Thermostats.

 

In previous tech threads the thermostat has been looked in some detail, in the main about ones stuck open and the subsequent low temp running issues which can lead onto lowered performance due to safety boost operating as the ecu considers the engine too cool to allow full boost and of course this uses excess fuel too, here we deal with NON GENUINE thermostats.

 

So check out the two photos below, the stat on the right is an old but genuine Nissan unit, the unit on the left a non genuine new (ish) unit removed from a zed earlier this week with the cool running issues.

 

The preferred normal running temp for the zed is 80C this is essential for safe and full running, the genuine item has a set opening rating of 76.5C this allows a small amount of overrun to the ideal 80C no after market stats are easily available at the correct temp rating. The item in the photo on the left is rated at 65C so with a few degrees overrun the running temp at idle was around 69C to 70C some 10 degrees less than ideal. But when testing on the road with extra air flow through the rad as well as a faster spinning water pump and fan blade the on the road temp was dropping to 60C occasionally and well into safety boots area.

 

Ok so with no after market stats the correct temperature its another reason to stick with Nissan only parts, Nissan recently raised the price on these by almost 300% but do not be tempted to save a few quid on a spurious one ..just not worth it, of course you may well have a spurious one fitted without knowing it. :cry:

 

 

Edited November 13, 200916 yr by JeffTT

how come nismo made one that opens up at 65d :xxx:

Thanks for this Jeff, glad I decided to stay OEM received my Nissan stat from you (DTA) the other day, cheers. :D

 

H

Edited November 13, 200916 yr by bigh

how come nismo made one that opens up at 65d :xxx:

 

Like many after market parts designed for motorsport but sold to road car owners.

 

Jeff

http://cgi.ebay.co.uk/Nissan-300ZX-Fairlady-Z32-Thermostat-82c-Japan-Made_W0QQitemZ230270508390QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item359d311d66

 

 

That any good???

Get 'em from Specsavers...........glasses that is. The Nissan thermostat opens at 76.5 degs C, which is obviously the recommended temperature.

http://cgi.ebay.co.uk/Nissan-300ZX-Fairlady-Z32-Thermostat-82c-Japan-Made_W0QQitemZ230270508390QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item359d311d66

 

 

That any good???

 

Fraid not.

http://cgi.ebay.co.uk/Nissan-300ZX-Fairlady-Z32-Thermostat-82c-Japan-Made_W0QQitemZ230270508390QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item359d311d66

 

 

That any good???

 

i was going to get one of those as it says its a nissan manufactured one! i take it its not then!:confused:

 

dan.:)

I've never seen the appeal/benefit/desire in using cold running thermostats on engines with stock management. People seem to be hell-bent on getting their cars to run ultra cool without knowing what benefit, or not, this actually has on the engines' running (these are probably the same people that leave their engines running from cold on idle for 10 minutes thinking they are doing their car a world of good!)

 

As Jeff has said, the engines were designed to run at optimum efficiency at around the 80 degree mark. Running the car on a cooler stat messes up the fueling. Will just run rich and won't give the correct power.

Edited November 14, 200916 yr by FunkySi

so what one is best then? the one in jeffs pic says 76.5C and the other one on ebay as a nissan one says 82c!!

 

dan.:)

The oem nissan thermostat is best which runs at 76.5.