 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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| SirAndy |
Dec 3 2005, 02:12 PM
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Resident German Group: Admin Posts: 41,688 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
when i upgrade my brake system to a 19mm MC and mid '80s carrera rotors (vented) & calipers on all 4 corners i noticed that, with the stock prop valve still in place, the rear brakes did barely do anything. almost all of the braking was done by the front brakes. i replaced the prop vale with a "T" per brad's advice. he said that they had similar problems with all their race-build 914s and they first tried running adjustable prop-valves but always ended up running those on full open. which is exactly what the "T" does, except it's 100 times cheaper than a cockpit adjustable prop-valve ... now, with the "T" in place, front and rear brakes seem to do about the same amount of work, with the fronts locking up just a bit earlier than the rears. when i hit the brakes hard at speed, the whole car goes down evenly as compared to before with the prop-valve where the front would do a nose-dive while the rear got lifted up ... i'm happy with my "T"! (IMG:http://www.914world.com/bbs2/html/emoticons/boldblue.gif) Andy |
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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 rick 918-S Here's my spin on the deal. I'm running la... 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 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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