1/10 gearing question

[Jamie James]

Just wanted to double check.

I am running the stock spur and probably a 13.5T Viper motor.

I was thinking around the 25T- 26T area for a pinion. Sound about right?

It's been a long time since I ran 1/10....lol

[YDBD]

I'm running the stock 21 pinion, we have a very tight indoor carpet track and it's plenty fast with a 13.5T BL...

[Gene]

I'm running a 12.5t (odd-it's a trinity motor) and 28* of timing at the upper end of the rpms. I use a 26 tooth pinion on a larger track. Temps are good and has enough top end down the straight.

[Jamie James]

True, the track I'll be running at is on the smaller side too.

Here is a crap vid...bunch of meatheads on the track....lol..but you can see the size/layout.

http://www.youtube.com/watch?v=6KNBbzK1wyk

[MantisWorx]

im running a 8.5t with 50* of boost up top,i am using a 24t pinion which puts the FDR around 8.3 motor temps stay around 115* keep in mind guys that the BL motors are not like brushed ones with gearing , you will get more TQ by gearing up, doesnt matter if its a short track or not, gear up until you find the sweet spot with temps. i would say start a 13.5 non timing around 29t but i bet you end up at 30/31 ish. its hard to break tradition with gearing but , if you gear a BL motor too low it will actually run hotter and draw more amps. the S10's gear ratio is 2.437 so you can do the math!

[Jamie James]

Is that the optimal FDR for the Caster 1/10 ?

When I enter my info into an online gearing guide, it's telling me 28/80 is a FDR of 6.96 and that it would be over geared by 0.57%

That's the closest it gets to perfect with the 80T spur.

[MantisWorx]

there is no perfect ratio, 28 would be a good baseline but if you are not running boost or turbo you would be able to go quite a bit higher than that. i can run an 8.5t with a 26t non boosted all day long. start at 28 run about 2 minutes and temp the motor, if its around 120* go up one tooth and you should be good. BL motors dont like to "wind out" there is a point where you will gear up and the motor will actually run cooler!!

13.5 non boosted we run at 4.5 FDR on touring cars with no issues! buggy tires are bigger so the roll out is different keep that in mind.

[Jamie James]

Ok.
So I had my Caster 1/10 at the track yesterday for the first time. Day went ok.

Positive things :

1. It was more durable than I thought it was going to be. I didn't have a lot of big crashes, but it didn't break in what I would call average impacts. I was most worried about the front shock tower mounts.

2. It handles great. The shocks are nice and smooth and pretty consistent. It jumps nice.

Negative things.

1. The slipper and diffs as we all know. I was only running a 13.5 and I could not get the power to the ground. I ended up buying a set of Blitz slipper pads that helped in that area but the diffs were slipping. It felt WAY slower than my B44. I know I had a 10.5 in my B44, but my S10B was SLOW. Any hard acceleration would produce ugly sounds from the drive train.

I was geared at 26/80 then went to 28/80. I was still slipping. I had little to no bottom end and very little top speed. Looks like I'll have to either go to gear diffs or use AE parts.

Here is the track. The layout yesterday was a little different, but you get the idea.

http://i58.photobucket.com/albums/g272/suzuki_02/newlayout.jpg

[YDBD]

I tend to think you were geared pretty tall for the 13.5 thus no low end and the slipper and diff could never hook up. what were the temps of the motor/center dif/rear dif? maybe gear down to 23 and boost if you can...until you get the upgrade stuff..

[Jamie James]

Even with the wheels held off the ground, it just never got up to speed. The tires wouldn't even balloon up. If I was geared too tall it would take longer to get to top speed, but once there it should be fast.

I don't get it. Seems like it only getting half throttle. All my radio settings are correct and everything. :confused:

[MantisWorx]

take the pinion off and make sure the car rolls free, maybe something is binding up. i think you were geared right with the 28 i run a 24 with an 8.5. what speedo?

[Jamie James]

I did that. It rolls free. I'm running this ESC until my other Viper comes in. I tried a different sensor cable too.

(second page)
http://www.casterracingusa.com/forum/showthread.php?p=59195#post59195

It's an Orion Vortex Race Spec

I told a friend before the quals started that i was not going to push too hard because I don't have any spare parts. After my first qual he says to me "wow, you weren't kidding about taking it easy."

I told him I wasn't...that's all it has. I have not raced 1/10 in about 1 1/2 yrs. I was using the same speedo with an Orion 10.5

I knew the 13.5 would be slower then the 10.5 I used to run. Is it really that much slower?!?!

It didn't feel much faster than a silver can.

I have a 13.5 in my 2wd. It is WAY faster than my 4wd.

[MantisWorx]

so your not boosting right now?

80/28=2.857
2.857*2.437=6.9 FDR thats high unless you are boosting, you need to be in the mid/high 5's for a 13.5 non boost.

try a 32 pinion for a few laps and see what happens. that puts you at 6.09. as i keep saying a lower ratio does not give you more punch on a brushless motor its like spinning a big block stroked 500cu in motor 10k rpms!! BL motor create instant tq, they dont like to wind up like brushed motors.

[Jamie James]

Will a 32 even fit with the 80T spur? I'll stop on my way home later this week and grab a some different sizes.

Thanks

[YDBD]

don't know, I'm running the stock 21 and it's plenty fast with a 13.5 (cheap turnigy BL) with and temps about 150-160 after 10-15 minutes and that's a 9.28 and I keep up with everything else on the track which doesn't have long straight......heres a vid...

http://www.yellowdunebuggy.com/images/SniperDF.wmv

[MantisWorx]

go up about three teeth and i bet your temps go down! i run 8.3 FDR with boosted 8.5 and my temps are about 110*! i know it sounds crazy but try it and see, your not going to burn the motor up in 3 minutes!

[YDBD]

tried a 23T pinion last night for about 3 minutes...hit 165...didn't want to go any higher.....went back to the 21 and ran for the rest of the night peaking out at 161...

[MantisWorx]

man thats crazy your FDR is 9.3 i run 8.3 with my 8.5??????

[YDBD]

True, but we are on an extremly tight and high grip carpet track, there is no slip with the Caster tires at all and hardly any full throttle and lots of brake tapping...I do remember running in the high 10's FDR with my DF-03 and the 5700kv...

[MantisWorx]

Ahhhh carpet, that the difference, i forgot about that! im running 11.5 FDR right now with a 4.5 but on loose dirt!

[YDBD]

yup all that grip is harsh...but fun!!