Reply To: 2017 NSR Porsche 917 Rules discussion

Home Forums Club Races Racing Calendar, Classes & Regulations 2017 NSR Porsche 917 Rules discussion Reply To: 2017 NSR Porsche 917 Rules discussion

#10584
Avatar photoBarkingSpyder
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    Sample Tuning (with expert help) that has produced multiple low to mid 4.1 s
    — Appx 40:f/60:r weight distro
    — Appx 4.5-6gm ballast – appx 3.5-4.5g in the center magnet holes in the pod, 1-1.5 on the nose to keep the guide from porpoising in the hairpin.  Spread the ballast around. Too much weight on the nose produces a pendulum effect with hard tail whip in esses and hairpin.
    — Cabin tub is close to the pod and can interfere with certain ballast methods and locations.
    — Solder tabs on motor need to be very flat; wires should not be on top of motor
    — Open air-ride channel has less hop in turns (than if filled with o-rings);  Supergrips
    — 20k motor   — Gear-ratio: 2.6 to 2.7  — Rear wheel RPM: appx 7,000
    — Tight pod (reduces hop)
    NOTE: The torquey motor and Supergrips still combine to result in minor hops under a heavy or quick finger.  Motor may climb out of pod during impacts under acceleration.

    "... get on your bad motor scooter and ride!"
    Sammy with Montrose

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    BarkingSpyder

    At 4-years old in Pensacola I repaired my steering linkage on my Ford Pedal-car. Dad later converted this car to a Blue Angel with ailerons and elevators with a working "stick/yoke"; the rudder was controlled by the steering wheel. I like all motorsports - I grew up going to a NASCAR Feeder track with Sportsman and Modified classes, and was lucky to attend drag races in 1970 at Orange County Raceway. My first solder-iron was a Christmas gift at 9yo; I modified T-Jets to be AFX spec before AFX Cars were in local stores. I rebuilt a few tractor & car (SIMCA) engines plus transmissions by 15yo (I still have my ring-compressor and valve spring tool) I am a former mountain and road bike geek & perennial sound engineer. Struggling guitar hobbyist and Amp "tweeker"