I built a 850hp blower motor last winter that went in a 29 Warlock World Class. Installed a drive guardian and a XR drive. About his 3rd trip out with the boat, it broke a tooth off an upper gear while getting on plane. Not blaming the DG at all, I think they are a wonderful piece, but the gears can still break. I doubt that he was anywhere close to max torque when the gear broke, therefore the DG could do nothing for him.

On a brighter note, I installed a new XR upper and he beat the snot out of it the rest of the summer with no failures.

850HP is an amazing nummber for an XR!
I will not do so much.But i think it can handle the 662Ci very well for some years!
Michael

I believe thats why they sponsored 4-5 raceboats. Ours being one of them. Whats the difference between a year with DG versus a year without DG and running one engine with one engine without, BUP? We ran the same schedule, props, engines, competition, ect.

Wear, yes. We still had wear on our gears too. But the pits, dents, chunks etc were all gone. As we stated at the beginning of the thread, it won't make gears last forever and it wont make a Bravo an M6, but in our case it took a ton of abuse out of our setup. Instead of rebuilding every 3 races, we're at once a year (6-7 races).
The harder you run, the more benefit you'll reap from the DG. Sounds good to me :D

We wouldn't leave the dock without it. Have had tremendous success running the DG on our Bravo set-up in the race boat. No more twisted shafts. No failures of gears.

Hello
I have mount my engine yesterday and use alignmend tool from merc to adjust!
I can pull in and out of the Dg with one finger
Today i try to mount an XR new out of the Box but i get no chance to mount.
Can pull maybe one inch in the DG and end. I checked 3 time if all is clear with adjustment and found nothing wrong!
I then look for the inner diameter of the DG and found out it is nearly 1mm more (put 26,6mm nut in) than the merc tool(25,7mm) to adjust the motor!
I am pretty shure that the adjustment from the engine is the problem as with merc tool that is so small its a toygame to adjust the engine right!
what way have you adjust your engines with DG?????#
Hope i can get fast help to make my boat ready.!
Michael

We use the Merc tool and an old input shaft to double check.

Alignment with merc tool was perfect!I can hold with one finger and slide in and out!
But new drive will not fit.No wonder as there is a diffrence from 1mm from tool to DG!
Problem is i have no old shaft in fast time here! real a problem for me know!****!
Michaelhttps://cimg1.ibsrv.net/gimg/www.off...b7c0d06058.png