Suspension, Tires, Wheels

Brake Temperatures, Stohr Floating Rotors, brake issues, etc.

feeds@yuku.com (Jake Latham) — Tue, 08 Dec 2009 15:39:09 GMT

Hi everybody -

Few quick questions with a long story behind them:

1.) What sort of temperatures do you see on the front brake rotors in your car? (using temp paint etc).

2.) Has anybody else experienced difficulty with the Stohr floating rotors, and their tendency to cease, uh, floating? Solutions?

Longer story:

I upgraded by Stohr to the floating rotor setup at the early part of last season, to combat what I thought was a pad knockback issue....

Chassis dive

feeds@yuku.com (kiwimanz) — Sun, 18 Oct 2009 23:59:16 GMT

Hey guys, can a few of you let me know how much dive you see in your chassis under braking. It would also be helpful to know what type of car you drive. I'm trying to compile some data for my new suspension design.
Cheers
Linz

IR sensor placement for tires

feeds@yuku.com (blentz2) — Sun, 18 Oct 2009 22:20:55 GMT

All,

I believe I have seen all the threads on this that exist on this website, but I still have a couple of lingering questions that I am hoping this savvy group of folks can help me with.
1. I have the ability to have 2 sensors only on my front tires - where would you point them?
2. How big a "spot" am I targeting to be sure I get a clean signal?
3. How big a deal is it for them to be mounted fixed (vs on something that mounts to the upright and turns...

CV Joint removal

feeds@yuku.com (kiwimanz) — Wed, 07 Oct 2009 21:35:48 GMT

Hey anyone know how to remove the out board cv joint on my AMAC?
It has the splinded output shaft for the hub.
No circlip either!
Thx
Linz

Spring rates vs sway bars

feeds@yuku.com (herman pahls) — Sun, 20 Sep 2009 01:40:04 GMT

Track photos of my car show lots of body lean compared to other sports racers. Out-board shocks front and rear.
Wheel travel to shock travel approx. 1.6-1 . 600lb. rears and 500lb. fronts, no sway bars and 1070lbs. without me.
I was considering going to 900lb. springs but something tells me sway bars are the answer since it seems many older
sports racers are successful with springs in the 400- 500 lb. range. Please advise.
Thanks Herman 541 404 6464 Oregon

Tire Preservation

feeds@yuku.com (Derek Harling) — Wed, 16 Sep 2009 20:47:12 GMT

Does cling film on the tread work? In other words does it help preserve 'stickiness'? - I presume by preventing or at least reducing evaporation of some rubber component.

I've got an almost new set of soft Avons which I want to keep over the winter. If I use cling film are tire bags any additional help?

My basement stays at about 65deg all the time - is this better than my storage unit which would be below freezing for 2 or 3 months?

camber change

feeds@yuku.com (Jswilson87) — Fri, 04 Sep 2009 07:09:17 GMT

I am switching from bias ply to radials and my tire rep says to take some camber out with the new tires. He did not know how much though....any advice?

Jeff

Suspension analysis poll

feeds@yuku.com (J Block) — Tue, 01 Sep 2009 17:37:45 GMT

If you had a computer application for suspension analysis, what would you want to get in the way of output?

Rain Tire Scrub-in ?

feeds@yuku.com (Clark Lincoln) — Tue, 25 Aug 2009 18:09:14 GMT

Is this a good idea? What technique? (Hoosier rains)

Late race handling issues

feeds@yuku.com (Jake Latham) — Mon, 24 Aug 2009 10:58:36 GMT

Hey all -

Had a question I thought I'd run by you, although the answer may be obvious, in hindsight.

Last weekend at MAM, and to a greater degree this past weekend at HPR, my car's handling went off pretty noticably late in the race - perhaps 2ish seconds per lap. It seems like it happens quite rapidly over the course of a few laps or so, then slowly worsens throughout the remainder of the race. It seems to be more pronounced in slower corners than in higher, as...

