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it also depends on a dyno and the ramp rates, if i tune something the Dyno Dynamics 2wd dyno anything over 210rwkw i would prefer to strap down, but on another mates Mainline dyno i can get away with having 300rwkw cars on there with no straps.

chalk and cheese, the dyno operator should know his dyno well enough to make judgement.

This thread reads like an advertisement for Hub dynos! I used to work next door to a 2 wheel dyno and every car was anchored at the rear by a massive chain fixed to a staple in the concrete floor.

The four wheel dyno i was on recently uses straps each side to keep the car central on the rollers - i would have thought any down force was very minor.

  • 3 weeks later...

yeah same setup on the dyno I normally use. the front straps minimise side to side movement, and the straps at the rear stop it movin forward too far.

its not that it is holding the car down, the straps stop the car moving further forward. and forward = up on the roller

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