GT class configuration...

[Chris DeGidio]

How do you figure class for a certain engine/car combo?? Combo in question would be a 71 Plymouth Duster with a 1970 383/335Hp engine.

[RPinoski1]

Just pick what ever GT class you want to run and multiply the hp to the class you choose. With the ability to adjust the shipping weight in GT the door is wide open to put a combo where it will be competitive.

[Bill Harris]

If you have Microsoft Excel you can use my class calcuator to find out which classes a particular setup can run. You need to know the shipping weight of the car, the factored HP of the engine, and the trans type.

You can download or run from:
http://www.employees.org/~bhracing/g...ulator_1p1.xls

[trmnatr]

Originally Posted by RPinoski1

Just pick what ever GT class you want to run and multiply the hp to the class you choose. With the ability to adjust the shipping weight in GT the door is wide open to put a combo where it will be competitive.

To the original poster, I dont mean to jump in on the thread but i have the same question

With a heavy car, Which GT class would a 327/275 or 327/300 fall under with an automatic?

[Chris DeGidio]

Thanks for the info guys.

The calculator works great,and easy to use.

Also thanks to the mod that moved this.

[Adger Smith]

Looks like the 327 275 has been gifted with HP. (NHRA.com) The 1966 275 is now at 299 HP with OE heads & 304 HP w replacement heads. The 327 300 HP is at 285 w OE heads & 290 W Replacement heads. Might make the 300 a better choice, depending on the differences in the engine combos. If you know the shipping weight of the heavy car you want to use you can use Bill's GT calculator to figure out what classes it will fit. You have to know 3 things to figure the class w/GT calculator. 1. Shipping weight of the car you want to use. You can get the factory shipping weight from the NHRA classification guide. http://www.nhra.com/tech_specs/classification/ 2. The factored HP of the engine. (get the same place) 3. Either Auto or Man. The program works. It even gives you choices of which classes you can move to by adding or subtracting weight & the HP required to run. Pretty nice tool.

[Eric Merryfield]

Originally Posted by Chris DeGidio

How do you figure class for a certain engine/car combo?? Combo in question would be a 71 Plymouth Duster with a 1970 383/335Hp engine.

Chris,

I don't think you can the 383 in GT since it doesn't have a rating for GT, just superstock. The 340, and 340 six pack has ratings. Also 340's from other years.

This may not help, but here is the 1970 dodge page from the classification guide. If you are able to run that motor, please let me know, it would truly open up a lot of options for other Mopar racers.


DODGE 1970

198 225 225 318 318 340 340 340 340 340 383 383 383 383 383
* ** * ** * ** * * ** * ** * **
A A
Auto Stick
125hp 145hp 145hp 230hp 230hp 275hp 275hp 290hp 290hp 290hp 290hp 330hp 330hp 335hp 335hp
DART 111
Sedan 4 Dr 22.40 20.74 19.31 15.62 14.81
Sedan 2 Dr Swinger 22.36 20.70 19.27 15.59 14.79 10.48 11.15
Sedan 2 Dr Custom 22.28 20.62 19.20 15.54 14.74
Sedan 4 Dr Custom 22.40 20.74 19.31 15.62 14.81
CHALLENGER 110
Sedan 2 Dr Hdtp 22.04 20.52 16.08 15.25 10.51 11.18 10.93 10.90 10.72 10.72 10.72
Sedan 2 Dr TA 9.59 9.83 9.53
Convertible 22.89 21.31 16.70 15.84 10.89 11.59 11.12 11.29 11.11 11.11 11.11
Coupe 2 Dr Hdtp 22.12 20.59 16.14 15.31 10.54 11.21 10.96 10.94 10.76 10.76 10.76
CORONET DELUXE 117
Coupe 2 Dr 22.89 21.31 17.24 16.36 11.55 11.53 11.33 11.33 11.33
Sedan 4 Dr 23.11 21.52 17.41 16.51 11.65 11.63 11.44 11.44 11.44
Sta Wag 2S 26.56 24.73 19.73 18.72 13.26 13.21 12.99 12.99 12.99
CORONET 440 117
Coupe 2 Dr 22.96 21.38 17.29 16.41 11.58 11.56 11.37 11.37 11.37
Sedan 2 Dr Hdtp 23.15 21.55 17.43 16.54 11.67 11.64 11.45 11.45 11.45
Sedan 4 Dr 23.19 21.59 17.46 16.56 11.69 11.66 11.47 11.47 11.47
Sta Wag 2S 26.61 24.77 19.77 18.75 13.28 13.22 13.00 13.00 13.00
Sta Wag 3S 27.12 25.25 20.14 19.11 13.52 13.46 13.24 13.24 13.24
CORONET 500 117
Sedan 2 Dr Hdtp 17.32 16.43 11.60 11.57 11.38 11.38 11.38
Convertible 18.05 17.13 12.05 12.03 11.83 11.83 11.83
Sedan 4 Dr 17.53 16.63 11.74 11.71 11.51 11.51 11.51
Sta Wag 2S 19.64 18.64 13.08 13.04 12.82 12.82 12.82
Sta Wag 3S 19.89 18.87 13.31 13.25 13.03 13.03 13.03
CHARGER 117
Sedan 2 Dr Hdtp 24.04 22.38 17.96 17.04 12.01 11.98 11.78
Sedan 2 Dr Hdtp 500 24.04 22.38 17.96 17.04 12.01 11.98 11.78

S/SS Factor 125 135 145 185 195 299 281 328 320 330 290 295 300 300 300
6.28.05 6.28.05 8.26.03 1.1.07 7.8.04 2.13.06 6.2.03 5.30.02 6.2.03 5.30.02
GT Factors 288

SS Factor w/replacement heads 286 335
10.27.07 10.27.07
GT Factor w/replacement heads 293 335
10.27.07 10.27.07





A - P5007140 replacement head for SS only


* = Stock Factor

[Bill Harris]

Eric, this is untrue. You can run the 383 in a SS/GT class. You would use the same SS factor as defined for a non-GT. The only time there is an entry in the classification guide specifically for GT is when the AHFS has made an adjustment on a particular engine when it is used in a GT application. The more popular engines used in GT classes are more likely to have a GT specific factor, but only because there has been more opportunity to get hit. All of them started out as regular SS factors and have been enhanced sometime in the past.

[Eric Merryfield]

Originally Posted by Bill Harris

Eric, this is untrue. You can run the 383 in a SS/GT class. You would use the same SS factor as defined for a non-GT. The only time there is an entry in the classification guide specifically for GT is when the AHFS has made an adjustment on a particular engine when it is used in a GT application. The more popular engines used in GT classes are more likely to have a GT specific factor, but only because there has been more opportunity to get hit. All of them started out as regular SS factors and have been enhanced sometime in the past.

Bill,

Thank You for setting me straight. This is great news! Opens up a lot of interesting options for future fun..

Eric

[Paul Sarvas]

Originally Posted by Bill Harris

If you have Microsoft Excel you can use my class calcuator to find out which classes a particular setup can run. You need to know the shipping weight of the car, the factored HP of the engine, and the trans type.

You can download or run from:
http://www.employees.org/~bhracing/g...ulator_1p1.xls

Would it be possible to repost this as a working link please?

Thank you,

pS