R-Magic dashboard instrumentation...similar to Defi BF gauges
Originally posted by clayne
But guys, isn't the BF look just white backlighting?
It would be the same as stock but stock uses a less bright light and a tinted orange gauge cover.
But guys, isn't the BF look just white backlighting?
It would be the same as stock but stock uses a less bright light and a tinted orange gauge cover.
Super Snuggles
Joined: Feb 2001
Posts: 10,091
Likes: 34
From: Redmond, WA
Unless I'm mistaken, there was no difference in the transmission or VSS (vehicle speed sensor) used in the manual FDs, no matter where they were destined for, at least for 1993-1995.
The VSS sends out 8 AC pulses per driven gear rotation, according to my "service highlights" manual, and the analog speedometer is driven by a comparator circuit. The comparator receives the pulses which turn it on and off, and the computing element determines the amount of current to send to the cross coils based on the count. The current in the coils creates a magnetic field, moving the needle on the analog speedometer, indicating speed.
The U.S. speedometers are calibrated to ~8,200 pulses per minute @ 60 mph, and I suspect the Japanese (and Canadian, UK, and Aus) speedometers are also, or the equivalent in kph (96 kph), at any rate. Since the calibration shown for 100 kph (Canadian speedometers) is listed as ~8,490 pulses per minute, which is equivalent to ~62.5 mph/~8,500 ppm, that's the same as 60 mph/~8,200 ppm, which would indicate a standard VSS output for all cars. At least, that's what I'm guessing, since there's no difference between domestic and export models for any of the other sensors on the car.
A replacement speedometer with a higher (or lower) maximum range (180 kph or 300 kph, for example) would simply have its own comparator circuit adjusted to indicate the correct position for 100 kph/8,490 ppm, regardless of the maximum indicated speed.
In the case of my speedometer, 60 mph on a 240 mph speedometer required modification of the comparator circuit, and I also had the calibration rounded to 8,000 ppm @ 60 mph, for easier conversion from a different manufacturer's VSS output (GM T56 6-speed). I sent my speedometer to New Zealand to be redone, and they obviously have speedometers calibrated in kph, but there was no difference in the two that I was told about. The comparator circuit operates the same way and is modified in the same way. They could have done my speedometer in kph only instead and calibrated it to whatever I wanted, in other words.
It would be my assumption, since the comparator circuit is part of the speedometer/odemeter assembly, that if you switched a Japanese speedometer into a U.S. car and a U.S. speedometer into a Japanese car, that if the wiring were the same (at least for '93-'95, I suspect it is) then the Japanese car would still read the correct speed -- but in mph -- and the U.S. car would still read the correct speed, but in kph. Since the comparator circuit is what drives the speedometer needle, and the input calibration is (or should be) the same, only the current generated in the coil is different based on the calibration and/or market. Make sense?
The VSS sends out 8 AC pulses per driven gear rotation, according to my "service highlights" manual, and the analog speedometer is driven by a comparator circuit. The comparator receives the pulses which turn it on and off, and the computing element determines the amount of current to send to the cross coils based on the count. The current in the coils creates a magnetic field, moving the needle on the analog speedometer, indicating speed.
The U.S. speedometers are calibrated to ~8,200 pulses per minute @ 60 mph, and I suspect the Japanese (and Canadian, UK, and Aus) speedometers are also, or the equivalent in kph (96 kph), at any rate. Since the calibration shown for 100 kph (Canadian speedometers) is listed as ~8,490 pulses per minute, which is equivalent to ~62.5 mph/~8,500 ppm, that's the same as 60 mph/~8,200 ppm, which would indicate a standard VSS output for all cars. At least, that's what I'm guessing, since there's no difference between domestic and export models for any of the other sensors on the car.
A replacement speedometer with a higher (or lower) maximum range (180 kph or 300 kph, for example) would simply have its own comparator circuit adjusted to indicate the correct position for 100 kph/8,490 ppm, regardless of the maximum indicated speed.
In the case of my speedometer, 60 mph on a 240 mph speedometer required modification of the comparator circuit, and I also had the calibration rounded to 8,000 ppm @ 60 mph, for easier conversion from a different manufacturer's VSS output (GM T56 6-speed). I sent my speedometer to New Zealand to be redone, and they obviously have speedometers calibrated in kph, but there was no difference in the two that I was told about. The comparator circuit operates the same way and is modified in the same way. They could have done my speedometer in kph only instead and calibrated it to whatever I wanted, in other words.
