Gearing for XXX

[rcracer_xxxt_futaba]

I just bought a used XXX. Its full graphite titanium ti rods and ballstuds ect. But it didnt come with a manual :mad: :mad: I need gearing for a P2K and D4 11x2. It has the purple spur gear. I dont know anything about shock setup or gearing for a buggy. Im running red front springs with ornge poistons and 35wt oil. Pink springs with red pistons and 30 wt. Thats what it came like stock. Should I get yellow and ornge springs for it?

THANKS!

[digex]

If it has the stock spur gear, use 18 to 20 teeth on the pinion with the p2k. Not sure about the d4.

[rcracer_xxxt_futaba]

Igot the car used with the purple spur. I dont have any other spur gear excepted 88 and 87.

[Railman]

Go with the smaller spur gear. It will work better for overall handling...moves the motor foward. I've been running the 78 spur since I got my XXX & used to run it on my xx with a 2.60 trans years ago for the same reason. You need to keep the o.a. ratio in the range of 8.50 to 9.0 on a XXX with a P2k. These motors are designed for high torque. Try this, & if you don't like it, do the math for comparable ratios.

Spur Pinion Trans O.A Ratio

84 / 23 x 2.43 = 8.87
84 / 24 x 2.43 = 8.50

88 / 24 x 2.43 = 8.90
88 / 25 x 2.43 = 8.55
Just make a chart of the range of gears you want to run & keep it in your pit box. I do mine for on a computer spreadsheet for 6 different cars & trucks so that it's easy to change motors & cars without guessing. Once you have the chart you can keep notes handy for different motors, tracks etc. Any of these should be close if the motor is in good shape. :cool:

[ 05-06-2001: Message edited by: Railman ]

[rcracer_xxxt_futaba]

What about for my XXXT? Same trans.

I was running 84/20 and it seemed as fast as my XXXT. So should I try 84/23?? I want a gear ratio that has top speed and a little acceration, 1/2 and 1/2. What would be best?

[ 05-06-2001: Message edited by: rcracer_xxxt_futaba ]

[Railman]

Buggys should be a little faster than trucks on straitaways. They are a lot lighter, have less wind drag, and have less power loss in the tires. The taller gearing mentioned is what me & 3 my boys have settled on with the P2K. It runs cool with good performance. If you want to run something else, go ahead. Better to be low than high on gearing. Good luck.

[ 05-06-2001: Message edited by: Railman ]

[rcracer_xxxt_futaba]

I just ran my D4 11x2 at 84/20 and it FLEW! I'll get a 23 tooth pinnon for my stock motor but for now I'll run 84/20 with the stock.

[XXXER]

You should ask around your track, with mine, i have settled on a 21/82 ratio, but i have seen your track, and it is larger, so maybe a little bit more gears is what you need, all i know is that i put a big one on first, then started going down and liking it, i wnet to 20(this is all a stock motor) and it was not the ticket.

Best thing, experimenting, that is the only way to find the 'perfect' set-up.

[rcracer_xxxt_futaba]

XXXER, Have you ever had the prob with breaking a front axle? I had mine break of right at the nut. Is that un-normal? And is there a cause for it? Like its to tight? I was jumping a fairly small jump (5 feet long 1 foot of air) and it broke right off.

[rcracer_xxxt_futaba]

P.S. It didn't break at the nut to hold the tire on but the large nut you can only see when the tire is off. :p :) :D

[XXXER]

I think you are talking about that Aluiminum one with the hex thingy, no i have not, but i have seen people do it before, and more than one time in a day....I have not, as i said done this, but just replace it, and it should be fine

[Railman]

[ 05-08-2001: Message edited by: Railman ]

[XXXER]

So what rail, i do not care, either way, Matt said to go to losi's web site, and do the 'ask the team' for the release date of the stronger axles

[rcracer_xxxt_futaba]

XXXER, thats what I did! Did you read what I said on "Ask Matt Fransis"?

[XXXER]

Yes, i did, and did they get back to you? I would just wait it out, and frequent their site often, knowing them, they will say something about it on the website.

[Railman]

XXXer, I was talking about gearing...It's been gone over enough times & he's still gong to run what he had in the 1st place. That's fine, but why keep asking the same question if he isn't going to listen anyway? I wasn't refering to the axle thing, this was a gearing post. Peace! :)

[SirSpeedy]

Gearing depends on the car, track size, layout, wind, turn, timing, powerband, available traction, lane/groove width, # of passing areas, traffic, clearable jumps.

This is not a question you ask on a Bulletin Board. Ask at the track for a good starting point. If you are just chasing dogs on your street, refer to your manual.

[rcracer_xxxt_futaba]

Railman-- When I said "I was running 84/20 and it seemed as fast as my XXXT. So should I try 84/23?? I want a gear ratio that has top speed and a little acceration, 1/2 and 1/2. What would be best?"

I was refering to a stock. I never ran a mod until I said I did.

[XXXER]

Rail, DWB, Don't worry boutit, i do not really mind what goes on here, there is always a miscommunication happening somewhere, as i am sure that you have noticed since you registered.