X-Maxx build thread (for speed mostly)

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LibertyMKiii

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I picked up an X-Maxx on eBay for a good deal. It came with a Leopard 5882 and Max5 esc. Some cheap Turnigy 4s lipos rated at 20c as well as a Futaba 3pv which I really like this radio so far!

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It also came with the MadMad 1/5 giant grip wheel/tires. T-bone skid plate and wheelie bar combo.
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The castle 6.5mm connectors are ok but I was highly suspicious of the electrical tape used. After opening it up it was a giant mess! Went ahead and swapped over to EC8 plugs
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Initial test was with a 29t/54t gear ratio
With the cheap batteries I hit 64mph. I then tried my high quality SMC batteries and hit 69mph.
Tried a 50t spur and hit 71.5 mph:
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At this point the tires are ballooning pretty bad so I am looking at getting some foams made.
Here is a comparison of the wheels purchased next to my 1/8 scale speed runner BSR foams:
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The plan is to max out what the Leopard 5882 can do then I will install the TP Power 5670 which is rated at nearly 3x the power!
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Had purchased a gpm cush drive eliminator part. It's going back! Screw holes were not tapped and the bearings are smaller than the originals (no bueno!)
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I ran this center drive / transmission output from Integy just 1 time for about 10 mins. Foolish of me to not pull it apart before and locktite everything. I should know better with cheap Chinese parts... screws backed out and began interference with the lower bulkhead. Also looks like the splines won't hold long, time will tell.
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Took my son to an indoor track (our first time) to drive his 2wd Slash. It was a blast! The people there let me know I could run the x-maxx there also. I was surprised thinking it would destroy that track. I'm excited to go back and try it out. 20181009_115908_1539219687954.jpg
 
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evssv

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i jus got me a garmin edge 200 to do sum speed runs with me rc's....will b testing my x maxx for sure(y)..that black tape is shocking:eek::eek:.....
 
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LibertyMKiii

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The Leopard 5882 is an impressive motor. I suspect Leopard has under rated its power which is kinda like shooting yourself in the foot as a marketing strategy. Most RC companies tend to do business the other way around.
To be honest I'm afraid to try the TP Power motor... it will take a gentle throttle application for sure!
I have been considering swapping over to my Castle XLX just because it has a better control software.
At the very least I'd like to compare the two.
i jus got me a garmin edge 200 to do sum speed runs with me rc's....will b testing my x maxx for sure(y)..that black tape is shocking:eek::eek:.....
Always fun buying a used RC vehicle. Glad I looked closer and got things fixed correctly now.
Let me know how your speed runs go, some competition is always fun!

-Liberty
 
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LibertyMKiii

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New PB this week at a new location 72.5mph
I was expecting a few more mph out of this gear change. I may be running into two walls here (aerodynamics and amperage output limits of the ESC)
Will be doing some adjustments and see what changes I can make to push this thing further.

Video of the run this week (only change was 29/46 gearing)


-Liberty
 

Seandonato73

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Cant believe someone would electric tape connectors on..... best of luck on your venture. And I would try out the castle esc. I can say the difference it made in my savage conversion for drivability in the programming. Plus the software is super easy to use.
 
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LibertyMKiii

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Cant believe someone would electric tape connectors on..... best of luck on your venture. And I would try out the castle esc. I cant say the difference it made in my savage conversion for drivability in the programming. Plus the software is super easy to use.
I agree, Castle makes a great ESC!
I have had a few of theirs and all were great.

-Liberty
 
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LibertyMKiii

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Swapped in the Caslte XL-X and the TP Power 5670 motor.
Held off on running it due to weather.
Thanks Giving holiday rolled around and took it out to a park to show my brother in-law.
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Not sure which part failed first the aluminum piece that holds the spur gear or the spur gear it-self but it broke apart and damaged a few parts. (spur holder, spur shaft, spur gear, main center drive shaft, pinion gear)

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New parts on order to swap over to a belt drive.... something I had been wanting to do anyway!

Data logs indicate ESC output was 8611 watts (8611 / 746 = 11.5 hp)
I was in the grass and probably squeezed near 60% throttle, the GPS only got as high as 45mph so it certainly was not going fast yet. Not sure if the 30k rpm is accurate on the logs with a 6 pole motor.
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Truck will be down for repairs for a few weeks but hopefully can get in some high speed runs once repaired!!!
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-Liberty
 

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