MW8.5RA RULES 2015
(Midwest 8.5 Racers Association)
This is an 1/8th mile heads-up class run on a .400 pro tree with a pro ladder.
Class is designed for rear wheel drive small block and big block vehicles with single stage plate systems, boosted small blocks and naturally aspirated small/big blocks.
All NHRA/IHRA and local track safety rules apply for driver and car.
26x8.5 slicks or 235 radial- May have Mickey Thompson(3052) ET Street 235 Radial (3752R) or Hoosier (18115C11) only.
The car must retain its original appearance, profiles, and dimensions. Aftermarket fiberglass and/or carbon fiber replacement panels are allowed. All body panels must be factory style. No 1 piece bodies or full composite front ends. Must have separate detachable hood and hood must be used. Aftermarket wings and spoilers are permitted. Forward facing hood scoops/turbo or supercharger inlets are permitted. Beam trippers, extenders prohibited.
Must have factory style dash and door panels(Aftermarket replacement fiberglass, aluminum, carbon fiber allowed). Carpet may be omitted for safety. Factory floor pan on driver and passenger side required. Must have factory transmission tunnel. Aftermarket steering column permitted.
OEM glass or lexan windows are permitted.
Stock chassis and frame rails must be retained from shock tower to the rear wheel opening (notching permitted). Back halved cars are not permitted. Front core support may be modified or removed. Aftermarket bolt-on replacement front K-members/sub frames are allowed. Front shocks must be in factory location. Shock tower can be notched or trimmed but must be in factory location. Firewall may be modified but must be factory. Bolt in style front ends allowed. Factory wheelbase must be maintained. No round tube frames or race car 4-links allowed.
Mufflers or inserts are required on all cars except for turbo cars. Exhaust may exit underneath car or out the front fenders but must not affect timing or staging beams.
Stock style, ladder bar or torque arm suspension cars only. Aftermarket four links are prohibited on all cars. Aftermarket replacement components such as: front control arms, rear control arms, front coil over shocks, and rear coil over shocks are permitted. Rear suspension may be moved to accommodate tire clearance and does not need to be mounted in stock location. Wheelie bars prohibited.
Any ignition or efi system on all combos. Boost controller legal. N2O controllers legal. Traction control legal. Data logging allowed. No optical devices. Must have working headlights and taillights. Any charging system legal.
TRANSMISSION – any automatic or manual transmission allowed
FUEL – Any race fuel, ethanol or alcohol. No Nitro
SB BOOST(Small block only)
Blower(single blower limited to F1R or equivalent)
F1/equivalent or smaller 2950
F1A/F1A-94/YSI/6-71 or equivalent 3050
F1C/F1C-94/8-71 or equivalent 3150
F1R/F1C 10.5/XI/10-71 or equivalent 3250
Small block Turbo(single turbo limited to 88mm)(Twin turbo limited to 62mm max)
67mm and below 2900
83-88mm (no billet wheels) 3250
Twin 62mm 3250
* No billet wheels on any turbo larger than 82mm **Billet wheels allowed on twin turbo combos. Turbocharger size will be verified by measuring the impeller wheel tip to tip or by go no go gauge. Stepped or clipped compressor wheel prohibited. Surge holes/slots are ok.
GENERAL WEIGHT RULES
-50 Mickey Thompson (3052)
-50 Air to Air or Non Intercooled (Race gas only)
-50 Blow through carb
-50 Belt driven centrifugal supercharger(no break for cog style, ribbed belt only)
-50 leaf springs
-50 for small block Boosted factory valve angle heads(20*Ford, 23*Chevy, 15*LS 18*Mopar, Modular, BOP/AMC)
-50 Iron headed combos (NA or N20)
-50 4150 Carb (NA or N20)
-50 Single carb, cast manifold NA combo
-150 Big block BOP/AMC
-100 for small block NA and N20 factory valve angle heads(20*Ford, 23*Chevy, 15*LS 18*Mopar, Modular, BOP/AMC)
-200 6 cylinder
-800 4 cylinder
SMALL BLOCKS—N2O/BIG BLOCKS-N20
Any single carb or throttle body allowed
Aftermarket cast iron/aluminum blocks ok(No billet), any cast heads ok on small blocks(No billet)
Any engine with more than 440 ci will run under big block rules
Big blocks MAX deck height(10.2 Chevy, 10.3 Ford, 10.7 Mopar, Any BOP No billet) 599 MAX CI and conventional heads only(We will refer to X275 accepted list of heads for reference of acceptable heads)
No sheet metal intakes allowed, only cast, commercially available(may be modified runners must be cast)
Allowed any single stage plate system (If in question must have approval) May have one fuel and one N2O solenoid max on carb applications. EFI allowed dry/wet plate kit or 2 nozzles with 1 N20 solenoid max. Foggers can be installed on car but must be capped before tech.
May have an inline single purge solenoid which must exit away from intake
Nitrous controllers allowed. Water injection legal. No cold boxes etc.
Single line only from N20 bottle to N20 solenoid and must have a single line that's 12" MINIMUM of -4an line with -4an fittings MAX entering N20 solenoid. Nano or other pressure regulating systems are allowed. Only a single N20 bottle may be mounted and hooked to n20 feed line.
-4 line I.D. of .230 max
-4 fitting I.D. of .160 max ***A spec line can be purchased from MW8.5RA
BOOSTED(SMALL BLOCK ONLY)(No N20 any boosted combo except 4cyl)
Aftermarket cast iron/aluminum blocks ok (No billet/exception 4cy), any cast heads ok (No billet/exception 4cy)
Max ci 440
Single carb or throttle body allowed
No sheet metal intakes allowed, only cast commercially available(may be modified runners must be cast). Custom elbow ok
Methanol injection legal
Forward facing turbo/blower legal
Gear drive for blower legal
Any Intercooler allowed
Must be naturally aspirated
Aftermarket cast iron/aluminum blocks ok (no billet)
No CI limit
Multiple carb/throttle body legal
Must be naturally aspirated
Aftermarket cast iron/aluminum blocks ok (no billet)(Max 10.2 deck Chevy, 10.3 Ford, 10.7 for Mopar, any BOP)
632 MAX CI
Multiple carb/throttle body legal
Car tech will be done randomly at races. If found in violation of rules(that are considered to gain an unfair advantage) a one race suspension will be put in place. 2nd offense removal from series for rest of season.
PARITY – OFFICIALS MAY IMPOSE RESTRICTIONS TO ANY PARTICIPANT DISPLAYING ADVANTAGEOUS PERFORMANCE.
LEGALITY OF ANY CAR IS THE DECISION OF THE RACE/TECH DIRECTOR.
MW8.5RA RESERVES THE RIGHT TO CHANGE OR MODIFY RULES IF NECESSARY NO LESS THAN 14 DAYS BEFORE NEXT SCHEDULED RACE
EMAIL MW85RA@YAHOO.COM FOR QUESTIONS OR CONCERNS