1989 mr2 thermostat........

[newelly]

4age,will it overheat without using a thermostat?

[mr3]

Shouldnt, when mine went out it was stuck open and it wouldnt heat up.

[newelly]

Originally Posted by newelly

4age,will it overheat without using a thermostat?

threw a belt......must be the reason for over heating and dead battery,,, thanks

[mr3]

Um, now that you say that, you most deffinatly will overheat! My belt snapped on me in 30 degree weather and I overheated in a few seconds. It's not a smart thing to do to drive witout the alternator and water pump running. The pump keeps the coolent cycling through the system and it does stay pretty cool. Without that, YOU WILL OVERHEAT.

[toyotaspeed90]

the alt and WP belt are the same belt on the 4age's......

you shouldn't run w/o a thermostat as the temp will be too low and you'll get poor performance and mileage.

[newelly]

Originally Posted by toyotaspeed90

the alt and WP belt are the same belt on the 4age's......

you shouldn't run w/o a thermostat as the temp will be too low and you'll get poor performance and mileage.

i was having the o.h. problem so thats why i took it out.i have always ran with one. i have a nose cone on the car that maybe was not allowing enough air flow.there is no front air dam. i took off the bumper cover and drilled holes 4 air to pass through over and under the bumper. raced last night and won a heat race of 10 laps with no overheating. now before the car never overheated with the bumper cover and nose cone on. how much performance you think u would lose running w/o thermostat?? car never leaves 2nd gear,starts smackin the rev limiter right at the end of the straight.perfect for 3/8 mile track

[mr2tim]

Like Toyotaspeed indicated if your heat gauge isn't straight up the ECU isn't reading the correct sensor inputs for optimum horsepower.

You will NEVER generate enough heat in the pits at idle (or other) fast enough to just go right out on the track without a thermo. (BTDT)

BTW did you know the E-51 "Supercharged" self-oiling transmission which fits your 4a series engine is a factory close-ratio unit, like
how about 3rd gear at the end of the straight?

Just a "passing" thought.

Supercharzed Toyz Raczing
S.E. Division, SCCA Racing
South Florida Sports Car Club

[toyotaspeed90]

sounds like it's a racecar.....

I wouldn't recommend doing this for a daily driver.... but what you may want to think about doing is....

run without a thermostat.... this will only bring the temp up to probably around 150-160 (guessing here)..... however, install a potentiometer onto the ecu's coolant temp sensor.... performance will be affected when the coolant sensor reads a low coolant temp and it will add extra fuel.... in an n/a engine, this isn't what you want. You could probably even lean it out a bit and gain even more performance....

[toyotaspeed90]

Originally Posted by mr2tim

Like Toyotaspeed indicated if your heat gauge isn't straight up the ECU isn't reading the correct sensor inputs for optimum horsepower.

You will NEVER generate enough heat in the pits at idle (or other) fast enough to just go right out on the track without a thermo. (BTDT)

BTW did you know the E-51 "Supercharged" self-oiling transmission which fits your 4a series engine is a factory close-ratio unit, like
how about 3rd gear at the end of the straight?

Just a "passing" thought.

Supercharzed Toyz Raczing
S.E. Division, SCCA Racing
South Florida Sports Car Club

the e51 is considerably heavier than a C series.... also harder to find parts for if something were to go out. Best thing I ever did on my 87 s/c was remove the E51. Car is MUCH faster and handles MUCH better.

stick with the C series... cheap and they get the job done.