Fastest Motor on 6s?

[roost]

Some data log of a Lehner 2240/7 on 6s pushing a savage xl around. Anyone else got Graphs? im interested in seeing what other motors on 6s put out

[RootzMan]

Originally Posted by TexasSP

You make a lot of assumptions again and again.

What assumptions? Assuming you don't know what you're talking about? I would have said that was self-evident.

Originally Posted by TexasSP

I have made my own tires, it is done quite a bit in the crawler/scaler world using other tires, cutting, then gluing.

When the vehicle in question is only going to do 3mph, cut'n'shut tyres are all well and good. I would never recommend this construction technique for speed tyres. Unless you really like to see spectacular crashes.

Originally Posted by TexasSP

Bigger tires make for more weight and higher rotating mass, thus robbing you of energy that could be put elsewhere.

It's true to say that, for a given construction, the bigger the tyre, the higher the rotating mass and that this will reduce the power available to propel the vehicle forward. It's not true to say that big tyres are bad. There is a trade-off and it's therefore reasonable to assume that there is a "sweet spot" somewhere along the continuum between 2" and 8". Where that sweet spot is will depend on the construction of the tyre and wheel. Foam tyres are generally far lighter than standard rubber and so the sweet spot will tend towards the larger sizes. That said, let us remember that the fastest E-Revo so far, used 5 1/2" tyres.

Originally Posted by TexasSP

Like I said, I did the speed thing, I know what it takes. I never implied it would be easy. I can tell you though that I never got anywhere using bigger tires and gearing for them.

You did "the speed thing"? Perhaps you'd be willing to share your performance. Just because you never got anywhere with larger tyres doesn't persuade me unless you're going to substantiate your opinion with facts.

Originally Posted by TexasSP

As for snellemin's posts I was agreeing on the points about motors and then adding my own about the tires. You seem to want to pick apart little things too much. Stop being so asinine about the whole thing.

Well, I certainly congratulate you on learning a new word. It pays to enrich your word power. However, knowing words isn't everything. You need to know how to put them in an order that reflects what's going on in your head. I suggest you practice that. As for the name calling, it now becomes clear to me why you were defending Brian's post. You think insulting strangers is acceptable. Well, let's hope you don't insult some one who's carrying a gun. Oh! And before you descend into a tirade involving statements about my Mother, I'm immune to such attempts as these really only work on Americans.

[lincpimp]

Man, you guys are really sh!tting in this thread....

I did some speed runs in a revo a few years back. My setup was bl with stock suspension and I was using the revo to test the effect of wheel balancing and tire taping.

My conclusions were as follows:

An unbalanced tire is a bad idea, especially if it is not taped either. Even at 60mph the out of balance condition was causing enough force to compress the suspension to its upward travel limit and let the tire leave the ground.

Taping helped, but balancing was the only way to get the vehicle to track smoothly. Pretty sure I was running a 1515 1d on 4s, geared high enough to get over 60mph with properly taped an balanced tires that would not grow (keep in mind tire growth increases the rollout, so you will go farther per tire revolution, thus faster top speed.)

Pretty sure the 1521 wil be the longest can motor that will fit an ervo with mods. I think 1521 on 6s with a sutable kv to do 45k - 50k rpm max with the correct gearing will be the best bet to get up to 100mph. Airflow mgmt will be critical, and I think a tire around 1.5" wide will be about right.

Limiting the suspension travel to the minimun you can get away with is critical. 1/2 inch of travel at the tire and a very smooth survace will yeild the best result.

I like the body you have rootzman, keeping air out of under the body is a good idea. You can cut the back out to aid air extraction as well.

[RootzMan]

Originally Posted by lincpimp

Pretty sure the 1521 wil be the longest can motor that will fit an ervo with mods. I think 1521 on 6s with a sutable kv to do 45k - 50k rpm max with the correct gearing will be the best bet to get up to 100mph. Airflow mgmt will be critical, and I think a tire around 1.5" wide will be about right.

My conclusion too. I seem to remember that, in order to fit it, I had to shave down the motor mount and grind the shaft down too. Then, with the gearing I was running, I had to accommodate a lower position for the motor. That was only possible by modifying the rear shock mount.

Not sure I'd agree with 1 1/2" wide tyres. That just seems a tad narrow to me.

Here's a body style I mocked up but never got further. If I were to go back to speed running my E-Revo, I think I may well take this route.

[TexasSP]

Originally Posted by RootzMan

What assumptions? Assuming you don't know what you're talking about? I would have said that was self-evident.



When the vehicle in question is only going to do 3mph, cut'n'shut tyres are all well and good. I would never recommend this construction technique for speed tyres. Unless you really like to see spectacular crashes.




It's true to say that, for a given construction, the bigger the tyre, the higher the rotating mass and that this will reduce the power available to propel the vehicle forward. It's not true to say that big tyres are bad. There is a trade-off and it's therefore reasonable to assume that there is a "sweet spot" somewhere along the continuum between 2" and 8". Where that sweet spot is will depend on the construction of the tyre and wheel. Foam tyres are generally far lighter than standard rubber and so the sweet spot will tend towards the larger sizes. That said, let us remember that the fastest E-Revo so far, used 5 1/2" tyres.



You did "the speed thing"? Perhaps you'd be willing to share your performance. Just because you never got anywhere with larger tyres doesn't persuade me unless you're going to substantiate your opinion with facts.



Well, I certainly congratulate you on learning a new word. It pays to enrich your word power. However, knowing words isn't everything. You need to know how to put them in an order that reflects what's going on in your head. I suggest you practice that. As for the name calling, it now becomes clear to me why you were defending Brian's post. You think insulting strangers is acceptable. Well, let's hope you don't insult some one who's carrying a gun. Oh! And before you descend into a tirade involving statements about my Mother, I'm immune to such attempts as these really only work on Americans.

No thank you.

[Rivermaxx]

Originally Posted by RootzMan

There was another guy who persuaded John's BSR to make up a set of big foams for his E-Maxx. They were narrower than mine and cost him a whole lot without much success.

That happens to be me I broke the current open wheel world record for that year(2009) and probably still the fastest e-maxx around so "not much success" is your opinion. How fast is your erevo on 6s? Id really like to know Vid or proof would be appreciated. Btw There was no other option for tires back then bsr made them for ~150 and told me to run them narrow. Should of made them wide or used traction compound because traction after 70 mph on that dirty track sucked for foam tires. Sorry for post digging but needed to defend my car lol.

[RRHobbydepot]

Any new updates? How r u keeping the front end down? I keep having unloading issues on both my personal vehicles.

[RootzMan]

Originally Posted by Rivermaxx

That happens to be me I broke the current open wheel world record for that year(2009) and probably still the fastest e-maxx around so "not much success" is your opinion. How fast is your erevo on 6s? Id really like to know Vid or proof would be appreciated. Btw There was no other option for tires back then bsr made them for ~150 and told me to run them narrow. Should of made them wide or used traction compound because traction after 70 mph on that dirty track sucked for foam tires. Sorry for post digging but needed to defend my car lol.

I am really sorry, Rivermaxx. My memory isn't as good as I thought. Please accept my sincerest apologies.

My Revo never fulfilled its promise, I'm afraid and is now enjoying a well-earned retirement with a Ballistic 8 and an RX8. It wasn't for want of power, grip or aero. My set-up skills were the real let-down. It was nigh-on undriveable. If you fancy a gander, here it is...

http://www.youtube.com/watch?v=w2p3IYbNms0

You live and learn!

Cheerz!

Rootz