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The YouTube video is dated March 2021 so I guess that's when he decided to go public with it.or this just recently came out.
I believe that video is unlisted, only those in possession of the link can view it. We weren't supposed to share it.The YouTube video is dated March 2021 so I guess that's when he decided to go public with it.
I believe what you're seeing is body roll with the (much) lower roll center of the Mumford link.After the 2:30 mark it looks like a lot of side to side movement in the rear axle. It actually looks unstable to me.
I think I get what your saying but the Cortex video ( post# 20) looks rock solid in regards to lateral movement compared to the Mumford Link video but maybe it's just the camera angle and the way I'm interpreting it.I believe what you're seeing is body roll with the (much) lower roll center of the Mumford link.
With the Panhard & Watts, the RC is about axle height, so when the body rolls around that point, a camera mounted to the body and looking at the diff doesn't see much, if any, lateral movement of the axle, only rotation. But with the RC at ground level, when the body pivots around the RC a camera on the body looking at the diff "sees" the axle moving laterally with the body roll, but it's really the body moving on a different virtual pivot point. It's a frame-of-reference thing.
It does point out that you need to consider the change in body roll-induced lateral movement in relation to the wheels if you're running wide rear wheels/tires and are tight on wheelwell clearance. You might get sidewall rubbing with the Mumford when you didn't with a Panhard or Watts.
I think its still what the other DaveW said, the RC is still setup close to axle height on that Cortex video and certainly not on the KB one.I think I get what your saying but the Cortex video ( post# 20) looks rock solid in regards to lateral movement compared to the Mumford Link video but maybe it's just the camera angle and the way I'm interpreting it.
It’s called a Mumford link.Kenny actually didn't invent it, the basic concept was in an ancient engineering book he came across decades ago and liked the idea and developed it for the s197.
Very interested to hear updated feedback on the K-link. It obviously gets the rear roll center much lower than a Watts and a Panhard, but "real world results" are what count in my book. FOUR SECONDS a lap?!? That's, well, almost unbelievable.I installed the K-link this summer. My first impression while the car was on jack stands was that rear axle had a crazy level of articulation compared to the panhard bar. The car does handle differently so there is some learning curve on the new handling characteristics. The car feels much more planted at corner entry all the way through corner exit. At HMP, my home track, I bested my quickest lap time by 4 seconds between two back to back sessions. This was especially impressive considering i was running smaller diameter tires than normal (30/650 vs 30/680) and not having 5th gear due to no synchronizers! I am looking forward to seeing what the car is capable of next year with the larger diameter tires and a healthy transmission.
What times are you running at Topeka?I installed the K-link this summer. My first impression while the car was on jack stands was that rear axle had a crazy level of articulation compared to the panhard bar. The car does handle differently so there is some learning curve on the new handling characteristics. The car feels much more planted at corner entry all the way through corner exit. At HMP, my home track, I bested my quickest lap time by 4 seconds between two back to back sessions. This was especially impressive considering i was running smaller diameter tires than normal (30/650 vs 30/680) and not having 5th gear due to no synchronizers! I am looking forward to seeing what the car is capable of next year with the larger diameter tires and a healthy transmission.
I test fit the K-link on my 2012 Mustang GT and did some street driving early in development. That's my car in the videos. Surprisingly, I didn't notice ANY increase in NVH. Very impressive. Because of the lower roll center, KB justifiably specifies higher rear spring rates, but for my street test, I left the spring rates alone. The car naturally felt pretty soft in the rear and understeered at the limit, hence the need for higher rear spring rates. I'm really intersted to hear more detailed feedback from track users. So far, it clearly looks to be a massive (and positive) departure from the status quo in aftermarket rear suspension.@Dark Horse Holy smokes 4sec per lap! That's incredible. Is your car a dual purpose car? If so, how is it on the street?
I don't have experience on track yet, but the few people that I've heard use this on their track car, LOVE it. Because the rear roll center is so low, you have to run significantly higher rear spring rates...which makes sense.Im going to pull the trigger on this for my build. Anyone have any more data on lap time improvements with it?
Yup, KB said 650lb and 650lb springs. Im looking at coil overs as I have a unknown setup in the car. I am trying to see if they can get me the coilovers and k-link in time for my Sept race. I would rather do it all at once, I have a opportunity to return to KB part of the rear grip kit I have not installed yet to save a few bucks. I have the KB k-member in the car already.I don't have experience on track yet, but the few people that I've heard use this on their track car, LOVE it. Because the rear roll center is so low, you have to run significantly higher rear spring rates...which makes sense.
Have you driven the car with this K-member yet?I have the KB k-member in the car already.
Sounds like a great build! Please keep us posted on progress.No, still building the car. Its at the body shop, I have been going nights working on it, should be glassing in the brake ducts tonight and getting some primer on the bare metal spots. Its getting close to being sprayed.
I will install the caliper upgrades last so I dont end up twisting the new brake lines. Just a little wiring to go, rear wheel studs, belts, dyno, and KB rear stuff left to do.
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We have a new track open a couple hours from me, the club booked 2 races, Im trying to make the second one. Compared to our small local track this will be awesome ! I went crazy on aero for this track.
- shows a lap, 36 meters of eleveation change.