JGC403
Well-Known Member
I have always wanted to build a dirt track car, now that I moved there is one only a couple of miles away. So now is the time to build a car, track is close by and my 1976 Duster is a little to far gone to restore.
They have an entry level class that I was going to build my car for but it looks like last year there were only 4 people in the class and this year no one is in it. So the next level up is what they call Modified Street.
Track is a 4/10 mile long, high banked 32 degrees. Top cars in this class are running around 15 second laps.
This class has unlimited engine, only need to have cast iron heads and block, one carb, no dry sump. Cars have to weight either 2,800 or 3,000 lbs based on tires.
2,800 if you are running DOT street tread tire or 3,000lbs if running used late model tire.
How much power do I need to be competitive and is it worth the 200lbs weight penalty to run late model tire or keep it light and run street tires?
I'm figuring on using a 833 transmission and a B-body 8 &3/4 rear with a spool, not sure on gears. Mopar rear leaf springs, probably use sliders since the rules allow.
Any suggestions appreciated.
Rules:
MODIFIED STREET
*** Beginning Friday, May 6, 2016 – Steel Head Late Model and Sportsman Late Model drivers may also compete in Modified Street, but you must have two different race cars. You’ll be required to buy an extra pit pass (driver only) if competing in two classes.
80-1 … BODY
a. Any full-size, rear-wheel drive passenger automobile or pickup truck (any year) with a minimum 104 inch wheel-base. No station wagons, convertibles or T-top vehicles permitted. Must be street type cars, no clip cars.
b. Tubular asphalt Late Model Stock Car chassis permitted.
c. All cars/trucks must remain stock appearing from front to rear.
d. Steel, composite or aluminum body panels will be permitted (rear may be left open).
e. Aftermarket stock appearing plastic nose pieces are permitted.
f. All doors must be welded shut.
g. The interior must be completely gutted.
h. All glass and trim must be removed.
i. Hood and trunk must be fastened with hood pins.
j. Inner fenders can be removed in front only.
k. No bracing of any item allowed.
l. 8 inch maximum rear spoiler permitted.
80-2 … SAFETY
a. Aluminum racing seat required.
b. Five-point racing harness required mounted to cage. Must be within two years of manufacture and label must be attached.
c. Driving suit, top and bottoms required.
d. Driving gloves required.
e. Working fire extinguisher required, within reach of driver.
f. Fuel cells required and mounted properly in center of trunk. Sixteen (16) gallon maximum.
g. Battery must be located either/or – on the right side of the floor or recommended behind driver. Must be securely fastened and enclosed in a battery box.
h. Drive shaft must have two loops, front and rear, 1/4 inch x 2 inch. Drive shaft must be painted white.
i. Three bars in front of driver at windshield location. 1/8 inch x 1 inch.
j. A roll cage is required using (minimum) 1 1/2 inch x .095 roll bar tubing. Four-point cage (minimum) with front loop required, but six-point cage highly recommended. Must have minimum four (4) door bars at driver’s side and three (3) passenger door bars. Doors may be hulled out for bars. All bars within drivers reach must be padded. Recommend (not required) steel or aluminum plate over driver’s side door bars. A protective bar (minimum 1 1/2 inches in diameter) must be located around inside the rear trunk area and below the rear frame section behind the fuel cell.
k. Steel firewall between driver and rear fuel cell.
l. Window net required.
80-3 … SUSPENSION
*** Attention Modified Street competitors: According to VIC HILL – third link (or pull-bar) cannot be mounted any more forward than back of drivers seat. … Make sure your race car conforms!!!
a. Stock type rear suspension, three (3) or four (4) link permitted. Can have heim and tube trailing arms. No chaining permitted.
b. Screw jacks permitted (not required).
c. Racing springs and shocks permitted, may be relocated. Non-adjustable shocks only! Coil overs allowed. Leaf spring cars may have sliders.
d. Frame height must be minimum of 5 1/2 inches. However, a 1/2 inch tolerance will be permitted.
e. Stock steering box or rack (No late model type racks). May use quick release steering wheel with steering column in stock location.
