Because like everything motorsports, it's a balance. You reduce one (torque) and gain the other(horsepower). That's where you've seen the power figure climb. But if you have a hard ceiling, all you're doing is changing where the power comes in. And so, without more energy being used (watts-in to watts-out, or shaft output), you're still limited.

Changing to non magnetic screws doesn't reduce torque.

Have you tested that? If so on what?
I have two dynos that can but I never did that test specifically. Most of my stuff has been rotors and timing tests. It might be interesting. As you know there are some motors that don't have can long retaining screws.
One thing that is true. In almost every motor, peak power is at 1/2 of peak RPM. I have dozens of flywheel acceleration tests that show that. Then you run the car and see that your on track peak rpm is no where near the motors. That is where the gearing match to the motors torque curve comes from.
Here is a interesting note: The USGT fixed timing motor is offered in two forms. USGT spec which is 30-32 degrees of timing and TOUR spec which is 44-45. The TOUR motor shows more power by quite a bit. On a track it has a hard time beating the USGT spec motor. Reason is lack of low end torque due to overtiming.

Sorry if this has been addressed already...A couple questions regarding the new body rules coming at the end of the year. Will there be a requirement to run a body that has a recent history in racing? (personally, I think this would be a good thing to retain the spirit of the class.)

Been running USGT since crawling back into RC 9 years ago, since then I've considered that if a car can be bought at a dealership the body was legal for USGT. With the recent highend electric super cars coming to market how will this affect our options since no fully electric cars are currently racing in GT classes?

I don't have a dyno but I've seen the numbers from other people testing it. I'd be interested if you could confirm on yours. The motor screws aren't wrapped in the stator coils so shouldn't be able to contribute to torque. If simply having ferromagnetic materials outside the stator produced more torque, we'd be seeing aftermarket sleeves that you could install on the outside of the motor.

If the touring spec motor has more power but is struggling due to insufficient torque, that just means it's over geared. The torque curve in our motors is pretty much a straight line with peak torque at 0 RPM, and no torque at peak no-load RPM. Power is torque times RPM, so the power curve ends up being a parabola with the peak power at the half way point. If you gear the motor such that the average RPM in the midfield part of the track aligns with the peak power RPM, you shouldn't be lacking in punch.

Then how is it producing a stronger magnetic field? You can't gain energy in by changing a few screws.

Like another poster said, changing the screws reduces punch. Punch is torque. Torque comes from the field produced in the stator.

You can't get something for nothing.


I would be very interested in seeing the effects of a motor screw change, so we can see if the speculation amd rules change has validity... or if it's just magical thinking.

There are alot of mistakes in your response. Ferrous Metal screws disturb the motor's magnetic field by taking away a small amount of energy for themselves, not allowing all the energy to be used only to turn the rotor. Non Ferrous screws do not disturb the magnetic field, allowing the full energy to be used just to turn the rotor... No energy was diverted, resulting in full power to turn the rotor.
Furthermore, you can get more energy than you put in, contrary to popular belief, since you have no clue how much more energy is really in the atmosphere: science today has no clue what extra available earthly energy will be discovered tomorrow.....

Ferromagnetic objects outside the stator but within the EMF can dampen the EMF. Removing said obstruction is what makes it stronger. Same way that replacing high friction bearings with low friction bearings can "gain something for nothing".

I don't know why they said using non magnetic screws takes away punch. It should add punch.

These motors aren't heat pumps...

Amazing. Thinking you can get more energy out than what you put in. Physics and thermodynamics would like a word about that.

Perpetual motion machine, go!

And thanks for the laugh.

As I write this, I’m a few sheets to the wind, so forgive me mods, I’ll try to be polite as possible.

if your track requires you to run the USGT motor, and you’re one of those that paid to change the screws, swapped the bearings, had someone tune your sensors, to gain the upper hand, when you’re driving skills are what are holding you back… you’re a bloody arsehole (uk spelling hopefully will make it more polite). Accept that fact and bugger (uk) off

Unfortunately (IMO), I believe Eric Anderson said that ROAR is not planning on moving forward with this. I expect he or someone more knowledgeable than me will clarify.
One thing that aI am doing is sponsoring a $75 for the highest finishing non-hypercar and $50 for the 2nd highest st the USVTA Nationals at Apex Hobbies. I've seen a McAllister Mx-Stang and others do awfully well there.

I've had Bert on ignore for years, so I haven't seen any of his posts. Thanks for the laugh.