15" vs 18"

[Cobra #3170]

Originally Posted by G-Pete

15 inch for street and 18 inch for track, really?

Now watch this video of Bill Shepherds Cobra....


Nurburgring Aug 2010 Cobra incar footage - Bill Shepherd Mustang - YouTube



.....he is running 15 inch. Tell me again about 15/18 street/track again.

You put him on 18" Hoosier A6's with proper camber and spring rates and he would pick up 6 seconds a lap. I ran 15" back when they actually made good slicks for 15's (1970's), LMS 16" slicks in the 1980's and 1990's on wider than stock rims (9.5 F and 11 R) and now 18" on (11" F and 12" R) and I can tell you there is no comparison. Yes, part of it is modern compounding but the steering response is so much more precise with low aspect ratio's I would never go back. There is also the problem of tire distortion under high loads
with large aspect ratios especially with poor suspension geometry. There is a reason that the automobile and tire companies gravitated toward larger wheel diameters, they are better.

[G-Pete]

Originally Posted by Cobra #3170

You put him on 18" Hoosier A6's with proper camber and spring rates and he would pick up 6 seconds a lap.

So, if you think that you can beat me on the track (245/15 & 295/15 Avons), come on down here - we have some interesting tracks. Who looses pays the track time ---- how about that?

[fordracing65]

Originally Posted by G-Pete

So, if you think that you can beat me on the track (245/15 & 295/15 Avons), come on down here - we have some interesting tracks. Who looses pays the track time ---- how about that?

Have you seen this Cobra run, until your car wins the Optima challenge and is not invited back cause he was too fast all my money is on Cobra 3170, I'll pay tract time and bet you thousands if you want, Bruce are you in?

[G-Pete]

I know who Bruce is, I would not challenge an amateur.

[fordracing65]

Originally Posted by fordracing65

Have you seen this Cobra run, until your car wins the Optima challenge and is not invited back cause he was too fast all my money is on Cobra 3170, I'll pay tract time and bet you thousands if you want, Bruce are you in?

I have money on this let it happen, lol lol

[Cobra #3170]

Originally Posted by G-Pete

So, if you think that you can beat me on the track (245/15 & 295/15 Avons), come on down here - we have some interesting tracks. Who looses pays the track time ---- how about that?

Beating you would be fun, why don't you come out here, Willow Springs will be running this coming May with the Cobra club, if you are faster I'll pay your entry fee, in fact I'll pay your entry fee to get you out here.
My front tires are 315x30x18 and rears are 335x30x18 and I would estimate that I have 400 HP on you, I am pretty sure you won't be visible in my mirrors after 2 laps.

[G-Pete]

Originally Posted by Cobra #3170

Beating you would be fun, why don't you come out here, Willow Springs will be running this coming May with the Cobra club, if you are faster I'll pay your entry fee, in fact I'll pay your entry fee to get you out here.
My front tires are 315x30x18 and rears are 335x30x18 and I would estimate that I have 400 HP on you, I am pretty sure you won't be visible in my mirrors after 2 laps.

Sure you would at Willow Springs, my car is setup for acceleration not for top speed (4.10). The car is too tall (front) and too light, under 2000# for speeds above 140mph.

The Horse Thief Mile comes in mind....

Anyhow - are you saying, you have 870 HP?

[fordracing65]

Originally Posted by G-Pete

Sure you would at Willow Springs, my car is setup for acceleration not for top speed (4.10). The car is too tall (front) and too light, under 2000# for speeds above 140mph.

The Horse Thief Mile comes in mind....

Anyhow - are you saying, you have 870 HP?

I believe his new engine does and it revs past 10g, cost around 50g, fuel injected ,Should I go on and on, it makes me horny if I do...

[fordracing65]

Originally Posted by Cobra #3170

You put him on 18" Hoosier A6's with proper camber and spring rates and he would pick up 6 seconds a lap. I ran 15" back when they actually made good slicks for 15's (1970's), LMS 16" slicks in the 1980's and 1990's on wider than stock rims (9.5 F and 11 R) and now 18" on (11" F and 12" R) and I can tell you there is no comparison. Yes, part of it is modern compounding but the steering response is so much more precise with low aspect ratio's I would never go back. There is also the problem of tire distortion under high loads
with large aspect ratios especially with poor suspension geometry. There is a reason that the automobile and tire companies gravitated toward larger wheel diameters, they are better.

This guy knows PERFORMANCE, when it comes to Cobras Bruce is a God...

[Dimis]

Originally Posted by fordracing65

This guy knows PERFORMANCE, when it comes to Cobras Bruce is a God...

No disrespect... I'm aware of Bruce's achievements (outstanding by the way), but I'll see your cobra god, and raise you Morris.

[Cobra #3170]

Originally Posted by Dimis

No disrespect... I'm aware of Bruce's achievements (outstanding by the way), but I'll see your cobra god, and raise you Morris.

Morris has addressed and solved the biggest problems with Cobras, bad aerodynamics, my car would not stand a chance with him on a road course because the body is stock. If we were in a low speed autox the results would be different. We had different goals in developing our cars and I think we both succeeded.

[Dimis]

Originally Posted by Cobra #3170

Morris has addressed and solved the biggest problems with Cobras, bad aerodynamics, my car would not stand a chance with him on a road course because the body is stock. If we were in a low speed autox the results would be different. We had different goals in developing our cars and I think we both succeeded.

I go fishing to catch me a "65 racing ford" and I catch me a "3170 cobra".
Oh brother... Obviously I used the wrong bait...

Oh well. While I got you on the line $500 say I got you beat!
In fact YOU can even pick the car I RACE YOU IN.
Track - you've already nominated Willow Springs.
I'll even pay for my own entry.
All you have to do is cover my expenses to get there.

Let's see if you're brave enough to take that challenge on.

[fordracing65]

Originally Posted by Dimis

I go fishing to catch me a "65 racing ford" and I catch me a "3170 cobra".
Oh brother... Obviously I used the wrong bait...

Oh well. While I got you on the line $500 say I got you beat!
In fact YOU can even pick the car I RACE YOU IN.
Track - you've already nominated Willow Springs.
I'll even pay for my own entry.
All you have to do is cover my expenses to get there.

Let's see if you're brave enough to take that challenge on.

Funny,