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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 09-03-2010, 04:08 PM
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Palantirion Palantirion is offline
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Thermostat question

I have been told by ESS that at least one of their F/A Z4 M customers has had luck reducing his on-track operating temperatures by replacing the stock thermostat with a 55C thermostat. I do not understand why this would have a beneficial effect. All the thermostat does is regulate when the cooling path is opened. So if you open it earlier, it starts cooling sooner. But if your cooling system isn't sufficient your car would still overheat under track conditions - only slightly later in a session. Also, wouldn't running cooler temps on the street make it harder to pass smog?

What am I missing?
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Old 09-03-2010, 05:09 PM
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I believe the 55C thermostat he/she is talking about is a Motorsport part with better flow characteristics when it's wide open. Or perhaps the thermostat that was replaced wasn't fully opening.
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Old 09-08-2010, 11:03 AM
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Palantirion Palantirion is offline
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Originally Posted by dwm View Post
I believe the 55C thermostat he/she is talking about is a Motorsport part with better flow characteristics when it's wide open. Or perhaps the thermostat that was replaced wasn't fully opening.
-Thanks for the suggestion, that's something I hadn't thought of.

I've done some research, and according to my motorsport contacts it simply opens earlier than the stock thermostat. So we're just going to install the oil diverter valve and see how that works.
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Last edited by Palantirion; 09-08-2010 at 11:04 AM.
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Old 09-08-2010, 11:19 AM
Drivewfo Drivewfo is offline
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Drill a small hole in the flange of your thermostat. That will help any trapped air escape.
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Old 09-08-2010, 11:24 AM
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Originally Posted by Drivewfo View Post
Drill a small hole in the flange of your thermostat. That will help any trapped air escape.
-An interesting idea. Does this advice come from theory or personal experience? And do you have any pics?
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Old 09-08-2010, 08:32 PM
Drivewfo Drivewfo is offline
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Originally Posted by Palantirion View Post
-An interesting idea. Does this advice come from theory or personal experience? And do you have any pics?
I've always done that on my engine builds for my drag car. I used an 1/8" bit and just picked a spot on the flat flange area. Doing that plus jacking up the front of the car such that the radiator filler neck is the highest point of the cooling system (remove cap and let the engine run a few minutes) gets all the air out of the system.

Here's an example pic I found on Google showing the drilled thermostat on a small block chevy:
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Last edited by Drivewfo; 09-08-2010 at 08:34 PM.
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