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Opeler
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1,742 Posts
Quote:

How to make a small fortune at auto racing?

Start off with a huge fortune.

I think it was John Mecom who said that.
 

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Opeler
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1,742 Posts
Mike, Glad you had a good time, but. And this is not a knock, what the heck?

With all the stuff you have, and stuff you did. Why are you so slow?

I know GT speedo's are not that accurate, and the tachs are notoriously unreliable, but I've done better than that on the Interstate in Texas.

I didn't have three miles either.

Or all that aero stuff, but I suggest your gains there are slight, because a GT is a slippery beast to start with.

Is it the extra weight in your car, of the cage and all those cameras? Or is something wonky with your combination, IE: cam, gearing, tire size, whatever?

I'm sitting here scratching my head, because I figured you would have been at least eight, or so MPH faster than that.

Oh well, it is what it is, and like I said, this was not intended as a knock.

But just for the heck of it. When you do your post run, and the next pre race inspection, you might want to check throttle travel, and see if it opens all the way.

Cause something just don't add up.
 

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Opeler
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1,742 Posts
I think I can help with this one a little: Bonneville is, well...Bonneville. If it was easy everyone would do it.

You've got a road surface that can change day to day. It can be hard like concrete, can have standing water on it, or it can 'give' like beach sand. Never consistent.

You also have that elevation thing. 4000 feet above sea level. So figure 16% less power or so than you make at sea level.

Higher temps, also less power.

Weight doesn't affect top speed. Only how long to get there.

Gearing is important though. Fall out of your powerband and you're not going fast. A Getrag (and stock 4-speed) have horrible rpm drops between shifts. Judging by Mike's speeds and the rpms he was spinning, he would have a higher top speed in 5th gear with a 3.89 final drive. It would rev a little higher and put the engine back into its' powerband. 4200 rpms would turn into 4700+ rpms in 5th at the same speed.

I ride a KLR 650 dual sport bike. Not fast by any means. Maybe 105-107 mph top speed. I know of a guy with 'The worlds fastest KLR'. Makes about 60% more power than stock. Full aero bodywork. The bike goes 112 mph at Bonneville. That's it! It took him years to go that fast, the first two times he went he was slower than a stock bike.

Bonneville is NOT easy...
Now that makes sense, most of Texas is pretty close to sea level, our roads are paved with solid grippy rubber due to all our truck driving friends, and yeah, there is a difference in power between a hot afternoon, when it's 107 in the shade, (and 120+ on the Interstate). Versus late at night when it's cooler.

Maybe, since you don't have any rules to follow. You could rig up a water injection system with a fine spray, and somehow rigged to rpm, as to density, or pressure.

Food for thought.
 
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