Pontiac Pavement Pounders Shootout - Norwalk Raceway Park Part 4
Owner Bio: Jim Gnadt Jim's profession has aided in his racing exploits. "I'm a product development engineer for Gear Production Equipment and have been able to apply my experience and skills to my racing hobby. Regarding this new '70 GTO racecar, the 53-year-old states, "Although I had a fast '70 GTO convertible race car, this hardtop is a step up in terms of performance, safety, and reliability. It was built in my home garage from scratch, so it really brings together what I feel are the best features for a fast, bracket car." Jim also tells HPP, "Building and racing Pontiacs has been a real family activity for my wife, Jan, and I (for the last nine years). She has shared in the sacrifices and work to get to this level, is the sole member of my pit crew at every race, and is my greatest fan." The Gnadt's past Pontiacs include a '64 421 Catalina Ventura, an OHC-6 '67 Firebird and many GTOs. An original '70 GTO 455 convertible currently resides in his garage. | STRIP SPECS | | Year/Model: | Full tube-chassis '70 GTO | | Race Weight: | 2,715 lbs | | Curb Weight: | 2,415 lbs | | Fuel Level: | 3/4-full, custom aluminum 4-gal cell by owner | | Fuel: | 110-Octane Sunoco Racing | | Engine: | '73 455 | | Cubic Inches Before/After: | 455/462 | | Engine Built By: | Owner, machining by Engine Assembly, Rochester, NY | | Power Adder: | NOS fogger, 0.024 NOS/0.022 fuel jets, 10# bottle | | Top End | | Air Cleaner: | None | | Carburetor: | Two Holley/Proform 750 DP | | Jets, Primary/Secondary: | #80/#80 | | Spacer Plates: | Custom by owner, 1-in aluminum, 4-hole | | Intake Manifold: | Custom sheetmetal tunnel ram (by owner) | | Fuel Pump: | Magnafuel Quickstar 300 electric | | Lines, Size: | -10 AN to regulator, -8 to carbs | | Regulator: | Two Magnafuel, 6 psi for carbs, 10 psi for NOS | | Heads: | Edelbrock 72cc | | Head Porting: | Yes, by owner | | Flow Numbers: | 334/241 cfm at 0.700 lift, 28-in pressure | | Valves: | Custom Manley SS, 2.125/1.770 | | Bottom End | | Pistons: | Custom Wiseco forged flat-top, 4.181-in | | Piston Pins: | 0.990-in diameter, floating | | Rings: | Total Seal Gapless 0.062/0.062/0.188 | | Rods: | Crower Sportsman forged-steel, 6.625-in length | | Compression Ratio: | 11.25:1 | | Crankshaft: | Stock nodular 4.210-in stroke | | Rotating Assembly Balanced: | Yes | | Camshaft | | Brand: | Comp Cams solid roller | | Duration at 0.050: | 270/282-deg | | Duration Advertised: | 304/320-deg | | Lift with Specified Rocker Arms: | 0.635/0.635 | | Lobe Separation Angle: | 110-deg | | Installed Position: | 106-deg | | Rocker Arms: | Comp Cams 1.65:1 | | Ignition | | Distributor: | Stock w/bronze gear, MSD cap and rotor | | Amplifier: | MSD 7AL3 | | Coil: | MSD Blaster 3 | | Wires: | MSD 8.5 mm | | Spark Plugs: | AR3932 | | Total Timing: | 34-deg locked, retarded 4 deg for NOS | | Exhaust | | Headers: | Custom by owner with Swain Technology thermal barrier | | Primaries: | 2.00/2.125/2.250-in stepped, 29-in primary tube length | | Collectors: | 4.00-in | | Drivetrain | | Transmission: | Turbo 400, ATI input shaft and direct drum, Griner brake | | Converter: | Competition Transmission 9-in, 5,600-stall (6,100-stall with NOS) | | Shifter: | B&M Pro Ratchet, Shiftnoid electric shifting system | | Rear: | Mark Williams 9-in center, Fab-9 moly housing, Strange axles | | Rear-Gear Ratio: | 4.29:1 | | Spool: | Mark Williams 35-spline | | Chassis and Suspension | | Brakes F/R: | Wilwood Dynalite disc 10.5-in/11.00-in | | Wheels F/R: | Centerline Warrior 15x4/15x15 | | Tires F/R: | Metric hi-speed radial/Goodyear 33.5x15 slicks | | Tire Pressure F/R: | 35 psi/7.5 psi | | Suspension Front | | Type: | Strut, RJR rack & pinion | | Springs: | QA1 450 lb/in | | Control Arms: | Strange | | Stabilizer Bar: | None | | Struts: | Strange adjustable, set at middle of range | | Suspension Rear | | Type: | 4-link by owner | | Springs: | QA1 130 lb/in | | Locator: | Wishbone | | Control Arms: | Moly tube 1.25-in | | Antiroll Bar: | Competition Engineering 1.125-in | | Shocks: | Koni double-adjustable coilovers set at middle of range | | Other Features: | Custom wheelie bars by owner | | Chassis: | Full tube, (mostly 15/8-in diameter) chrome-moly to SFI 25.4, by owner | | The Rest | | Interior Mods: | Aluminum sheet by owner | | Exterior Mods: | RJR Scoop, custom rear airfoil by owner | | Safety Mods: | Tube chassis, SFI-approved ATI super damper and other drivetrain parts, RCI 5-point harness, Safetycraft Halon fire system, Simpson parachute | | Paint: | Black by Norm Dillon, Macedon, NY | | Launch Technique: | 5,000 rpm from transbrake w/o NOS | | Best 1/8-mile ET, MPH Prior to Event: | 5.37/129.51 mph | | Best 1/4-mile ET, MPH Prior to Event: | 8.42/161.34 mph |
| STRIP TUNING LOG | | Run | Tuning | Launch RPM | Shift Pt. | 60-ft | 1/8-mile | 1/4-mile | | 1. | Density alt. 3,504 6.5-psi in tires, mistakenly left floats set too low | 5,000 | 6,700 | 1.29 | 5.57/129.89 | 8.67/154.72 | | 2. | Density alt. 3,667 adjust floats higher, 6.75 psi in tires | 5,000 | 6,700 | 1.26 | 5.52/130.17 | 8.61/155.49 | | 3. | Density alt. 3,705 6.75 psi in tires | 5,000 | 6,700 | 1.26 | 5.52/130.02 | 8.61/156.90 | | 4. | Density alt. 3,426 7 psi in tires | 5,000 | 6,700 | 1.25 | 5.49/130.62 | 8.58/155.24 | | BEST PASS CORRECTED | *8.22/162.02 | | Run Notes: 1) Bogged the end of first gear, loose track at top end; 2) No bog this time, top end still loose; 3) No changes to car, nearly identical run to last; 4) More tire pressure.*calculated for 3,400-foot density altitude | |
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