lookforjoe Posted May 4, 2009 Report Share Posted May 4, 2009 Fair enough, so is that on the stock proportioning system? If so, is there really a noticeable increase in braking ability/performance? I'm guessing it's a fair cost/weight penalty to fit these rears which might not be worthwhile...? I figured to get any real benefit from these you would have to fit an adjustable bias valve and tune until you had the brake balance optimal, which was why I was making the point about the consequences of locking the rears up (I figured most people could imagine the stability/handling consequences of that but might not think about the poor AWD system!).I did consider fitting the MY2000 stock vented brakes to my 98 alongside my front Porsche BBK, but I really couldn't see even that giving more actual braking performance except on the track under repeated hard use with little cool-off time. The front BBK is a no-brainer really, despite the weight/costs of it you're going to have hugely better braking from it. But I wonder about the rears given how little of the braking they actually do. All interesting stuff tho, and if you say it's noticeable and worthwhile then I'd believe you Right now I have the R AWD rear vented rotors & calipers - which were an improvement over the stock solid rotor setup. To be honest, I have no clue how much gain I will see from the larger brakes - just the fact that you're moving the braking point further away from the center has to be an improvement, but really, I'm doing it so that I have matching LARGE brakes front & rear. I want the rears to match the front - these fill the wheels so much better! Link to comment Share on other sites More sharing options...
NChoy Posted May 4, 2009 Report Share Posted May 4, 2009 Hussein,Can you give us some information on who this "Aaron" is, and how we can contact him about the brackets.I may be able to score a set of 996 calipers that match my big reds in color... still negotiating on price. I already have the rear rotors. Link to comment Share on other sites More sharing options...
lookforjoe Posted May 4, 2009 Report Share Posted May 4, 2009 Hussein,Can you give us some information on who this "Aaron" is, and how we can contact him about the brackets.I may be able to score a set of 996 calipers that match my big reds in color... still negotiating on price. I already have the rear rotors.He's the one doing the work on Nick's car - RaceLabFabrications. He's going to do a group buy on the custom brackets required for this setup. I suggested he post it here as well as on VS."ajhehr" on VS The calipers should be 996-351-425 & 426 Link to comment Share on other sites More sharing options...
Rabin Posted May 4, 2009 Report Share Posted May 4, 2009 Can't wait to see pics of the caliper adapter...I need to fab some adapters up and am still wondering which way to go - but simple angle iron (angle alloy?) seems like the best proposition so far.I also found these which might work as well:$110/pair shipped.Rabin Link to comment Share on other sites More sharing options...
lookforjoe Posted May 4, 2009 Report Share Posted May 4, 2009 Can't wait to see pics of the caliper adapter...I need to fab some adapters up and am still wondering which way to go - but simple angle iron (angle alloy?) seems like the best proposition so far.I also found these which might work as well:$110/pair shipped.RabinInteresting. What are the dimensions on those, and what's the source? Those could work IF the overall dimensions & offset are appropriate - I have spare stock AWD calipers so I can measure the spacing. Drilling & tapping accurately would be the issue - can't afford any mistakes.I wouldn't use regular angle iron - I'd be worried about flex. Link to comment Share on other sites More sharing options...
Rabin Posted May 4, 2009 Report Share Posted May 4, 2009 Here are the dimensions the seller provided. I won't know if they work till I get my calipers and can work out the dimensions needed.As for using regular angle iron - that was never a consideration! I'd need to spec out what was available, and if nothing suitable was found I'd have it machined out of billet.I liked these, but they were designed for the 3.5" (89mm) spacing of the later series 944's, and my car uses the earlier 3" (76mm) spacing which should still be fine.As far as drilling them - I've got buddies with the equipment necessary to do a perfect job, so no worries there. Trick will be getting the proper dimensions of where to drill the holes.SourceRabin Link to comment Share on other sites More sharing options...
lookforjoe Posted May 4, 2009 Report Share Posted May 4, 2009 Here are the dimensions the seller provided. I won't know if they work till I get my calipers and can work out the dimensions needed.As for using regular angle iron - that was never a consideration! I'd need to spec out what was available, and if nothing suitable was found I'd have it machined out of billet.I liked these, but they were designed for the 3.5" (89mm) spacing of the later series 944's, and my car uses the earlier 3" (76mm) spacing which should still be fine.As far as drilling them - I've got buddies with the equipment necessary to do a perfect job, so no worries there. Trick will be getting the proper dimensions of where to drill the holes.RabinThose would work with my 996 calipers - but I'd need to measure the Volvo mounting lugs to see if that aligns - then there's the question of the offset.S60R rear rotors are 330mm, 28mm disc thickness. 996 calipers are intended for 31mm rotor thickness, so that would give a little axial wiggle room...996 mount landing is 160mm total length 130mm center to center (holes) 100mm inside landing, 40mm wideEDIT: Volvo AWD rear caliper mount spacing is 90mm on center Link to comment Share on other sites More sharing options...
