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2015 Rule/Tech Updates:

The 2015 WISSOTA Rule Book is available online here. All rules for Late Models, Modifieds, Super Stock, Midwest Modifieds, Street Stocks and Mod Fours are included in the rule book.

Rules for the new WISSOTA Pure Stock and WISSOTA Hornet classes are also available for download:

2015 WISSOTA Pure Stock Rules
2015 WISSOTA Hornet Rules

Any updates or clarifications needed during 2015 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:

3-30-15
Tire needling is not allowed in any WISSOTA class after July 1, 2015. (After hearing concerns both pro and con on the tire needling issue and to allow time for drivers to use up any inventory of needled tires they may have, WISSOTA has made the decision that from July 1, 2015 forward, there will no needling of tires allowed in any class of  WISSOTA.)

3-31-15
Any new components pertaining to or containing shock absorber must be submitted to WISSOTA for approval before they will be allowed to enter into competition. Manufacturer or competitor may be required to disassemble for complete inspection before instatement of new part is permitted.

3-31-15
Conventional type (closed on one end) shock absorbers only. Single shaft shocks only.

3-31-15
Inerter shocks, J-Damper shocks, Active Mass Damper Shocks, Through-Rod Designed Shocks are not allowed.

3-31-15
Electronically controlled or monitored shocks by any means or methods are not allowed. Cockpit-adjustable shocks are not allowed. Driver cannot be able to adjust shocks while on the track during a race.

Late Model Rules:

6-23-15
You are not allowed to re-groove the cross hatches back into the Late Model tires. If driver is found doing this there may be up to a $1000.00 fine and 30 day suspension.

7-1-15
As of July 1, you can no longer run Hoosier 55 tires (as was outlined in the rule book).

Modified Rules:

12-18-14
Shown are the legal dimensions for the 1968 to 1972 Chevelle stub/frame. If your frame does not meet these measurements, please consult your chassis builder.

3-30-14
Ford 0-410 c.i. claimer engine is allowed 1.60 rocker arms.

3-31-15
All rear suspension radius rods, lift arms, panhard bars must be of fixed solid design. Absolutely no hydraulic cylinder, bump rods, spring rods, slider rods or shock type radius rods will be allowed to locate the rear end.

3-31-15
Fifth shock is only allowed in relation to pull bar or lift arm, (example 90/10 mounted inline with pull bar). This shock must run in the same direction as pull bar. Shock on lift arm must be mounted as referred to in the lift arm summary (WISSOTA 2015 rule book page 39, rule 4-A 7).

3-31-15
All factory holes must be present for inspection. All measurements must meet frame diagram tolerances listed or be within 1/2″ (either way) of OEM measurements on any measurement not listed on frame diagram – no additional tolerance.

Super Stock Rules:

12-16-14
No updates have been posted at this time.

Midwest Modified Rules:

12-18-14
Shown are the legal dimensions for the 1968 to 1972 Chevelle stub/frame. If your frame does not meet these measurements, please consult your chassis builder.

3-31-15
All factory holes must be present for inspection. All measurements must meet frame diagram tolerances listed or be within 1/2″ (either way) of OEM measurements on any measurement not listed on frame diagram – no additional tolerance.

Street Stock Rules:

4-2-15
WISSOTA Street Stocks drivers are allowed to cut a hole in the hood for the air cleaner. May have a hood scoop with maximum height of 3″.

Mod Four Rules:
12-16-14
No updates have beenposted at this time.

Pure Stock Rules:
6-4-15
Update to wheel, tire and weight rules (view on download). All wheel offsets must match; those using Hoosier 35, 35R and 35W tires do not have to be take-offs; minimum weights have been adjusted.