Your question is kind of complicated, because I've been so busy lately. I'm currently sold out...sorry. However; it takes me about four hours to make one so I can certainly make you one but at this time I have no idea when I could ship it. If you are not in a hurry I will put you on the list and contact you when I have one ready to ship. If you want an estimated wait time I'd say one to two months. It's sad but that's how backed up I am with projects. There is no need to respond, I will automatically contact you when I have something available. Just make sure you set your messaging preferences to send you an email when you have a personal message sent.
Aaron, I sent you a PM about this two weeks ago but haven't heard back... there is a problem with the proportioning device I received that makes it leak.
I finally got the proportioning adjuster installed and tried bleeding the brakes. A master cylinder and 4 hours later I've tracked the bleeding problem down to the proportioning adjuster.
Fluid is leaking past the spool stem seal on the face of the bias adjuster body, and air is getting sucked in through the same location. The seal in question is the o-ring that's behind the staked-in aluminum ring at the front end of the body.
The spool stem has a diameter of 0.248" as measured with my Harbor Freight digital calipers.
The ID of the o-ring seems reasonable; it drags on the spool stem when it's installed. I think either the o-ring is not the right size, or the stem of the spool in my combination valve is a different size than you expected. I actually have two different '88 Fiero prop valves and the spool stem is the same, so it's most probably the o-ring OD. The o-ring moves side to side a bit in the bore as if the bore is too large or the o-ring is too small on the OD. The fit in the ID of the o-ring is good..
UPDATE 2014-04-06 - Aaron sent me a new adjuster body shortly after I made this post. I installed it over the weekend and it works properly. The one I had before had too much o-ring clearance on the OD due to a problem with the tool used to make it. The new one works great!
[This message has been edited by Steven Snyder (edited 04-07-2014).]
I got my new proportioning valve adjuster from Aaron installed and quickly set it up with some test stops around town, then headed out to Buttonwillow Raceway in Central California for two back-to-back days at the track.
Quick background: 1988 Fiero coupe with a 3.4 DOHC, Bilstein and Koni suspension, 700 lb springs up front, 475 in the rear, 12" C4 rotor upgrade from West Coast Fiero using stock '88 Fiero calipers and Porterfield R4 racing pads. 215/45/17 BFG Rivals up front and 275/45/17 BFG Rivals in the rear. The tires are staggered to match the weight distribution. The car weighs 2940 with me in it, with a 43%/57% weight distribution.
HOLY $#!&! Adding some more rear brake bias transformed the car. Three major things happened: 1) The front brakes no longer overheat after a few hot laps, because they aren't working as hard now that the rears do something. 2) Overall braking is SIGNIFICANTLY increased. I had trouble locking up the brakes. It just stopped harder and harder and harder. Braking was very progressive. 3) I can now brake hard enough without locking up that the brake pedal is finally down to the height of the gas pedal.... which means heel-toeing is finally possible. Fanastic!
Now I would say the two biggest, most important changes I've ever made to the car are matching the tires to the weight distribution, and adding this brake proportioning valve adapter. Great product.
Note that I can't make any recommendation for street use since I pretty much only drive this car to and from the track. The adjuster does allow you to go back to stock bias very easily though.
Aaron88, I am impressed with this testimony but i can't hold out any longer. I need to improve my brake proportioning so if you are not in production I will need to settle for an aftermarket replacement for the whole unit.
Sorry people, I have been really busy trying to get my car back on the road. There are so many things that have to be done that I haven't had any time to make more adapters. At this point I still don't have an ETA. The outlook is actually worse than last time I posted since it's taking so much longer to get things done than I had originally anticipated.
However; I will fill every order (that remains) in due time. For those that can't wait I do understand, and I hope that there are no hard feelings.
I read your PM and put you on the list at that time. I had nothing to report so I felt that responding to your PM was not necessary as it would have transferred no additional information. I'm sorry if you were offended by that.
I have an event that I'm trying hard to get my car ready for in August but there is still a lot of work to complete. A few years ago I started a rebuild on my car and the work has been lingering since. I rebuilt the top end of my Northstar, re-designed the suspension and braking system. A complete list of modifications are not possible for me to list but I can list some of the more major ones: New front and rear suspension geometry to gain more camber New cradle for new suspension attachment points (universal) Modified front suspension to accept the Corvette C5 front knuckle Design and built rear knuckle to work with new geometry Redesigned 5 speed shifter to work with F23 trasmission with stock cables. Skin the underside of the chassis (ground effect) Ram air intake that works
I still have to knock of half those items by mid August.
I'll be back at this after that.
If there was more demand I would just have them manufactured by a high volume company but I would need an order of 100 or more. Right now I sell 15 or less per year, so I make them as I go. Sorry again all about the delay.
I read your PM and put you on the list at that time. I had nothing to report so I felt that responding to your PM was not necessary as it would have transferred no additional information. I'm sorry if you were offended by that.
I have an event that I'm trying hard to get my car ready for in August but there is still a lot of work to complete. A few years ago I started a rebuild on my car and the work has been lingering since. I rebuilt the top end of my Northstar, re-designed the suspension and braking system. A complete list of modifications are not possible for me to list but I can list some of the more major ones: New front and rear suspension geometry to gain more camber New cradle for new suspension attachment points (universal) Modified front suspension to accept the Corvette C5 front knuckle Design and built rear knuckle to work with new geometry Redesigned 5 speed shifter to work with F23 trasmission with stock cables. Skin the underside of the chassis (ground effect) Ram air intake that works
I still have to knock of half those items by mid August.
I'll be back at this after that.
If there was more demand I would just have them manufactured by a high volume company but I would need an order of 100 or more. Right now I sell 15 or less per year, so I make them as I go. Sorry again all about the delay.
I was looking for how do we get more pressure to the rear brakes. I am collecting parts for a Lebaron brake upgrade but the 2.5 from vs 2 1/8 rear piston gives way to much front bias for me. Was hoping there was a way to offset that by increasing rear or decreasing front pressure relative to the other end of the car. Will this valve adjust the bias over the the whole range, only after knee point or only near lockup?
Am really considering one of your valves for my 86SE. Did I miss how much you are charging now?