80-4 … TRANSMISSION
a. Either stock, Bert or Brinn transmissions permitted. Must have reverse gear.
80-5 … EXHAUST
a. Headers are permitted!!! With headers being allowed, please take note that no turn-down headers will be permitted. Open headers are allowed, but the pipes can’t be turned down toward the racing surface.
80-6 … IGNITION
Stock or MSD ignition permitted. Absolutely no traction control permitted!
80-7 … REAR END
a. Stock, or 9-inch Ford rear-end recommended.
b. Quick-change allowed “only” for tubular asphalt Late Model Stock Car, however, must have steel axle tubes. Absolutely no lightweight dirt Late Model quick-change permitted!!! *** No gear changes after hot laps, if so start at rear of field.
80-8 … WEIGHT
According to tire size – either 3,000 pounds or 2,800 pounds. … See section 80-10 below for tire/weight info.
a. Driver will receive 25 lb. weight break if wearing HANS device.
* Weight must be posted on right side to be viewed at scales.
** If weight is not posted on car before qualifying, you will only have 1 qualifying lap.
*** Failure to post correct weight (before race) will result in disqualification following event at scales.
80-9 … WHEELS
a. Steel wheels only (10-inch maximum width).
b. Longer studs permitted.
c. Can be double-nutted.
80-10 … TIRES
a. Late Model (take-offs) tires allowed, and “they must be used tires!” No new Late Model tires permitted!!!
b. Also, DOT street-tread stamped highway radial tires are allowed. … No mud, snow, or off road tires permitted.
c. Tubular asphalt Late Model Stock Car chassis = 3,000 pounds (car weight with driver)
d. Any type Late Model tire = 3,000 pounds (car weight with driver)
e. DOT Street-tread tire = 2,800 pounds (car weight with driver)
f. Steel wheels only (10-inch maximum width).
80-11 … ENGINE
a. Open engine.
b. Cast iron heads, cast iron block. Absolutely no aluminum block or heads! No dry sump.
c. One carburetor allowed.
They have an entry level class that I was going to build my car for but it looks like last year there were only 4 people in the class and this year no one is in it. So the next level up is what they call Modified Street.
Track is a 4/10 mile long, high banked 32 degrees. Top cars in this class are running around 15 second laps.
This class has unlimited engine, only need to have cast iron heads and block, one carb, no dry sump. Cars have to weight either 2,800 or 3,000 lbs based on tires.
2,800 if you are running DOT street tread tire or 3,000lbs if running used late model tire.
How much power do I need to be competitive and is it worth the 200lbs weight penalty to run late model tire or keep it light and run street tires?
I'm figuring on using a 833 transmission and a B-body 8 &3/4 rear with a spool, not sure on gears. Mopar rear leaf springs, probably use sliders since the rules allow.
Any suggestions appreciated.
Rules:
MODIFIED STREET
*** Beginning Friday, May 6, 2016 – Steel Head Late Model and Sportsman Late Model drivers may also compete in Modified Street, but you must have two different race cars. You’ll be required to buy an extra pit pass (driver only) if competing in two classes.
80-1 … BODY
a. Any full-size, rear-wheel drive passenger automobile or pickup truck (any year) with a minimum 104 inch wheel-base. No station wagons, convertibles or T-top vehicles permitted. Must be street type cars, no clip cars.
b. Tubular asphalt Late Model Stock Car chassis permitted.
c. All cars/trucks must remain stock appearing from front to rear.
d. Steel, composite or aluminum body panels will be permitted (rear may be left open).
e. Aftermarket stock appearing plastic nose pieces are permitted.
f. All doors must be welded shut.
g. The interior must be completely gutted.
h. All glass and trim must be removed.
i. Hood and trunk must be fastened with hood pins.
j. Inner fenders can be removed in front only.
k. No bracing of any item allowed.
l. 8 inch maximum rear spoiler permitted.
