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 Post subject: Thermostat temperature?
PostPosted: Tue Jun 02, 2015 12:22 pm 
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Joined: Sat Oct 04, 2014 6:08 am
Posts: 87
Location: porto
Hey i need your help guys. I'm about to buy a new thermostat, just maintenance and not because something is wrong. Can you guys tell me what is the best temperature for the thermostat? 82 or 88? It is a 94 swift gti

(If you guys can answer too, i installed some 4-1 headers that doesnt have a place to install de o2 sensor, now it is wasting more fuel. How can i fix it?)

Thanks in advance


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PostPosted: Tue Jun 02, 2015 4:07 pm 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
the purpose of the thermostat is to allow the engine to come up to it's operating temp where it is measured by the clt sensor and fed to the ecu. an oem ecu is looking for 88*c to match the factory mapping. that would also let your controls go into closed loop mode sooner and that's where your fuel trim comes from.

on your o2 sensor, weld a bung into the exhaust pipe between the collector on the header and the catalytic converter. make sure that you position the bung between the 9 o'clock position and the 3 o'clock position on the pipe diameter. placing the o2 sensor low in the pipe kills the sensor. :blackeye:

i would only use the 82*c t-stat if you are able to access the mapping to change the clt sensor slope. :wink:

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PostPosted: Tue Jun 02, 2015 4:19 pm 
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Joined: Wed Jan 29, 2014 1:18 am
Posts: 212
Location: Slovenia
i'm using 82°C termostate (1991 mk2 Eu market with F5 ecu if its important) and engine is running on much cooler temperature than it is while fan is turned on..

if ecu is programed for 88 then i would go for 88°C termostate.. except for rally use - atleast for roads around me.. there is lot's of low gear uphill parts..


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PostPosted: Tue Jun 02, 2015 6:24 pm 
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Joined: Sat Oct 04, 2014 6:08 am
Posts: 87
Location: porto
Thanks for the answers! Why is there a 82ºc option if the ecu cant match it?


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PostPosted: Tue Jun 02, 2015 6:51 pm 
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Joined: Wed Jan 29, 2014 1:18 am
Posts: 212
Location: Slovenia
i have no idea.. my old one was "dead" so i ordered new in local shop.. only thing i told them is "suzuki swift gti, g13b engine" new one was from "jakoparts" and it's 82°C.. old one was 82°C too and from state in which it was i asume it was in car for really long time (200k km on clock..)

maybe anyone know if there is difference from ecu to ecu? like F5, I2, I3,..?


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