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Calculator 2.0
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Rules and Forms
Calculator 2.0
Classing Calculator
Northeast GT Cup | Class Calculator 2.0
Welcome to the NEGT Cup calculator.
If you are interested in the power-to-weight based GT Cup (GTC), please fill this out. If you plan to run GT Bracket (GTB), there is no need to click send, but feel free to explore.
Use this tool to see your adjusted GTC power-to-weight ratio, which class your car falls into currently and your minimum competition weight for that class.
Intake-restricted cars will be reviewed for GTC on a case-by-case basis and are always welcome as-is in GT Bracket (GTB). Cars detuned electronically are suggested to run in the GTB category as well, as they would be classed in GTC using their full OEM rated power, torque and all relevant modifiers.
Please reach out to us with any issues or questions.
-NEGT Staff
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Driver / Owner
Team Name
*
Last Name
*
First Name
*
Email
*
General Car Info
Earliest Chassis Model Year
*
SELECT
Pre 1980
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
Post 2020
[-0.25%] per year before 2000, [+0.25%] per year after 2000
Chassis Make
*
Chassis Model
*
Factory Rated Horsepower
*
Top rated variant of the long block, regardless of year of manufacture or model in which it was delivered
Factory Rated Torque
*
Top rated variant of the long block, regardless of year of manufacture or model in which it was delivered
Weight (lbs)
*
As raced, with driver, any ballast and full of fuel
Hidden
Car Number
*
Number of Restrictors / Openings (copy)
*
Type of Inlet Restrictor
*
None
Flat Plate
SIR - Single Inlet Restrictor
Are you currently running any air inlet restrictors or restrictor plates? (copy)
*
Yes
No
Size of Restrictor Opening (mm) (copy)
*
Note that the calculator does not currently take your restrictor size into account. Right now, this is just for data gathering purposes.
Engine
Model / Designation
*
Engine Make
(If different than car)
Dry Sump Oiling System?
No = [+0%]
Yes = [+5%]
Changes to Head, Cam, Engine Size or Compression Ratio?
Yes
No
Compression Modified?
Yes
+4% per point increase
Factory Compression
Current Compression
Displacement Modified?
Yes
+1% per % displacement increase
Factory Displacement
*
Current Displacement
*
Cylinder Head
OEM to engine (including port match) = [+0%]
OEM to engine (including port match) = [+0%]
OEM swap (same type/config) or ported cylinder head = [+15%]
OEM swap (change type/config) or aftermarket cylinder head = [+25%]
Camshaft
OEM to engine = [+0%]
OEM to engine = [+0%]
Change rocker / follower ratio = [+5%]
OEM sourced cam swap = [+15%]
Modify cam or aftermarket cam = [+25%]
Throttle Body
Stock = [+0%]
Stock = [+0%]
Updated replacement, modified or aftermarket = [+2.5%]
Intake Manifold
Stock = [+0%]
Stock = [+0%]
Updated replacement, modified or aftermarket = [+2.5%]
Exhaust Manifold / Header
Stock = [+0%]
Stock = [+0%]
Modify OEM, replace w/ OEM swap or aftermarket of same type = [+2.5%]
Manifold replaced with tubular header = [+5%]
Chassis & Drivetrain
Engine Location
Front = [+0%]
Front = [+0%]
Mid (rear-mid only) = [+3%]
Rear = [+2%]
Transmission
*
SELECT
Auto w/ 5 or less speeds = [-5%]
H-pattern manual, 6spd auto or SMG (single clutch auto/manual) = [+0%]
Sequential, 7+ spd auto, dual clutch (PDK, DCT, etc.) = [+7.5%]
Differential
*
SELECT
Open = [-2.5%]
LSD (any type, including E-Diff) = [+0%]
Driven Wheels
*
SELECT
FWD = [-3%]
RWD = [+0%]
AWD = [+0%]
Front Suspension Design
*
SELECT
Strut = [+0%]
Double A-arm = [+1.5%]
Other = [+1.5%]
Rear Suspension Design
*
SELECT
Solid axle = [-1.5%]
Beam, cambered solid axle = [-0.5%]
Strut = [+0%]
Trailing arm, semi-trailing arm = [+0.75%]
Double A-arm, multi-link = [+1.5%]
Tires
Not every tire is called out by name. If you don't see your tire, choose the category where you see similar tires and make sure to inform us what tire you are running in the comments section below.
