 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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| kdfoust |
Dec 2 2005, 12:19 PM
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Senior Member Group: Members Posts: 694 Joined: 2-January 03 From: Riverside Member No.: 71 Region Association: Southern California |
I think that in panic stops on the street the worst case scenario can happen very quickly: non-progressive brake actuation, slamming on the brakes, which doesn't allow for weight transfer and front tire loading to acheive maximum traction during the stop. This means the fronts lock before being loading to their limits via weight transfer and even worse the rears may lock. This is why ABS is so effective on street cars but a little less of an advantage on race cars. Every good driving instructor I've had always emphasized not standing the car on it's nose with hard braking. The reasoning is that even on a fairly balanced car you don't want to unload the rear tires anymore than necessary in case you need to do some steering. At Willow Springs I can be reeling the "other Porsche" down from 130 and those brakes will stand the car on it's nose if I ask them to. At those speeds you really don't want to "upset" the chasis anymore than needed. (IMG:http://www.914world.com/bbs2/html/emoticons/burnout.gif) Later, Kevin |
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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 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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