# AEM'S SHAFT ON DYNO **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [November 7, 2011, 6:05pm UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172 "2011-11-07T18:05:29Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![BoOsT-HuNgRy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost-hungry/32/5721_2.png) [@BoOsT-HuNgRy](https://forums.speedlife.net/u/BoOsT-HuNgRy)\ **Post date:** [November 7, 2011, 6:05pm UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/1 "2011-11-07T18:05:29Z")
I thought this was interesting and was curious to know what your guys opinions and thoughts were about AEM’s shaft on dyno system. HOW IT WORKS AEM uses a set of laboratory-grade strain gauges inside of a supplied slip yoke to measure Torque at the driveshaft. Essentially, the Dyno-Shaft slip yoke becomes the sensor for measuring driveshaft Torque. This is combined with a driveshaft speed sensor to precisely measure the rotational speed of the yoke to determine RPM. The combination of real Torque and RPM readings allows the Dyno-Shaft to output Torque and Horsepower numbers as accurately as any dynamometer but in a more useful setting, and eliminates all of the inaccuracies associated with accelerometer based systems. The data broadcast device (Controller) for the Dyno-Shaft yoke is non-contact, does not have slip rings, does not require batteries and is maintenance free. This Controller installs over the transmission tail shaft housing and allows information from the Dyno-Shaft to be transmitted via AEMnet (AEM’s CAN-bus communications network) to a data logger, AEM or other programmable engine management system, or custom dashboard via a single connection. ![http://2475-streetlegaltv.voxcdn.com/wp-content/blogs.dir/10/files/2011/11/IMG_0860.jpg](http://2475-streetlegaltv.voxcdn.com/wp-content/blogs.dir/10/files/2011/11/IMG_0860.jpg) links: [http://www.streetlegaltv.com/features/sema-coverage/sema-2011-aems-dyno-shaft-on-car-dyno-and-boostwideband-failsafe/](http://www.streetlegaltv.com/features/sema-coverage/sema-2011-aems-dyno-shaft-on-car-dyno-and-boostwideband-failsafe/) [http://www.aemelectronics.com/files/pr/102811\_Dyno-Shaft/Dyno-Shaft\_PR.html](http://www.aemelectronics.com/files/pr/102811_Dyno-Shaft/Dyno-Shaft_PR.html) VIDEO ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [November 7, 2011, 6:23pm UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/2 "2011-11-07T18:23:47Z")
This could likely be used as an excellent realtime closed loop calibration input (like a wideband O2) but will likely be mostly realized as a HP GAUGE in shitty underpowered ricer cars. ---
**Author:** ![Onyx\_Z32](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/onyx_z32/32/7581_2.png) [@Onyx\_Z32](https://forums.speedlife.net/u/Onyx_Z32)\ **Post date:** [November 7, 2011, 6:45pm UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/3 "2011-11-07T18:45:17Z")
Cool stuff :tup: ---
**Author:** ![Copper280z](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/copper280z/32/5464_2.png) [@Copper280z](https://forums.speedlife.net/u/Copper280z)\ **Post date:** [November 7, 2011, 8:55pm UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/4 "2011-11-07T20:55:03Z")
In my experiences with strain gauges, which is mostly limited to lab stuff in school, they’re pretty picky. Things like temp, electrical noise, etc messes with them, those are pretty abundant in a car. ---
**Author:** ![Spam16v](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spam16v/32/5287_2.png) [@Spam16v](https://forums.speedlife.net/u/Spam16v)\ **Post date:** [November 8, 2011, 5:56am UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/5 "2011-11-08T05:56:43Z")
A similar application is in regular use among cyclists for power output. Integrated into the rear hub, or into the crankset. ---
**Author:** ![Carnut](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/carnut/32/7590_2.png) [@Carnut](https://forums.speedlife.net/u/Carnut)\ **Post date:** [November 8, 2011, 6:54am UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/6 "2011-11-08T06:54:48Z")
Interesting. I’d be interested to see how they hold up over time. Great idea though. I think a lot of tuners will try them out but I think what Newman said is also most likely the case. ---
**Author:** ![NoSkillz](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/noskillz/32/5606_2.png) [@NoSkillz](https://forums.speedlife.net/u/NoSkillz)\ **Post date:** [November 8, 2011, 9:21am UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/7 "2011-11-08T09:21:08Z")
[http://www.land-and-sea.com/rotary-shaft-dyno/rotary-shaft-dyno.htm](http://www.land-and-sea.com/rotary-shaft-dyno/rotary-shaft-dyno.htm) had one of these on our Hummer at work 4 years ago. Cool stuff till it failed! ---
**Author:** ![MPD47](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mpd47/32/7383_2.png) [@MPD47](https://forums.speedlife.net/u/MPD47)\ **Post date:** [November 8, 2011, 10:40am UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/8 "2011-11-08T10:40:07Z")
I wanted to umm end the narrator of that umm video ummm for the way he ummm couldn’t umm form a complete umm sentance umm without using what was that word… oh… UMMMM ---
**Author:** ![BoOsT-HuNgRy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost-hungry/32/5721_2.png) [@BoOsT-HuNgRy](https://forums.speedlife.net/u/BoOsT-HuNgRy)\ **Post date:** [November 8, 2011, 11:35am UTC](https://forums.speedlife.net/t/aems-shaft-on-dyno/218172/9 "2011-11-08T11:35:27Z")
yea i know what u mean lol but its the only current video up atm