FD Proportioning valve info
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FD Proportioning valve info
I'm interested in finding a chart similar to the following one for the miata http://www.flyinmiata.com/tech/stock_bpv.php listing how the proportioning valve in the FD modifies the line pressure.
I'm also wondering if there was a different proportioning valve for the 99+ cars. I know they changed the size of the vacuum assist unit (I believe giving less assistance than previous models). Did the master cylinder size stay the same throughout all years of the FD?
As you can see looking at the link for the miata, mazda started off really conservative with the rear brakes, and throughout the years made the car more and more fun (bean counters at mazda would probably say more dangerous lol). I'm wondering if mazda did that with the FD as well. Like the FD, the miata had a "sport" brake package available which increased the rotor size by pushing the calipers further out... just like 99 brakes . Cheap and effective. Mazda also did some other interesting stuff for 99 like decreasing brake vacuum assist, decreasing power steering pressure, etc. I'd love to make a definitive list of all the "tweaks" cause we've kinda been living in the stone age with the 93 parts... that was just the first stab at the FD and it got progressively better over the years
-Heath
Miata Proportioning Valve Chart:
I'm also wondering if there was a different proportioning valve for the 99+ cars. I know they changed the size of the vacuum assist unit (I believe giving less assistance than previous models). Did the master cylinder size stay the same throughout all years of the FD?
As you can see looking at the link for the miata, mazda started off really conservative with the rear brakes, and throughout the years made the car more and more fun (bean counters at mazda would probably say more dangerous lol). I'm wondering if mazda did that with the FD as well. Like the FD, the miata had a "sport" brake package available which increased the rotor size by pushing the calipers further out... just like 99 brakes . Cheap and effective. Mazda also did some other interesting stuff for 99 like decreasing brake vacuum assist, decreasing power steering pressure, etc. I'd love to make a definitive list of all the "tweaks" cause we've kinda been living in the stone age with the 93 parts... that was just the first stab at the FD and it got progressively better over the years
-Heath
Miata Proportioning Valve Chart:
#2
RX-7 Bad Ass
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Never seen that info for the FD. You'd probably have to manually put something like that together with a brake pressure gauge or something.
This also seems to be something for a brake engineer, that sort of stuff gets over my pay grade .
Dale
This also seems to be something for a brake engineer, that sort of stuff gets over my pay grade .
Dale
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-Heath
#4
Golf Cart Hooligan
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Here you go:
Brake Pressure Gauge
Now get to work!
...I will be expecting colorful graphs / charts
edit: ^ FYI the gauge goes in place of the bleeder valve
Brake Pressure Gauge
Now get to work!
...I will be expecting colorful graphs / charts
edit: ^ FYI the gauge goes in place of the bleeder valve
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Here you go:
Brake Pressure Gauge
Now get to work!
...I will be expecting colorful graphs / charts
edit: ^ FYI the gauge goes in place of the bleeder valve
Brake Pressure Gauge
Now get to work!
...I will be expecting colorful graphs / charts
edit: ^ FYI the gauge goes in place of the bleeder valve
#6
Rotary Freak
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Believe our FSM has a plot of what we got originally. Later manuals form Japan should show nay differences. Not eth 2002/06 ABS is a straight line, this would be due to EBD electronic distribution in the newer ABS units. The S8's had EBD so if they used straight line proportioning, it would be dangerous without the control circuits
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Interesting post,
Some time ago, had been doing some research and found one blog where 94-96 model proportioning valve has been changed to miata NB model.
http://www.kameson.com/RX-7/P-VAL.htm
You'd find some visual comparrison of proportioning valves.
It would be interesting to get more information about brake biasing differences made between the years of production.
Some time ago, had been doing some research and found one blog where 94-96 model proportioning valve has been changed to miata NB model.
http://www.kameson.com/RX-7/P-VAL.htm
You'd find some visual comparrison of proportioning valves.
It would be interesting to get more information about brake biasing differences made between the years of production.
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Believe our FSM has a plot of what we got originally. Later manuals form Japan should show nay differences. Not eth 2002/06 ABS is a straight line, this would be due to EBD electronic distribution in the newer ABS units. The S8's had EBD so if they used straight line proportioning, it would be dangerous without the control circuits
#9
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01-02 FD3S abs unit actually did have proportioning valve on the side, but prop valve itself just might be straight through.
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i'm also of the understanding that the later FD's got a restrictor in the PS pressure hose, and thus had less assist.
i didn't check, but i bet the part has superseded and if you try to order a 93 spec part you'd get the later one.
i'm not sure when they switched, the 99MY seems like a good choice though
i didn't check, but i bet the part has superseded and if you try to order a 93 spec part you'd get the later one.
i'm not sure when they switched, the 99MY seems like a good choice though
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i'm also of the understanding that the later FD's got a restrictor in the PS pressure hose, and thus had less assist.
i didn't check, but i bet the part has superseded and if you try to order a 93 spec part you'd get the later one.
i'm not sure when they switched, the 99MY seems like a good choice though
i didn't check, but i bet the part has superseded and if you try to order a 93 spec part you'd get the later one.
i'm not sure when they switched, the 99MY seems like a good choice though
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