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Spools used on a road race cars...
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<blockquote data-quote="racer726" data-source="post: 3052182" data-attributes="member: 12306"><p>Yeah, I hear that a lot from people about how bad it is... does kind of have me worried a bit, especially since I'm hearing it from someone who's tried it at the track. What kind of car was it, and how was it set up if I may ask? Not talking about the 93R I'm sure. Some people run them in A-Sedan, and I suspect some of those that do don't admit to it, and may even laugh at how ridiculous that would be. I've got the late Mark Donohue's book "Unfair Advantage" ... and it's pretty inspiring in some ways. Donohue dumped the limited slip setups to go with a spool, and the results were... well, written in the history books. Most drivers couldn't drive the car set up that way.</p><p></p><p>Not that my ego's telling me that I can because I'm better than most drivers... well, maybe it's at least telling me to try to make it work. Most people definately can't drive my car the way it's set up now... but for me it's right on the money. What I'm thinking is that the spool would be an interesting experiment to say the least.</p><p></p><p></p><p></p><p>I never made the comparison... I'm just happy if I can minimize the need to upgrade the braking capacity... the lighter the car, the less heat needs to be dissipated. Regarding wear on the pads, on the Mustang I've worn out 8-9 sets of front pads, and never experienced any uneven break wear. That's due to being lucky perhaps, but I'd like to think that it's because fo proper brake maintenance. The ol' PBR's are pretty light by the way, and caliper weight is unsprung weight.</p><p></p><p></p><p></p><p>I agree on the DSS and Cover. About that rear brace... I may fabricate something like that... I need to think about that one, nice idea, first time I've seen the picture, thanks for sharing that.</p><p></p><p> </p><p>Your right. After the years I've spent motorcycle roadracing, believe me... I know how to make things light the right way. I also think I have a pretty good understanding of the value of making things light, and the car responds extremely well to weight savings on the front.</p><p></p><p> </p><p>You'r probably right... on the other hand it's not like I can't simply swap it back later.</p><p></p><p></p><p>Motive makes them for $2XX, but I'm doing the lightening myself on the lathe, and also having the spool/ring balanced. We'll see if it lasts. The gears teeth aren't touched... but the lighter gear will have less heat capacity. Micropolishing should reduce heat generated, and cryo treating will hopefully increase wear resistance. The gears themselves are already heat treated, and the machined areas will not be working surface areas. </p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="racer726, post: 3052182, member: 12306"] Yeah, I hear that a lot from people about how bad it is... does kind of have me worried a bit, especially since I'm hearing it from someone who's tried it at the track. What kind of car was it, and how was it set up if I may ask? Not talking about the 93R I'm sure. Some people run them in A-Sedan, and I suspect some of those that do don't admit to it, and may even laugh at how ridiculous that would be. I've got the late Mark Donohue's book "Unfair Advantage" ... and it's pretty inspiring in some ways. Donohue dumped the limited slip setups to go with a spool, and the results were... well, written in the history books. Most drivers couldn't drive the car set up that way. Not that my ego's telling me that I can because I'm better than most drivers... well, maybe it's at least telling me to try to make it work. Most people definately can't drive my car the way it's set up now... but for me it's right on the money. What I'm thinking is that the spool would be an interesting experiment to say the least. I never made the comparison... I'm just happy if I can minimize the need to upgrade the braking capacity... the lighter the car, the less heat needs to be dissipated. Regarding wear on the pads, on the Mustang I've worn out 8-9 sets of front pads, and never experienced any uneven break wear. That's due to being lucky perhaps, but I'd like to think that it's because fo proper brake maintenance. The ol' PBR's are pretty light by the way, and caliper weight is unsprung weight. I agree on the DSS and Cover. About that rear brace... I may fabricate something like that... I need to think about that one, nice idea, first time I've seen the picture, thanks for sharing that. Your right. After the years I've spent motorcycle roadracing, believe me... I know how to make things light the right way. I also think I have a pretty good understanding of the value of making things light, and the car responds extremely well to weight savings on the front. You'r probably right... on the other hand it's not like I can't simply swap it back later. Motive makes them for $2XX, but I'm doing the lightening myself on the lathe, and also having the spool/ring balanced. We'll see if it lasts. The gears teeth aren't touched... but the lighter gear will have less heat capacity. Micropolishing should reduce heat generated, and cryo treating will hopefully increase wear resistance. The gears themselves are already heat treated, and the machined areas will not be working surface areas. Dave [/QUOTE]
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