Here's my 2015 570SP trail build so far, I have made a lot of changes and upgrades since I picked it up last fall. My main goal with the Ace was to keep it reliable, maneuverable and tough. Most of you guys know I'm in a wheelchair and have MD so having a capable machine to climb through/over what ever is in front of it and making it back to the parking lot in one piece is very important.
So first things first I got a set of Suregrip hand controls for it and they where easy enough to use and really simple but where pretty sloppy and just kinda weird to use as a brake and throttle it did the job but left a lot to be desired so I set it up so just the brakes worked with the hand controls and used the gas pedal with my leg but the throttle spring wore me leg out really fast. The next challenge I ran into was the steering even though it had EPS which made it a lot more easy to steer I found it hard to steer on twisty trails with the 2.5 turns from lock to lock steering, compared to a regular ATV that is .5 of a turn lock to lock it just seemed ridiculously slow to me for a trail machine. I started thinking maybe the Ace steering system would be better off set up like a traditional ATV with a .5 turn lock to lock steering ratio and a handle bar which I find more comfortable any ways. After lots of messing around and trying a Scrambler 1000 type set up that gave me way to much acherman angle I scrapped it and made a mini "swing set" type system that is common on desert trucks and that was able to get the steering angles back within OEM specs it also gave me the .5 turn lock to lock I was looking for, it also ties the front A-arms together with some cold rolled 3/16 steel so you will never rip a front A-arm off.
Next was setting up some handle bars, I ordered up some Protaper handle bars, risers and a Motion Pro ATV twist throttle kit. I made a aluminium adapter plate that attaches to a dragon fire quick release hub so it can be taken off easily, I also found it hard to get to the key and 2/4WD switch when fully strapped in the 4PT harness so I got a weather proof box and relocated the 2/4WD switch, ignition key and toggles for LED lights to the handle bar hub so its really easy to get at. I tried it with the typical dirt bike handle bar set up but dirt bike bars are pretty wide for inside an Ace so I cut them down a good chunk and added mountain bike steer horns lol what ever works right and was like an air craft yoke and was pretty comfortable and real adjustable so I'm going with that for now.
So far its working out much better for me given what I have to work around, the twist throttle is really light and smooth, the steering is much faster and the Ace turns much better just like a regular quad but I still would like more power out of the electric power steering and don't really like "progressive" EPS steering Polaris uses, a constant steering rate is more ideal for me. I'm thinking about building a full on electric hydraulic power steering system for it soon as I don't think the Super ATV EPS is any stronger it is just non-progressive.