It would be my assumption, since the comparator circuit is part of the speedometer/odemeter assembly, that if you switched a Japanese speedometer into a U.S. car and a U.S. speedometer into a Japanese car, that if the wiring were the same (at least for '93-'95, I suspect it is) then the Japanese car would still read the correct speed -- but in mph -- and the U.S. car would still read the correct speed, but in kph. Since the comparator circuit is what drives the speedometer needle, and the input calibration is (or should be) the same, only the current generated in the coil is different based on the calibration and/or market. Make sense?
Last edited by jimlab; Jan 25, 2004 at 11:55 AM.
Super Snuggles
Joined: Feb 2001
Posts: 10,091
Likes: 34
From: Redmond, WA
Originally posted by teamstealth
jimlab, if the above is true...couldnt you get a 99spec gauge cluster, swap in the US comparator circuit, and eliminate that 180kph speedo problem that everyone bitches about?
jimlab, if the above is true...couldnt you get a 99spec gauge cluster, swap in the US comparator circuit, and eliminate that 180kph speedo problem that everyone bitches about?
What exactly are people complaining of? They swapped in a speedometer calibrated in kph, and they want it to automatically read correctly in mph?
Super Snuggles
Joined: Feb 2001
Posts: 10,091
Likes: 34
From: Redmond, WA
Originally posted by Fujikuro
I'd but them...look really good. And the metric thing isn't a problem since my car has metric gauges anyway (car is originally from canada...)
I'd but them...look really good. And the metric thing isn't a problem since my car has metric gauges anyway (car is originally from canada...)
A speedometer labeled in kph only, on the other hand, would throw some people off (like a boost gauge calibrated in Bar or kg/cm^2 only) because it would require them to learn the conversion to mph in order to comply with U.S. speed limits...
yah thats true it does have the mph, but after driving the car for so long i dont even really pay attention to the mph, mainly because the numbers are so damn small...
i just see a 25m sign an think 40km, or a 50m sign and think 80km
i just see a 25m sign an think 40km, or a 50m sign and think 80km
Originally posted by jimlab
The Canadian speedometers probably have an inner ring labeled in mph (the opposite of U.S. speedometers), making them usable in both countries. Makes sense, since we share a border.
A speedometer labeled in kph only, on the other hand, would throw some people off (like a boost gauge calibrated in Bar or kg/cm^2 only) because it would require them to learn the conversion to mph in order to comply with U.S. speed limits...
The Canadian speedometers probably have an inner ring labeled in mph (the opposite of U.S. speedometers), making them usable in both countries. Makes sense, since we share a border.
A speedometer labeled in kph only, on the other hand, would throw some people off (like a boost gauge calibrated in Bar or kg/cm^2 only) because it would require them to learn the conversion to mph in order to comply with U.S. speed limits...
Also, thanks for that info.. now all make sense..
Super Snuggles
Joined: Feb 2001
Posts: 10,091
Likes: 34
From: Redmond, WA
Originally posted by herblenny
What is 6k on 5th gear??
I hit that couple of months ago.. but my gauge only goes upto 180KPH.
I was running away from State trooper..
What is 6k on 5th gear??
I hit that couple of months ago.. but my gauge only goes upto 180KPH.
I was running away from State trooper..
1JZ powered
Joined: Jul 2001
Posts: 4,423
Likes: 0
From: Where there's only two seasons, hot and wet! I love Okinawa
Originally posted by jimlab
Unless I'm mistaken, there was no difference in the transmission or VSS (vehicle speed sensor) used in the manual FDs, no matter where they were destined for, at least for 1993-1995.
The VSS sends out 8 AC pulses per driven gear rotation, according to my "service highlights" manual, and the analog speedometer is driven by a comparator circuit. The comparator receives the pulses which turn it on and off, and the computing element determines the amount of current to send to the cross coils based on the count. The current in the coils creates a magnetic field, moving the needle on the analog speedometer, indicating speed.
