Modifications to reduce head gasket failure risk

Topics relating to the Lotus Exige S1 (series 1)
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deggles
Posts: 222
Joined: Tue Feb 26, 2008 12:22 pm
Location: Leeds

Stitches wrote: Thu Jul 21, 2022 2:53 pm Thanks for that. Will check the fan works as you kindly suggest. Is there an approximate temp range whereby the fan should kick in whilst stationary?
Hi, I think it should kick in around 104 as standard, or 92 if you have the 190 ECU. This is measured by the brown sensor at the ECU so might vary slightly from what you're seeing on the dash (blue sensor feeds the stack). :thumbup:
Stitches
Posts: 12
Joined: Mon Nov 09, 2020 10:12 am

Cheers! :thumbup:
C8LGY
Posts: 80
Joined: Thu Jun 13, 2019 10:27 pm

Stitches wrote: Thu Jul 21, 2022 2:53 pm Thanks for that. Will check the fan works as you kindly suggest. Is there an approximate temp range whereby the fan should kick in whilst stationary?
Yes, so I believe it’s the standard cut-in temp (102-104 C) for the 177 bhp, and 92C cut-in for the 190 bhp ECU; cut-out will be a few degrees less.

If you’ve got an OBD reader plugged in that will give you the exact temperature that the ECU is seeing. If you’re going by the Stack temperature, it may show 3 or 4 degrees difference, and read high if there is any electrical load.
Stitches
Posts: 12
Joined: Mon Nov 09, 2020 10:12 am

That's really helpful, thank you
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