Answers.Body: <p>The simplest way to get different speeds is by changing the gears. The instructions get you to build it with a 12:20 gear down in the portal axles, so the easiest way to change the speed is to flip those to get 20:12. From memory that will not work because it interferes with other parts of the model.</p>
  
  <p>You can fit two 16 tooth gears in there instead, giving a slight speed increase. Or you can put an 8:24 gear down for even more torque (but even less speed). There two options are shown below.</p>
  
  <p>It's important that you keep all four wheels geared the same, otherwise you will be making the front and rear motors fight each other. That's not great for the motors and gears, and it will drain your batteries very quickly.</p>
  
  <p><img src="https://i.sstatic.net/v5i4k.png" alt="picture of portal axle swaps"></p>
  
  <p>Deeper inside the model there is another 12:20 gear pair that you can also swap for 16:16 (two sets of this, one each end).</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-10-29T00:00:38.587Z
Answers.LastActivityDate: 2013-10-29T00:00:38.587Z
Answers.UserDisplayName: Móż
Answers.Body: <p>You need <a href="http://www.peeron.com/inv/parts/5292" rel="noreferrer">these old school 5292</a> puppies ;-)  2 of them.</p>
  
  <p>Check a <a href="http://www.philohome.com/motors/motorcomp.htm" rel="noreferrer">motor comparison here</a></p>
  
  <p>You're gonna have to do some after-market mods but those are very powerful , I have them from the <a href="http://www.peeron.com/inv/sets/8366-1" rel="noreferrer">8366</a> set. But as you can see in the review, there are pro's and con's on every engine.</p>
  
  <p>I suggest reading it in full, it's an amazing source of information and you'll learn a lot like I did. There's a nice poster about them.</p>
  
  <p>It has 2 different outputs which makes it so fun to make something that can use them both.  Speed or torque.  They will drain your batteries for sure anyway you use it.</p>
  
  <p><img src="https://i.sstatic.net/VwMOl.jpg" alt="lego motor chart"></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-31T18:13:10.580Z
Answers.Text: Why oh why did Lego get rid of them!?!?  Maybe is was the un-Lego-like remote. It's funny because I remember seeing these a long time ago and when I got into Lego later I was amazed there were no real remote control cars. This is why I need to buy all the cool sets as soon as they come out! Anyway . . .  I think the PF XL motor would work well too . . . my fear is that I'll break some gears but that's the price to pay for a powerful and fast "crawler".
Answers.UserDisplayName: tooshel
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-31T18:45:58.093Z
Answers.Text: Oh, and another option is the PF XL motor with a gearbox so I can change speeds. http://sariel.pl/2011/02/2-speed-heavy-duty-linear-gearbox/
Answers.UserDisplayName: tooshel
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-31T18:49:04.270Z
Answers.Text: Indeed, I love that remote, I'm so glad I actually have 2 sets.  Found them on ebay at the time, pretty suspicious person selling it but hey ;-)
  
  Those motors are really awesome.
Answers.UserDisplayName: Glenn Plas
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-31T18:57:08.637Z
Answers.Text: You could actually crash the car in a way big lego pieces broke in half, so it was pretty fast, we played with them at work and some couldn't handle it ;-)  There is a big diff between the mechanincal power the PF XL and the RC one, but as always: lego isn't about receiving exact answers, but about posing the questions to figure out by experiment ;-)
Answers.UserDisplayName: Glenn Plas
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-31T16:33:16.003Z
Answers.LastActivityDate: 2012-12-31T16:45:19.043Z
Answers.LastEditDate: 2012-12-31T16:45:19.043Z
Answers.UserDisplayName: Glenn Plas
Answers.Body: <p>You can switch 4 pairs of gears on each end of the crawler (2 pairs in the portal hubs and another 2 pairs inside the gearbox infront of the motor) do this on both ends or you run the risk of broken gears or premature motor wear. I ran 12 tooth gears all the way from the motor to my hubs for a dramatic increase in speed however the torque suffered severely, I would only recommend doing my gearing with xl motors. Cheers :)</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-04-06T23:46:50.060Z
Answers.LastActivityDate: 2014-04-06T23:46:50.060Z
Answers.UserDisplayName: Richard Ballantyne
Answers.Body: <p>What about <a href="http://www.simonfoster.co.uk/speeding-up-the-lego-4x4-crawler-9398/" rel="nofollow noreferrer">this</a> in comparison to Móż's?</p>
  