The U.S. speedometers are calibrated to ~8,200 pulses per minute @ 60 mph, and I suspect the Japanese (and Canadian, UK, and Aus) speedometers are also, or the equivalent in kph (96 kph), at any rate. Since the calibration shown for 100 kph (Canadian speedometers) is listed as ~8,490 pulses per minute, which is equivalent to ~62.5 mph/~8,500 ppm, that's the same as 60 mph/~8,200 ppm, which would indicate a standard VSS output for all cars. At least, that's what I'm guessing, since there's no difference between domestic and export models for any of the other sensors on the car.
A replacement speedometer with a higher (or lower) maximum range (180 kph or 300 kph, for example) would simply have its own comparator circuit adjusted to indicate the correct position for 100 kph/8,490 ppm, regardless of the maximum indicated speed.
In the case of my speedometer, 60 mph on a 240 mph speedometer required modification of the comparator circuit, and I also had the calibration rounded to 8,000 ppm @ 60 mph, for easier conversion from a different manufacturer's VSS output (GM T56 6-speed). I sent my speedometer to New Zealand to be redone, and they obviously have speedometers calibrated in kph, but there was no difference in the two that I was told about. The comparator circuit operates the same way and is modified in the same way. They could have done my speedometer in kph only instead and calibrated it to whatever I wanted, in other words.
It would be my assumption, since the comparator circuit is part of the speedometer/odemeter assembly, that if you switched a Japanese speedometer into a U.S. car and a U.S. speedometer into a Japanese car, that if the wiring were the same (at least for '93-'95, I suspect it is) then the Japanese car would still read the correct speed -- but in mph -- and the U.S. car would still read the correct speed, but in kph. Since the comparator circuit is what drives the speedometer needle, and the input calibration is (or should be) the same, only the current generated in the coil is different based on the calibration and/or market. Make sense?
Unless I'm mistaken, there was no difference in the transmission or VSS (vehicle speed sensor) used in the manual FDs, no matter where they were destined for, at least for 1993-1995.
The VSS sends out 8 AC pulses per driven gear rotation, according to my "service highlights" manual, and the analog speedometer is driven by a comparator circuit. The comparator receives the pulses which turn it on and off, and the computing element determines the amount of current to send to the cross coils based on the count. The current in the coils creates a magnetic field, moving the needle on the analog speedometer, indicating speed.
The U.S. speedometers are calibrated to ~8,200 pulses per minute @ 60 mph, and I suspect the Japanese (and Canadian, UK, and Aus) speedometers are also, or the equivalent in kph (96 kph), at any rate. Since the calibration shown for 100 kph (Canadian speedometers) is listed as ~8,490 pulses per minute, which is equivalent to ~62.5 mph/~8,500 ppm, that's the same as 60 mph/~8,200 ppm, which would indicate a standard VSS output for all cars. At least, that's what I'm guessing, since there's no difference between domestic and export models for any of the other sensors on the car.
A replacement speedometer with a higher (or lower) maximum range (180 kph or 300 kph, for example) would simply have its own comparator circuit adjusted to indicate the correct position for 100 kph/8,490 ppm, regardless of the maximum indicated speed.
In the case of my speedometer, 60 mph on a 240 mph speedometer required modification of the comparator circuit, and I also had the calibration rounded to 8,000 ppm @ 60 mph, for easier conversion from a different manufacturer's VSS output (GM T56 6-speed). I sent my speedometer to New Zealand to be redone, and they obviously have speedometers calibrated in kph, but there was no difference in the two that I was told about. The comparator circuit operates the same way and is modified in the same way. They could have done my speedometer in kph only instead and calibrated it to whatever I wanted, in other words.
It would be my assumption, since the comparator circuit is part of the speedometer/odemeter assembly, that if you switched a Japanese speedometer into a U.S. car and a U.S. speedometer into a Japanese car, that if the wiring were the same (at least for '93-'95, I suspect it is) then the Japanese car would still read the correct speed -- but in mph -- and the U.S. car would still read the correct speed, but in kph. Since the comparator circuit is what drives the speedometer needle, and the input calibration is (or should be) the same, only the current generated in the coil is different based on the calibration and/or market. Make sense?
if it does..... 
thats not paint....
Joined: May 2001
Posts: 2,231
Likes: 2
From: Manassas, VA
If we get 10 or more people we can have something that looks just like this cluster for 100$ here is the thread
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/quality-reverse-glow-gauges-no-rice-here-331320/
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/quality-reverse-glow-gauges-no-rice-here-331320/
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