80-2 … SAFETY
a. Aluminum racing seat required.
b. Five-point racing harness required mounted to cage. Must be within two years of manufacture and label must be attached.
c. Driving suit, top and bottoms required.
d. Driving gloves required.
e. Working fire extinguisher required, within reach of driver.
f. Fuel cells required and mounted properly in center of trunk. Sixteen (16) gallon maximum.
g. Battery must be located either/or – on the right side of the floor or recommended behind driver. Must be securely fastened and enclosed in a battery box.
h. Drive shaft must have two loops, front and rear, 1/4 inch x 2 inch. Drive shaft must be painted white.
i. Three bars in front of driver at windshield location. 1/8 inch x 1 inch.
j. A roll cage is required using (minimum) 1 1/2 inch x .095 roll bar tubing. Four-point cage (minimum) with front loop required, but six-point cage highly recommended. Must have minimum four (4) door bars at driver’s side and three (3) passenger door bars. Doors may be hulled out for bars. All bars within drivers reach must be padded. Recommend (not required) steel or aluminum plate over driver’s side door bars. A protective bar (minimum 1 1/2 inches in diameter) must be located around inside the rear trunk area and below the rear frame section behind the fuel cell.
k. Steel firewall between driver and rear fuel cell.
l. Window net required.
80-3 … SUSPENSION
*** Attention Modified Street competitors: According to VIC HILL – third link (or pull-bar) cannot be mounted any more forward than back of drivers seat. … Make sure your race car conforms!!!
a. Stock type rear suspension, three (3) or four (4) link permitted. Can have heim and tube trailing arms. No chaining permitted.
b. Screw jacks permitted (not required).
c. Racing springs and shocks permitted, may be relocated. Non-adjustable shocks only! Coil overs allowed. Leaf spring cars may have sliders.
d. Frame height must be minimum of 5 1/2 inches. However, a 1/2 inch tolerance will be permitted.
e. Stock steering box or rack (No late model type racks). May use quick release steering wheel with steering column in stock location.
80-4 … TRANSMISSION
a. Either stock, Bert or Brinn transmissions permitted. Must have reverse gear.
80-5 … EXHAUST
a. Headers are permitted!!! With headers being allowed, please take note that no turn-down headers will be permitted. Open headers are allowed, but the pipes can’t be turned down toward the racing surface.
80-6 … IGNITION
Stock or MSD ignition permitted. Absolutely no traction control permitted!
80-7 … REAR END
a. Stock, or 9-inch Ford rear-end recommended.
b. Quick-change allowed “only” for tubular asphalt Late Model Stock Car, however, must have steel axle tubes. Absolutely no lightweight dirt Late Model quick-change permitted!!! *** No gear changes after hot laps, if so start at rear of field.
80-8 … WEIGHT
According to tire size – either 3,000 pounds or 2,800 pounds. … See section 80-10 below for tire/weight info.
a. Driver will receive 25 lb. weight break if wearing HANS device.
* Weight must be posted on right side to be viewed at scales.
** If weight is not posted on car before qualifying, you will only have 1 qualifying lap.
*** Failure to post correct weight (before race) will result in disqualification following event at scales.
80-9 … WHEELS
a. Steel wheels only (10-inch maximum width).
b. Longer studs permitted.
c. Can be double-nutted.
80-10 … TIRES
a. Late Model (take-offs) tires allowed, and “they must be used tires!” No new Late Model tires permitted!!!
b. Also, DOT street-tread stamped highway radial tires are allowed. … No mud, snow, or off road tires permitted.
c. Tubular asphalt Late Model Stock Car chassis = 3,000 pounds (car weight with driver)
d. Any type Late Model tire = 3,000 pounds (car weight with driver)
e. DOT Street-tread tire = 2,800 pounds (car weight with driver)
f. Steel wheels only (10-inch maximum width).
80-11 … ENGINE
a. Open engine.
b. Cast iron heads, cast iron block. Absolutely no aluminum block or heads! No dry sump.
c. One carburetor allowed.
