clsatt Posted February 5, 2008 Share Posted February 5, 2008 has anyone thought about mounting the brakes just off the diff to reduce unsprung weight? I'm by no means ready to attempt something like that on my own project, but it does seem like a good topic to delve into. what would it take to make it work? would it really benifit performance? I've only seen it done on cobras and some truely bad ass old vettes. what are your thoughts? chris Quote Link to comment Share on other sites More sharing options...
Careless Posted February 5, 2008 Share Posted February 5, 2008 theres a site with a yellow datsun 510 that has a Rotary engine and a jaguar rear end with inboard brakes. check it out on the goog'. Quote Link to comment Share on other sites More sharing options...
tube80z Posted February 5, 2008 Share Posted February 5, 2008 would it really benifit performance? I've only seen it done on cobras and some truely bad ass old vettes. what are your thoughts? A friend did this to a 510 racer years ago. It made virtually no difference to the car and he eventually went back to normal brakes. The only real advantage was people got all hot and bothered about it and it made it into the Japanese magazine Hero or something like that. Only downside is if you lose a half shaft you've lost a brake. Cary Quote Link to comment Share on other sites More sharing options...
clsatt Posted February 5, 2008 Author Share Posted February 5, 2008 thats good to know. has anyone done it to a 240? Quote Link to comment Share on other sites More sharing options...
Gareth Posted February 6, 2008 Share Posted February 6, 2008 There's a big disadvantage of using inboard brakes in racing applications - heat. More literally, it's cooking the rear discs and decreasing fade resistance as a result of lots of heat being generated by the differential. Jaguar once did it in Lightweight E-types, and most of the teams that ran these cars had to make air scoops over the trunk lid, to duct the air around the diff and the brakes. It still didn't make enough difference for anyone o notice... Besides the frequent brake failures of course. IIRC, Cobras had Girling brakes mounted inboard that came with the Salisbury differentials from the E-type. They might have been good enough for 289-powered street Cobras, but in racing applications (either 289 or the thumpin' 427 "side oiler") they were rather inadequate. It does have an advantage though: mounting the discs inboad opens up lots of wheel possibilities, and you're limited only by the available space. It's a great solution for drag cars, but I wouldn't do it in a road racing car. Quite a lot of problems for only a few advantages... Quote Link to comment Share on other sites More sharing options...
johnc Posted February 6, 2008 Share Posted February 6, 2008 Inboard disc brakes are also a pain to work on. And when you're racing, you're always working on the brakes. Quote Link to comment Share on other sites More sharing options...
clsatt Posted February 7, 2008 Author Share Posted February 7, 2008 so for realworld benifit they really don't offer anything. I guess they would be great on a show car though. doesn't sound like it's worth the trouble. thanks for the input guys. chris Quote Link to comment Share on other sites More sharing options...
JeffGarcia77 Posted February 8, 2008 Share Posted February 8, 2008 If you were to use Arizona Z Car's upcoming aluminum hub carriers in conjunction with inboard rear brakes, the rear of your car could conceivably have incredibly low amounts of unsprung weight (depending on tire and wheel weight). This might make a tangible improvement in cornering speeds, depending on how bumpy the driving surface is. Another old car that used inboard rear brakes was the Alfa Romeo GTV-6 from the late 70s/early 80s. Correct me if I'm wrong on that point. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted February 8, 2008 Share Posted February 8, 2008 The alfa did indeed have inboard brakes. They were a pain in the ass to work on as I recall, but it's been probably 15 years... Quote Link to comment Share on other sites More sharing options...
Bowtiez Posted February 8, 2008 Share Posted February 8, 2008 Heidt has a Corvette IRS with inboard brakes set up for hotrods for about $4000 but it looks like you would need to do a back half job to install on a Z but it looks like it might alos solve breakage problems with V8's. Quote Link to comment Share on other sites More sharing options...
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