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04-12-2014, 07:08 PM | #1 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Shape_Shifter Builds a Sawback
Goofing around with trucks again.....
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04-13-2014, 01:30 PM | #2 |
Pebble Pounder Join Date: Jan 2014 Location: SE Iowa
Posts: 102
| Re: Shape_Shifter Builds a Sawback
Nice build SS How do you like the RC4WD springs so far? My brain cant decide to grab them or not |
04-13-2014, 03:36 PM | #3 | |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback Quote:
I think they are perfect for the Sawback. I had them on a Hilift a while back and did not like them on that truck for some reason. They just seem to work really well with the Gmade shocks. A big HOWEVER, you have to make traction bars or some sort of axle-wrap preventors. Otherwise they will wind like a clock spring! | |
04-14-2014, 05:54 PM | #4 |
RCC Addict Join Date: Sep 2007 Location: Port Orange
Posts: 1,855
| Re: Shape_Shifter Builds a Sawback
With the traction bar setup you have , how well does the suspension cycle. Also what do ya think of the brushless setup.
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04-14-2014, 07:09 PM | #5 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback
I was wondering what the traction bars would do but I performed many squish tests on the bench. It seems like they don't impede the travel at all on the trail. No more than say a panhard bar would effect coils in front. Definitely no problem in back with the Revolver shackles. The motor/ESC setup is as good as it gets for $86. The ESC is programmable up to a point. I have drag brake set at max (which is only %30) but it still rolls on steep drops. I wish it would go higher on drag brake but it just means you have to work your finger a little more. I love the sensored systems because you can adjust expo on your transmitter and dial in a creep with high torque. I almost bought a lower KV motor but this one works fine. I am going to put a 10t pinion on and see if it helps the drag brake at all. |
04-15-2014, 12:36 PM | #6 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback
New driver... |
04-15-2014, 01:47 PM | #7 |
Rock Crawler Join Date: Jun 2013 Location: Portugal
Posts: 506
| Re: Shape_Shifter Builds a Sawback
Looking good...
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04-15-2014, 02:00 PM | #8 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback |
04-16-2014, 10:59 PM | #9 | |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback Quote:
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04-17-2014, 06:10 PM | #10 |
Newbie Join Date: Nov 2012 Location: Winnipeg
Posts: 12
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Just picked one of these kits up..in the process of building..one question..what is "axle wrap"?
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04-17-2014, 06:52 PM | #11 | |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback Quote:
If you are doing slow, technical driving like rock crawling, you are susceptible to "leaf spring wrap" or "axle wrap". Lets say a tire gets stuck between a rock and a hard place - The motor and drive line will continue to to apply torque to the axle but the wheel wont spin because it's jammed. So instead, the axle will continue to turn against the leaf springs. Watch at about 1:45 in this video. https://www.youtube.com/watch?v=hX-kd2JcnJg You can see the springs on the left side of the screen begin to wrap a little. This happens, to some extent, to all vehicles with driven leaf spring axles. If your leaf is really soft (best for crawling) it can bend to the point of actually making a kink in the leaf. | |
04-18-2014, 06:41 AM | #12 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,918
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That's a great looking Sawback! That tire and wheel combo looks perfect. Where did you get those Revolver shackles? I'm also anxious to see the Cree LEDs! Sent from my SCH-I535 using Tapatalk |
04-18-2014, 08:55 AM | #13 | |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback Quote:
The Revolvers are actually called Shooter Shackles made by RC4WD. I guess there must have been a licensing issue so they couldn't call them revolvers. | |
04-23-2014, 11:22 PM | #14 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback
I finally got a chance to go out and play in the dirt with the Sawback. I tried to find a puddle but you can see from the pics that the drought is pretty bad. I am loving the suspension setup! Revolvers front and rear with 100mm shocks really let the Sawback stretch. Not the perfect crawler but damn good for leaf springs. Here's a shot with Mini-Me. |
04-24-2014, 06:55 AM | #15 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,918
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I love the Mini-Me! One of my front leaf springs is bent. I'm not sure if it's from axle wrap or from a roll down a hill. How about some photos of the shocks and the suspension at full droop without the body? That way we can see the increased suspension travel more easily. Sent from my SCH-I535 using Tapatalk |
04-24-2014, 08:48 AM | #16 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback
Okay, Ill post some this afternoon.
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04-24-2014, 03:38 PM | #17 |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback
I dont know if this is good or bad but its better than stock. Also, I added some lead behind the wheels. I wish I added more inside the wheels before the wheels were put together but I am too lazy to rebuilt all of them HA! |
04-24-2014, 04:08 PM | #18 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,918
| Re: Shape_Shifter Builds a Sawback
Those shots are great! Thanks! That's definitely more travel than stock. Those Rock Crushers look great on there. How do they perform? They're 1.9 wheels, right? |
04-24-2014, 04:21 PM | #19 | |
Rock Crawler Join Date: Mar 2009 Location: Parker, CO
Posts: 742
| Re: Shape_Shifter Builds a Sawback Quote:
Yeah the wheels are the 1.9" 5 spoke steel . You can kinda see how the shooters don't really rotate with the soft springs. Instead, the springs twist. You could probably just make some extender shackles that don't rotate and get the same performance with the soft springs. | |
04-24-2014, 06:08 PM | #20 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,918
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The shackles do twist a little bit but not as much as I thought they would. I bent my stock leaf springs so I'll need new ones. I don't like that the RC4WD ones are red though. Sent from my SCH-I535 using Tapatalk |
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