DMS Time Trials Rulebook (2026)
Race the Clock. Edmonton’s Grassroots Autocross & Track Sprint Series.
Welcome to DMS Time Trials! Our goal is to provide a safe, fun, and fair place to race your street car while growing Edmonton’s grassroots motorsports community.
DMS uses a simple Weight-to-Horsepower (WT:HP) classing system combined with modification points to keep competition balanced and approachable — even if this is your first motorsport event.
The 3 Most Important Rules
-
Base Class: Find your base class using WT:HP (factory curb weight (lbs) ÷ factory horsepower).
-
Mod Points: Add together points based on modifications (only once per category).
-
Class Bump: Your total points determine if you stay in your class or move up.
Beginner note: If you misclass your car, we will help you fix it. No penalties for honest mistakes. If you’re unsure at any point, ask before the event — we want this to be easy.
Table of Contents
1. Overview
2. Class Breakdown
3. Modification Points
3.1 Tire Rules
4. Class Points Allowance
5. How to Find Your Class
6. Classing Example
7. Event Format
8. Start Procedures
9. Seasonal Points & Standings
10. Driver Declaration & Fairness
11. Safety & Technical Requirements
12. Exhibition Class
13. If You’re Not Sure
14. Questions & Updates
1. Overview
DMS Time Trials is designed for street cars and all experience levels. The focus is:
-
Local + beginner-friendly
-
Simple rules
-
Maximum fun
-
Fair competition without over-complication
2. Class Breakdown
Your base class is determined by your car’s Weight-to-Horsepower (WT:HP) ratio:
WT:HP = factory curb weight (lbs) ÷ factory-rated horsepower
Data source
OEM manufacturer data is the primary source and must match the model year, trim, and transmission. If unavailable, data from reputable, independent reviews (Car & Driver, Edmunds, MotorTrend original road tests) may be used.
Engine swaps
Vehicles with engine swaps use the donor engine’s OEM crank horsepower.
Kit cars
Use the vehicle’s measured weight (no driver) and the factory-rated horsepower of the engine.
Base Classes (WT:HP)
Class WT:HP Ratio Description
Daily 15.00+ Base models/economy cars
Sport 12.00–14.99 Sport trims/mild performance cars
Tuner 9.00–11.99 High-performance/hot hatches
Performance <9.00 High-power/modified cars
3. Modification Points
Each category adds points only once, regardless of quantity installed.
Category
Basic Power Mods
High Flow Exhuast(Turbo Cars)
Major Power Adders
Suspension
Track Aero
Major Weight Reduction
Performance Tires
Extra-Wide Tires or Rims
Points
+1
+1
+2
+2
+1
+2
+3
+1
Description
NA: Requires a tune AND 3+ airflow bolt-ons (intake, header, cam, catback, etc). Turbo/SC: Any aftermarket tune.
Downpipe or catless exhaust on turbo vehicles
Added turbo/SC to NA engine, upgraded turbo, performance head swaps, stroker kits, or any displacement increase
Coilovers OR 3+ suspension components
Large splitter or large wing intended for real downforce
100+ lbs removed (net)
Any tire 100TW–199TW, or any tire on the Super 200 list
Tires +40mm or rims +2” over widest OEM option
*Important:
Intake, exhaust, or other engine bolt-ons by themselves do NOT add points unless the car is tuned.
Clarifications:
Suspension components (what counts)
-
Springs (full set) = 1 component total
-
Shocks/struts (full set) = 1 component total
-
Sway bars front, rear or both = 1 component total
-
Coil overs = 3 component total
-
Camber-increasing parts or modifications = 1 component total
-
OEM replacement parts do not count
Tune definition
A tune = ECU reflash, ECU replacement, piggyback, or software altering ignition, fuel, cam timing, or boost tables.
Manual timing adjustments or carburetor tuning does not count.
Track aero (what counts)
Track aero means large, reinforced, or adjustable wings/splitters intended for real downforce.
Cosmetic aero does not count. If it doesn’t stick out more than 5" from the body, it’s not track aero.
Major weight reduction (net weight)
Only applies when more than 100 lbs of net weight is removed. If weight removed is replaced by other components (e.g., gutted interior but a full cage adds it back), it does not count.
Widest OEM option
Refers to the widest tire/wheel width offered from the factory for that model—not a higher-trim model outside your class WT:HP. Example: A Civic Sport (Daily) cannot use Civic Type R (Tuner) OEM width reference.
Brakes
Upgraded brake pads, rotors, and big brake kits are considered safety items and are not penalized.
Definitions
-
NA (Naturally Aspirated): No turbo or supercharger
-
Turbo/SC: Turbocharged or supercharged (factory or added)
-
Treadwear (TW): Tire grip rating — lower number = more grip. The number is stamped on the tire sidewall and can also be found online.
3.1 Tire Rules
Simple rule: If your tire is 100TW or higher and street legal, it is allowed.
Some high-grip 100TW - 300TW tires cost +3 points.
-
All tires under 100TW = Exhibition Class only
-
The +3 points for Performance Tires applies to:
-
All tires 100TW–199TW
-
All tires on the Super 200 list
-
Super 200 Tires include:
RE71RS, Potenza Race, A052, RT660, V730, CRS, SC3, P1, V-01R, Rival S, Rival +, Cup 2, Sport R, VR2, ECF, TAP.
Note:
Any new 200TW+ performance tire that receives a B, B+, or higher time-trial rating from Grassroots Motorsports will be added. Tires rated B- will be reviewed. Tires rated C or lower will not be added. Tires rated higher than AA will be placed in Exhibition regardless of TW rating.
4. Bump Rules / Class Points Allowance
Think of points as “class pressure” — more points moves you up until competition is fair.
-
4+ points → Move up 1 class
-
8+ points → Move up 2 classes
-
12+ points → Move up 3 classes
Performance is the highest competitive class. You cannot be bumped higher than Performance.
5. How to Find Your Class (Step-by-Step)
-
Find factory curb weight (lbs)
-
Find factory horsepower (crank HP)
-
Calculate WT:HP (Weight ÷ HP)
-
Determine your base class (Section 2)
-
Add modification points (Section 3)
-
Apply the bump rules (Section 4)
-
Done (maximum competitive class is Performance)
6. Classing Example
Car: 2015 Subaru WRX
Mods: Coilovers, cat-back, intake, tune, RE71RS tires
1. Curb Weight: 3,267 lbs
2. Horsepower: 268
3. WT:HP: 12.19
4. Base Class: Sport
5. Mod Points:
-
Suspension (coilovers): +2
-
Basic power mods (tune): +1
-
Performance tires: +3
Total = 6 points
6. Bump rule: 6 points = 4+ points, so move up 1 class
7. Final Class: Tuner
7. Event Format
-
Up to 8 timed runs per regular event
-
10 timed runs at the season finale (StratoCup)
-
Your best clean run counts
-
Drivers get a practice session before timed runs
-
Practice runs are untimed and optional and taken at speeds under 60km/h
Penalties:
-
Cone hit = +2 seconds
-
Dropping 2+ tires off pavement OR going off-course = DNF (run invalid)
Reruns given when:
-
Driver catches up to another car
-
Timing issue
-
A cone is knocked over, and the driver slows down and honks their horn.
8. Start Procedures
To minimize launch advantages between drivetrains:
Autocross:
-
Standing start → short acceleration zone
-
Timing starts 5–10 ft before first element
Track Sprint:
-
Standing start → 100–150 ft acceleration zone
-
Timing starts after the acceleration zone
9. Seasonal Points & Standings
Season points exist to reward those that consistently place well at the events
-
Points awarded by class finishing position using a descending scale
-
(1st = 10 points, decreasing by one per position)
-
A driver’s worst two regular-season results are dropped
-
The season finale (StratoCup) carries 1.5x points and cannot be dropped
-
Ties will be settled by most wins, then by podium finishes
10. Driver Declaration & Fairness
Drivers must accurately declare weight, horsepower, tires, and modifications.
If something is unclear, ask — we would rather help you class correctly than penalize mistakes.
Intentional misrepresentation may result in disqualification.
11. Safety & Technical Requirements
Bottom line: If your car is safe for spirited street driving, it will likely pass tech.
Minimum requirements:
-
Vehicle must be mechanically sound
-
No fluid leaks
-
Battery secured
-
No cords showing on tires
-
Remove all loose interior items (phones, water bottles, tools, etc.)
-
Vehicle must be wider than tall
-
Large trucks, SUVs, and vans are not allowed
-
Helmets required: Snell M/K/SA 2010+ or ECE 22.05/22.06
-
Max noise: 94 dBA @ 100 ft
-
Drivers must have a valid driver’s license
-
Drivers must complete annual online waiver and self-tech
-
Passengers must complete waiver and be 14+
Organizers may perform safety spot-checks and may disqualify any vehicle deemed unsafe.
12. Exhibition Class
Exhibition Class is for:
-
Non-street vehicles
-
Slick-equipped cars (under 100TW)
No awards or seasonal points are given for Exhibition.
13. If You’re Not Sure
If you’re unsure how to class your car, contact us before the event. We will help you class it correctly — no penalties for honest mistakes
14. Questions & Updates
If you’re confused about classing or any rule, ask anytime.