 Rear Brake Hop, is it bias? |
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| nine14cats |
 Sep 8 2003, 10:31 PM
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#1
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Bill Pickering -- 914-6 GT aka....Leeloo  Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None  |
Hey Guys,
Here's a question on braking bias and how to solve a little occasional rear hopping. First the stats on the car: 911T Front Suspension including rotors and calipers '87 944 Front rotors and 914-4 Front calipers on rear. 23mm torsion bars front, 250lb springs rear Bilstein shocks all around. 22mm Front Swaybar, 16mm sway rear. Prop valve replace by brass T. Porterfield R-4's (fronts) all around Issue: On the track I love the brakes...not fading (I know, i'm not going fast enough) and it feels really balanced. On auto-x courses under HARD braking I get rear wheel hop. I have to admit that with more seat time I'm getting smoother and even my braking is getting better and the hopping is going away. But it's still there a little. My question is: is it all driver modulation related? or is the mechanical balance off? On the tracks it's great, but I get it occasionally on the auto-x courses. Thanks, Bill |
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| Brad Roberts |
Sep 8 2003, 10:33 PM
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#2
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
In a straight line ?? Loaded or unloaded side ??
B |
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| nine14cats |
Sep 8 2003, 10:35 PM
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#3
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Bill Pickering -- 914-6 GT aka....Leeloo Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None |
Hi B,
Only when the rear unloads and in a straight line. If there is any weight on the rear (either side) it doesn't happen. Got me an answer? (IMG:style_emoticons/default/laugh.gif) I'm betting it's driver (IMG:style_emoticons/default/blink.gif) Bill |
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| Brad Roberts |
Sep 8 2003, 10:40 PM
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#4
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
The T is too much rear bias in this case. It will go away with the LSD.
If you want to cure it for autoX.. run stock 914 pads in the rear calipers (poor mans bias adjust after installing a T) B |
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| nine14cats |
Sep 8 2003, 10:43 PM
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#5
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Bill Pickering -- 914-6 GT aka....Leeloo Group: Members Posts: 2,618 Joined: 10-February 03 From: Campbell, CA Member No.: 287 Region Association: None |
Thanks B,
I have a nice set of stock pads in the garage. I'll throw them on and let you know how they did at next weeks auto-x. I won't be getting to the LSD until the season is over. Bill |
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