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2009 IMSTAR
RULEBOOK
(Revised 6-9-09) |
Street Fighter
Entry Fee - $40
(9.99 and quicker cars only)
Race Format:
Quick 16 field, Pro ladder, Heads-up, Pro tree, No breakout
Body:
Any year import body. Aftermarket body parts are limited to hoods,
trunks lids, sunroofs, wings, ground effects, bumpers, and front fenders
only. One-piece front ends are not permitted. All other body parts must
be stock. No body parts may be removed during competition.
Chassis:
Complete stock chassis and frame rails
must be retained. Frames may be notched for clearance. Mini Tubs are
permitted. 4-cylinder cars may be back halved.
Suspension:
Stock style suspension cars only allowed.
Four links and ladder bars are prohibited. Weld on sub-frame connectors
and rear sway bars are permitted. 4-cylinder cars may have any type
suspension. Wheelie bars are prohibited on all cars.
Street Equipment:
Lexan windows are permitted. Interior is
not required.
Exhaust:
Muffler(s) required unless turbocharged.
Electronics:
Two-steps, aftermarket ECU’s, and engine
management systems are allowed.
Driveline:
Aftermarket axles, gear ratios, spools,
and positive traction differentials are permitted. IRS cars may convert
to straight axles only if it is a direct bolt in. Aftermarket axles,
gear ratios, spools, and positive traction differentials are permitted.
Turbocharger:
Turbochargers are measured at the inducer
wheel diameter at the point where the leading edge of the compressor
wheel meets the inlet housing.
Transmission:
Any auto or manual transmission allowed.
Fuel:
Gasoline only permitted. Aftermarket fuel
cells are permitted.
Tires (FWD cars):
Any size DOT radial tire permitted.
Maximum size DOT Bias Ply or Slick is 28.0” x 10.5”.
Tires (RWD cars):
Any size DOT radial tire permitted.
Maximum size DOT Bias Ply or Slick is 30.0” x 11.5W”.
Tires (AWD cars):
Any size DOT radial tire permitted.
Maximum size DOT Bias Ply or Slick is 28.0” x 10.5”.
2-rotor cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger: Any size single or
twin turbochargers are permitted. Any type intercooler permitted. May
combine with Nitrous.
· Minimum Weight: None
4-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger:
Any size single turbocharger permitted.
Any type intercooler permitted. May combine with Nitrous.
· Minimum Weight: None
6-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger: Any size single or
twin turbochargers are permitted. Any type intercooler permitted. May
combine with Nitrous.
· Minimum Weight: (FWD cars) None
· Minimum Weight: (RWD & AWD cars) 3200 lbs.
Wild Street
Entry Fee - $40
(10.99 and quicker cars only)
Race Format:
Quick 16 field, Pro ladder, Heads-up, Pro tree, No
breakout
Body:
1987 & newer vehicles only (VW models are permitted to run any year
vehicle). Aftermarket body parts are limited to hoods, trunks
lids, sunroofs, wings, ground effects, bumpers, and front fenders only.
One-piece front ends are not permitted. All other body parts must be
stock. All windows must be functional. No body parts may be removed
during competition.
Chassis:
Full stock chassis is required. Cutting or drilling for lightening
purposes of the chassis is not permitted.
Suspension: Stock type suspension cars only. Aftermarket direct
replacement A-arms, struts, and shocks are allowed. Wheelie bars and
ladder bars are prohibited.
Street Equipment:
All windows must be OEM glass. Headlights and brake lights are required
(one headlight may be removed for air induction). Stock dashboard and
full interior from front seats forward is required (both front seats are
required). Aftermarket interior and seats are permitted.
Exhaust:
Muffler(s) are required unless vehicle is turbocharged.
Electronics: Two-steps, aftermarket ECU’s, and engine management systems
are allowed.
Driveline:
Cars originally equipped with independent rear suspension must remain
independent rear suspension (IRS conversions to straight rear axle are
prohibited). Aftermarket axles, gear ratios, spools, and positive
traction differentials are permitted.
Turbocharger:
Turbochargers are measured at the inducer wheel diameter at the point
where the leading edge of the compressor wheel meets the inlet housing.
Nitrous Oxide:
On cars that are not permitted to use nitrous oxide, all nitrous bottles
and nitrous/fuel solenoids must be removed off car entirely.
Transmission: OEM transmission from the same manufacturer as car is
required. RWD cars with manual transmission are permitted to use
aftermarket stock-style clutch-assisted transmissions (no sequential
transmissions).
Fuel:
Gasoline only permitted. Aftermarket fuel cells are permitted.
Tires (FWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 26.0” x 10.5”.
Tires (RWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 28.0” x 11.5”.
Tires (AWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 26.0” x 10.5”.
2-rotor cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger (manual transmission): Limited to 80mm single or 60mm
twins. Any type intercooler permitted. May combine with Nitrous.
· Turbocharger (auto transmission): Limited to a 76mm single or 58mm
twins. Any type intercooler permitted. May combine with Nitrous.
· Minimum Weight: None
4-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger (manual transmission): Limited to 72mm single. Any type
intercooler permitted. May combine with Nitrous.
