Dyno dreaming

[JimmyC]

I am starting to use up all my napkins making my own Dyno for the Pinz. Pull of the back wheels, bolt on some hydraulic pumps with a back pressure valve and some way to cool a lot of oil.

Problem is the wheels turn so slow compared to design pump speeds. Maybe a torque hub with a planetary gear box?

[kdiqq]

I've seen a lot of homemade dynos and some really nice chassis dynos that hook up to the rear wheels. The big challenge you have is the Pinz has independent suspension and, unlike a car, it gets REALLY positive camber when unloaded. Whatever you affix to the rear wheels will need to have some float to it to accommodate it.

Let me know if you want any models done up or anything! I'm proficient in Solidworks and it sounds like a fun project.

[JimmyC]

I am thinking that independent suspension and camber will not be a problem if I use two pumps, one on each side, connected only with hose.

I am not sure how I could keep the whole pump from turning. I was thinking just a long base, but itwouldhave to be big. Maybe tie into the brake backing plate?

[GRCameron]

If you made an adapter that fits the hub, the pump could be prevented from rotating using a long (4 ft. or so) reaction bar that rests on the ground ahead of the hub. Tie the bar to the ground or somehow restrain it so that if you ever went into reverse the bar would not swing rapidly like a giant hand on a clock.

[krick3tt]

Drive close and put the bar under the garage door.

[JimmyC]

How about this: a torque sensor to put between the transmission and transfer case. You would have to baby it except in 4th gear but once you got to fourth you could measure engine torque. http://www.omega.com/pptst/TQ513.html

[undysworld]

How about this: a torque sensor to put between the transmission and transfer case. You would have to baby it except in 4th gear but once you got to fourth you could measure engine torque. http://www.omega.com/pptst/TQ513.html

Yeah, and it's only 2 grand. You guys must have a lot more $$ than I do.

[JimmyC]

I have been divorced for 7 years so have nbben able to save some up. Worst comes to worst I can dump my girlfriend before Christmas.

[Texas710]

Ha! Anything for the Pinz!