  <p>The gist is to swap out two gears at the rear of the vehicle:</p>
  
  <p><a href="https://i.sstatic.net/oHz3j.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/oHz3j.jpg" alt="gears to swap"></a></p>
  
  <p>I see two solutions, but I don't know which is the better before I proceed to order pieces. One seems to be free, as it consists in switching these two gears in the image and/or the ones at the steering portal axles. Is there a difference between the two positions switching? Is the Móż's solution more balanced? Like having some more speed, but keeping enough torque power to remain a crawler?</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-07-28T01:26:54.300Z
Answers.Text: Welcome to Bricks! We're generally looking for answers that go into a little more detail and don't just include a link to another resource. I'll expand your answer a little so that it isn't just a link.
Answers.UserDisplayName: jncraton
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-07-28T17:22:18.580Z
Answers.Text: This community is too . . . strict maybe? I posted something similar and included a link to youtube and just got voted down so I deleted it and gave up . . . and it was MY question so I should probably know what sort of answer I was looking for. Anyway, that is one way to speed it up and I did that but even if it was 2x faster it was hard to tell because it was still so slow! :)
Answers.UserDisplayName: tooshel
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-08-06T08:43:37.760Z
Answers.Text: Still, this is a place to discuss solutions. What is the difference in mounting two 16T gears at the wheels or in the middle (where is marked in the picture above)? Is there a difference in power and speed?
Answers.UserDisplayName: mike
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-07-27T17:12:59.677Z
Answers.LastActivityDate: 2017-07-29T05:39:50.223Z
Answers.LastEditDate: 2017-07-29T05:39:50.223Z
Answers.UserDisplayName: mike
Body: <p>Just finished building the <a href="http://shop.lego.com/en-GB/4X4-Crawler-9398">4x4 Crawler</a> and it was a fun build but as a remote control car it is . . . in a word . . . SLOW! I know it's powerful and can climb over stuff but sometimes there is nothing to crawl over and I'd rather it be faster. Are there any other gear configurations that would make it a bit more exciting? </p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-12-30T16:51:16.523Z
Comments.Text: 'Crawler' is a good name then... :)
Comments.UserDisplayName: pcantin
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-12-30T18:51:13.160Z
Comments.Text: I think you need to find your own solution for the two (identical) motor blocks. There should be enough space to rebuild this with an XL motor or use other gear transmission ratios.
Comments.UserDisplayName: BetaRide
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-12-30T22:45:22.830Z
Comments.Text: YES! I didn't think what "crawler" really meant until after I had it put together . . . and, yeah, I've seen some videos where people are disappointed with the torque and the differentials. I have one XL motor and I'm about to order another!
Comments.UserDisplayName: tooshel
Tags: <technic><motor><set-modification>
Title: How to speed up the 4x4 Crawler truck 9398?
UserDisplayName: tooshel
ThreadText: # How to speed up the 4x4 Crawler truck 9398?
  
  (Asked by: username_0 on 2012-12-28)
  
  Just finished building the [4x4 Crawler](http://shop.lego.com/en-GB/4X4-Crawler-9398) and it was a fun build but as a remote control car it is . . . in a word . . . SLOW! I know it's powerful and can climb over stuff but sometimes there is nothing to crawl over and I'd rather it be faster. Are there any other gear configurations that would make it a bit more exciting?
  
  **Tags:** technic, motor, set-modification
  > **Comments:**
  > **username_1**: 'Crawler' is a good name then... :)  
  > **username_2**: I think you need to find your own solution for the two (identical) motor blocks. There should be enough space to rebuild this with an XL motor or use other gear transmission ratios.  
  > **username_0**: YES! I didn't think what "crawler" really meant until after I had it put together . . . and, yeah, I've seen some videos where people are disappointed with the torque and the differentials. I have one XL motor and I'm about to order another!  
  
  ---
  
  ## 4 answers
  
  ### Answer by username_3 on 2013-10-29. Score: 7
  
  The simplest way to get different speeds is by changing the gears. The instructions get you to build it with a 12:20 gear down in the portal axles, so the easiest way to change the speed is to flip those to get 20:12. From memory that will not work because it interferes with other parts of the model.
  
  You can fit two 16 tooth gears in there instead, giving a slight speed increase. Or you can put an 8:24 gear down for even more torque (but even less speed). There two options are shown below.
  