· Turbocharger (auto transmission): Limited to a 72mm single. Any type
intercooler permitted. Turbocharger cannot be combined with nitrous
unless vehicle is equipped with OEM automatic transmission for engine
used.
· Minimum Weight: None
6-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger (manual transmission): Limited to 80mm single or 60mm
twins. Air to air intercoolers only. May combine with Nitrous.
· Turbocharger (auto transmission): Limited to a 76mm single or 58mm
twins. Air to air intercoolers only. May combine with Nitrous. (Nitrous
prohibited on Domestic V6).
· Minimum Weight: None
True Street
Entry Fee - $40
(11.99 and quicker cars only)
Race Format:
Quick 16 field, Pro ladder, Heads-up, Pro tree, No breakout
Body: 1987 & newer vehicles only. Aftermarket body parts are limited to
hoods, trunks lids, sunroofs, wings, ground effects, bumpers, and front
fenders only. One-piece front ends are not permitted. All other body
parts must be stock. All windows must be functional. No body parts may
be removed during competition.
Chassis:
Full stock chassis is required. Cutting or drilling for lightening
purposes of the chassis is not permitted.
Suspension: Stock type suspension cars only. Aftermarket direct
replacement A-arms, struts, and shocks are allowed. Wheelie bars and
ladder bars are prohibited.
Street Equipment:
All windows must be OEM glass. Headlights and brake lights are required
(one headlight may be removed for air induction). Stock dashboard and
full interior from front seats forward is required (both front seats are
required). Aftermarket interior and seats are permitted.
Exhaust:
Muffler(s) are required unless vehicle is turbocharged.
Electronics:
Two-steps, aftermarket ECU’s, and engine management systems are allowed.
Driveline:
Cars originally equipped with independent rear suspension must remain
independent rear suspension (IRS conversions to straight rear axle are
prohibited). Aftermarket axles, gear ratios, spools, and positive
traction differentials are permitted.
Turbocharger:
Turbochargers are measured at the inducer wheel diameter at the point
where the leading edge of the compressor wheel meets the inlet housing.
Nitrous Oxide:
On cars that are not permitted to use nitrous oxide, all nitrous bottles
and nitrous/fuel solenoids must be removed off car entirely.
Transmission:
OEM transmission from the same manufacturer as car is required. RWD cars
with manual transmission are permitted to use aftermarket stock-style
clutch-assisted transmissions (no sequential transmissions).
Fuel: Gasoline only permitted. Aftermarket fuel cells are permitted.
Tires (FWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 25.0” x 9”.
Tires (RWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 26.0” x 11.5”.
Tires (AWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 26.0” x 10.5”.
2-rotor cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger (manual transmission): Limited to 72mm single or 58mm
twins. Air to air intercoolers only. Cannot combine with Nitrous.
· Turbocharger (auto transmission): Limited to 72mm single or 58mm
twins. Air to air intercoolers only. Cannot combine with Nitrous.
· Minimum Weight: None
4-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger (manual transmission): Limited to 67mm single. Air to air
intercoolers only. Cannot combine with Nitrous.
· Turbocharger (auto transmission): Limited to a 64mm single. Air to air
intercoolers only. Cannot combine with Nitrous.
· Minimum Weight: None
6-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Induction: Engine must be EFI. Any style intake is permitted.
· Turbocharger (manual transmission): Limited to 72mm single or 58mm
twins. Air to air intercoolers only. Cannot combine with Nitrous.
· Turbocharger (auto transmission): Limited to a 67mm single or 56mm
twins. Air to air intercoolers only. Cannot combine with Nitrous.
· Minimum Weight: None
All-Motor Street
Entry Fee - $40
(12.99 and quicker cars only)
Race Format:
Quick 16 field, Pro ladder, Heads-up, Pro tree, No breakout
Body:
1987 & newer vehicles only. Aftermarket body parts are limited to hoods,
trunks lids, sunroofs, wings, ground effects, bumpers, and front fenders
only. One-piece front ends are not permitted. All other body parts must
be stock. All windows must be functional. No body parts may be removed
during competition.
Induction:
Engine must be EFI. Any style intake or individual throttle bodies are
permitted
Chassis:
Full stock chassis is required. Cutting or drilling for lightening
purposes of the chassis is not permitted. Aftermarket “K” members are
permitted on RWD cars.
Suspension:
Stock type suspension cars only. Aftermarket direct replacement A-arms,
struts, and shocks are allowed. Wheelie bars and ladder bars are
prohibited.
Street Equipment:
All windows must be OEM glass. Headlights and brake lights are required
(one headlight may be removed for air induction). Stock dashboard and
full interior from front seats forward is required (both front seats are
required). Aftermarket interior and seats are permitted.
Exhaust:
Muffler(s) are required.
Electronics:
Two-steps, aftermarket ECU’s, and engine management systems are allowed.
Driveline:
Cars originally equipped to independent rear suspension must remain
independent rear suspension (IRS conversions to straight rear axle are
prohibited). Aftermarket axles, gear ratios, spools, and positive
traction differentials are permitted.
