Diff oils...
 

I'm running with a rotated centre diff on my lsp - i.e. motor in front left opposite the servo.

On a 1515 2.5D 6s a123 mmm i'm not getting the acceleration I would expect.

I have 30k in the centre at the moment - Is this putting all the power to the front as the diff is rotated? Should I be running lighter fluid or thicker and lock the diff?

Confused!

I dont think rotating the diff will make a difference in the performance of the dif.

I'm not sure I understand the problem completely. Is it still just unloading all the power to the front wheels? ie.. pizza cutters?

If your not unloading to the front wheel then where whould the power be going. the 1515/2.5d on 6s is an animal. You should be able to take flight with that. COuld it be sub par batteries limiting you? SOme setting in the esc like a punch control or spool up timer or current limiter?

EDIT. I just noticed you said a123 6s. I was thinking lipo. Are you running at least 2p on the a123 cells? In 1p format they dont have the grunt to fuel that beast.

I was running in the dark so difficult to see but it didn't seem to have the speed I was hoping for. I think I'd set punch at 50% as a first try so I can dial this back...

It was running 6s2p A123 so batteries should be up to the job.

I'm just wondering if rotating the diff means the normal oil rules are swapped...

I.e. quote "normally using thinner fluid such as 5-7k in the center diff will send more power to the front wheels, allowing them to pull harder. At the same time, drive to rear wheels will be slightly diminished. The shortcoming is the overall acceleration will be reduced, as more power will be sent to the unweighted front wheels, while less goes to the rear wheels. "

Now as the diff is the other way around i.e. normal rear output of diff is driving the front wheel is my thick (30k) oil resulting in more power to the front wheels than the rear.

Should I be dropping down to 10k or less to get the power to the rear?

Rotate.
 

Personally I do not see how rotating the diff will change anything. The diff is a mechanical device that will operate the same no matter which way you face it. From my understanding a normal diff transmits more power to the side that has the least amount of resistance in order to keep things moving (hence spinning wheel off the ground effect). So the amount of resistance (or lack there of) on the front or rear diff will determine which one gets the most power. How will the weight of an oil change that theory?

There are diffs that claim that they can reverse that force and work in the opposite way sending more power to the wheel with the most resistance. I believe the 1/8 "Torsen" diffs claim to do just that. In their write up it states that there diffs transfer the power to the wheel that is not moving or shows resistance. So in theory that would mean that it puts more power to the rear wheels of most vehicles due to the heavier end of the truck/buggy, or whatever. Correct me if I am wrong.

Ok I get it now - lost the plot for a bit....

Will review in daylight and see how it does on the track at the w/e.

thx

rotating the diff will not send the power to the opposite wheels. It is purely a function of the grip Whichever wheel has the least grip will spin the fastest in a traditional 3 diff setup. flipping the dif wont change that.

Agreed - lost the plot....