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Old 06/24/2005, 04:13 PM   #1 (permalink)
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Any way to make the car run cooler?

I been driving my moms Infiniti FX for the past week, and i've noticed that the temp gauge, after hours of driving, will not be near the middle of the gauge, yet, with my car, after hours of driving, the damn thing fluctuates from just above the middle, to a little below the middle. I've also noticed, that when my car is still warming up in the morning as I drive it to work, it shifts a lot smoother (the warmer it gets, the harder it shifts), and until it warms up, seems like it a lot less hesitant to get moving when I hit the gas. SO, my question is, how can I make my car run a lot cooler than it does?


After hours of driving, my needle in my car would probably be resting RIGHT above the top of the temperature sign.
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Old 06/24/2005, 04:26 PM   #2 (permalink)
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maybe the gauges are set up differently. the cars could be running at the same temp. for example maybe the infinity gauge registers from 0-400 and your car gauge is for 0-300. if both cars were running at 200 your gauge would be just over half and in infinite gauge would be right at half.
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Old 06/24/2005, 04:45 PM   #3 (permalink)
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you could get a better radiator, but thats really about it.
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Old 06/24/2005, 05:06 PM   #4 (permalink)
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switch out the thermostat. But really, Wingman is correct. It is just how the needle is sitting. If your car is shifting harder after it warms up, I would first check the fluid level, if everything is ok, change the fluid. Last case scenario, a trans cooler. A trans cooler is usually used for vehicles which will be towing something though.
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Old 06/24/2005, 05:15 PM   #5 (permalink)
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Why is it that it has the H on top followed by a a little line marking it, then another line 4/5 of the way up and then another line marked with the C.

H=Hot, C=Cold obviously, so why is there another line so high up there?
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Old 06/24/2005, 05:55 PM   #6 (permalink)
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Quote:
Originally Posted by andrewken
Why is it that it has the H on top followed by a a little line marking it, then another line 4/5 of the way up and then another line marked with the C.

H=Hot, C=Cold obviously, so why is there another line so high up there?
Dunno....I guess the mark under the H means to pull that ass over before some real bad shit occurs.
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Old 06/24/2005, 06:16 PM   #7 (permalink)
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Quote:
Originally Posted by Nokio
Dunno....I guess the mark under the H means to pull that ass over before some real bad shit occurs.
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Old 06/24/2005, 07:58 PM   #8 (permalink)
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exactly...

normal operating temp for most all engines is 190-200.... although there are cars that have 180 and some that run at 210...




stock gauges are far from accurate. i have seen cars with coolant temp of 230 and the stock gauge was in the same spot.

that little line is the warning... it means exactly what he said above. Pull the fuck over and call the tow truck

but to answer the underlying question.. yes get a different thermostat. I have seen as low as 170 for these cars.

but in all reality.. colder air means more power.. but colder coolant does not necessarily mean more power. Heat helps the combustion process. It is more efficient to be around stock operating temp. Less fuel will be used to make the same amount of power.

anything below 160ish you will get a code for not reaching operating temps and your car will run open loop (preset(very bad))
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Old 06/24/2005, 08:04 PM   #9 (permalink)
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So, different thermostats will allow the car to run at different temps?

Like, I can go buy one, that will make my car run cooler than the stock thermostat does? Or is that all controlled be the ECU?
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Old 06/24/2005, 08:22 PM   #10 (permalink)
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Quote:
Originally Posted by Nokio
So, different thermostats will allow the car to run at different temps?

Like, I can go buy one, that will make my car run cooler than the stock thermostat does? Or is that all controlled be the ECU?
Yes, you can buy a new thermostat to run yuor engine at a cooler temp. But why would you? There is absolutely no performance benefit of it. In fact, just as Burn has said, too much cooling is bad for your car too, and performance.
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Old 06/24/2005, 08:24 PM   #11 (permalink)
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all the thermostat does is hold the coolant from fully circulating through the radiator until it reachs a certain temp. It will open when it reaches 190 and will close if it goes below. Basically keeping it in operating temp. If its very cold outside(winter) the t stat might stay closed to allow the engine to stay at oper temp and only open once in a while to circulate the coolant only to close and let it warm up again.
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Old 06/24/2005, 08:26 PM   #12 (permalink)
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alot of people will go to a 180... but i dont really recommend going lower than that.

if you have an engine that has issues with heat. Some engines are prone to it. They will use 170's as a safety precaution. But they are tuning the car as that being the operating temp. The car will use more fuel.. to combust the same at 170 as opposed to 190. maybe you will get 1hp.. which is like .7whp... lol
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Old 06/25/2005, 02:32 AM   #13 (permalink)
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I really just want to get rid of that hard shifting once the car warms up. When its cold (still warming up as 'm driving), the shifts kinda blend into each other, especially from 1-2. The RPM's will, when shifting from 1 to 2, smoothly/gradually drop from the 3500 shifting point (on my car, anyway) down into the next gear. However, when the car has warmed up, the RPM's kind of just "drop" down into the next gear. It gets smoother as I run through the gears, but the upshift from 1 to 2 makes it really noticible, because it drops into that dead spot in 2nd and the car sort of feels like it struggling for a few seconds.
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Old 06/25/2005, 07:10 AM   #14 (permalink)
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check the trans fluid level or maybe try a synthetic fluid. i noticed that my trans shifts smooth as glass at 114K miles when i put in sythetic fluid. it shifts smoother than cars with less miles even. as for how yours is shifting....could it be that when the engine is cold the auto trans "granny shifts" to keep the rpms low to reduce fuel consumption on a cold engine. if its shifting low in the gears its gonna feel smoother. the dead spot....when you peg the gas at about 35-40, the rpms climb slowly as the car slowly accels up?
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Old 06/25/2005, 09:12 AM   #15 (permalink)
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Definitly change your trans fluid... when the fluid breaks down from getting so hot constantly. The fluid will be less effective.
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