Gearing question

[jimny82]

Hi, in my Schumacher Cougar SV2 I'm currently running 8.5T motor with gearing set to 83/23 or 24 pinion (can't remember which). If I switched to a 76/28 or 30 set up, I understand that I will loose a bit of acceleration and gain a bit of top speed, but does anyone know if this will be quite drastic or just a slight change?
Thanks

[chrispattinson]

Moving from 83 / 23 to 76 / 28 is a drastic change.
You effectively have a delta of 7 pinion teeth. If keeping the same motor, I have never had a delta of more than 3 pinion teeth.

[mattr]

It'll be a massive change, and you may cook your electronics.

Though i can't understand why you'd want to, an 8.5 in a car like that shouldn't run out of speed anywhere reasonable. Or are you trying to blunt the acceleration for some more control?

[jimny82]

Hi Chris. Ok thanks. If I'm looking for bit more top end speed and not so crazy acceleration (as it is at the moment), is there a gearing ratio you would recommend me trying?
Thanks
James

[jimny82]

Hi Matt, yes ideally blunten the acceleration a bit, as it seem quite 'skitty' having such punchy acceleration at the moment, as can be hard to control. But maybe its just my driving needs improving

[mattr]

Thought that might be the case

Few suggestions:-
Turn all the toys off, no boost, no timing, no nothing. Just run the motor as is. Even remove the physical timing on the endbell.

You may even have some limitations available in your ESC to restrict power on start up (current limit IIRC)

Play with transmitter settings. You can either cut off the top 20/30/40% of the throttle (EPA) or change the response, think it's called curve on mine (may be exponential). Means that 50% trigger is only equivalent to 30% throttle, sort of. Blunts the initial kick off the line. You'll still get full speed with exponential/curve, but lose a tiny bit with EPA.

Slower motor (maybe 10.5) then as you get better turn the timing and boost up, you should be able to get almost back to 8.5 performance eventually, then pop your original motor back in and start turning the wick again.
You can probably find second hand or cheap motors for 30 quid. Hobbyking/club/eBay would be good places to start.

If motor temps are ok now, i'd not be doing much on the ratio front, maybe a tooth up/down on the pinion, or 3 each way on the spur. At most.

[chrispattinson]

I've been looking through my setup sheets, and with a Thunder Power 8.5, I would run a 25/76 when used, so thats quite a move away from where you are at.

Your gearing needs may vary considering track, and motor specifics.

You can see gear charts on page 42 of your manual. If you dont have a manual, you can see a pdf of it here:

http://www.racing-cars.com/images/Te...sv2_manual.pdf

[jimny82]

The crazy thing is that since unboxing the (Speed Passion V3) motor and ESC I haven't even touched the tuning gizmo that comes with it, so I think I'm running it as standard already lol. Excuse my ignorance but I don't know what the physical timing on the endbell is. I've just come back into the hobby/sport from a ten year gap where I was used to brushed motors and NiCad batteries , so the power delivery of these new set-ups is quite an eye opener .
To be fair I have been running on quite a lose surface, so I think I need to get down to my local astro track where I should get a lot more grip, and I may find I can control the acceleration better.
Does the 83/23 or 24 gearing sound about right for average driving style/capability?
Thanks for your help and knowledge Matt!