Losi XXX-S

Old 06-13-2003, 09:28 AM
  #6376  
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Hey, I don't know how this happened but my rear diff pulley broke. It's hard to explain but the side of the gear that keeps the belt from moving from side to side just broke right off. So now I have the diff pulley with one of the retainer pieces on and I have the other piece sittin' on my table. So I have a question, should I jest buy new diffs and pulleys all around, should I put the 41 tooth pulley in the rear and keep racing, or just buy a new 42 tooth pulley? Oh yea, when it happened my belt got all tangled by the spur and pinion(I do have the yellow belt) should I buy a new belt as a spare as well? Thanks alot!

Brandon
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Old 06-13-2003, 09:38 AM
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Originally posted by Smartazz07
Hey, I don't know how this happened but my rear diff pulley broke. It's hard to explain but the side of the gear that keeps the belt from moving from side to side just broke right off. So now I have the diff pulley with one of the retainer pieces on and I have the other piece sittin' on my table. So I have a question, should I jest buy new diffs and pulleys all around, should I put the 41 tooth pulley in the rear and keep racing, or just buy a new 42 tooth pulley? Oh yea, when it happened my belt got all tangled by the spur and pinion(I do have the yellow belt) should I buy a new belt as a spare as well? Thanks alot!

Brandon
I would just buy a new diff gear, unless you want to change how the car drives with the 41t

The belt should be fine unless it was crimped. If it looks like it was crimped, or damaged, you might want to replace it. You don't want it to come apart during a race.

-Troy
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Old 06-13-2003, 09:40 AM
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Get the new pulley, changing the rear pulley size will effect your handling. As for the belt it would be a personal decision, if you can see marks in the belt I would replace it and keep the one you have now so you will have it "in a pinch".....
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Old 06-13-2003, 09:44 AM
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Originally posted by Smartazz07
Hey, I don't know how this happened but my rear diff pulley broke. It's hard to explain but the side of the gear that keeps the belt from moving from side to side just broke right off. So now I have the diff pulley with one of the retainer pieces on and I have the other piece sittin' on my table. So I have a question, should I jest buy new diffs and pulleys all around, should I put the 41 tooth pulley in the rear and keep racing, or just buy a new 42 tooth pulley? Oh yea, when it happened my belt got all tangled by the spur and pinion(I do have the yellow belt) should I buy a new belt as a spare as well? Thanks alot!

Brandon
Replace the diff pulley. While you have everything apart, check the bearings in the spur gear and bearings in the guide pulley to make sure they dont have excessive play.

One other thing to check is the belt tensioner arm where it rests on the inside of the drive tunnel next to the tension adjust screw. Over time, the belt tensioner arm might embed itself into the graphite causing some misalignment in the drivetrain. Combine that with bad bearings in the spur and guide pulley and the chance for derailed belt increases.

Fixes:
-Replace the broken diff pulley
-Check the bearings in the guide pulley and spur, replace if needed.
-Check the belt to make sure it hasnt been pinched or shredded
-If the belt tensioner arm has created a mold of itself on the inside of the chassis next to the tension screw, consider using some shims between inside chassis and the belt tensioner arm to bring things inline again.
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Old 06-13-2003, 10:09 AM
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the same exact thing happened to me. one of the little flanges on the rear pulley decided to break off. just replace the pulley and you should be set.
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Old 06-13-2003, 11:33 AM
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THanks guys. ALso should I get more grease for the diff for when I dis assemble it?
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Old 06-13-2003, 01:24 PM
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i would just like to know if you guys prefer the high, mid or low roll center in front... thnx
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Old 06-13-2003, 05:26 PM
  #6383  
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highwayman-I always prefer mid front roll center with low rear. Whenever I raise my front roll center I loose offpower steering and when I run full low the car gets hard to drive. I think mid front and low rear offers the best all around balance on carpet/foam, asphalt rubber and carpet/rubber.
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Old 06-13-2003, 05:46 PM
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Todd- I loved the set-up article you did in RC/Car.... My car is now way fatser and more consistant than any other I have driven before!! 2 of the last 3 weeks when I went racing the track had a layout that was used last year, with both of my old cars the fastest lap I could run was a 12.1, and I only had a few 12 second laps the entire day...... A year and 1 G+ later with far less track time this year and only 5 race days with the car and I ran a fastest of 10.1 with many 10 second laps........ 2 weeks later and a little more tuning straight from the article and I hit quite a few 9.3's!!!! Inclludng the last 8 laps I ran in the main!!!! Heck my slowest lap was a 12.3!!!! (Except when my brush hung in 2 heats)

I am nowhere near as consistant or fast as the top 3 in the A (8.8''s and tons of low 9's) But your article made tuning and driving my Losi is way easier and more fun to tune and drive!!!!

BTW: I started exactly everywhere you said you started in the article....except am running foams.....


THANK YOU!!
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Old 06-13-2003, 07:05 PM
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Originally posted by T. Hodge
highwayman-I always prefer mid front roll center with low rear. Whenever I raise my front roll center I loose offpower steering and when I run full low the car gets hard to drive. I think mid front and low rear offers the best all around balance on carpet/foam, asphalt rubber and carpet/rubber.
How do you get medium roll center. I thought there was only low and high?
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Old 06-13-2003, 07:20 PM
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hey impactplayr
where have you found the setup guide ?? is it in a rccar action if yes can you tell me wich month and wich page ...

I will really appreciate !!!

thanks a lot
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Old 06-13-2003, 09:09 PM
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Originally posted by Sushi Boy
How do you get medium roll center. I thought there was only low and high?
If you purchased a graphite plus kit the mid roll center is included in the kit. I don't have the part number right now for you to purchase it by itself. If someone on here doesn't get you the part number by tomorrow I will get it for you while I'm at the track.
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Old 06-13-2003, 09:13 PM
  #6388  
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No it's in R/C Car,May 2003.It's the BEST set up guide for the xxxs out their!If you cant find one i think my LHS still has a few.
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Old 06-13-2003, 09:38 PM
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Default Roll Center Clarification

Losi low roll center is "mid" roll center. It's referred to as mid roll center because it is in between the Trinity low roll center and Losi high roll center blocks.
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Old 06-13-2003, 09:44 PM
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A-1229 Fr. and Rr. Low (Mid) Roll center pivot blocks.
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