anto1150

good to know... it's going to be my next mod

mojorizing

I added the 2.2K ohm resistor to the CCU PCB from points connected to G12 and G18. Will test when car back together - presently replacing cam cover gaskets.

Laker

I would so screw that up and glad I added it at the oil cooler sensor. Nice (steady) work!!!

Andy Roe

I was thinking of adding the manual override switch, but I've just found this thread and ordered some resistors. This is a great mod and just what I need before the Italian summer gets going as the car got too hot too often last summer!

ToSi

Clever idea, have a suggestion though:

Instead of cutting up the stock wiring harness, buy a couple of connectors & make a removable jumper that includes the resistor. The temperature sensor (along w/ many others in these cars) are plain Bosch EV1-style injector connectors which makes it easy to find male & female sides.

female -> http://www.bmotorsports.com/shop/pro...roducts_id/943
male -> http://www.bmotorsports.com/shop/pro...roducts_id/570

Both available as bare connectors or as pigtails w/ pins already crimped (here)

Andy Roe

Yes, good idea! I've just bought a set on eBay!

Laker

You don't need to cut the stock wiring harness. You simply have to remove some insulation on both wires and run the resistor across the two bare spots. If you want to reverse, you just have to remove the resistor and cover the bare wire with electrical tape or whatever.

geordie

Great thread!

Have added a link to a 964/993 oil cooler fan operation and trouble shooting article that may assist others.

http://p-car.com/diy/fan/

HiWind

thanks for the pics V, RR et al ... just unsure about something: if you don't have a CCU anymore, how is the fan being controlled? Must this mod be done elsewhere in that case?

koenig_roland

i made an adapter for that resistor hack:







with EV1 plugs male/female

mojorizing

This poster had a answer to that>>>
https://rennlist.com/forums/964-foru...er-sensor.html

HiWind

^^ thanks Mojo .. I'm confused as I don't have a CCU yet temp rarely gets above 9oclock except after 10-12 laps at the track on a hot day .. upto 10-10.30
... is my fan maybe not even engaging as CU and front suitcase removed??

mojorizing

From those temps, I would think your fan is working, but due to some modification if your CCU has been removed.

HiWind

thanks - will check it out but I haven't done any mods to the fan and I removed the CCU and suitcase .. hmmm

HiWind

is .25W too low?
my shop doesn't have the metal film ones in .5 or .6W