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Thread: What should my coolant temp be?

  1. #1
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    Default What should my coolant temp be?

    I have an 88 mk3 7mgte. I have after market gauges. Just wondering what the official on what my coolant temp should be for street and what it should b for the track (road racing) Thank you.

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    Default Re: What should my coolant temp be?

    mine bounces from 160-180 on the street. it will go to 180, then drop to 160, go back to 180 etc. am running a 180 themostat
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    Default Re: What should my coolant temp be?

    200-210.
    Have you loosened Orion's belt yet? The opposite of right is both left and wrong.

    http://www.thereligionofpeace.com/

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    Default Re: What should my coolant temp be?

    Quote Originally Posted by Nick M View Post
    200-210.
    Would 225 be overheating? I have no clue. lol


    1987 Supra 7MGTE, 2.5 Intake piping, Latest DM intercooler, DDP, DM exhaust, Koyorad, Apexi Power Intake, Aeromotive AFPR, Walbro 255, 680cc Low Impedance Injectors, ES Bushings, Eagle Rods, AEM Wideband, ARP Hardware. PROEFI 128 or AEM EMS? JE OR Wiseco Pistons?
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    Default Re: What should my coolant temp be?

    225*F is warmer than I would run the car, but on the stock gauge still shows in the "acceptable" range. So basically, Toyota thought it was ok, but they also thought the head gasket torque was good too . You have to remember that 212*F is boiling for water, so if you're going that warm you're adding more pressure to the system. All it takes is one pin hole leak for a hose to explode at that point.

    ECU happy range is 180 - 210. Under 180 it goes in to a rich warmup mode and above 210 it tries to do things to prevent the engine from getting warmer. 210*F is when the extra electric fan(s) beside the mechanical clutch fan will engage. A stock system with the stock thermostat (190*F) on a relatively stock motor should keep it between 180 and 195 for most regular driving. If I'm driving on a warmer day and pushing the car a bit, I might see 200 or 205, but not really any higher. If you let the car sit after being warm for 5 - 10 minutes, you'll get some heat soak that will show higher on startup but it should drop down within 10 seconds of starting the car.

    My car has an upgraded 57-trim CT26 @ ~10psi, 3" turbo back cat delete exhaust, 2.5" IC hard pipes, and I'll stay within those numbers.
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    Default Re: What should my coolant temp be?

    212 will only boil water at sea level pressure of one BAR. Toyota puts a pressure cap on at .9 BAR, raising the boiling point so the coolant can absorb more heat. I changed my 13 psi cap for a 16. And have a huge fan clutch on it. I have my high pressure A/C switch disabled and a toggle plugged in. I can turn on my A/C and not the electric fans and the guage won't budge, even in our ridiculous heat this summer.

    edit: your car will run just fine at 190.

    edit: face palm...
    Last edited by Nick M; July 28th, 2011 at 03:43 PM.
    Have you loosened Orion's belt yet? The opposite of right is both left and wrong.

    http://www.thereligionofpeace.com/

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    Default Re: What should my coolant temp be?

    .9 bar

    1 bar = 1 atm

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    Default Re: What should my coolant temp be?

    Just goes to show what thinking about boost does to the brain....
    Have you loosened Orion's belt yet? The opposite of right is both left and wrong.

    http://www.thereligionofpeace.com/

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    Default Re: What should my coolant temp be?

    Quote Originally Posted by jetjock View Post
    .9 bar

    1 bar = 1 atm
    that's 0.9bar ABOVE atm

  10. #10
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    Default Re: What should my coolant temp be?

    mine sits at 190 in 95 degree heat driving 70mph to work
    it rises up to 210 when i run it hard

    i have aluminum radiator, a/c condensor removed, 190 degree tstat, stock fan with no fan shroud, no small electric fans either


    QUESTION: When does the 7mgte require a MHG?

    ANSWER: When being assembled in the Toyota plant!!!

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