Trackspeed Engineering Proportioning Valve Kit
1 Attachment(s)
https://www.miataturbo.net/attachmen...ine=1329196840 Trackspeed Engineering's Adjustable Proportioning Valve Kit is a must-have item for anyone looking to shorten stopping distances and maximize braking potential. It replaces the factory proportioning valve with an adjustable unit, which allows you to dial in the brake bias to suit your conditions and uses. The kit also includes two steel adapter fittings, eliminating the need for an expensive flaring tool - simply remove the old valve and install the new one! Fittings are also available separately here. Our kit includes a Wilwood adjustable proportioning valve, two high-quality steel adapter fittings, and a union fitting. Complete installation instructions are shipped with each kit. |
How would this work on a 2001+ ABS car ?
|
It's been a while since I've had my hands on a stock 2001+ 3-channel ABS system, but I believe it still has a single brake line running from the master cylinder to the ABS pump, and then onwards to the rear brakes. You would just remove the factory prop valve and install the Wilwood piece with our adapters as normal.
The Wilwood valve works just like the factory prop valve - it just allows you to alter the knee point by adjusting the knob. The adjustment being made and the logic behind it isn't always intuitive for most folks, so I'll be doing a short tech article later this week on the logic behind an adjustable prop valve and how to set it up in your car. |
Originally Posted by arildh
(Post 834867)
How would this work on a 2001+ ABS car ?
|
Originally Posted by NiklasFalk
(Post 834873)
If there is no proportioning valve to replace the Wilwood prop valve will do nothing.
Let's take your example of no current proportioning valve. We can think of this as simply a union where a proportioning valve would be meaning the rear brakes are seeing full pressure. By installing a proportioning valve in place of that union in the rear line, you can limit this pressure applied to the rear brakes. This means that even if you aren't replacing a proportioning valve, adding an adjustable proportioning valve will still work to the same effect. |
The 01-05 ABS controls the pressure to the rear to the level of max tire slip according to the ABS calibration.
Using a mechanical prop valve to limit the max pressure available to the ABS/EBD sounds daft to me. Replacing a static mechanical prop valve with an adjustable one is a good thing, then you can increase the pressure for the knee. I have one myself. If you disable the ABS/EBD on the 01-05 you might be able to dial in better rear brakes, but as long as it's active any mod you make will not allow any more slip on the rear tires than the ABS calibration does (and Rcomps and slicks have more grip to give at higher slips than street tires for which the calibration is done). The brakes on the 03 I had was pretty awesome in balance on simple Rcomps (RA-1 etc). It always snaked a bit due to EBD modulation but never too much (I struggle to get the same feeling on the 99 with the adjustable valve). |
Steal fittings are nguyen.
|
Originally Posted by NiklasFalk
(Post 834987)
The 01-05 ABS controls the pressure to the rear to the level of max tire slip according to the ABS calibration.
Using a mechanical prop valve to limit the max pressure available to the ABS/EBD sounds daft to me. Replacing a static mechanical prop valve with an adjustable one is a good thing, then you can increase the pressure for the knee. I have one myself. If you disable the ABS/EBD on the 01-05 you might be able to dial in better rear brakes, but as long as it's active any mod you make will not allow any more slip on the rear tires than the ABS calibration does (and Rcomps and slicks have more grip to give at higher slips than street tires for which the calibration is done). The brakes on the 03 I had was pretty awesome in balance on simple Rcomps (RA-1 etc). It always snaked a bit due to EBD modulation but never too much (I struggle to get the same feeling on the 99 with the adjustable valve). |
ABS only is one thing (and I agree with the setup procedure, balance is just as important with ABS, if not more), ABS/EBD is something else since the front/rear balance is continuously adjusted using the ABS sensors and pump.
Unless you disable that function there is no way to get more brake in the rear than the system allow. To get less brake in the rear is not needed IMHO since the ABS/EBD is doing a good job. Changing the number of teeth on the ABS sensor rings could be one way to fool the ABS, but that's something different. |
Originally Posted by NiklasFalk
(Post 835063)
Changing the number of teeth on the ABS sensor rings could be one way to fool the ABS, but that's something different.
|
Originally Posted by NiklasFalk
(Post 835063)
ABS only is one thing (and I agree with the setup procedure, balance is just as important with ABS, if not more), ABS/EBD is something else since the front/rear balance is continuously adjusted using the ABS sensors and pump.
Unless you disable that function there is no way to get more brake in the rear than the system allow. To get less brake in the rear is not needed IMHO since the ABS/EBD is doing a good job. Changing the number of teeth on the ABS sensor rings could be one way to fool the ABS, but that's something different. If the ABS/EBD is performing modulation with speed/slip feedback and you have altered the mechanical proportioning, how will this effect the performance of the brake distribution improperly? Altering the pressure distribution is not altering the ring feedback which you I believe you are saying is the feedback variable for the system. Even with ABS/EBD, a proportioning valve should have no ill effects and should allow an installer to now better match brake components. It shouldn't be necessary with stock brakes. For racing, the bar type valve installed in the car is a nice idea for different drivers. Changing the number of teeth on the rings for the wheel speed sensors would put the system in perpetual slip thereby activating ABS prematurely or possibly put you in a predefined slip region continuosly. |
Perfect timing. Order placed.
|
Originally Posted by vtjballeng
(Post 835258)
You are saying the system works by speed differential, not pressure monitoring? I don't know what the system is looking at but am a little interested.
If the ABS/EBD is performing modulation with speed/slip feedback and you have altered the mechanical proportioning, how will this effect the performance of the brake distribution improperly? Altering the pressure distribution is not altering the ring feedback which you I believe you are saying is the feedback variable for the system. Even with ABS/EBD, a proportioning valve should have no ill effects and should allow an installer to now better match brake components. It shouldn't be necessary with stock brakes. For racing, the bar type valve installed in the car is a nice idea for different drivers. Since the system is looking at slip even too large pistons in the rear calipers should (experience would be valuable of course) be handled without mods, not in a good way of course since the EBD will need to act earlier. This situation could be modified with an adjustable prop valve to reduce the max pressure. But if this will make the EBD more sluggish, I don't know. I see it as adding a mechanical prop valve in series with an computerized one working of the ABS sensors.
Originally Posted by vtjballeng
(Post 835258)
Changing the number of teeth on the rings for the wheel speed sensors would put the system in perpetual slip thereby activating ABS prematurely or possibly put you in a predefined slip region continuosly.
I have not investigated the Miata ABS enough to say that it would have any effect, but altering the pulse trains coming from the sensors could be another thing to try (no need to machine several sets of rings and change them between tests). |
Gents, can we break the ABS discussion into another thread? Thanks.
|
Originally Posted by Savington
(Post 835535)
Gents, can we break the ABS discussion into another thread? Thanks.
So, uh... I'm helping you sell some product Andrew because it should work ABS/EBD or not. |
All times are GMT -4. The time now is 09:41 PM. |
© 2024 MH Sub I, LLC dba Internet Brands