[thzero]

Originally Posted by Knez

well i didnt use those pink+yellow sping set up as my Flux Baja 5b will be between 6kg -7kg heavy, so i will not use them.
But maybe good for heavy loaded trucks.

I really don't think the setup you are using will work. The point of the dual springs is to have a dual-rate spring setup without needing dual rate springs which means that HPI could use existing stock without needing to create new (the big bore shocks are using the old Hellfire springs, which are truggy length springs) springs. The smaller spring is much heavier than even the red spring and is meant to help absorb the really large impacts. Unless you running short tires, or tires with flexible sidewalls, a 5B/5T/5SC conversion more than likely will never bottom out; not enough travel in the suspension! So _dv's suggestion of replacing the short spring with the spacer probably isn't a bad idea.

As a point of reference, fully loaded mine weighs 16.4lbs. Thats with a 5mm TCS TVP, the tranny, bulletproof diffs, flux motor mount, torq motor, 5S 5000mah batteries in a custom battery box, Mamba Monster, Spektrum receiver and HiTec servo both mounted in the plastic Savage servo/raido box without the lid, and lastly running 24mm Baja 5B/T/SC hubs on XL axles with ProLine 5B Badland front/rear tires on Proline 5B Desperado wheels.

Originally Posted by Knez

Well the thing is...DB are made to transfer the power. Well i didnt see no cups that can take bigger "DB ball ends" so there would be no point for manufaturer to make those bigger or thicker...but thicker DB in a longer truck like 5b is always welcomed in my .

Thicker != better. Not sure that a new dogbone was needed for the rear, probably should just have used the standard XL rear dogbone as that would have provided the space for bigger motors. Thicker just means more rotating mass. The longer dogbone does probably need to be a bit thicker to avoid flexing as I understand it; but then again not a mechanical engineer so can't say for certain.

Oh and there are larger cups, 11mm vs 8mm, for the XL suspension dogbones, but none that I know for the gearbox or the diff pinions.

Originally Posted by Knez

I am thinking to put 1520 or 1717 in this thing... any advice?

I have been running a "HPI Torq", i.e. rebranded 1515 as it fits in the standard Flux motor mount, but am switching to the 1520 in mine as I switch to a center diff setup. In either case you need a different motor mount or you need to grind out the Flux mount to accept the larger diameter motors; only like ~1 mm with the 1520, like 5mm with the 1518.