A fellow racer alerted to this video (link below)

I'm the red car 2 spots ahead of the camera car (Triumph Spitfire). After seeing the video it is pretty obvious that the car needs a panhard bar. I'd been driving around the outside of people all weekend in turn 1, even with the old tires, a couple of guys mentioned the car moved around A LOT and After seeing the video I can see why some folks find it alarming.
I have been wanting to get a panhard bar on it, even after installing the upgraded leaf spring bushes (per C-sedan suspension prep manual) it still does the "Hula"

Note I am only in the first minute of video, never did get past the yellow Volvo......the motor was real tired, after the race it had all of 80 psi cranking pressure.

http://www.youtube.com/watch?v=7TsTgZJULSM

Not as much as that Kharman Ghia though now that was scary.

Just make sure you have enough adjusment on the panhard mounts to play with the roll centres though when you do it.

It took me a minute before I realized which car you were talking about. The blue car at the end of the video was an Alfa Romeo and yes it was rather tail happy but I seem to recall it was leaking fuel out the filler and on to the left rear tire. What I remember most about it was the work of art alloy back axle. When I caught up to it, like a dufus I was thinking that back axle is really cool then my brain kicked back in with "brain to idiot your supposed to driving not spectating"

My car also does the hula in the corner leading to the big uphill section, which is a 90mph+ corner in my coupe. I can see why at the last track day a Porsche Cayman driver following me through there mentioned I had way more courage then he did. Like most motorcycle racers I am extremely comfortable with oversteer..........pretty much to a fault.

I'm doing a track day next month so I will try to get the car over to my fabricator buddies shop and get this sorted. It maybe entertaining to drive but it has to be scrubbing off speed. Even though I devour folks in the corners I still feel there is more corner speed in the car. If I can get it to skate though corners like I can with a Spec Miata I'll get in the top 3 and be able pull off slide jobs the way I want.........at the moment you can't quite be inch perfect.......it's more like 6 inch perfect.

Tom

I don't run a Panhard on mine and don't get that type of movement in the rear. I do get quite a lot of diff sideways movement but not as cyclic as you. I wonder if rear shocks might be at play here too?
https://www.youtube.com/watch?v=qcQ9KAjjViw
I'm on the scene from min 12 onwards. Excuse my racing, it was my first race weekend, still a lot to sort out with the car and especially the driver.

Tom,

Does you car have the C-Sedan traction bars?

After seeing the video I actually got under the car to see if anything was actually loose or tweaked. The rebound adjustable Konis are in the middle of thier adjustment; running near full causes the rear to jack down and makes it understeer on exit, running them too soft makes the car pogo up and down noticeably but not side to side. The left rear tire was actually losing pressure and I would have written this off to a cut tire but it behaved the same way at the next event. The track is a good bit wider than stock (3" inches or so) and the corner speed is much higher now. The couple of cars that I know running full slicks on leaf spring cars run a bar, I suspect The car may be generating just enough lateral force to get the whole process started. When I get the over to my buddies shop we will be inspecting everything (read he will inspect everything) before any mods are made.

As for your your first race, yeah you were rather polite and missed some marks but as a instructor and sometime coach I liked that you were willing to carry the brakes all the way into the apex and worked on hitting your marks, even when you clearly missed it looked like you knew you were off line.............you would be surprised by how many newbies have no idea they are way off line, watch all of the video I linked. I also wished my car had the oomph that yours appears to have.


Edit: Grover, yes it has the traction bars.


Tom

If you're running full slicks on this then you probably need the Panhard rod.

Grover,

I run Hoosier vintage TDs, pretty much slicks with grooves in them.

Tom

No doubt a lateral restraint will help locating the diff, a worthwhile upgrade in any case.
I have read somewhere that the twin tube konis aren't the best at controlling rebound.
Danny m on page 2 of the below link talks to the problem he was having with racing an escort.
http://www.rsmotorsport.com.au/forums ... c.php?f=25&t=377&start=20
There maybe something in it? Or maybe not.
For reference i run bilstiens, about 200lbs/in reverse eye leafs, urathane bushes and with the yoko a050s i generate around 1.5g lateral (maybe even a little more :)
I have the dyno printout of my rear shocks if you are interested in a couple of points off them for comparison. Drop me a PM if interested.

Bryan

Bryan what bushing material do you have for the rear shackle mount bolts through the frame?

I will send you a PM on the shocks.

Tom