cooling idea modification!
RX007, the reason the car gets so hot in traffic is because there isn't any air flowing through the radiator while you're sitting still. The factory ECU is designed with emissions in mind, and it waits until the car gets pretty hot to turn the fans on. The reason behind this is that a hotter engine will be cleaner for smog purposes.
If you want your car to run cooler, you can change the temperature at which the fans turn on, or add a manual fan switch. Check the FAQ at https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/ , there is a link called "Fan Mod" or something like that.
Another thing that is good to do is make sure you've got fresh coolant, with the proper ratio of water-to-coolant. The owner's manual for your car will say what percentage water to use, depending on the climate you live in.
-s-
If you want your car to run cooler, you can change the temperature at which the fans turn on, or add a manual fan switch. Check the FAQ at https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/ , there is a link called "Fan Mod" or something like that.
Another thing that is good to do is make sure you've got fresh coolant, with the proper ratio of water-to-coolant. The owner's manual for your car will say what percentage water to use, depending on the climate you live in.
-s-
Just to piggyback on what Scott's saying, you can buy the FC (2nd gen RX-7) thermoswitch, which is plug and play, and use it to replace the stock FD thermoswitch. This enables the fans to automatically kick in at a lower temp.
Specifically, the FD thermoswitch causes the fans to turn on on to LOW speed at 105C (221F). The fans go to MED at 108C (226F). The fans will only go to HIGH if temps are above 108C with the A/C on. With the FC thermoswitch, the fans come on at 95C. Fans come on sooner = car stays cooler = engine stays happier.
~Ramy
Specifically, the FD thermoswitch causes the fans to turn on on to LOW speed at 105C (221F). The fans go to MED at 108C (226F). The fans will only go to HIGH if temps are above 108C with the A/C on. With the FC thermoswitch, the fans come on at 95C. Fans come on sooner = car stays cooler = engine stays happier.
~Ramy
Senior Member
Joined: Apr 2005
Posts: 311
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From: Clearwater, florida
Originally Posted by FDNewbie
Correct, Nitrous Oxide, N20, is NOT flammable by itself. But at high temperatures (in excess of 500 degrees F), it breaks down into it's two components: N2 and O2, adding a greater concentration of oxygen than is present in normal air.
In the event of an accident with a fire, if the temperature becomes high enough to split the N2O, it would add more oxygen and thus accelerate the fire. That's why N2O is often regarded as an accelerant at higher temps.
Secondly, nitrous tanks are commonly kept at around 900-950 PSI (requiring a temperature of 88-100 degrees F or so, so they're pretty warm to begin with) for races, and sometimes up to 1000 PSI. A 33.5 pound tank rupturing can create enough force to cause heavy damage to a car and anything near it. And even if the nitrous doesn't catch fire and explode, the concussion from the tank rupturing would be enourmous. Just take a look at this guy's car after he forgot his nitrous tank heaters on, and the tank exploded...
In the event of an accident with a fire, if the temperature becomes high enough to split the N2O, it would add more oxygen and thus accelerate the fire. That's why N2O is often regarded as an accelerant at higher temps.
Secondly, nitrous tanks are commonly kept at around 900-950 PSI (requiring a temperature of 88-100 degrees F or so, so they're pretty warm to begin with) for races, and sometimes up to 1000 PSI. A 33.5 pound tank rupturing can create enough force to cause heavy damage to a car and anything near it. And even if the nitrous doesn't catch fire and explode, the concussion from the tank rupturing would be enourmous. Just take a look at this guy's car after he forgot his nitrous tank heaters on, and the tank exploded...
ohh shiat, that's a crappy way to kill a car.
Senior Member
Joined: Jul 2005
Posts: 364
Likes: 0
From: Clearwater, FL
FMIC=overheating false
On a hot day in traffic my stock setup ran hotter 106-108C in traffic in Florida.
The current setup FMIC with a fluildyene is about 104-106C in traffic with no belly tray w/ single stock oil cooler.
On the highway neither presented a problem. I'm pretty sure that the scoot style hood will drop those temps by another 2-4C.
On a hot day in traffic my stock setup ran hotter 106-108C in traffic in Florida.
The current setup FMIC with a fluildyene is about 104-106C in traffic with no belly tray w/ single stock oil cooler.
On the highway neither presented a problem. I'm pretty sure that the scoot style hood will drop those temps by another 2-4C.
Joined: Mar 2004
Posts: 1,670
Likes: 0
From: King George, VA USA
Originally Posted by jupiter
frontmount---bad for traffic. your car will overheat period. I turn on my AC and pop the hood for last resort. Also use that waterless coolant (helps alot)
Front-mount + traffic = no air to the intercooler..but there's less clutter in the engine bay itself to collect heat
Stock-mounted IC + traffic = more heat in the engine bay = heated intercooler and piping = even MORE ineffective.
Thermostat-engaged electric radiator fans are your friend. Meaning, they turn on at a certain temp, and turn off at a certain temp. Whether the car is on or off. Best idea ever.
Oh, and lol @ the A/C button thing...me too, man. Me too. 188C in traffic isn't too bad with stock IC and radiator, I guess. :o|
Full Member
Joined: Apr 2001
Posts: 195
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From: san diego
I have the fan mod also. I can turn on fan on/off at max speed whenever I want.
But this will not help with FMIC and bad traffic. I even have hood vents. So I've stop using the FD as daily driver for now until I get a V mount. Good luck with your findings.
But this will not help with FMIC and bad traffic. I even have hood vents. So I've stop using the FD as daily driver for now until I get a V mount. Good luck with your findings.
You have fighting spirit.
Joined: Oct 2004
Posts: 317
Likes: 0
From: NW
Originally Posted by RX7UP
What kind of car was that all blown up?...
And whadda ya know, the page is still up.
http://www.enhancedhealth.com/nitrousexpress.htm
Last edited by Red Suns; Mar 13, 2006 at 01:50 AM.
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