The problem is the radiator. The 931 uses the same radiator as the NA. It will not handle the increased heat load of higher boost.

The solution, I installed a 951 aluminum radiator. Now, I seldom get above 1/2 on the guage, and even on 100 degree days, I don't get above 3/4. I bought mine off of ebay for less than $100 US, and installed the 951 fans also. If you decide to go this route, PM me, and I will tell you the mods necessary to fit it.
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1980 924 Turbo

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

Yes you read my mind I want to get an alu. 951 rad., are the hook ups all the same, a new one I was looking at appeared to have the temp. Sensor on the other side. Well if you would tell me what you had to mod to get it to work that would be great. Thanks Heath

numbbers · Posted: Tue Jul 26, 2005 10:30 am Post subject:

I posted a PM in response to both of you on the mods you will need to do, but thought I should put a response here for others that may be interested.

The connections are slightly different, but all of the hoses from your 931 will reach. However, the 951 radiator has plastic tanks, so the hose fittings are plastic also. Because of that, they are thicker than the brass fittings on the 931/NA radiator. So, you either have to stretch the diameter of your 931 hoses, or use adapters. I made adapters using short pieces of the 951 hose, and the brass fittings from an old 931 radiator. I just unsoldered the fittings with my propane torch, and clamped them in. So, for the two main hoses, I have three hose clamps on the radiator end. One to attach the larger hose to the radiator fitting, one to attach the adapter to the larger hose, and one to attach the 931 hose to the adapter. They are all right together, and you don't actually see the fitting, as the hose(s) covers the adapters. The smaller hoses fit without adapters.

The 951 fan temp switch has a three wire plug on it, while the NA/931 switch uses a two wire hook-up. However, the threads are the same, so I just replaced the 951 switch with my low temp switch from my old radiator.
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1980 924 Turbo

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

hey thanks Numbbers, i found a radiator and its on the way, i should get it in a few days, than its time to switch it out and pitch that old useless stock rad. it will be really good to be able to drive the car again without having to worry about it overheating haha hopefuly this will work. i mean everything else has been replaced so it was too.

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

hey thanks numbbers for the info. i just got mine in last night, it fit pretty good. I got a set on 951 fans but they seem to be tired, one makes noise and both dont flow very much. i took the car for a test drive today its around 101 so its hot, all and all it is a lot better when the car is moving, wont go over first mark, i like that, but it goes up when stoped at a idle. i think its because the fans arnt strong enough. So i think i am going to get a aftermarket one? seeing how they want 215.00 for each fan new. Plus it should flow a lot better. But i dont know what type, pusher or puller anyone know what type the factory fans are? i think they are a puller, can anyone tell me for sure.

cleethorpes · Posted: Fri Aug 05, 2005 8:34 am Post subject:

if they are the engine side they are pullers, if they are in front they are pushers?

or have I missed the point here?
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'24 turbo with dodgy gt bodykit......needs a new home

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

ok thanks thats what i thought, just wanted to make sure.

numbbers · Posted: Sat Aug 06, 2005 10:30 am Post subject:

MP, keep us posted on how the aftermarket fan works out. I might try it, if it helps cooling. I used to live in Merced, so I know how hot it can get in the Valley.
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1980 924 Turbo

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

will do. plan on installing today or tomarrow, that i will see how it works

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

Try putting the thermostat back in. That should force all of the coolant through the radiator even when at idle.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

Well I got the fan in yesterday and took it for a test drive today. Wow what a difference, this thing really moves a lot of air. It felt like it pulls a lot more that when both of the old fans are on, and the new one is a single unit. I couldn’t get it over the first line one temp. Gauge. I was driving pretty hard, and it was 102 out, I am happy, much better than before. I also wanted to see if it could cool when not moving at idle to I switched the fan off and let the temp go up to the third mark that I turned it on and in a few minutes it went down to the first mark. I would say it works pretty well. Some info on the fan I used incase someone wants to know. I got it from Summit racing, it a Darale part # 16514 , Sum#DER-16514 cfm 1350 @1730rpm the fan is 13.87 in high, sold as a 14 inch and it fit prefect in the 951 rad. just had to cut the lower middle mounting tab for stock fan. I am happy now that the car will stay cool at last. One other thing I am going to get it they sell an adjustable thermostat for the fan, so you don’t have to worry about switching it on and off all the time. Also I tried to wire the fan using the original plug wire but am not enough amperage to run the fan so I had to run one right to the battery, much better.

Paul · Posted: Wed Aug 10, 2005 10:58 am Post subject:

Great news.

Get rid of the stock fan wiring.

All the radiator thermoswitch does is to provide a ground.

A relay has 2 circuits. One that provides a on/off switch and 1 that feeds a solenoid that opens or closes the switch.

So, I would run a fused wire from the battery to a normally open relay and wire it to one side of both the switch and the solenoid connectors.

Then run a wire from the other side of the relay's switch to your fan's + terminal. Then run a small wire from the other side of the relay's solenoid connector to the radiator's switch. Ground the fan's - terminal.

When the switch hits it's trip point, it will provide a ground to the relay's solenoid, the solenoid will close the switch and the fan will run.