I've got my horses hitched to this wagon too..

OBD adapter should be in Monday. I haven't ever used "smart phones" but have gotten one off Ebay for 30 bucks and been playing with Torque Pro the last couple of nights. "Speed" related data won't be available without a data plan since it uses GPS tracking for that. (Educated guess right now)

The phone I got does have wifi.. I do have a AT&T wifi system also battery powered.. so might be able to do a few runs with it in the car and get some times from it that way.

Looks like it also does data logging.

Also bought my adapter on Ebay.. about 14 bucks and US seller with warranty. Already have a PC bluetooth adapter and this comes with some PC software that might be worth looking at.

Here we go..