Adjustable proportioning valve - How did you do?

[Lee]

I am contemplating several ways to install an adjustable prop valve. Interested in looking at what you have done. I initially thought I could install it under the hood, near the MC (easiest solution) but am now contemplating installing it within the cockpit. I may replumb the whole line from the MC to the rear splitter, within the cockpit.

[MrNvgtr]

You can kind of see how mine was done by the prior owner here. Its the red thing on the drivers side of the trans tunnel.

[Lee]

Hi Michael

I checked several different cars, and it seems that everyone puts the brake line on top of the tranny tunnel, from the bulkhead to the rear axle. I will try to find 10mm bulkhead fittings tomorrow.

Lee

[TobyB]

Mine was like Michael's, but on the passenger side of the tunnel.

It's nice to be able to dial out some rear for a hot, greasy track or in

for rain... if you're careful.

I've spun myself a few times this season..

t

[powelli]

Here is how we ran it on mine.

[madjurgen]

Excellent timing Lee, I need to do this soon as well.

Powelli, did you just cut the line, and invert flare each end with 3/16" fittings? As opposed to trying to bubble flare it with metric fittings, which Ive read is much harder. If so where did you get your fittings from?

[Lee]

Here are a couple of shots of my interior, also showing how I installed my prop valve on Friday. You may notice that all four drain plugs are removed. I just hosed down and soaped the interior to remove grit and drilling pieces. It is very practical and helps keep the car clean.

[madjurgen]

What fittings did you use? Looks like 2 or 3 on each side.

[Lee]

What fittings did you use? Looks like 2 or 3 on each side.

The Wilwood valve has 1/8NPT inlet/outlet. So, I used what I had on my shelves to convert from 10mm. 1/8NPT-to-AN4, then AN4-to-10mm.

Tilton makes prop valves that have metric 10mm inlet/outlet.

[madjurgen]

When running the two new lines, MC to valve and valve to T in the rear, did you use BMW lines or from somewhere else?

[Lee]

When running the two new lines, MC to valve and valve to T in the rear, did you use BMW lines or from somewhere else?

Initially, I wanted to use the original line. I wanted to cut the rearward line under the prop valve, make two small holes in the tunnel and pass the two lines into the cockpit. But I tried to flare the original line with a flaring tools and found that the original BMW brakelines are exteremly difficult to flare as their steel is quite tough. so, I bought a 30" line (rear) and 51" (rear, but should have gone for 60") at my local NAPA shop for $8 total. They already had all the fittings and were very easy to bend.

I am currently building an e46 racecar with friends and will still get aftermarket brakelines as they are very easy to work with.

[JohnN]

or do you have a source for plate that is already drilled?

Thanks!

John N

[Lee]

or do you have a source for plate that is already drilled?

Thanks!

John N

Drilled by hand, hole after hole. That's the labour of love.

Anyway, over the winter, I will probably make some dead pedals like the one on the passenger side, and a prop valve mount. all with drilled aluminum plates.

Lee

[madjurgen]

Anyway, over the winter, I will probably make some dead pedals like the one on the passenger side, and a prop valve mount. all with drilled aluminum plates.

Lee

Do the accelerator pedal as well, that thing is beautiful. I'd buy one in a heartbeat.

Thanks for explaining how you plumbed the valve.

[Lee]

Anyway, over the winter, I will probably make some dead pedals like the one on the passenger side, and a prop valve mount. all with drilled aluminum plates.

Lee

Do the accelerator pedal as well, that thing is beautiful. I'd buy one in a heartbeat.

Thanks for explaining how you plumbed the valve.

The pedal is on a hinge that uses the two stel nipples from the floorpan, which means that unlike stock plastic pedals, they cannot pop out. Which can be regretable during a race. It also uses a bearing on the lever rod behind the pedal.