# Son240sx Dyno Day - April 15th **URL:** \ **Category:** SON240sx Automotive\ **Created:** [April 2, 2007, 6:37pm UTC](https://forums.speedlife.net/t/son240sx-dyno-day-april-15th/105140 "2007-04-02T18:37:46Z")\ **Posts on this page:** 1\ **Showing post:** 42
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [April 11, 2007, 12:52pm UTC](https://forums.speedlife.net/t/son240sx-dyno-day-april-15th/105140/42 "2007-04-11T12:52:33Z")
> [@new toy](https://forums.speedlife.net/t/new-toy/12021/21): > > Sorry, Dan, I think I PM"ed you, but I won’t make it that day, I’ll make it to your next session, the one with TNC. > > Also, Nissan autos can lock it into 1st gear if the gear selector is shifted to 1, and the ratio will stay constant. Good to know but not always the right thing to do on a Dynapack Dyno. This would only work if the car was not making much power. The TQ multiplication through a first gear ratio would be pretty large. Assuming first gear was about a 3 and you are running through a 4.4 final drive your drive ratio would be 13.2. My dyno has a max TQ rating of 2,250ftlbs so a first gear pull would only work if the car was making about 170ftlbs of TQ or less at the motor. --- _[View the full topic](https://forums.speedlife.net/t/son240sx-dyno-day-april-15th/105140)._