Question Guys. Same track, same size tire. Do I gear up or down when
going from stock to 19t??????
Thanks Richard

sounds strange but you add more gear, larger pinion.

Wow. Ok. but in open mod you would gear down??? (smaller pinion) :confused:

sounds strange but you add more gear, larger pinion.

Really, How much? For example say I,m running a 33 pinion 104 spur and 2.25 tires which equals a 2.24 rollout in stock. How much of a change?

I found this over here.
http://www.hobbytalk.com/bbs1/showthread.php?t=119093&page=58&pp=15
Witch tells me gear up around 4 teeth. but I really don't know

"there was no real formula I was just giving some ball park guidelines this way if you travel around you can get close. There are a lot of factors in determining a correct rollout. If you run outside you have to worry about temperatures. Also how sweeping or tight the turns are, banked vs flat track, asphalt vs concrete vs carpet, how bound up or free the car is are just some things that come into play.

190' - 2.25
180' - 2.15
170' - 2.10
160' - 2.05
150' - 2.00
140' - 1.95
130' - 1.90
120' - 1.85
Go up about .25-.30 points for an Epic 19T
about .40 point or more for a Ti 19T

For instance on our apshalt track with a runline of 268' you would think you would need to run about a 2.60 rollout but it wont work, Most run between a 2.25-2.35. Many factors play into this asphalt surface, warm temps outside, long sweeping turn so you are in the turn for a long time puts the motor under more stress."

Really, How much? For example say I,m running a 33 pinion 104 spur and 2.25 tires which equals a 2.24 rollout in stock. How much of a change?

Lee if you are running that gear at HW in stock you would have to add 7 teeth to it to run what the top 19t guys run.

Lee if you are running that gear at HW in stock you would have to add 7 teeth to it to run what the top 19t guys run.

LOL no no no not at HW Thats the rollout I ran at Minnreg last weekend :p My highly guarded and super secret HW gear is 40 pinion 100 spur and a 2.25 tire......................OOPS
Did you go to Stricklands yesterday?

Really, How much? For example say I,m running a 33 pinion 104 spur and 2.25 tires which equals a 2.24 rollout in stock. How much of a change?

We run a 2.20-2.30 in stock at Classic and most run Epic D5 19T's in the 2.50-2.60 range

So. Guys. Lol Bottom word. Gear up for 19t and down for open mod?
Is that right?????????? Thanks again Richardt

Hey Richard glad to see you here on Hobbytalk.
Andy

Hey Richard glad to see you here on Hobbytalk.
Andy
Yeah. You too Andy. Good thing we didn't drive to Racers Haven on Saturday.
It got rained out. :( Richard T

I'm currently running 5 cell 19 turn at my track and was going to switch to 4 cell stock. My gear now is 31/104. What should I change my gear too for 4 cell stock?
Thanks

Can't tell without more info. what is the surface and track size (runline). what is the 4 cell stock record?

carpet. We currently do not have a 4 cell stock class. 19 turn record is 62 laps in 4 minutes.

So. Guys. Lol Bottom word. Gear up for 19t and down for open mod?
Is that right?????????? Thanks again Richardt

Yep
to continue my post above, at our track 185' runline some basic rollouts are:

Monster stock - 2.20-2.30 range
19T - 2.50-2.60 @36 degrees
Mod - 8x2 (10 amps) - 1.55-1.65 range

I'm currently running 5 cell 19 turn at my track and was going to switch to 4 cell stock. My gear now is 31/104. What should I change my gear too for 4 cell stock?
Thanks


Your running 5 cell in 19t no wonder your so fast!!! :)

oops...let my secret out......lol

So many variables...
24 or 36 degree's, 2 or 4 magnet, Ultra bird (FB-6 magnet), Chameleon (sp?) Anything goes??? Lot's of things to consider here, but in general, EROCK1331 is speaking of a ARCOR motor, and I concur.

Later, Bret

Yep
to continue my post above, at our track 185' runline some basic rollouts are:

Monster stock - 2.20-2.30 range
19T - 2.50-2.60 @36 degrees
Mod - 8x2 (10 amps) - 1.55-1.65 range

That's what I looking for. Thank You erock
I'm ready for Hotrod Hobbies next week. Two cars, Two classes
19t and mod 8x2. Hope I bring home the mod car in one piece. lol :)
Richard T

Mod? Uh oh? How about Kingsburg Sat Richard??
Andy