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Location:
Perth
Registered:
July 2003
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1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 05:25
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Anyone know what the stock thermostat (90916-03093) opens at?
The local Toyota mob reckon 82 - 95 degrees - that seems too wide a range to me.
The TRD website (http://toyota-trd.jp/en/strt/thrmstut.html) sells 'sports' ones that open at 71 degrees - that seems too low.
Thanks
Peter
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Location:
Brisbane
Registered:
June 2003
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 05:29
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around 82-85" would be right. i dunno what toyota spec as the opening temp, but 82 is what my 7m opens at, doubt the 1jz would be "much" more than that.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 05:43
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I tested mine out on the weekend while swapping engines just to make sure it was working. Unfortunately no thermometer available 
slightly OT: how does the thermostat know what temprature it is?
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Location:
Brisbane
Registered:
June 2003
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 05:50
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little sensor inside the spring  the piece just looks like your typical toyota temp sensor really!
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Location:
Brisbane
Registered:
May 2002
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 06:55
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Bi-metal strip actually. Two different types of metal with different thermal expansion properties are bonded together; as they heat up, one expands more than the other, so the strip bends. This is what opens the thermostat valve.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 07:13
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bloody good idea that!
thanks guys
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Location:
Perth
Registered:
October 2003
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 08:13
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Theres a bit of debate out there on this one. My 1JZ sits on 90-92 degrees, so it may begin opening a little before this.
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Location:
Canberra
Registered:
May 2002
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 08:40
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My VVTi 1JZ-GTE uses an 82 Deg C thermostat. My in radiator thermo switch turns the fans on at 85 Deg, and shuts em down at 82 Deg.
regards Chuck.
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Location:
Perth
Registered:
July 2003
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Re: 1JZ Thermostat Opening Temperature?
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Tue, 24 August 2004 13:00
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Ok - looks like the consensus is at least 82 degrees.
Now I realise why my bottom radiator hose was stone cold after a 10 minute warm-up. The engine was only up to about 75 degrees and hence the thermostat was still shut. Looks like I'll have to wait a little longer.
Thanks
Peter
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