lookforjoe Posted May 5, 2009 Report Share Posted May 5, 2009 ...continuedWe need to know these two measurementsI'm assuming that since the stock rotors are 250mm, and the new are 330mm, that the calipers needs to be offset 40mm to compensate? The stock calipers have a 37mm offset from center of mount ear to center of piston. The Porsche calipers are offset 40mm from landing to piston centerIf thats the case, that bracket doesn't look like it will move it out far enough, does that make sense? Math never was my forte... Link to comment Share on other sites More sharing options...
Rabin Posted May 5, 2009 Report Share Posted May 5, 2009 Yup - makes complete sense. In my case I'm going from 274mm rotors to 302 mm - so not nearly the same increase in diameter you're doing. So by your calcualtions you'd need a minimum offset of 37mm to get to the landing, and then you need to have enough material around the mount holes for strength... Easily a 55 - 60mm dimension would be needed I'd guess.I'll send Albert your pic of the added dimension requirement to see what it is. I sent a link to him as well - maybe they have the resourses to have some custom to spec. Might be possible if there was enough interest.Rabin Link to comment Share on other sites More sharing options...
momof94850-tx Posted May 5, 2009 Author Report Share Posted May 5, 2009 Aaron has all of this done. Everything is at the CNC place and will be released shortly.Nick Link to comment Share on other sites More sharing options...
lookforjoe Posted May 5, 2009 Report Share Posted May 5, 2009 Yup - makes complete sense. In my case I'm going from 274mm rotors to 302 mm - so not nearly the same increase in diameter you're doing. So by your calcualtions you'd need a minimum offset of 37mm to get to the landing, and then you need to have enough material around the mount holes for strength... Easily a 55 - 60mm dimension would be needed I'd guess.I'll send Albert your pic of the added dimension requirement to see what it is. I sent a link to him as well - maybe they have the resourses to have some custom to spec. Might be possible if there was enough interest.RabinIf I get the time, I'll pull a rear wheel/caliper/rotor & test fit the porsche one - should get a better idea of exactly what's needed. I have a spare set of stock calipers, I can cut down a slider bracket to mock up the adapter. Link to comment Share on other sites More sharing options...
lookforjoe Posted May 5, 2009 Report Share Posted May 5, 2009 Aaron has all of this done. Everything is at the CNC place and will be released shortly.NickGood news. I wish I wasn't so impatient Nick - there were no issues with the stock eBrake setup, correct?Did you need spacers for your rims? Looks like they'll clear my pegs, but I'm not 100% sure... Link to comment Share on other sites More sharing options...
lookforjoe Posted May 5, 2009 Report Share Posted May 5, 2009 Had nothing better to do this morning, so I played around with caliper mounts...comparing offset..trial fit on my 99 XC parts car....I tried welding up a bracket to test fit, and even this moves the caliper too far out radiallyThe bracket needs to be basically flush with existing lugs... maybe something like thisanyway, I'm looking forward to getting Aaron's brackets... Link to comment Share on other sites More sharing options...
momof94850-tx Posted May 6, 2009 Author Report Share Posted May 6, 2009 Good news. I wish I wasn't so impatient Nick - there were no issues with the stock eBrake setup, correct?Did you need spacers for your rims? Looks like they'll clear my pegs, but I'm not 100% sure...As far as I know all is fine. I'm not with the car though, about 5 hours away.I'm running teams with 5mm spacers. Don't think we had to use the spacers though.Nick Link to comment Share on other sites More sharing options...
ajhehr Posted May 8, 2009 Report Share Posted May 8, 2009 Ok here they are.996 boxter S front, (or 911 turbo rear, or 911 front) caliperss60 R rotorsrear dust shield must be removed or cut. OR you can mill a little off the back of the s60r rotors + a little cut on the shield.e-brake is retained.there is a little grinding on the stock tabs for the original brakes. I will supply a guide block to assist.gb to follow...I have to have at least 5 people interested to give these anymore time.I also have front brackets for the 996 TT front to fit on the front.the FWD 996 boxter S calipers will follow shortly.admin. Sorry if this is overstepping,final price is yet to be set, but will decrease with interest. I will also be at or under the price for the current options.Thanks! Link to comment Share on other sites More sharing options...
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