  It's important that you keep all four wheels geared the same, otherwise you will be making the front and rear motors fight each other. That's not great for the motors and gears, and it will drain your batteries very quickly.
  
  ![picture of portal axle swaps](https://i.sstatic.net/v5i4k.png)
  
  Deeper inside the model there is another 12:20 gear pair that you can also swap for 16:16 (two sets of this, one each end).
  
  
  ---
  
  ### Answer by username_4 on 2012-12-31. Score: 6
  
  You need [these old school 5292](http://www.peeron.com/inv/parts/5292) puppies ;-) 2 of them.
  
  Check a [motor comparison here](http://www.philohome.com/motors/motorcomp.htm)
  
  You're gonna have to do some after-market mods but those are very powerful , I have them from the [8366](http://www.peeron.com/inv/sets/8366-1) set. But as you can see in the review, there are pro's and con's on every engine.
  
  I suggest reading it in full, it's an amazing source of information and you'll learn a lot like I did. There's a nice poster about them.
  
  It has 2 different outputs which makes it so fun to make something that can use them both. Speed or torque. They will drain your batteries for sure anyway you use it.
  
  ![lego motor chart](https://i.sstatic.net/VwMOl.jpg)
  
  > **Comments:**
  > **username_0**: Why oh why did Lego get rid of them!?!?  Maybe is was the un-Lego-like remote. It's funny because I remember seeing these a long time ago and when I got into Lego later I was amazed there were no real remote control cars. This is why I need to buy all the cool sets as soon as they come out! Anyway . . .  I think the PF XL motor would work well too . . . my fear is that I'll break some gears but that's the price to pay for a powerful and fast "crawler".  
  > **username_0**: Oh, and another option is the PF XL motor with a gearbox so I can change speeds. http://sariel.pl/2011/02/2-speed-heavy-duty-linear-gearbox/  
  > **username_4**: Indeed, I love that remote, I'm so glad I actually have 2 sets.  Found them on ebay at the time, pretty suspicious person selling it but hey ;-)  Those motors are really awesome.  
  > **username_4**: You could actually crash the car in a way big lego pieces broke in half, so it was pretty fast, we played with them at work and some couldn't handle it ;-)  There is a big diff between the mechanincal power the PF XL and the RC one, but as always: lego isn't about receiving exact answers, but about posing the questions to figure out by experiment ;-)  
  
  ---
  
  ### Answer by username_5 on 2014-04-06. Score: 1
  
  You can switch 4 pairs of gears on each end of the crawler (2 pairs in the portal hubs and another 2 pairs inside the gearbox infront of the motor) do this on both ends or you run the risk of broken gears or premature motor wear. I ran 12 tooth gears all the way from the motor to my hubs for a dramatic increase in speed however the torque suffered severely, I would only recommend doing my gearing with xl motors. Cheers :)
  
  
  ---
  
  ### Answer by username_6 on 2017-07-27. Score: 0
  
  What about [this](http://www.simonfoster.co.uk/speeding-up-the-lego-4x4-crawler-9398/) in comparison to Móż's?
  
  The gist is to swap out two gears at the rear of the vehicle:
  
  [![gears to swap](https://i.sstatic.net/oHz3j.jpg)](https://i.sstatic.net/oHz3j.jpg)
  
  I see two solutions, but I don't know which is the better before I proceed to order pieces. One seems to be free, as it consists in switching these two gears in the image and/or the ones at the steering portal axles. Is there a difference between the two positions switching? Is the Móż's solution more balanced? Like having some more speed, but keeping enough torque power to remain a crawler?
  
  > **Comments:**
  > **username_7**: Welcome to Bricks! We're generally looking for answers that go into a little more detail and don't just include a link to another resource. I'll expand your answer a little so that it isn't just a link.  
  > **username_0**: This community is too . . . strict maybe? I posted something similar and included a link to youtube and just got voted down so I deleted it and gave up . . . and it was MY question so I should probably know what sort of answer I was looking for. Anyway, that is one way to speed it up and I did that but even if it was 2x faster it was hard to tell because it was still so slow! :)  
  > **username_6**: Still, this is a place to discuss solutions. What is the difference in mounting two 16T gears at the wheels or in the middle (where is marked in the picture above)? Is there a difference in power and speed?  
  
  ---
  
  