Temp guage inaccuracy???
#1
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Temp guage inaccuracy???
I have come across many sites that say that the coolant temp guage in the FD is not very good. When it reads the the car is overheating it is usualy to late. Im not quite shur what they mean by to late, i supose for coolant o ring problems.
But my question is, Is there an upgrade for the coolant temp switch that will go in the stock location and will hook up to the stock guage making it more accurate?
Just to eliminate the need to add another coolant tem guage.
Thanks
PS i have already done a search but did not find what i was looking for.
But my question is, Is there an upgrade for the coolant temp switch that will go in the stock location and will hook up to the stock guage making it more accurate?
Just to eliminate the need to add another coolant tem guage.
Thanks
PS i have already done a search but did not find what i was looking for.
#4
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http://www.iluvmyrx7.com/3rdgen/how-...auge%20mod.pdf
haven't tried it, but i plan to.
also, they mean to late as in it takes so long for the high temps to register with the temp gauge, that if you don't pull over instantly, or even if you do, serious damage probably has already occured...and yes, likely to your o rings
also, if u mean just putting a new guage in the stock location...
http://www.maxcooper.com/rx7/how-to/spa_gauges/
haven't tried it, but i plan to.
also, they mean to late as in it takes so long for the high temps to register with the temp gauge, that if you don't pull over instantly, or even if you do, serious damage probably has already occured...and yes, likely to your o rings
also, if u mean just putting a new guage in the stock location...
http://www.maxcooper.com/rx7/how-to/spa_gauges/
#6
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A sensor swap won't work unless you're also adding a different gauge. The problem is the stock gauge isn't linear...the "normal" reading on the gauge can mean any of a wide range of temperatures, many of which are bad.
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#8
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FYI,
the first 12 months I owned my car I had extensive cooling problems. Among others, the following things happen to cause me to "over heat" on more than one occasion.
1) upper rad hose exploded.
2) my drivers side radiator fan died 2 times (koyo core rubbed it)
3) my wiring for my fans cracked the rubber sheath causing the wire to touch the chassis making the fuse that runs the fans blow, so both fans stop.
4) the hose behind the manifold decided to crack.
5) my AST cracked the nipple off. I drove and over heated.
My water temps hit has high as 114-117C. FYI, the stock gauge doesn't start to move until about 115-116C.
When I cracked my apex seal some time later my mechanic took apart my engine to rebuild it. We found the O-Ring to be fine. The gauge on these occasions read just below the red line... It never made it in to the red, but got close.
I agree the stock gauge has issues and that when the gauge starts to move you have seconds to react, but I also believe that as long as the needle doesn't go into the red, your car will not be damaged.
I also beleive that while the car can operate fine even in temps of 114-116C, doing that on a regular basis will cause the O-ring and other engine componenets to become brittle OVER TIME.
Just my experience.
the first 12 months I owned my car I had extensive cooling problems. Among others, the following things happen to cause me to "over heat" on more than one occasion.
1) upper rad hose exploded.
2) my drivers side radiator fan died 2 times (koyo core rubbed it)
3) my wiring for my fans cracked the rubber sheath causing the wire to touch the chassis making the fuse that runs the fans blow, so both fans stop.
4) the hose behind the manifold decided to crack.
5) my AST cracked the nipple off. I drove and over heated.
My water temps hit has high as 114-117C. FYI, the stock gauge doesn't start to move until about 115-116C.
When I cracked my apex seal some time later my mechanic took apart my engine to rebuild it. We found the O-Ring to be fine. The gauge on these occasions read just below the red line... It never made it in to the red, but got close.
I agree the stock gauge has issues and that when the gauge starts to move you have seconds to react, but I also believe that as long as the needle doesn't go into the red, your car will not be damaged.
I also beleive that while the car can operate fine even in temps of 114-116C, doing that on a regular basis will cause the O-ring and other engine componenets to become brittle OVER TIME.
Just my experience.
#9
Ex fd *****
I decided to go down a similar path as Max Cooper, but using AutoMeter gauges
https://www.rx7club.com/photo/showphoto.php?photo=4400
more info in this thread:
https://www.rx7club.com/forum/showth...hreadid=199139
https://www.rx7club.com/photo/showphoto.php?photo=4400
more info in this thread:
https://www.rx7club.com/forum/showth...hreadid=199139
Last edited by maxpesce; 12-17-03 at 10:09 AM.
#10
Rotary Enthusiast
Re: Temp guage inaccuracy???
Originally posted by 89Turbo944
... But my question is, Is there an upgrade for the coolant temp switch that will go in the stock location and will hook up to the stock guage making it more accurate?
Just to eliminate the need to add another coolant tem guage.
... But my question is, Is there an upgrade for the coolant temp switch that will go in the stock location and will hook up to the stock guage making it more accurate?
Just to eliminate the need to add another coolant tem guage.
#11
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Re: Re: Temp guage inaccuracy???
Originally posted by KevinK2
I didn't want/need to do the linearization, so I just added a resistor in parallel to the gage sensor. My gage will now start rising when ecu 1st turns fans on, at 221F. Before it would not rise 'till about 240+F. Only drawback is it indicates 'normal' to soon aft start-up, so I just wait a bit before considering it warmed up.
I didn't want/need to do the linearization, so I just added a resistor in parallel to the gage sensor. My gage will now start rising when ecu 1st turns fans on, at 221F. Before it would not rise 'till about 240+F. Only drawback is it indicates 'normal' to soon aft start-up, so I just wait a bit before considering it warmed up.
#12
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Thanks for the useful info guys. I think i will go for the liniar conversion thingy. I would like to keep the guages as stock as possible.
This allows me to get a set of white aftermarket guage faces that fit properly.
Thanks again.
This allows me to get a set of white aftermarket guage faces that fit properly.
Thanks again.
#13
Rotary Enthusiast
Re: Re: Re: Temp guage inaccuracy???
Originally posted by novadan67
Kevin, can you give us more details? What size resistor? You say that it starts moving when the ECU turns on the fans, but how high does it rise before it goes back down to the normal range (when ecu turns off the fans).
Kevin, can you give us more details? What size resistor? You say that it starts moving when the ECU turns on the fans, but how high does it rise before it goes back down to the normal range (when ecu turns off the fans).
resistor is wired with combo male/female spade at sensor end for oem female to connect to. other end is grounded. i'll try to measure it tonite and post value.
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