Average advertised tire width: +/-1% per 10mm more / less than 245mm. (-2.5% modifier limit)
Tire Category
*
SELECT
Hard: 200tw Endurance (RS4, ECF, etc.), NT01, RA1, 888R, 200+ tw = [-8%]
Medium: 200tw Sport (V730, 660, ZIII, etc.), most 100tw, Toyo RR, MPSC2 = [+0%]
Soft: 200tw Super (CRS, RE, AO, etc.), Toyo R, SC3R, Trofeo R = [+8%]
Super Soft: R Comp DOT (R7, RCES, GYRS, etc.) = [+18%]
Front Tire Labeled Width
*
SELECT
195
205
215
225
235
245
255
265
275
285
295
305
315
325
335
345
355
Rear Tire Labeled Width
*
SELECT
195
205
215
225
235
245
255
265
275
285
295
305
315
325
335
345
355
Brakes
ABS
*
SELECT
Non-ABS / ABS disabled / removed = [-2%]
Stock ABS = [+0%]
MK60, Ford Racing or OEM-based swap = [+2%]
Race / Tuned / Adjustable / Programmable = [+4%]
Brake Caliper
*
SELECT
1 = [-1%]
2 = [+0%]
4 or more = [+1%]
Largest individual caliper piston count
Brake Rotor Diameter
Stock = [+0%]
Stock = [+0%]
Larger than stock = [+1%]
Suspension
Shocks
*
SELECT
Non-adjustable = [-1%]
Single adjustment = [+0%]
Double adjustment = [+1%]
Double adjustment w/ external reservoir = [+2%]
Three or more adjustments = [+3%]
Select the highest level on car.
Suspension Components
More than one non-OEM link/arm per any corner (do not count camber plates) = [+3%]
Relocated mounting point(s), non-OEM knuckle / upright geometry = [+3%]
Spherical / solid bushings not in a free or paid for part = [+1%]
Select all that apply. Free items that do not apply: OEM-style sway bars, sway bar drop links, toe links, other toe adjustment-only items, reinforcements and bump steer correction that serve no other purpose. Purpose built or non-production GT style racecars shall take both of these 3% adders.
Aero
Aero Level
*
SELECT
OEM = [-2%]
OEM Plus: small changes or additions such as: hood vents, fender vents, air dam, aftermarket bumper, canards = [+0%]
Club: wing (element up to 10" chord & body width), splitter (up to 4"), diffuser (within 2" of bodywork & up to 6" tall) = [+5%]
Extreme: large or multi-element wing, large splitter (>4"), large diffuser (>2" past bodywork or >6" tall), active aero = [+10%]
Select highest level that applies.
Supporting Aero
Any of the following: splitter fences, side skirts, flat bottom, ducted hood vent, tilted radiator, large wing end plates or other added aero panels (over 72 in²) = [+2%]
Select if equipped.
Body
Change roofline / A-pillar / C-pillar, etc. = [+2%]
Remove roofline / A-pillar, etc. = [+3%]
Widebody / change more than body panels = [+2%]
Select all that apply.
X Factor
*
SELECT
+0%
+1%
+2%
+3%
+4%
+5%
+6%
+7%
+8%
+9%
+10%
+11%
+12%
+13%
+14%
+15%
+16%
+17%
+18%
+19%
+20%
+21%
+22%
+23%
+24%
+25%
X Factor, for mods outside the ruleset.
displacement penalty (%)
PM18
Adj Power 18
valFinalFactoryPower
PM 14
Adj Power 14
compressionPrice
PM 11
Adj Power 11
valTotalPenaltyPrice
$0.00
PM 9
Adj Power 9
Conclusion
Northeast GT features four official GT Cup classes: GT9, GT11, GT14, and GT18. The # in each class name represents GTC Class Cutoff Ratio for that class. For example, the cutoff or most powerful ratio for GT14 is 14:1. The lower the number, the higher the overall performance level of the car.
Your adjusted GT Cup Ratio:
Your GTC class is GT18 with this minimum competition weight:
Your GTC class is GT14 with this minimum competition weight:
Your GTC class is GT11 with this minimum competition weight:
Your GTC class is GT9 with this minimum competition weight:
Your GTC class would be GT9 with this minimum weight,
but your adjusted GTC ratio is currently too low.
Your car is too light, too powerful or has too many trick parts. Selecting a slower tire category or adding to your car's weight are the quickest adjustments to try to fit the class. You are also welcome to join us in our GT Bracket category.
I'm interested in:
*
GT18
GT14
GT11
GT9
Comments:
*
Please provide any feedback as well as include any relevant info such as current series you run in, what class your car is in, peak dyno numbers if you have them and anything unique about your car, including if running an inlet restrictor and related details. Thank you!
Your Competition Weight For Each Class
Minimum weight of car, including driver, as raced, post race, per class based on the information entered above.
This will help you see how your car may fit into the next class up.
GT18
GT14
GT11
GT9
Submit form to Northeast GT
Jump to Series Info
New England, United States
race@northeast-gt.com
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