TSO Class Rules

[Orlando_87GN]

Turbo Street Outlaw – TSO (official 10/01/2004)

General

• Qualifying ET is 9.99 or quicker.
• Heads-up .400 pro tree start and pro ladder.
• Winner and runner-up are subject to re-weigh and re-tech immediately after final round or at any other time.
• Entrants caught breaking the rules will be disqualified from the TSO class.

Chassis

• Current NHRA certified seat restraints, helmet and fire suit required.
• Car should be NHRA certified.
• Car should possess all applicable safety equipment for potential ET/speeds attained.
• Minimum car weight w/driver must be 3,400 pounds.
• Removable ballast is limited to 100 pounds maximum.
• Stock wheelbase required (108.0" measured).
• Engine/firewall must be in stock location.
• Factory stock body lines/contours must be maintained (i.e. hood, doors, fenders, wheel openings, bumpers, trunk lid, etc). *** Non-factory rear stabilizer wings are allowed.
• Any fiberglass or carbon fiber body panels, bumpers, etc. allowed, no hood scoops.
• Complete, painted Buick Turbo Regal/Grand National body required.
• Stock operating glass windows and windshield are required, no lexan.
• Lights and horn must be operational.
• Stock front inner wheel wells required. Trimming allowed for downpipe clearance.
• Full stock GM frame is required, no tube chassis cars are allowed.
• Modifications to stock rear wheel wells allowed, mini-tubs are allowed, outer frame rails notching allowed, inner rails remain in the stock location.
• Reinforcements at inner rear frame rails are allowed.
• Stock style rear suspension only, no ladder bars or aftermarket 4 links allowed.
• Coil-over equipped rear suspension allowed.
• Drive shaft safety loop required.
• No restrictions on braking system, power or manual brakes are allowed.
• Brake system line locks allowed.
• Wheelie bars are allowed.
• Parachutes are required for trap speeds in excess of 150 mph.

Engine

• Any Buick V6 cylinder block allowed, no cubic inch displacement limits.
• Any oil pan allowed, no dry sump oiling system allowed.
• Any cylinder heads, allowed.
• Any intake manifold and plenum allowed.
• Any size single stock or aftermarket throttle body allowed w/single throttle plate only.
• Any type of stock location headers & crossover allowed.
• No restrictions on engine driven accessories; i.e. alternator, water pump, p/s, etc.
• A/C and heating equipment may be removed.

Turbo, Downpipe & Intercooler

• Any single 3-bolt or 4-bolt stock location turbo allowed. Turbo compressor size limited up to and including a mid-frame 88mm, large frame "Thumper" style turbos are not allowed.
• A 4”maximum size, stock location downpipe is allowed w/ a 5" inlet/transition at the turbo reduced down to 4” immediately after the 90* elbow at the turbo exit. It must be routed down through the stock location.
• No flex pipe allowed.
• A 4”maximum size single or dual exhaust system is allowed. It must muffle and exit at/behind the rear axle tube(s), away from the car, equal to the lower body line.
• Any wastegate configuration allowed.
• Any stock location or front mount air to air intercooler is allowed.
• No liquid intercoolers, intercooler external spray cooling or add-on cold boxes allowed.

Engine Management & Fuel System

• Battery may be in any location.
• Any ECM/fuel management system is allowed w/ any onboard electronics are allowed.
• Any air induction system allowed.
• Stock fuel tank w/sump addition or fuel cell allowed.
• Any fuel pump(s) configuration/location w/ any fuel lines allowed.
• Any fuel rail(s) allowed.
• Any type fuel pressure regulator allowed.
• Any size fuel injectors allowed, no limit on number used.
• Gasoline fuel only, no additives, alcohol, or nitrous oxide injection allowed.

Transmission

• Any GM automatic transmission, 200-4R, TH400 w/ any torque converter allowed.
• No Lenco, Liberty or manual transmissions with or without clutch allowed.

Differential

• Any type stock width differential housing allowed, +/- 1" allowance w/ limited-slip differentials or spool allowed and any gear ratio allowed.

Wheels & Tires

• Any matched set of four 15" diameter wheels allowed.
• Slicks w/ sidewall designation up to a 29.5” x 11.50” -15” size tire w/ a maximum measured footprint of 11.25” is allowed, W tires are allowed.
  *** Phoenix Brand 11.5”standard and W sidewall designation tires are not allowed do to tread width restrictions.
• DOT street tires w/sidewall designations up to a 30.0” x 13.50”-15” size tire are allowed.

Interior

• Stock dash must be retained with any gauges and any transmission shifter allowed.
• A maximum of 2 hood mounted gauges allowed.
• Car must have a fully carpeted floor board w/2 front seats, door panels, headliner, applicable interior trim, etc.
• Rear seat may be removed; area must be carpeted to match interior color.