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Overheating issue - need advice

Hi,

Need some advice with my overheating issue when I'm at the track.

I have a EFI modified 930, with 505 whp & 635 Nm at 1 bar.

There is 2 fender mounted Fluidyne oil coolers in the front fenders. Engine oil cooler is removed and a 993 oil filter installed.
I have a Mocal Oil Thermostat in the rear.

At trackday engine goes up to 250, and this is where I take slower rounds to cool down.

I would think that 2 fender mountes oil coolers should be enough.

Could it be that the Mocal oil Thermostat is not closing enough and let some of the oil back in the engine ?

I will remove and test the thermostat.

Will I need to install a front mounted oil cooler?

Here is a pictures from the front. Should me enough airflow, right?





Left front fender cooler

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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 05-30-2014, 03:49 PM
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Posted in Autocrossing and Track racing forum as well

overheating issue - need advice
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 05-30-2014, 03:50 PM
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Even with two of them, that is nowhere near enough available airflow for the coolers to be effective at the track (especially given the heat your big HP engine is generating) - you definitely need a front mounted cooler, with sufficient airspace behind it, to cool things down to the optimum, 220F range.
Old 05-30-2014, 03:52 PM
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Daily street use, oil temp low 180.
Only track days that I have issue, so I guess to check thermostat and possibly add center mount cooler.
A lot of work since also the bumper needs to be modified
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 05-30-2014, 03:52 PM
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That's interesting about the low 180 daily use - the OEM, fender mount thermostat would not even be open with those too cool oil temps (doesn't even start to open until 186F). . .
Old 05-30-2014, 03:56 PM
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GJF GJF is offline
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I Have the biggest Fluidyne unit up front I think it's the airbox 650. I cut the -12"s off and changed them to -16's. I beat the crap out of it and temps always are sometimes too cool 180 degree Mocal T stat. I have been thinking of changing the Mocal thermostat to the 212 degree unit for aviation since it runs a little on the cool side even in the hot Florida weather. I have the same console with no engine cooler and just the single air box 650 in the airdam.

Last edited by GJF; 05-30-2014 at 04:07 PM..
Old 05-30-2014, 04:01 PM
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This is even with the new A/C condenser in front of the cooler with (2) 8" Standyne fans.
Old 05-30-2014, 04:10 PM
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Next time after you track/drive your yellow beast (before checking out the thermostat) see if both oil coolers are really hot. If they are then the thermostat is most likely to be working properly. Do you have fans for the oil cooler? If not then maybe add the fans? Also, are there any ducting to force the air through the oil coolers via the openings in the front bumper? This should help but am not sure if the openings in the front bumper are too small. Is the right oil cooler the same type and size at the left? If yes, then those should keep the temp in check. That's how mine are set up by the previous owner who tracked my car.
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Old 05-30-2014, 04:31 PM
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Both cooler are really hot on track use.
Yes, there is ducting to lead air to the coolers, and all gaps around the coolers are closed.
Both cooler are of same type.

There is a lot of of heat generated from this engines on boost, and on track use, boost is there a lot of the time
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 05-30-2014, 11:49 PM
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Check the pressure differential across the coolers. You need low pressure behind the cooler! Maybe try water injection on the engine or water mist on the coolers?
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Old 05-31-2014, 01:59 AM
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^ i've seen some people have a water mist setup into the engine fan, could help?
Old 05-31-2014, 02:16 AM
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I was having similar problems with my '86 930 at a hot track day at Pocono Raceway. We did the full tri-oval and my oil temps were hitting about 270 degF. Ended up installing a center mount B&B oil cooler. Removed the fender mount cooler. Have never had an oil temp issue again. Once it reaches thermostat setting, it never budges.
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Old 05-31-2014, 04:26 AM
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Front valance oil cooler is the way to go. You can try ALL of the above with marginal help... If u really want to solve the issue, install a front cooler.
Old 06-02-2014, 05:55 AM
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+1 with Miguel. keep passenger side cooler and add a large front and you will be fine
Old 06-02-2014, 06:15 AM
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we have a solution...Our K3 never goes above 180.
Horizontal Fan Kit
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Old 06-02-2014, 08:21 PM
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Thanks for input. Feel like the front cooler is the way to go :-)

Will be fun project to modify the 964 front bumper to take a front oil cooler :-)
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Trond R.
1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
1972 914-6 GT replica project
1986 944 Turbo
Old 06-05-2014, 12:47 AM
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performing DE's in the summer in the VA area (Mid to high 90's), my 930 prior to installing a center mount was close to red every time... Now it is down to where it should be...Huge improvement...You will be so glad you did it...

I was talked out of getting fender mounted because of the air restriction my car would have provided.

I am actually thinking about adding this "Finned Oil Lines" from Elephant racing to my setup. Great concept and anything to keep my car cool is a blessing...
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Old 06-05-2014, 07:12 AM
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Will start my front oil cooler project soon.
Have 3 options, RX-7 aftermarket cooler, RSR and a bigger Modine cooler.

The RSR cooler is used, while the other 2 are new.
Bigger is better, so I guess I can leave out the RX7 cooler

Will see which one that fit best since I will modify the 964 bumper

Old 06-10-2014, 11:09 AM
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Luv my rx7-oil cooler- with braided lines and fittings- very cost effective. I don't take the car to the track, Drove the car this weekend-temps high 80's / gauge barely went over the 1st line...A lot of top end runs...

I would probably go with the biggest cooler...
Remember you have to make brackets and have enough space for that taller one to fit. It will be tight. GL

Last edited by wjfk32; 06-10-2014 at 11:43 AM..
Old 06-10-2014, 11:37 AM
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Go as big as you can, an inch between the cooler and the tub is sufficient air flow... the height can always be taken care of with a notch on the bumper.
Old 06-12-2014, 01:41 PM
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