 T fitting instead of prop. valve, what is the rational? |
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| DanT |
  Dec 1 2005, 08:18 PM
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Going back to the Dark Side!  Group: Members Posts: 4,300 Joined: 4-October 04 From: Auburn, CA Member No.: 2,880 Region Association: None  |
Ok, I know this has probably been discussed in many threads before. But, what is the reasoning for replacement of the Prop. valve with the "T" fitting for the rear brakes. Does the prop. valve cause more line pressure to the fronts or the rears when it is operating properly? I want to understand the engineering aspects of this modification.
I will be running "M" calipers with mythical billet hubs in the front and stock 914-4s in the rear. thanks (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) |
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| rick 918-S |
Dec 1 2005, 08:33 PM
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Hey nice rack! -Celette Group: Members Posts: 20,950 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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Here's my spin on the deal. I'm running larger diameter tires with a wider contact patch. The added unsprung rotating mass puts undue stress on the stock brakes. It has nothing to do with a larger motor, more HP or any other HP mod. In my opinion it's mass rotating vs applied force. I converted to BMW 2002 4 piston calipers in the front on the stock solid rotors. I added a 19mm 911 master cylinder to make up for the added fluid volume and reduce pedal travel. I eliminated the "P" valve to increase the pressure to the stock rear brakes. I like the feel. I've never felt as if I had too much rear clamping force. With less mass and a smaller contact patch a brake up grade isn't nessesary. IMHO
one observation, at Willow I had visable brake dust on all 4 wheels for the first time in my life that I can recall. I guess they were working (IMG:http://www.914world.com/bbs2/html/emoticons/aktion035.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/driving.gif) |
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Posts in this topic
Dan (Almaden Valley) T fitting instead of prop. valve Dec 1 2005, 08:18 PM
McMark The prop valve limits the amount of hydraulic pres... Dec 1 2005, 08:33 PM Headrage Jeez!!!
http://www.914world.com/bbs2... Dec 1 2005, 10:59 PM Dan (Almaden Valley) I am sure the reasoning behind the T is that putti... Dec 1 2005, 10:59 PM rick 918-S Dec 1 2005, 11:21 PM Dan (Almaden Valley) ... Dec 1 2005, 11:26 PM Brando Also keep in mind that with much better gripping t... Dec 1 2005, 11:35 PM McMark You mean, this graph Dave? http://... Dec 1 2005, 11:38 PM McMark Dec 1 2005, 11:42 PM trekkor Good thread. http://www.914worl... Dec 2 2005, 12:15 AM J P Stein Dec 2 2005, 07:15 AM andys Dec 2 2005, 10:52 AM Dave_Darling <... Dec 2 2005, 10:55 AM J P Stein Dec 2 2005, 11:22 AM andys ... Dec 2 2005, 11:39 AM kdfoust <... Dec 2 2005, 12:19 PM J P Stein Dec 2 2005, 01:39 PM nick mironov This is where I got my T-fitting ($8):
http:... Dec 2 2005, 02:04 PM horizontally-opposed Eric... http://www.914world.co... Dec 2 2005, 02:06 PM andys Dec 2 2005, 03:14 PM Eric_Shea First Post... http://www.914world.... Dec 2 2005, 05:20 PM J P Stein Brakes......a decent buy:
http://forums.pelicanpar... Dec 3 2005, 10:46 AM horizontally-opposed ... Dec 3 2005, 01:19 PM SirAndy Dec 3 2005, 02:12 PM nine14cats Hi Dan,
I'll give you what Doris and I were r... Dec 3 2005, 03:20 PM
J P Stein Basicaly, what Bill, Andys & I are talking about i... Dec 3 2005, 04:46 PM |
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