GT class configuration...

[Dwight Southerland]

To calculate GT combinations:

1) Go to www.classracerinfo.com
2) Register as a member if you have not done it already
3) Go to link for Technical Tools
4) Select NHRA Classification Tool

5) Select your car year-model (1971 Plymouth, 1987 Camaro, etc) from the drop down boxes

6) Click on the specific make-model-engine combination from the classification page (looks like an NHRA class guide page)

7) You will see Stock-Super Stock classfication information. At the bottom of that classification information page is a button titled "GT Classes". Click on it.

8) Select the engine you want to use from the list that is displayed and click on the button "Classify"

9) Ta-dah! All the GT classifications with weights, classes and indexes for each eligible classes.

[jmcarter]

Dwight, you've been commended on other threads for this great tool and in my futile attempt to find a traditional SS car within my budget I have started to get more serious about making it a GT class car in order to use some of my inventory. The tool you created is absolutely phenomenal in terms of time savings for the racer looking to find a good competitive GT combo. Thanks!!!

[Dwight Southerland]

Gee thanks, Jim! I'm humbled by the complement.

[Sean Marconette]

Originally Posted by jmcarter

Dwight, you've been commended on other threads for this great tool and in my futile attempt to find a traditional SS car within my budget I have started to get more serious about making it a GT class car in order to use some of my inventory. The tool you created is absolutely phenomenal in terms of time savings for the racer looking to find a good competitive GT combo. Thanks!!!

I agree, thank you for this tool.

Sean

[Mark Yacavone]

Originally Posted by Dwight Southerland

To calculate GT combinations:

1) Go to www.classracerinfo.com
2) Register as a member if you have not done it already
3) Go to link for Technical Tools
4) Select NHRA Classification Tool

5) Select your car year-model (1971 Plymouth, 1987 Camaro, etc) from the drop down boxes

6) Click on the specific make-model-engine combination from the classification page (looks like an NHRA class guide page)

7) You will see Stock-Super Stock classfication information. At the bottom of that classification information page is a button titled "GT Classes". Click on it.

8) Select the engine you want to use from the list that is displayed and click on the button "Classify"

9) Ta-dah! All the GT classifications with weights, classes and indexes for each eligible classes.

Does anyone see a button for GT Classes? I don't. I have emailed Dwight.

[Rusty Gillis]

Dwight this is a great tool and maybe I'm missing something but what if you have a replacement head and NHRA has added hp how do you look that up?

[Mark Yacavone]

Originally Posted by Mark Yacavone

Does anyone see a button for GT Classes? I don't. I have emailed Dwight.

Okay I see it now. You have to click on the specific p/w factor for the body style and engine to be used, the negotiate from there.

I see , for instance a 66 Chevy II, 2 dr sedan with a 283 , can run three classes in SS, but five classes in GT. Then if the hp rating is lower in GT, you can get back to the weight break where you were in SS , at a lighter weight than when you left, with the same index.
Does this make any sense to anybody?
Also , seeing GT class was formed to allow a different year engine than the body you are using, would you have to claim the 283 as a 65 engine, or don't they care about that either?

[Sean Marconette]

Mark,
Where you need to pay attention is the min and max combo weight calculations in GT, as you are only allowed to be 250lbs above and below the natual class, at least that what I have found. It's a very helpful tool to play with what combo's could work, and what not to build! Dwight has really made looking at combos very easy.

Thanks Dwight!


Sean

[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.