Losi xxx-4

Old 01-11-2007, 05:28 PM
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Originally Posted by Justinian
Here's some photos of mine... sorry about the picture quality.. I'm not a good photographer

---snip---

Hope the pictures help....
They work for me, thanks for posting. Looks like it fits much easier than I thought. I'll probably pick up a MM 5700 for my XXX4 when the current brushed motor gives up. Probably 3 more events or so.....

Thanks!
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Old 01-11-2007, 05:30 PM
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This is from R/C car handling. http://users.pandora.be/elvo/

"Anti-roll bars are like 'sideways springs', they only work laterally. Here's how they work: if one side of the suspension is compressed, one end of the bar is lifted. The other end will also go up, pulling the other side of the suspension up also, basically giving more resistance to chassis roll. How far and how strongly the other side will be pulled up depends on the stiffness and the thickness of the bar used: a thin bar will flex a lot, so it won't pull the other side up very far, letting the chassis roll deeply into its suspension travel. Note that the bar only works when one side of the suspension is extended further than the other, like when the car is cornering. When both sides are equally far compressed, like when the car is braking, the bar has no effect. So anti-roll bars only affect the lateral balance of the car, not the longitudinal balance.
Unfortunately, anti-roll bars aren't the only things affecting the car's roll stiffness; they work in conjunction with the springs and dampers. Suppose you add an anti-roll bar at the rear of your car without changing any of the other settings. When the car enters a turn, the chassis starts to roll. Normally, the suspension on the outside of the turn would compress, and the one on the inside would extend, making for a lot more pressure on the outside tire. With the anti-roll bar however, the suspension on the inside will be compressed, so the chassis will roll less, and the rear of the car will sit lower than normal. So the rear has more weight on it, and it's distributed more evenly over the two tires. This makes for a little more, and more consistent traction. Remember that this is in the beginning of the turn, the situation is different in the middle of the turn. Normally, without the anti-roll bar, the chassis would stop rolling when the roll torque is fully absorbed by the outside spring. But with the anti-roll bar, some of that torque is absorbed by the anti-roll bar, and used to compress the inside suspension. So the outside suspension won't be compressed as much as it normally would, making the rear of the chassis sit up higher than normal, so less weight is on the rear of the car, and more at on the front. It's as if suddenly the rear has become stiffer, making for more steering and a little less rear traction. Rear traction is more consistent however, because the weight is distributed more evenly over the rear tires, unless the track is really bumpy, that is; anti-roll bars can really mess up a car's rough track handling, so they're rarely used on bumpy tracks. Adding an anti-roll bar at the front of the car has a similar, but opposite effect: it decreases steering, but makes it much smoother and more consistent. It can stop the front from 'biting into' the surface too much, making the turning radius big and smooth. This can come in handy on large, wide tracks.
Math-wise, the torsion stiffness of the middle part of the bar goes up with the fourth power of the bar's diameter, and for the two side parts, torsion stiffness goes up with the square of the diameter. Keep this in mind while changing anti-roll bars."
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Old 01-11-2007, 05:51 PM
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does anyone where to get the stock plastic chassis for the xxx4. part # losa4202. everywhere i look they are on backorder. i have emailed losi asking was up with the chassis a while ago but have not heard back from them.
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Old 01-11-2007, 05:52 PM
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Originally Posted by br93lx
This is from R/C car handling. http://users.pandora.be/elvo/

"Anti-roll bars are like ... etcQ
Hey, that's a great read - thankyou very much.

So... at the risk of oversimplifying, using anti roll bars versus none.... one gets a bit less turn in with an increase in mid corner turning?
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Old 01-11-2007, 09:23 PM
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Originally Posted by Inferno
Nice looking buggy Justinian. What servo is that you have? It looks very small

Cheers
Thanks for the complement...however the chassis and the body/wing I got used, so I can't take credit for that...

The servo is a Futaba S9550. It actually was slated for my XXX-S or my F103GT but I'm temporarily putting it in my XXX-4 to see if I like driving 4WD better than 2wd on the dirt. I'm hoping it lasts better than the JRs I had earlier...I kept frying those in my CR with lipo power... I ended up getting a very expensive Airtronics servo and a capacitor for the receiver...that seemed to solve the problem...Could be the capacitor, but I'm staying away from JR servos for now on as a precaution...at least the cheaper ones...

So far I haven't had much luck getting the thing to steer with a diff in front. (this was running nimhs and a JR coreless servo)..I went down to the 5 degree front pivot and changed the springs and suspension a bit..so I'm hoping I can get more steering that way... I really don't want to get a one way...I hear they're quite fragile and expensive... I may pull my Airtronics servo out of my CR and use that if I race the 4WD more...we'll see....

I do use the stock servo saver with it...I learned the hard way with my XXX-S that you need to check and make sure it's tight...My car kept pulling to one side and I couldn't find anything wrong...I finally found the servo saver had been loosened (probably after a crash) and there was some slop in the steering throw...at least it was a minor thing and not a broken servo, so I guess it does it's job...
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Old 01-12-2007, 12:13 AM
  #1116  
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Originally Posted by maxxman101
does anyone where to get the stock plastic chassis for the xxx4. part # losa4202. everywhere i look they are on backorder. i have emailed losi asking was up with the chassis a while ago but have not heard back from them.
It has been on backorder for a few weeks now. Any reason why you only want the standard chassis? Checked ebay?

Cheers
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Old 01-12-2007, 12:14 AM
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Bit_Rusty - Where do you get parts from for your Losi?

Cheers
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Old 01-12-2007, 01:47 AM
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Was searching on ebay and came accross this


A car stand for XXX-S & XXX-4 with build in fan. Looks pretty sweet.
http://cgi.ebay.com/Team-Losi-XXX-S-...QQcmdZViewItem

Cheers
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Old 01-16-2007, 10:25 AM
  #1119  
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Originally Posted by Inferno
It has been on backorder for a few weeks now. Any reason why you only want the standard chassis? Checked ebay?

Cheers
He wants it because the graphite doesn't hold up. I'm also looking if anyone finds any let us know!!

The back end of mine cracked right at the two screws.
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Old 01-16-2007, 11:31 AM
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basically yeah thats why I'm looking for the plastic chassis. i beat the crap out of my plastic chassis and nothing happened to it until i got t-boned by a truggy that wasn't paying attention.
The plastic chassis has been on backorder since last spring at Horizon Hobby, Stormer Hobbies and our LHS.
I dont want to spend $50 on a chassis if i don't have to.
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Old 01-16-2007, 01:23 PM
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Have you asked Horizon or someone when it is due?

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Old 01-16-2007, 01:36 PM
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Originally Posted by Inferno
Bit_Rusty - Where do you get parts from for your Losi?

Cheers
Hey inferno

Sorry for the delay in responding mate.

I get all my losi parts from Model flight, although im having a bugger of a time getting hold of any diff covers

But for everything else they're great. Aussie distributors of TL gear... so chances are, anywhere else you go for losi parts will prob be getting them off model flight!!
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Old 01-16-2007, 02:15 PM
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yeah i asked losi and horizon and have gotten no response. i also asked Aaron and he said that he would email them and get back to me when he finds out.
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Old 01-25-2007, 11:20 PM
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How often should you clean your diffs? Also, what do I need to do it?

Cheers
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Old 01-26-2007, 01:17 PM
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I would reccomend that you rebuild after every race day. Never get everything completely sealed and dirt will get in there. I've gone a little longer but I've ruined a few diff gears to.

Need motor spray and diff lube.
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