Possible e30 rear break upgrade
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Interesting idea! It definitely would be a nice option since there really isn't a 'cheap' rear brake upgrade. One thing I would recommend is using some sort of machined spacer/ring to take up the space between the rotor and the hub and properly center the rotor. If you just rely on the lugs you could get some nasty vibration because the rotor won't self center when you have a wheel attached
I do agree with you on the locating. I believe I had mentioned that I would use the original hole to hold the rotor in location after the lugs are not in place.
yes I will have to add the hole in the correct locationSent from my iPhone using Tapatalk
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I think he's talking about some kind of hub spacer. Even using the screw to hold the rotor on won't guarantee it's centered correctly. Honestly, you don't even need that screw in there if the rotor is hubcentric. Those screws are usually only there for manufacturing purposes so it doesn't hit someone in the head going down the line. GM uses virgin clips instead of the screw.
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I think he's talking about some kind of hub spacer. Even using the screw to hold the rotor on won't guarantee it's centered correctly. Honestly, you don't even need that screw in there if the rotor is hubcentric. Those screws are usually only there for manufacturing purposes so it doesn't hit someone in the head going down the line. GM uses virgin clips instead of the screw.
Correct it won't guarantee that it's in the exactly the correct location but I feel confident that it would be with in + or - .010 which will be well within centered.
I do also agree that the screw is not needed. And is mostly for the assembly line.
But I was trying to think of options with doing a budget build. The rotor is only about .03 to .04 a side bigger on the hub where it locates so make a spacer would be extremely hard to manufacturer and to ensure that the spacer would be parallel and round. In the event that this does work. Haveing to make a spacer would increase the price of the swap.
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saying the e30 rear brakes are under-powered is a bit of a internet myth. with upgraded pads are very capable of locking up the brakes without much effort.
however, if your rat rod is going to weigh more than a stock e30 its a good idea. either way, I love creative ideas and will love to see this accomplished.
They are not under powered but in track use the suffer from heat soke
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making a 'spacer' should be pretty easy. think of it as a shim. buy some steel strips of the correct thickness, cut to the correct length (circumference), then just tap it in.
Dan
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Fyi, maximum allowable runout is typically .002".
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Fyi, maximum allowable runout is typically .002".
Run out on the diameter or being true to its self
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.002 would be side runout spec or axial runout. Radial runout is not going to be that tight of a tolerance. It would be easy to use feeler gauges around the hub and lock the assembly screw to hold it in place until the wheel is on. You would easily be +/- .005 using feeler gauges. Then you could verify axial runout with 2 lug bolts installed to make sure your rotors are in good shape.
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