Hello All,

I recently purchased my first brushless motor. A Novak GTB with a 4300 motor. I run it in a Losi XXXT which has been converted to run EDM on a carpet oval. The run line is 150 feet.

I really thought when I put this brushless motor in my hotrod It would blow the wheels off of my buggy, but it has been a bit of a disappointment to me. No matter what I try to do it does not seem to have the QUICK acceleration I thought it would have, or the overall RPM. I have not been able to practice and experiment nearly as much as I would like to, so any ideas out there that might help me find a better ballpark to start from, it would be greatly appreciated.

People at the track I run have suggested gearing up, and giving the motor all it can handle. I am starting to think this is part of my problem, but would appreciate any suggestions someone might have.

I am running a 76 Spur(was told go as small as you can on this, and then gear up on the pinion as much as you can. Last race out I had a 32 pinion in it, and it was OK, but sluggish off the corners, and not ballistic at all down the straight aways. I have attempted to go lower on the pinion, but seemed to run out of speed on the straight aways when I did that, and lap times were slower for the most part. (Do not know if maybe I did not go low enough?)

I figured my current final drive ration at 5.77 which seems like an awful LOW number. I am not basing that opinion on anything except for what I saw on Novaks web site. On a Novak website they suggest 8 as a final drive ratio to start with a 4300/10.5 combo. To get to 8 with the spur gear I was using I would have needed to have a 23 pinion gear in it. DOES THIS SOUND MORE NORMAL THAN WHAT I HAVE BEEN RUNNING.

The tires we are running are small carpet foam tires with an approximate diameter of 2.25 inches.

Should I be looking for a specific FINAL DRIVE RATIO for this motor I am running? How much of the other stuff(car,tire size, etc...) would affect what Novaks suggested starting FDR for a 4300 brushless is?

With the FDR being about the same, would it be an advantage to have a larger spur and smaller pinion or vice-versa?

I am running the GTB in mode 5, and on the motor was told to turn the timing pretty much all the way up, which up or down I have not been able to tell that much of a difference.

Sorry for the long Post, but wanted to include as much info as I could to hopefully allow someone who is familiar with Losi and Novak products to hopefully offer a opinion, and help out this sluggish dog.

Thank You.

Your way under geared... We run touring car oval (6 cell) but with rubber tires... Rubber tires are kinda hard to measue but they are aprox 2.5 inches and with those I run a final of around 5.1 to 5.3 with a 10.5. Keep gearing up until it slows down or gets hot...160 degrees is about as hot as you want.

When you say WAY under geared are you saying instead of a FDR of 5.77, it should be higher than this or lower.

If it is lower I am in trouble, because with a 76 spur gear and a 34 pinion, I barely have any more room to put in a larger pinion. I simply run out of adjustment to move the motor back.

If I am not mistaken to lower my FDR from 5.77 to say the 5.1 to 5.3 you are talking about, I would need to put in a larger pinion, which I physically can not do.

Thanks for the reply.

Also, as far as temperature, I have never seen the motor get hotter than 110 on the motor or the ESC. I have always assumed that putting a larger pinion on with everything else being the same the motor should run hotter.

Novak says the motors should run between 150 and 170 for the best performance.

Thanks for the replies so far, but what I need to know is what do I need to do to get the motor to reach 150 degrees.

It seems obvious to me the motor is not working hard enough, hence not getting hot enough, hence I am not getting as much out of the motor that I should, but I have not figured out what I need to do to get it to do this.

I run Losi and the internal drive ration is 2.43:1. The transmission came from a Losi XXXT.

The associated B4s that most others are running have an 2.6:1 drive ratio. It seems pretty obvious to me the B4s have more punch than I do.

Do I need a transmission with a higher internal drive ratio so I will not run out of adjustment with my spur gears and pinion gears?

Oh, and getting a B4 is not an option. I have too much invested in Losi stuff to go that route to solve my problem. Out of 15 to 20 of us there are only 2 or 3 that are running Losi. There is probably a reason why.

Well, it sounds like you may be out of luck unless you can get the final drive ratio closer. If you can not add more pinions, you may want to crank up the timing up on the motor. Most tests have indicated that turning up the timing will give you more RPM, so you would want to gear that motor lower. Other than that you could run bigger tires. I am not really familiar with the XXX-T transmition, so I am not sure if you can change internal gears or not.

It sounds to my like your gearing is way off. Read Novak's recommendations on gearing. You can download the instructions for the 10.5 from the Novak web site and it has gearing recommendations.

One thing to remember...The ESC set-up sheet gives you ratios for trucks and buggies with truck or buggy tires which are quite a bit bigger in diameter than most foam tires. Can you go smaller in the spur gear? Then you could throw a little bigger pinion at it.

Can not go smaller on the spur gear. 76 is as small as they go for the Losi I run. The largest pinion gear to fit in is a 35 which leaves me at a FDR of around 5.77. I run out of adjustment to go any larger than 35. I have tried taller tires, but car was a little more unstable, although I did not attempt to adjust suspention to maybe compensate for the taller tires. I might go back to trying something with that.

It is sounding like the old, This car WAS NOT designed for I am doing with it.

I am still convinced the associated B4s have a little extra I seem not able to get with mine. I will keep working at it.

Thanks all for the input, and advice. It is much appreciated.