corner entry push - Page 3

coyled · #41 (**permalink**) 10-06-2002, 09:25 PM

Richard, thanks for the comments. The settings are 5 bump and 7 rebound on all 4 corners. I do have problems getting the power down out of slow speed corners(under 45 mph) but I have always had that problem with bfg's, hoosiers or goodyears. The rolling chassis I used to feel is gone now and initial turn in is better. If I went with some new shocks I would want some fully adjustable. I am tempted to go down another 50 pounds in rear spring rate to see if it hooks just a little better. The car had that awesome feeling in the carosel of perfect 4 wheel drift. I could balance it nicely with the throttle. I do want to check the rear toe in(in bump) and see if there are changes under throttle. I have a funny feeling that there may be some more toe out going on under throttle with my lesser rear springs and more squat now, which would help cause some oversteer. I am running a 1/16 in at normal ride level. There is always something to change or tinker with. I have to tell you. I have never felt anything like a 650hp cobra with slicks and open pipes, yah baby!!!! scott

coyled · #42 (**permalink**) 10-07-2002, 07:35 AM

Richard, I am allready 1 compound harder in the rear but I think I am going to go another compound harder in back. What would the effect of a harder compound be? longer to warm up? less preasure buid up? more ultimate grip? scott

Richard Hudgins · #43 (**permalink**) 10-07-2002, 10:56 AM

Scott,

I am really going to confuse you now.

First, before you do any changes in tire durometer, you must check the tire temps. Are you over heating the rears? Or are they running the right temps. The pressure gain in the back may be normal for the tire. It could be that you are not working the fronts hard enough to get them up to the temps of the rears.

Since you are already one step harder in the rear, you really need to check temps!!! Also, you need to check the damper rates as discussed above.

One thing that will really confuse the setup process are tires. Strangly enough, it is easier to over heat a hard rear tire as you can put a bunch of heat into them due to slippage from them being cold. In other words you can go right past the optimum temp and over heat them very quickly.

The bottom line, is you need to check the temps of the tires before you make any decisions as to compounds.

Also, did you compare your laps times from this last track session to previous ones? I recommend that you also start doing sector times. This is really important when dialing the car in.

coyled · #44 (**permalink**) 10-07-2002, 07:02 PM

Richard, the tire temps in the past were in the 175 to 185 area in back, the fronts were 15 degrees cooler. They could be a bit hotter now as I am driving it harder. This is usually after 1 cool down lap. Incidently, goodyear does not make the same rear tire as I am running anymore. My only choice is 1 or 2 steps harder, which is what finish line is running in the spec racer. Double adjustables are like 500.oo each. ouch. It might be cheaper and faster for the driver to get better. Anybody else running double adjustables or adjustable shocks? What kind are you guys running?What kind of preasure build up are you other cobra guys getting with your goodyear bias ply's? Thanks for the help, scott.

Richard Hudgins · #45 (**permalink**) 10-07-2002, 07:29 PM

Scott,

175>185 is good for temps as measured in the pits. Your differential of 15 degrees is also quite good. But, you must not do a cool off lap. Got to come right in and measure. One lap does funny things to temps.

It would be interesting to see what they are with your new setup.

I know that the dampers are expensive, but they are worth their weight in gold when you really wish to make the chassis work.

I personaly like Penske dampers as they have the best customer service out there in the US. Plus, they will give you hours of free engineering time to help sort out the car. (At the price, they should give you a bit of sex as well.)

Sorry, I have no current info on Bias ply tires. Radials are my current experience (10 years) and they are a entirely different beast.

The bias tires feel the best to the driver, You know, they slide nicely, are very forgiving, and are great for four wheel drifts. But they do not give the same adhesion levels as a radial.

If you can get a radial for your wheel sizes, I would recommend fitting them. They are much better tires overall, and you will find temp and pressure stabilty much better.

Now, I know there must be a bunch of folks out there running similar setups to Scott's.

How about some input here. Help him out. He needs to beat all of those Z06's.

coyled · #46 (**permalink**) 10-10-2002, 07:33 AM

Richard, I like the bias ply's for the forgiveness. I am going to look around for shocks. I think I am going to run willow springs at the end of the month, cobra owners club. Thanks for the advise. Scott