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Ottawa Fiero Club Forum  |  Buy/Sell/Trade  |  Parts  |  Topic: adjustable brake proportioning valve « previous next »
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Question: would you buy one?
yes (don't care what it cost)   -3 (42.9%)
no   -2 (28.6%)
yes but, only if under $75   -2 (28.6%)
Total Voters: 5

Author Topic: adjustable brake proportioning valve  (Read 9522 times)
aaron88
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Kempvision
« on: May 09, 2006, 03:01:25 pm »
I designed an add-on to make the proportioning part of the combination valve adjustable.

I’m wondering how many people would be interested in one.  It’s fairly simple design so it shouldn’t cost much to have made.  I'm re-using the spring and rubber seals, so I’m thinking somewhere around $50.  I’ll have a better idea after I test the prototype to see if it needs a re-design.

I’m not going to eat the cost of having them made since I’m not going to mark up the price, so don’t answer unless you are absolutely sure of your answer.

If all goes well I may make them available for general sale.


Aaron

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dguy
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« Reply #1 on: May 10, 2006, 08:42:44 am »
What will be adjustable--the "delay" in rear brake application when one mashes the pedal quickly, the overall front/rear balance, or both?
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aaron88
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Kempvision
« Reply #2 on: May 11, 2006, 12:38:33 am »
The adjustability is for the front to rear bias.  Assuming that you will be increasing the rear bias the delay would be reduced (slightly) to the rear brakes (increasing the controllability while braking into corners).  This used in conjunction with a 2 lb residual brake pressure valve (Willwood) would be ideal for autocross and overall control.

However I don't personally plan on using a residual pressure valve.

Aaron

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UPDATE  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Reducing the delay timing on the rear brakes, which is about a tenth of a second due to the extra passages and length of line is much too complicated to achieve inside the desired sail price.  So that issue has not been addressed.

Alternately you could use a residual pressure valve in line with the rear line after the proportioning valve.  This would decrease the rear brake piston travel, thereby achieving the desired result.

Aaron
« Last Edit: June 19, 2006, 12:34:31 am by aaron88 » Logged
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34FieroGT
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This, is my BOOMSTICK!!!
« Reply #3 on: May 11, 2006, 07:53:57 am »
Sounds good!  I would be interested in one.
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dguy
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« Reply #4 on: May 11, 2006, 08:22:46 am »
What ^^^ said.
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aaron88
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Kempvision
« Reply #5 on: May 15, 2006, 10:03:36 am »
I suppose this thread should be in mods?
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aaron88
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Kempvision
« Reply #6 on: May 19, 2006, 02:30:12 pm »
Here is a preview.
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aaron88
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Kempvision
« Reply #7 on: June 07, 2006, 01:48:13 am »
I can't seem to find that motor trend video that showed all the model years and more importantly the stoping distance for the 88 model. 128' I think and from some speed, I can't remember.

anyone?...anyone?....Bueller?...Bueller?
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Your only limitations are set from within, by a lack of vision.  But to have vision alone leaves the process idle.  Ergo, without action your thoughts are worthless.
aaron88
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Kempvision
« Reply #8 on: June 11, 2006, 09:27:23 pm »
Bueller?.....Bueller?....Bueller?
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Your only limitations are set from within, by a lack of vision.  But to have vision alone leaves the process idle.  Ergo, without action your thoughts are worthless.
aaron88
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Kempvision
« Reply #9 on: June 15, 2006, 11:53:06 pm »
update

Tested and working!

Constructing second prototype.

88 and pre-88 are different springs and spring rates.
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dguy
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« Reply #10 on: June 16, 2006, 09:54:45 am »
Quote from: aaron88 on June 15, 2006, 11:53:06 pm
update

88 and pre-88 are different springs and spring rates.

But of course!

BTW I think we have two or three of the pre-88 combination valves if you need one for any reason.
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aaron88
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Kempvision
« Reply #11 on: June 16, 2006, 09:51:36 pm »
Couldn't hurt to check them for tolerancing.  No rush though.

Aaron

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dguy
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« Reply #12 on: July 03, 2006, 02:54:02 pm »
Managed to dig up three of them, each with a different casting number FWIW.

Pick a time & place....
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1984: Track car project.
1985 SE: Dead 2.8, stalled L67 swap.
aaron88
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Kempvision
« Reply #13 on: July 03, 2006, 10:30:04 pm »
Quote from: dguy on July 03, 2006, 02:54:02 pm
Managed to dig up three of them, each with a different casting number FWIW.

Pick a time & place....

Sweet...

Probably lot numbers (casting run numbers) so they know which ones to chuck if there's a bad run.

I'm in the middle of a move right now, I'll be at it for just over a week to come (painting and all that other stuff).  But I do think I can manage to get over to see Kitten at work this week if that's not too much to ask?

Aaron

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Your only limitations are set from within, by a lack of vision.  But to have vision alone leaves the process idle.  Ergo, without action your thoughts are worthless.
dguy
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« Reply #14 on: July 04, 2006, 05:40:40 am »
Quote from: aaron88 on July 03, 2006, 10:30:04 pm
But I do think I can manage to get over to see Kitten at work this week if that's not too much to ask?

No problem at all.  She has them with her as of this morning.
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1984: Track car project.
1985 SE: Dead 2.8, stalled L67 swap.
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Ottawa Fiero Club Forum  |  Buy/Sell/Trade  |  Parts  |  Topic: adjustable brake proportioning valve « previous next »
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