Adjustable Brake Bias Valve, experiences? installation? Options

[brant]

QUOTE (airsix @ Dec 22 2005, 11:29 AM)

QUOTE (Dave_Darling @ Dec 21 2005, 06:21 PM) QUOTE (brant @ Dec 21 2005, 03:28 PM) tune it in on a dirt road I would suggest tuning it on concrete--the grippiest surface you can find! You want to set it up for a worst-case, which is having the most weight transferring to the front wheels. That means sticky tires and a grippy surface. Set it so the rears are just shy of lock-up when you lock the fronts. (Ugh, sounds like a good way to flat-spot a set of stickies!!) --DD That's EXACTLY what I was going to say. If you tune the bias on a loose surface then you'll be locking the rears first when you get to a high-traction surface. -Ben M.

All right...
let me clarify my statement.
When FIRST starting out and trying to get a rough estimate I still recommend tuning on a dirt road.

I did it by having a 2nd party stand outside the car and making slow passes in a straight line at only 15 to 20mph
I did it by making sure that I was not getting rear lock up first.

Then after getting my rough settings, I moved to the race track and did fine tuning.

I understand the concern about weight transfer.
but I really didn't want to test my rough settings at 80miles per hour.

Once on the old race car I had things set a little too close and actually had just changed race pads which upset the balance. I was on the back straight at 2nd creek in 4th gear at over 100mph when the rears locked up first. I went off the track and down into a good sized drop off at 80mph BACKWARDS!

(luckily I only tore off the brake ducts, and didn't damage anything else except my pride) Really created a lack of trust on my part in the braking zone of that straightaway for the entire rest of the weekend.

This is why I advised tuning on a dirt road at a SLOW speed. Yes there is overall less weight transfer, but there is overall less grip on all 4 wheels too. you won't be able to fine tune the set up, but you can get it roughly set at alot safer speed

brant

[jhadler]

I jsut talked with a frined of mine who said that the lever type valve (Tilton) has a very narrow range of adjustment, and that at full open already yields a 50% pressure reduction, and full closed goes up to only 75 % reduction. Seems like a bogus design...

Anyone else with direct experience with these Tilton valves?

[JWest]

QUOTE (jhadler @ Dec 22 2005, 04:51 PM)

I jsut talked with a frined of mine who said that the lever type valve (Tilton) has a very narrow range of adjustment, and that at full open already yields a 50% pressure reduction, and full closed goes up to only 75 % reduction. Seems like a bogus design... Anyone else with direct experience with these Tilton valves?

Here is the Tilton chart: