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2016 Rule/Tech Updates:

The 2016 WISSOTA Rule Book is available online here. All rules for Late Models, Modifieds, Super Stock, Midwest Modifieds, Street Stocks, Mod Fours, Pure Stocks and Hornets are included in the rule book.

Pure Stock and Hornet license fees were inadvertently left out of the 2016 rule book. A full license for each class is $50 (no temp licenses for these classes). You can find a license application form under the “Drivers” tab on this website; that form must be filled out completely and legibly, and should be mailed or faxed to the WISSOTA office. Or, if you prefer, you can use the online registration option, which is also located under the “Drivers” tab in the main menu of this website.

Any rule updates or clarifications needed during 2016 will be posted here and also published in All The Dirt! Racing News. If you have any questions pertaining to any car rules, contact: Bill Engelstad at (218) 262-5823 or (218) 208-7844, or bill@wissota.org.

Multi Class Rules:

1-7-16
No updates have been posted at this time.

Late Model Rules:

2-16-16
Concept engine crankshafts must have a minimum weight as follows: Chevrolet 45 lbs., Ford 42 lbs, Mopar TBA.

3-2-16
Late Model Suspension rules being added:

4. Shocks and Springs

A) Shocks must be constructed of aluminum or steel. Canister shocks are permitted.

1. The only external connection allowed to the shock is a single hose to a single remote canister with the option of a compression adjuster in the canister.
2. Compression adjuster and/or canister cannot be mounted within the reach of the driver.

B) No cross connected shocks are allowed.

1. The only external connection allowed to the damper is a single hose to a single remote canister with the option of a compression adjuster in the canister.
2. Compression adjuster and/or canister cannot be mounted within the reach of the driver.

C) No “Rod­ Through” designs are allowed.

1. “Rod­ Through” shocks are defined as those shock absorbers in which the piston rod protrudes from both ends of the shock body.

D) No Inerters are allowed.

1. No rotating parts inside the damper.
2. No Inerter style dampers, either mechanical or hydraulic, or other type of primarily acceleration sensitive damping devices not permitted.

E.) No Electrical adjusted or active dampers are allowed. No electrical wires, transmitting or receiving components will be allowed to be attached internally or externally to the dampers or mounted inside any component or dampers. No portion of the racecar including and not limited to ­ shocks and spring components or chassis components may have the ability to communicate transfer/transmit/receive any type of digital or analog data or any language and or adjust or monitor in any way whatsoever including but not limited to a variation of a wireless remote device/phone/computer/tablet/ipad or a mechanical remote device.

F.) Any new chassis design or component designs pertaining to and/or but not limited to shock absorber mounts must be submitted to WISSOTA for approval before they will be permitted for use in competition. Manufacturer and/or competitor may be required to disassemble for complete inspection before in­statement of new part is permitted.

G.) Springs must be made of steel. Torsion bars are not allowed in rear.

H.) Coil springs must be steel. Leaf springs may be composite or steel.

I.) Shock Locations

1.    Only one shock per wheel is permitted at the left front, right front, right rear corners.

2.    Left rear must have one shock behind the axle tube and may have one traction (dummy) shock on the front side or top of axle tube. Must mount vertically to the birdcage or clamp bracket .

3.    One 5th Coil Shock permitted.

4.    One 90/10 optional shock may be mounted above lift arm on upper lift arm plates. Must be mounted towards the front of the car lying parallel with the car. Shock must mount within 3” of the centerline of the rear ends center section.

J.) Drop Chain (limiting chain) is permitted. Must mount vertically between frame and a clamp bracket.

K.) Bump stops and/or bump springs are permitted.

L.) Suspension covers are not allowed. Rear covers on racecar are not allowed outside of your pit area. Spring and/or shock covers are permitted, but must be fastened directly to the spring or shock.

M.) A Swing Arm and/or Z Link suspension is permitted as long as the Top and Bottom solid links are mounted on hiems and run in the opposite directions of the bird cage. The Shock on a Swing Arm or Z Link rear suspension may mount to the bird cage or the bottom radius rod.

Late Model Suspension Components:

A.) Any new chassis design or component design and or technology pertaining to and/or containing suspension must be submitted to WISSOTA for approval before they will be permitted for use in competition. Manufacturer and/or competitor may be required to disassemble for complete inspection before instatement of new part is permitted.

B.) Suspension and/or rear end parts can be made of steel or aluminum. Aluminum mounting brackets are permitted.

C.) Frame and/or suspension mounts must be welded or bolted solid to the frame and not move. ie­ Floating, sliding, pivoting and/or rotating mounts and/or brackets of any sort are not allowed.

D.) Bolted components must match the correct bolt size with the hole (for instance no 3/8 bolts in a 1/2 inch hole will be deemed illegal) and be torqued to a min of 40 foot pounds per inch.

E.) Rear Suspension Mounts.

1.    Single sheer mounts must be 1/4” minimum steel and/or 1/2” minimum aluminum.

2.    Double sheer mounts must be 1/8” minimum steel and/or 1/4” minimum aluminum.

3.    Sheer mounts must use minimum 5/8” rod ends with minimum 1/2” grade 8 bolts only.

4.    Double sheer mount must be no wider than 4 inches with a minimum 1/2” inch grade 8 bolt with steel or aluminum spacers only.

F.) Only one (1) mechanical traction device is permitted. Only one (1) pull bar or one (1) lift arm is permitted. No other options are allowed. Covers of any sort in any relation to the lift arm or pull bar are not allowed.

G.) Lift Arm & Pull Bar

1.    Floating, pivoting and/or rotating mounts and/or brackets of any sort (connected to and/or associated with the pull bar or lift arm) are not allowed.

2.    Lift arm is defined as a steel or aluminum triangulated bar that is connected at the top and bottom of the rear end housing, extending forward where it is connected to a shock, shock­spring coil­over combination and a limiting chain. One stabilizer bar is permitted to locate the front of the lift arm from left to right in the car.

3.    6th coil or braking spring assemblies are permitted, must be in front of 5th coil shock.

4.    Pull bar is defined as a continuous assembly that is connected to the top of the rear end and
extends forward to a solid mounting point located on the chassis. The mounting location at both the front and rear of the pull bar may be adjustable but must remain constant during competition (cannot be adjustable from the cockpit).

H.) Radius Rods

1.    All rear suspension radius rods must be of a fixed length. No hydraulic cylinders, torsion bars, bump rods, spring rods, slider rods or shock­type radius rods are permitted.

2.    Radius Rods must be a minimum of 1” aluminum diameter OD or 7/8″ steel OD. Rods can be round, square, or hex shaped. Rods must be a minimum of .095 steel or .120 aluminum in tubing thickness.

3.    Heim joints must be a minimum 5/8, and a maximum 3/4” steel heim. No rubber bushings.

4.    ONLY ­ Two (2) radius rods per side.

a.    Radius rods must be spaced on the frame a minimum of 6”

b.    Radius rods must be spaced on the birdcage a minimum of 6” and a maximum of 12”

c.    Measurements will be made from center of each radius rod bolt.

I.) Birdcages

1. Birdcages may consist of multiple barrels but must bolt or weld together to work as single barrel birdcage.

2.    Limited one birdcage (1) per side.

3.    Shock(s) and radius rods must mount to the birdcage.

4.    Floating, pivoting and/or rotating mounts and/or brackets of any sort are not allowed. All brackets or mounts attached to the birdcage must be bolted or welded solid.

Modified Rules:

2-3-16
Modified drivers are reminded that the roll cage/main cage rule requires a minimum of 1.66 O.D. tubing. Please make sure your car meets this minimum specification. Some chassis builders offer smaller diameter tubing which does not meet the WISSOTA rule. This is a reminder only, not a change. This has been the rule for WISSOTA Modifieds and continues to be.

2-4-16
Lightened crankshafts are not allowed in WISSOTA Modified Concept Engines. A crankshaft weight rule for the WISSOTA Modified Concept Engine is being finalized and will be announced shortly.

2-16-16
Minimum of 16 vane brake rotors allowed on the rear brakes only.  All rear brake rotors must weigh a minimum of 6.5 pounds.

2-16-16
Concept engine crankshafts must have a minimum weight as follows: Chevrolet 45 lbs., Ford 42 lbs, Mopar TBA.

3-8-16

Following is a Modified suspension update (brake components are NOT included in this update):

Shocks & Springs

1. No cross connected shocks are allowed.

2. Any new chassis design or component designs pertaining to and / or but not limited to shock absorber mounts must be submitted to WISSOTA for approval before they will be permitted for use in competition. Manufacturer and / or competitor may be required to disassemble for complete inspection before instatement of the  new part is permitted.

3. Shocks must mount vertically to the birdcage or clamp bracket.

4. Drop chain ( limiting chain ) is permitted. Must mount vertically between frame and clamp bracket.

5. Bump stops are allowed. ( no bump springs ).

6. A swing arm and / or Z link suspension is permitted as long as the top and bottom solid links are mounted on hiems and run in the opposite directions of the bird cage. The shock on a swing arm or Z link rear suspension may mount to the bird cage or the bottom radius rod.

Suspension Components

1. Any new chassis design or component design and or technology pertaining to and / or containing suspension must be submitted to WISSOTA for approval before they will be permitted for use in competition.

2. Frame and / or suspension mounts must be welded or bolted solid to the frame and not move. ie Floating, pivoting and / or rotating mounts and / or brackets of any sort are not allowed.

3. Bolted components must match the correct bolt size with the hole.

Radius Rods

1. Radius rods must be minimum of 7/8″ diameter O.D. Rods can be round, square, or hex shaped. Rods must be minimum of .095 steel.

2. Heim joints must be minimum 5/8 and maximum of 3/4 steel heim. No rubber bushings.

3. Only 2 two radius rods per side.

4. Radius rods must be spaced on the frame a minimum of 6″.

5. Radius rods must be spaced on the bird cage a minimum of 6″ and a maximum of 12″

6. Measurements will be made from center of each radius rod bolt.

Birdcages

1. Birdcages may consist of multiple barrels but must bolt or weld together to work as one single barrel birdcage.

2. Limited to one ( 1 ) bird cage per side.

3. Shock(s) and radius rods must mount to the birdcage.

4. Floating, pivoting and / or rotating mounts and / or brackets of any sort are not allowed. All brackets or mounts attached to the birdcage must be bolted or welded solid.

4-19-16

REMINDER: There can only be one spring per wheel. One additional spring is permitted in the center of the car pertaining to the traction device (example: spring on pull bar or lift arm). This is in line with the other sanctioning bodies’ rules.

Super Stock Rules:

2-16-16
Minimum of 16 vane brake rotors allowed on the rear brakes only.  All rear brake rotors must weigh a minimum of 6.5 pounds.

Midwest Modified Rules:

2-3-16
Midwest Modified drivers are reminded that the roll cage/main cage rule requires a minimum of 1.66 O.D. tubing. Please make sure your car meets this minimum specification. Some chassis builders offer smaller diameter tubing which does not meet the WISSOTA rule. This is a reminder only, not a change. This has been the rule for WISSOTA Modifieds and continues to be.

2-16-16
Minimum of 16 vane brake rotors allowed on the rear brakes only.  All rear brake rotors must weigh a minimum of 6.5 pounds.

4-19-16

REMINDER:  Top link must run visually perpendicular to the rear end housing. This is in line with other sanctioning bodies’ rules. This does not change the mounting point rule on the rearend housing.

Street Stock Rules:

2-16-16
Reminder: Firewall and floor pan must be stock and in stock location for frame being used.

2-16-16
Minimum of 16 vane brake rotors allowed on the rear brakes only.  All rear brake rotors must weigh a minimum of 6.5 pounds.

Mod Four Rules:
1-7-16
No updates have beenposted at this time.

Pure Stock Rules:
3-15-16
Transponders: Must mount transponder on the right side, inside the frame, approximately 21- 23 inches behind lower ball joint.

3-24-16
Transmission cooler allowed. Cooler or cooler lines can not be in drivers compartment.

Hornet Rules:
3-15-16
Transponders: Transponder must mount approximately 34 inches behind center of lower ball joint on the right hand side of car. Cut a hole in the floor pan and bolt or weld a mount to the top side of the floor pan and mount transponder to it. Make sure there is no obstruction between transponder beam and ground.