Driveshaft weight reduction

[Vekke]

Effect of weight savings are greater the diameter of the rotating diameters is. That said the biggest savings in rotating masses come from:
1. Lighter tires
2. Lighter wheels
3. Lighter flywheel
4. Lighter brakes
5. Lighter prop shaft.
6. Lighter engine components
List might not not exactly in correct order, but pretty close. So if you want most bang for your buck calculate the costs in that order. kg are always kg but if they are rotating its more important.

[steve05ram360]

Due for tires in about 1000 miles (109k on them now) Planning on going up 1" in diameter. Unfortunately that will also bring back 20# of rotating mass I shed previously. Reason for the bump? Reduced RPMs...

I'd previously run this size tire and while running it (also an AT tire), was regularly getting 21~22 mpg often. With the current size tire and before all the updates, I was happy to get 20 and was generally in the 19-20 mpg range. Time will tell if it is a good choice or not. The tire has a 60 DAY return policy since it is a new tire to the market. Hope I don't have to leverage that.

Also, FWIW, after the bet was finished I went back and fixed 2 areas of the tune that I found needed to be fixed. 1st tank after that gave my my 2nd best tank ever @ 23.257 mpg (vented tank so always filled to the fill neck). And that was not a 100% max effort (hit mid 60's on freeway 2~3x). Last weekend I tweeked it again for IAT compensation below 80*f and could easily feel the SOTP change in power (took 2 downloads to get it right). Attempting another 100% max effort but have already been thrown heavy rains & winds so who knows now. Tank still looks awesome. After that... soon, back to aero mods under the truck.


edit: Also, to re-state... before all these mods, I managed 23.00x mpg just 1x on those 1" taller tires, now I have 5 tanks in the last 6~7 weeks.