Setup Rig

feeds@yuku.com (David Arken) — Sun, 26 Jul 2009 13:24:11 GMT

Wandering around Autobahn Country Club I spotted this setup rig.
David

Cheetah brake caliper mount

feeds@yuku.com (LoloJay) — Mon, 29 Jun 2009 21:50:55 GMT

I have a slightly bent caliper mount on my '99 Cheetah...TDC carrier with Wilwoods. May be able to straighten the bent one, but want to replace it. Looks like a billet piece, anodized black. Can't find a listing that I can match up on the internet...(help?)

Thanks! Jay

Brake bias

feeds@yuku.com (Dan Frost) — Mon, 29 Jun 2009 17:05:12 GMT

Newbie to the class needs help. Is there easy way to check and adjust front to rear brake bias without the use of pressure gages. I need a method that ballpark about 55% to the front brakes (that was a number that I used when running my IT 510). I am running Cheetah with Willwood four pots in the front and AP two pots in the rear. When I was prepping the car for my outing in April I found the brake bias adjuster cable frozen. Was able to free it up and visually tried adjust the balance...

How Important is Bump Steer?

feeds@yuku.com (Derek Harling) — Tue, 09 Jun 2009 12:05:18 GMT

I know the theory and I can visualize why it is important on older softly sprung cars. But my question is - is bump as important on modern very stiffly sprung race cars?

It's not the same question but I'm thinking of current F1 cars where the front suspension has drooping a-arms to optimize front wing aero at the expense of 'perfect' front suspension movement which apparently is minimally important on these stiffly sprung cars with as much or more compliance in the...

Rain tires + wheel sizes

feeds@yuku.com (Jake Latham) — Tue, 26 May 2009 11:51:41 GMT

All -

As I alluded to in my other thread about Kodiak, I've got a whole buncha Kodiaks that came with the car. One pair of rears is 1/2" narrower than the others, owing to a smaller outer shell. The resulting sidewall shape (bit more bow) causes the 22x10 GY to rub a bit on the side of the tunnel, so I don't run these.

My thought is to use these for rain tires, and run a 22x9 rain on them instead, paired with the usual 20x8 rain tire up front, to avoid the...

Upper A-arm design

feeds@yuku.com (herman pahls) — Mon, 18 May 2009 01:45:33 GMT

Is there a simple upper A-arm design that allows Quick camber adjustment ( say loosen lock nuts and turn left and right hand threaded coupler ) that does not effect castor or toe in? If so would you mind sharing the design? Herman

Tire Trolley

feeds@yuku.com (Derek Harling) — Fri, 15 May 2009 17:02:20 GMT

What are these called? Where would one buy one? Mr Google hasn't helped so far, nor RacingJunk. If I could bend and weld I'd make one. Figured it will be easier/cheaper to buy one and modify rather than design a special to fit and then find a fabricator. Thx - Derek

Measuring tire spring rate

feeds@yuku.com (peter j raymond) — Thu, 14 May 2009 13:19:22 GMT

I've added to or started a few topics in the last couple of days, but people may have wondered where these posts were coming from, since these were my first contributions in years. I've competed in a Lotus 7 based Solo DM car since 2002, but since 1978 I've autocrossed several cars in several classes. Probably the best of them all was a Citation FF in CM. I was the first person to autocross this particular car that has now won National championships with 3 different...

Mono-tube shock model

feeds@yuku.com (peter j raymond) — Tue, 12 May 2009 12:57:35 GMT

I've measured the shaft diameter (0.43"), travel (4.72") and gas pressure for my mono-tube shocks. For 100 psi of gas pressure extended and 120 psi compressed I calculate an average extension force of 16 lbs and a spring rate of .6 lb/in. It seems like a reasonable model for the shock would be to model these forces as an additional (negletable?) spring in parallel with the coil and the velocity dependent forces from the shock. However Penske says: "Increasing or...

Kodiak Racing Wheels still around?

feeds@yuku.com (Jake Latham) — Tue, 12 May 2009 12:07:55 GMT

I've been trying to get them on the phone for the past few days, nothing. Anybody know of anything up with Kodiak, or am I just having bad luck?

-Jake