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HPI bullet to race truggy (10tt) conversion series

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HPI bullet to race truggy (10tt) conversion series

Old 02-03-2014, 05:09 PM
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Default HPI bullet to race truggy (10tt) conversion series

In this thread I will be converting an hpi bullet st flux into something that can race against the ofna 10tts as 1/10 truggy is my favorite class of vehicle. I had previously done this conversion to a stampede 4x4 but was not happy with the results bashing or on the track. I found the center of gravity too high and the underside of the chassis would get caught way too often. I started searching for a new vehicle and found the Bullet. it had a more conventional layout and dimensions much closer to the original Ofna/ hoboa hyper 10tt. I will periodically update this thread with photos of the build along with parts used so others can try this. Any suggestions you have would be appreciated. I am cheap and will be doing this very inexpensively so this is somewhat of a budget conversion.
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Old 02-03-2014, 05:21 PM
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Default roller

I bought this Bullet St Flux as a roller off of RC Universe for $150 with free shipping. Shoutout to Genjem for a great roller in great condition. thanks a lot. The motor is a Leopard Hobby 3800kv 3660 (550 size) 4pole brushless motor I got off of ebay for about $60 and is paired with a Dynamite Fuze 150a esc off ebay for $50! In this form i am running it with a 12 tooth HotRacing pinion and low motor timing. otherwise the motor cogs like hell with those huge tires. Its a pretty heavy kit too. Id really like to try the losi 2800kv 4pole motor out of a 10scte
Attached Thumbnails HPI bullet to race truggy (10tt) conversion series-img_20140203_152037.jpg  

Last edited by awpldlto; 02-16-2014 at 07:31 AM.
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Old 02-03-2014, 05:25 PM
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Interesting! Good luck on the build
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Old 02-03-2014, 05:42 PM
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thanks a lot. I just finally started getting some products in for it. Now i can get rolling with it. hopefully i wont procrastinate too much with this one. I hope to have it done within the next 2-3 months.
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Old 02-03-2014, 06:04 PM
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Default To come in this build

-getting the basic idea
-getting the truck in order (missing links and other strangeness)
-battery tray mod
-suspension changes
-12mm hex adapters
-custom parts (will take a while)
-mounts for body and wing
-painting the body, complete with decals
-weight distribution and weight shed
-wheels and tires (ill need help with this one)
-"my backyard track" / action shots!!!
-possible upgrades (if im feeling frugal)
-parts list and $cost$
-final result
-what i would do better next time
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Last edited by awpldlto; 02-03-2014 at 06:16 PM.
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Old 02-03-2014, 06:14 PM
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Here is the basic concept of what i hope to achieve. the body is an ofna hyper 10tt body from amazon.com for $22. the wing mount is from a hotbodies d8 lightning. this was the cheapest 1/8 scale wing mount on ebay at the time costing me about $5. The wing itself is a proline 1/8 standard buggy wing that has been trimmed and shortened to to look more appropriate on a 1/10 scale. cost about $2. I already had these from a previous stampede conversion. they are just thrown on the car to show. i will get to the actual mounting later.
Attached Thumbnails HPI bullet to race truggy (10tt) conversion series-img_20140203_152152.jpg  

Last edited by awpldlto; 02-16-2014 at 07:31 AM.
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Old 02-03-2014, 06:23 PM
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Looks good!
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Old 02-03-2014, 06:50 PM
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Default To anyone viewing.

Please if you view this thread and are interested in the outcome post a reply. I will continue to post and update this thread regardless but the more people i know are interested in the build the more pictures and higher quality pictures i will post, along with specs details and parts links. Thank you.
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Old 02-03-2014, 06:52 PM
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Man it's looking good. Thanks for the shout out. Really excited to see where this build goes. I have heard good things about the losi 2800kv. My buddy has one in a slash 4x4 and it runs very well.
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Old 02-04-2014, 06:31 AM
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Yeah this leopard motor is great and all it just needs really low gearing. even with the 12t pinion and 54t spur this thing is so fast. it probably does close to 50mph on 2s.
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Old 02-04-2014, 06:49 AM
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Default stock setup

To anyone who hasnt seen a bullet before this is the stock system. its a finned 380 size motor which makes it the size of a 540 but still just a 380 rotor and stator. I cant imagine how this truck can even move stock, being so heavy unless, that motor is a 4pole which i dont think it is. so it probably only runs on about 45amps. the esc doesnt look like it could handle more than 60a. im hoping that me putting in a 4pole true 550 size motor capable of pulling 120a wont start causing drive-train issues.
Attached Thumbnails HPI bullet to race truggy (10tt) conversion series-hpi-bullet-flux-cd-hot-bodies-50t-center-differential-8084-1-hardened.jpg  
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Old 02-04-2014, 07:57 AM
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Cool project. Couple quick questions:

1. What are you planning on using for wheels/tires? Those big chevrons are great for bashing but not as much for racing. Plus you might be able to move your gearing around as all that rotating mass makes it harder for the motor to get started from a stop (cogging you are seeing)
2. 2s or 3s?
3. Any options for adjusting the suspension? Thought on moving to a single shock per corner?

Overall a cool project, keep it up!
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Old 02-04-2014, 10:39 AM
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wheels and tires ill definitely need help with. im thinking shortcourse wheels and tires but they are a bit thin and small for my liking so i may have to do monster truck tires. something around 110mm diameter would be perfect with around a 60mm contact patch. im keeping it on 2s for now. already ahead of you on the suspension im going with 1/8 scale buggy shocks. one on each corner. i just got them in and will post pics shortly.

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Old 02-04-2014, 11:36 AM
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Actually the stock motor ran well. Had no problems yanking the front end off the ground. That was just on 2s as well. What about 1/8 scale buggy tires? Have to find a way to adapt to 17mm hexes.
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Old 02-04-2014, 01:06 PM
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yeah ive heard the stock motor is surprisingly powerful for the size but i still think its ridiculous to come in such a big truck. 1/8 buggy tires are perfect in diameter but they are too thin and look funny without any offset. i have a set of hsp monster truck wheels and tires that are perfect dimensions they just dont hook up well.
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