Neu motor rpm speed question for BrianG

[rabosi]

Originally Posted by VintageMA

Lutach - I read a thread on another "reliable" forum (can't remember which) about a year ago by a really hardcore 1/10 on-road guy who was describing how the final drive ratio should be 1:1 with the rollout of the tires for highest efficiency of the setup.

............................

Unless I'm missing something, it seems like the weight of the vehicle could have a huge effect on the load to the motor (heat?) even if you have a 1:1 ratio. So there'd have to be a way to figure ideal power/weight to maintain desired heat level.

[VintageMA]

Originally Posted by rabosi

Unless I'm missing something, it seems like the weight of the vehicle could have a huge effect on the load to the motor (heat?) even if you have a 1:1 ratio. So there'd have to be a way to figure ideal power/weight to maintain desired heat level.

Like I said - I don't fully buy into the concept - but it does make some sense.

I guess weight comes into play the same way it does now. 1509/1512 for a buggy, 1515 for a truggy/mt, etc.

[VintageMA]

So I went out and tried the 6S setup with the 13/46 gearing running at about 40K rpm. I even turned up the punch control a bit on the MMM.

Results are that the temps were hitting up around 180* compared with around 150* for the 5S setup after 10 minutes of hard WOT running in a huge parking lot.

I will admit that the acceleration and startups were definitely a bit smoother, but this wasn't enough to convince me that for my driving style sticking to around 33-35krpm in my setups just seems to work best for me.

In a track situation with much more technical driving and only a bit of WOT I could see that faster rpm setups working very nicely.

There is no definitive answer here.