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Cobra #3170 01-09-2016 10:24 PM
Cobra Picture
 
My co-driver ( Scott Fraser) just sent me this photo of me driving my car at this years solo II National Championships. It is my all time favorite photo because it shows the car at maximum cornering load, note all green indicator lights are on,
1/2 throttle (4 of 8 lights) and brakes applied. The photo as posted is a little blurry but you can see the right hand wheels are almost in the air. This truly shows how hard this car can be pushed on street tires. Look closely at the left rear tire and you can see the distortion at the rim. I hope the picture shows larger than a thumbnail (I have never mastered the art of posting pictures)

http://www.clubcobra.com/photopost/d...obra_autox.png

twobjshelbys 01-09-2016 10:40 PM
Amazing!

Fast289 01-09-2016 11:03 PM
That is a great photo, what tires are you running? Air pressure?

Thanks

Snake2998 01-10-2016 12:14 AM
Wow - thanks for posting it - gives us something to aspire to.

Ron61 01-10-2016 03:08 AM
That is a great picture and really shows how well you have the car set up for that track. I will try to make it larger for you. Thanks for posting it.

http://www.clubcobra.com/photopost/d...obra_autox.png

Ron

Tommy 01-10-2016 05:35 AM
Too cool. It reminds me of when I'd see fog coming from the wings of my jet telling me I was getting about all there was from it and the air.

fordracing65 01-10-2016 07:04 AM
Try that with BFG radial T/A, lol, which most on here use...:JEKYLHYDE

Dwight 01-10-2016 07:15 AM
OK Tommy explain "my jet"


Dwight

Tommy 01-10-2016 09:45 AM
Dwight,
I sent you a PM.

Cobra #3170 01-10-2016 10:21 AM
Sizing Picture
 
Quote:
Originally Posted by Ron61 (Post 1377291)
That is a great picture and really shows how well you have the car set up for that track. I will try to make it larger for you. Thanks for posting it.

http://www.clubcobra.com/photopost/d...obra_autox.png

Ron
Thank You Ron!

Thanks to everybody for your compliments, tires are 335x30x18 Rival S rears at 22 psi and fronts are 275x35x18 Bridgestone RE71-R at 28 psi. I am putting extended nose's on the front shocks to increase droop be 1" so the front and rear contact will be closer to equal after seeing this picture.

1985 CCX 01-10-2016 11:17 AM
Love action shots. Especially vintage cars taking it to newer cars.

bobcowan 01-10-2016 11:20 AM
right side tires are off the ground, and are doing nothing except hanging there. Looks like you need more spring.

Morris 01-10-2016 11:22 AM
Bruce

Tires in the air have no traction........your tires appear to have good adhesion so getting them on the ground will mean faster times.....:):)

Cobra #3170 01-10-2016 11:52 AM
Weight Transfer
 
Quote:
Originally Posted by bobcowan (Post 1377325)
right side tires are off the ground, and are doing nothing except hanging there. Looks like you need more spring.
Weight transfer is related to CG height and track width only more spring will not help other than to overload the outside tires contact patch a little sooner.

This is not only based on the physics of suspension dynamics but on trial and error too. Maximum cornering G's were achieved with these street tires at the current spring rates. I have spring sets from 300 lb/" to 1200 lb/" in 50 lb/" increments and in some cases 25 lb/" increments. Believe me, we have tested lots of combinations of sway bar and spring rates and found that the laws of physics have not been repealed. Some contact is better than no contact so increasing droop will help but reducing roll will not reduce weight transfer other than a very small amount related to cg height change. a 25 pound per inch front spring increase cost about .5 seconds during our last test. The Cobra is cursed with a short wheel base and narrow track width, neither are good for cornering stability.

mickmate 01-10-2016 05:54 PM
Brilliant shot Bruce. Congrats on the results of your perseverance and dedication to the ultimate set up.

Buzz 01-11-2016 07:29 AM
Absolutely incredible stuff, Bruce! Keep on pushing it and keep the pics and updates coming. Thanks for sharing.:)


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