GT Classification Worksheet

[FireSale]

Originally Posted by Dion Hildebrandt

yes 3469, but I do believe we are supposed to round to the nearest 10....so 3470

Shipping weight is 599 lbs lighter than that for the stock version of the 302 coupe. What was I thinking when I bought aluminum heads??? At least I won't have to worry about the weight of my mild steel cage any more...

Dale

[Ryck Campbell]

Fire Sale,

If you car is a convertible then 3369 is correct. If not then 3267 is the shipping weight to use. With the engine rated at 335 the your non convertible would run C @3185 or D @ 3350 or E @ 3520. A convertible would run C @ 3285, D @ 3350, E @ 3520 or F @ 3685. These weight are class minimums. The convertible can't get to the top of C and would have to run 100 heavy for the class.

[FireSale]

Originally Posted by Ryck Campbell

Fire Sale,

If you car is a convertible then 3369 is correct. If not then 3267 is the shipping weight to use. With the engine rated at 335 the your non convertible would run C @3185 or D @ 3350 or E @ 3520. A convertible would run C @ 3285, D @ 3350, E @ 3520 or F @ 3685. These weight are class minimums. The convertible can't get to the top of C and would have to run 100 heavy for the class.

It's a GT build. A 68 Mustang coupe using the engine specs of the 302/230 found in the 68 Cougar. The rules say to use the heaviest gas engine body as the shipping weight, which is the 68 convertible 428/335 . That's where the 3369 comes from. The engine is rated at 220 with 10 added for the AFR 1399 heads.

As I understand it, GT is like building a car that never came off the production line even though it has the right brand parts in it. So a weight is assigned to the body and the class is determined by the engine factor. It could have been the actual weight of the body used (68 Mustang coupe) or an average 68 Mustang weight, but someone decided on using the heaviest one available. I guess.

Dale

[Dwight Southerland]

The heaviest coupe weight is 3241, which is what you would use for calculation. You would not use the convertible shipping weight for a coupe body.

[FireSale]

Originally Posted by Dwight Southerland

The heaviest coupe weight is 3241, which is what you would use for calculation. You would not use the convertible shipping weight for a coupe body.

Thanks. That's a further clarification. The rule just says heaviest vehicle and dosen't differentiate between heaviest 68 Mustang (the convertible) or heaviest vehicle you are using (68 coupe).

Thanks again.

Dale

[aross6]

Originally Posted by FireSale

Thanks. That's a further clarification. The rule just says heaviest vehicle and dosen't differentiate between heaviest 68 Mustang (the convertible) or heaviest vehicle you are using (68 coupe).

Thanks again.

Dale

Actually the rule doesn't say the heaviest vehicle, but rather "Shipping weight will be determined by using the
power to weight factor of the vehicle with the heaviest gasoline engine and appropriate transmission." The vehicle with the heaviest engine is usually the heaviest vehicle, but not always... just something to keep in mind.

[Dwight Southerland]

I think the wording is meant to imply the vehicle in question. In this current example the vehicle in question is a 68 Mustang coupe. Don't try to make their wording more technically legalistic than it is. The opening description of the rulebook section states "Cars will be classified using the shipping weight of the body divided by thehorsepower or performance rating of the engine used." The body in that statement is the body you have, not anything else. The intent is to use the heaviest shipping weight of the particular model-body you have. So, for example, you can't use the shipping weight of a 4- or 6-cylinder Camaro when calculating the class when the V8 models were heavier.