lower fan start temp.

vxc · Post by **vxc** » Sat May 09, 2009 5:44 pm

Was wondering if theres a bypass to bring the fans on earlier on the s2 exige.

I know theres a kits for the k engine,

Jacobite · Post by **Jacobite** » Sat May 09, 2009 6:01 pm

I don't know if its switchable on Lotus's ECU OR If the dealer would switch it for you. I know that on the hondata/ Omex you can
Geary at Eliseparts sell's a switch to bring the fan on at a lower temperature but it only mentions K series
Ronin has a response on his forum accross the water

http://www.monkeytuner.com/forum/viewto ... fan+switch

Alternatively it might be worth PM ing Craig(r10crw) to see if he had issues with his Exige S is CC and obviously S/C too
cheers Hamish

robin · Post by **robin** » Sat May 09, 2009 7:11 pm

It can be done on any elise I believe. The fan is controlled by a relay. One side of this relay is connected to the battery (possibly via the ignition switch). The other side is connected to the ECU. When the ECU wants to turn on the fan, it connects the relay to ground, energising the coil and closing the contacts, thus turning on the fan. If you want to turn on the fan, connect the relay to ground and the fan will start. Bob Van M has the relay connected to a switch in his car and uses this to force the fan on to help cool the car more quickly after being on circuit.

Why do you want to lower the temperature, though ... it's probably set more-or-less optimally for emissions/fuel economy as it stands?

Cheers,
Robin

vxc · Post by **vxc** » Sat May 09, 2009 10:57 pm

would jsut like to have the option i think....

105 degrees to kick in seems like a heart attack!

robin · Post by **robin** » Sat May 09, 2009 11:32 pm

Yes, I'm pretty sure it should start lower than that - have you confirmed with Lotus that 105 indicated is the correct temperature for fan operation?

Cheers,
Robin

vxc · Post by **vxc** » Sun May 10, 2009 2:44 am

good point i havent but i read somewhere i think.....either here or seloc....

j2 lot · Post by **j2 lot** » Sun May 10, 2009 9:01 am

Pretty sure the fan is set to kick in at 105. Thats where it used to start on my 111R.

Edin430 · Post by **Edin430** » Sun May 10, 2009 9:34 am

Mine kicks in at 103/104 but that's an N/A not and S...

robin · Post by **robin** » Sun May 10, 2009 9:21 pm

Sounds like it's right then - they must run the engine at higher temperature deliberately? I would be wary of making it cooler without understanding why Lotus/Toyota chose this running temperature for the engine.

Cheers,
Robin

Gourlay83 · Post by **Gourlay83** » Sun May 10, 2009 10:31 pm

If you do want an adjustable fan controller, i just fitted a Revotec to my S1. Set it to what ever you want. I wired mine into the original Fan relay, simple enough job.

Alan

vxc · Post by **vxc** » Sun May 10, 2009 10:51 pm

tbh its never got higher than 98 i think..

so av never heard my fans on....

way to test?

robin · Post by **robin** » Mon May 11, 2009 7:50 am

Gourlay83 wrote:If you do want an adjustable fan controller, i just fitted a Revotec to my S1. Set it to what ever you want. I wired mine into the original Fan relay, simple enough job.

Alan

You need to wire this into the wheel speed sensor too I think? It needs to make sure it doesn't run the fan when the road speed is too high.

On the S2 the ECU sees the wheel speed input and so knows not to run the fan when the road speed is too high.

You can test the normal fan setup by just sitting in neutral at 2,000 RPM for 5-10 minutes - it'll soon heat up

Cheers,
Robin

tut · Post by **tut** » Mon May 11, 2009 7:58 am

Just remembered that I have an adjustable control on N1 that was fitted when it was converted.

Its a small rheostat that turns through 270 degs.

tut

Scottish Elises

lower fan start temp.

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