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Losi xxx-4

Old 11-05-2008, 06:41 PM
  #2236  
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Originally Posted by F N CUDA
Never gonna happen, the XX4 will blow away the XXX4 on a real offroad (rough) track and still hold it's own on a smooth track.
There are several good setups for the XXX4 in this thread tho.
The kit setup is close and only needs a couple variations to go fast.
Start there and tweek it to do what your driving style needs.
this is something i wondered about. I was under the impression the xx4 is the older car why is it seem people are going back to it and why is it better than the xxx4 which to me is newer technology
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Old 11-05-2008, 06:54 PM
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That's a bummer you have to run 17.5.
Everyone knows the XX4 can't go with a stock motor.
Actually, all 4w buggies suck with stock motors but the XX4 has the most drag so it sucks harder.
Really surprised you guys even race 4w stock, it's bad enough with superstock 13.5 but at least it can get some air over jumps
Most 4w around here is mod. sportsman (so you don't have to run with the pros ) or at least superstock.
You guys should push for one of those classes, way more fun.
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Old 11-05-2008, 07:18 PM
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Originally Posted by shadow102
this is something i wondered about. I was under the impression the xx4 is the older car why is it seem people are going back to it and why is it better than the xxx4 which to me is newer technology
The XX4 has been described as having the best suspension geometry ever on a 1/10th 4wd buggy.
Longer travel, better ground clearance and the 3 belt system allows the motor to be located in the center of the car for balance.
But the 3 belt system causes lots of drag although new technology gives us enough horsepower to make that a non issue.
So, since the car handles so well and we now have enough power to make it fly, lots of us prefer it to all of the other RC cars we have ever driven.
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Old 11-06-2008, 04:18 AM
  #2239  
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I was wondering how the sway bars go?
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Old 11-06-2008, 04:27 AM
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anyone ever seen this thing before, im guessing the principle is right, xx4 suspension and layout, more efficient drive train, but the price is rather prohibitive

http://www.iq-tuning.ch/en/4wdmki-4....634c5d7580345f
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Old 11-06-2008, 01:26 PM
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Originally Posted by NOFX
Thanks for that, i love my xx4, in Australia we've been runing 13.5 as our stock class and the car has been awesome, but we've just aligned ourselves with the USA and 17.5 has become the stock motor (which i dont mind, i also think that the usa has it right with the 13.5 being the superstock motor but here its 10.5 and therefore i might as well be running mod) anyway the xx4 is getting eaten in a straight line with the 17.5, and you can get much more cooling into a xxx4 so they can be geared taller and the much more efficient drive train means i have to go xxx4, i'll look through the setups in here and see what the standard one is and go from there, im preparing for our nationals which are being held in mid summer on a 1/8th sized track with big jumps everywhere and a mix of high speed corners and tight ones, reasonable grip but dusty and blockheads/x2000's as the control tyre
If you want the benefits of the XX4 handling and the efficiency of of the XXX4 I would recommend you look at getting the XFactory X-5 conversion kit for your XX4. It's really a nice conversion.

This is the setup I used for those tires and a fairly rough outdoor track. A few people that I've given the setup to really liked it as well. We all drive differently so results are always varied.

Front:
Toe-Out: 1-1.5 deg
Ride Height: Bones Level or just a little above level.
Camber: 1 deg
Caster: Stock
Sway Bar: No
Ackerman: Forward
Kick-up: 10F (10 deg)
Front Drive: One-way with 42t pulley (if you don't have a one-way use the overdrive (41t pulley)
Drive Shaft: Aluminum/CVD
Camber Link: 1 w/2 washers
Shock Location: 2/Outside
Shock Oil: 35wt Losi
Piston: 55 (Orange)
Spring: Losi Orange
Internal Spring: none
Internal Limiting: .050"
External Limiting: none

Rear:
Toe-In Inside: 2 deg
Toe-In Outside: 1 deg
Pivot Support: 3R (3 deg)
Ride Height: Level front to rear
Camber: -0.5 deg
Diff: Plastic
Drive Shaft: Aluminum/CVD
Camber Link: 2-A (try 1-A if it steers to much for you).
Sway bar: No
Hub Spacing: Middle
Shock Position: 2-Outside
Shock Oil: 17.5wt Losi
Piston: 770
Spring: Losi Yellow
Internal Limiting: none
External Limiting: 1 piston
Wing: Losi High Downforce
Battery: Forward

Other: Belt Tension just tight enough not to skip under power. Slipper Tight, only about .5'-1' slip. The front spindle carriers modified to move the carriers forward .03". The chassis placed on the belt sander and beveled up the sides (helped reduce chassis drag).

The one stock race I participated in with this car I prepped narrowed belts with ever other tooth cut off. The belts won't last long but it does reduce the drive train friction by alot. That particular race had handout motors and I was able to carry a gear about 4 teeth higher than anyone else. My notes say I geared it 24 pinion with the stock spur, everyone else was lucky to run a 20t pinion.
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Old 11-10-2008, 12:05 PM
  #2242  
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I was taking apart my diffs for the first time and discovered that I had a rear steel on the front, and I took the rear apart, and it looks nothing like whats in the book, it had round diff rings with no inner notches and it had copper washers on the diff rings. Is this losi or is this a cobble job?

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Old 11-10-2008, 12:27 PM
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roadrashracing- That's the way mine came that I built this summer and it's the same way Losi is doing the diffs for the XXX-CR, XXXT-CR, and JRXS-Type R.
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Old 11-10-2008, 12:38 PM
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which order do they go, mine came apart hard so I for got to look.
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Old 11-10-2008, 12:46 PM
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The copper washer goes inbetween the diff ring and the outdrive, make sure you put diff lube on both sides of the copper washer
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Old 11-10-2008, 01:42 PM
  #2246  
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thanks now I can get it together right.
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Old 11-12-2008, 09:33 AM
  #2247  
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Mine came with a yellow belt, but when I put it on it seems shorter then the one thats on it. Do the make a yellow belt for the xxx-s too?
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Old 11-12-2008, 10:06 AM
  #2248  
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I think the yellow belt is a hop up for the XXX-S.
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Old 11-12-2008, 12:21 PM
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what are the pros and cons of using a one way, and sway bar
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Old 11-12-2008, 03:41 PM
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The tracks I raced on never called for a oneway but I did play with the sway bar a bit and was surprised the car was more stable and had more steering with the swaybar. I was expecting more steering but the rear of the car just felt more locked in as well. This was one both a really smooth and a kinda rough track.
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