Nitrous Oxide:
On cars that are not permitted to use nitrous oxide, all nitrous bottles
and nitrous/fuel solenoids must be removed off car entirely.
Transmission:
OEM transmission from the same manufacturer as car is required. RWD cars
with manual transmission are permitted to use aftermarket stock-style
clutch-assisted transmissions (no sequential transmissions).
Fuel: Gasoline only permitted. Aftermarket fuel cells are permitted.
Tires (FWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 25.0” x 9”.
Tires (RWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 26.0” x 10.5”.
4-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Power Adders: Prohibited
· Minimum Weight: B series & other series motors - 2050 lbs
· Minimum Weight: F series & K series motors - 2200 lbs
6-cylinder cars:
· Engine: OEM block from same manufacturer as car is required. Block may
be swapped between different models of same manufacturer. Aftermarket
blocks are prohibited.
· Power Adders: Prohibited
· Minimum Weight: All series motors - 2100 lbs
Street Stock
Entry Fee - $40
(14.99 and quicker cars only)
Race Format:
Quick 16 field, Pro ladder, Heads-up, Pro tree, No breakout
Body:
1987 & newer vehicles only. Aftermarket body parts are limited to hoods,
trunks lids, sunroofs, wings, ground effects, bumpers, and front fenders
only. One-piece front ends are not permitted. All other body parts must
be stock. All windows must be functional. No body parts may be removed
during competition.
Induction:
Engine must be EFI. Any style intake is permitted (individual throttle
bodies are prohibited).
Chassis:
Full stock chassis is required. Cutting or drilling for lightening
purposes of the chassis is not permitted.
Suspension:
Stock type suspension cars only. Aftermarket direct replacement A-arms,
struts, and shocks are allowed. Wheelie bars and ladder bars are
prohibited.
Street Equipment:
All windows must be OEM glass. Headlights and brake lights are required
(one headlight may be removed for air induction). Stock dashboard and
full interior from front seats forward is required (both front seats are
required). Aftermarket interior and seats are permitted.
Exhaust:
Muffler(s) are required.
Electronics:
Two-steps, aftermarket ECU’s, and engine management systems are allowed.
Driveline:
Cars originally equipped to independent rear suspension must remain
independent rear suspension (IRS conversions to straight rear axle are
prohibited). Aftermarket axles, gear ratios, spools, and positive
traction differentials are permitted.
Nitrous Oxide:
On cars that are not permitted to use nitrous oxide, all nitrous bottles
and nitrous/fuel solenoids must be removed off car entirely.
Transmission:
OEM transmission from the same manufacturer as car is required.
Aftermarket transmissions are prohibited.
Fuel:
Gasoline only permitted. OEM functional gas tank must be used.
Modifications to the sump area are permitted.
Tires (FWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 25.0” x 9”.
Tires (RWD cars):
Any size DOT radial tire
permitted. Maximum size DOT Bias Ply or Slick is 26.0” x 10.5”.
2-rotor cars:
· Engine: No motor swaps allowed. Engine and cylinder head must have
been available for year, make, and model of car sold in USA.
· Power Adders: Prohibited
· Minimum Weight: None (due to the wide range of vehicle types and stock
type nature of vehicles)
4-cylinder cars:
· Engine: No motor swaps allowed. Engine and cylinder head must have
been available for year, make, and model of car sold in USA.
· Power Adders: Prohibited
· Minimum Weight: None (due to the wide range of vehicle types and stock
type nature of vehicles)
6-cylinder cars:
· Engine: No motor swaps allowed. Engine and cylinder head must have
been available for year, make, and model of car sold in USA.
· Power Adders: Prohibited
· Minimum Weight: None (due to the wide range of vehicle types and stock
type nature of vehicles)
Street ET
Entry Fee - $30
(Open to street cars of any ET)
Race Format:
ET Bracket racing on a .500 full tree.
Body:
Any year vehicles are allowed.
Chassis:
Full stock chassis is required.
Engine:
2-Rotor, 4-cylinder, and 6-cylinder cars only permitted (8-cylinder,
10-cylinder, and 12-clyinder engines are permitted if it is an import
vehicle)
Power Adders:
Any power adders are permitted.
Suspension:
Stock type suspension cars only. Wheelie bars are prohibited.
Street Equipment:
All windows must be OEM glass. Headlights and brake lights are required
(one headlight may be removed for air induction).
Exhaust:
Muffler(s) are required unless turbocharged.
Electronics:
Two-steps are permitted on manual transmission cars only. Delay boxes,
transbrakes, and air shifters are prohibited.
Tires:
Any size DOT radial tire,
DOT Bias Ply, or Slick is permitted.
Streetbike ET
Entry Fee - $30
(Open to street bikes of any ET.)
Race Format:
ET Bracket racing on a .500 full tree.
Body:
Any type streetbike
Engine:
2-cylinder and 4-cylinder engines are permitted.
Suspension:
Wheelie bars are prohibited.
Street Equipment:
Headlight and brake light is required.
Exhaust:
Muffler is not required.
Electronics:
Delay boxes are prohibited.
Tires:
DOT tires only are permitted.
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