first meeting for LS 914, Racing at the MG Classic meeting, Manfeild Park |
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first meeting for LS 914, Racing at the MG Classic meeting, Manfeild Park |
returf |
Nov 16 2016, 11:58 AM
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#1
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Member Group: Members Posts: 67 Joined: 15-August 12 From: New Zealand Member No.: 14,806 Region Association: Australia and New Zealand |
While most of you guys are nearer the end of your racing season, we are just beginning down here in New Zealand. I finally managed to get my car to it's first meeting last weekend. A classic meeting that is in it's 31st year of running and right at my local track. Practice went well but i noticed that I still had the wheel shake up front under brakes. Race 1 was going well with a demon start but unfortunately a lower arm on the left front broke and that put me out for the rest of the day. Day two, and another good start and went from grid 18 to 9th before the first corner, gee it's got great acceleration!!! Race three and off to a flyer again but three corners from the chequered flag and an axle broke. But all'n'all a great start to the 914's racing. Here's a video of race three. check out the shaking. Once i get that sorted i'm sure i'll be able to brake a lot later.
https://www.youtube.com/watch?v=C4OPnfSt_Lw |
wndsrfr |
Nov 16 2016, 07:24 PM
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#2
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Senior Member Group: Members Posts: 1,430 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Crazy fast, thanks for sharing--especially like the left hand shifting arrangement, cool.
I'm betting on a warped rotor or at least uneven bedding of the pads/rotors. Put a dial indicator against the front rotors & rotate them to check warp/runout. Bedding a new set of pads/rotors takes a series of hard stops & then a cooldown time of about 5-10 minutes & never sit still with foot on the brake if they're at all hot. Keep us posted! |
Cracker |
Nov 16 2016, 08:49 PM
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#3
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States |
Another potential issue is a wheel out of balance. Did you mount the outside weights on the inside of the drum or lip of the wheel? If inside, it gets too hot there - you will need to mount them on the lip (and tape them too). I bet you will find this is most likely the issue. The date says 2013 - wrong? What gear box are you running?
PS: I just watched the video...you might BOTH rotors and wheels out of balance. That is crazy amounts of shaking. Keep us posted... Tony |
returf |
Nov 16 2016, 10:58 PM
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#4
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Member Group: Members Posts: 67 Joined: 15-August 12 From: New Zealand Member No.: 14,806 Region Association: Australia and New Zealand |
I'll check it out in the next few days Tony. the rotors are new J Hook AP's and I bedded the brake pads in at Friday practice. I suspect that some of the problem may lay in the attachment of the caster arms ( too light given the torque applied when braking) but I'll let you guys know what I find re runout ect. |
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