Top Speed Check

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I was wondering if anyone knows of a cheap effective way to determine what the new top speed of my torment is. It started out as a 2WD brushed and stock Horizon is saying it would run 25 MPH off the stock electronics. I have upgraded to a Kinexsis 4000 KV brushless motor and ESC system along with the metal gears and I usually run it with a 4100 mAh LIPO battery. I also snugged down the slipper and the thing seems to fly now. I want to know what my new top speed is, any suggestions on how to measure that.
 
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Jerry-Rigged

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Cell phone GPS speed app. Strap your phone to your RC, and don't crash... :)

I actually use an "Extra" iphone 4 for my speed checks. I don't remember the exact app I have, but there are a bunch of them that will record the max speed.

Here is a video I did that shows the iphone in action - speed check at about 4:20 -
 
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I was hoping to avoid strapping my cell to the back of the truck, but I didn't think about using an old phone. Thanks for the assist.
 

DantheMan

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LOL....My wife swore if I strapped my new 900 dollar phone to the Ruckus that I would get "cut off".....hehehe, I suppose that means NO USE IPHONE/APP on my toy.(plus, so far...my high speed runs are unpredictable. 1/2 the time I wreck out)
 

KyleRC

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I have had 4000kv set ups and it was in multiple cars all of which had top speeds at or above 40mph but below 45mph. I also never had them geared extreme usually for low temps. So if your truck happens to be geared for low temps and reasonable acceleration you should be around 40mph.
 

streetracer621

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My Ruckus was running right around 40 mph with a 3930kv motor and moderate gearing for cool motor temps. I would take a guess that is where you are at. I was using an old phone with a cracked but usable screen until I recently got a Dynamite GPS unit that I found on Amazon Warehouse deals for $66. I expected some scratches or wear and tear, but it is in perfect condition.
 
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I'll take a look at the GPS. I like that idea better than using a phone. I did get out this weekend and tried to get a speed run, but had a steering issue where the screws that hold the front hub on fell out. I think I got that fixed with some locktite. I think I'll take another crack at it next weekend

@KyleRC - I'm still running the stock gearing the only thing that was swapped was plastic for metal. Still need to upgrade the spur gear, but first I think I need to get steering and suspension squared away before I really dig into the gearing.
 

Jerry-Rigged

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I'll take a look at the GPS. I like that idea better than using a phone. I did get out this weekend and tried to get a speed run, but had a steering issue where the screws that hold the front hub on fell out. I think I got that fixed with some locktite. I think I'll take another crack at it next weekend
If that was the shoulder screw that goes thru the C-hub into the axle carrier - the threads on the axle carrier strip out very easy. Once stripped, the shoulder screws pop out very easy. I switched to the ECX aluminum hub carrier, then lock-tite'ed the screws, and have had no issues since.
 
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That's pretty much the plan, thinking of switching to Hot Racing set up with Traxxas turnbuckles out front already have RPM a arms.
 
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My Ruckus was running right around 40 mph with a 3930kv motor and moderate gearing for cool motor temps. I would take a guess that is where you are at. I was using an old phone with a cracked but usable screen until I recently got a Dynamite GPS unit that I found on Amazon Warehouse deals for $66. I expected some scratches or wear and tear, but it is in perfect condition.
Are you guys saying ON 2s or 3s
 
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