Revorocks's Hyper 7 100+mph project

[Revorocks]

Originally Posted by MiamizFinest

Nice ride!! If you don't mind me asking, could you link me those battery trays?! Are they 100% flat on the bottom??

Thanks, no they are not flat on the bottom, they are raised up but you could remove them with a dremel. The screws wouldn't have much material to grip to though if you did.

I took some pics for you.





They comfortably fit 5000mah 5S 30C packs.



I got them from TC Models.

[_paralyzed_]

2 things-

1. I don't understand what you did that you need shorter driveshafts. Did you change the center diff? Figure out what length you need. If you need 100mm dogbones you can usually find something within a mm or two on ebay by searching "100mm", then "99mm"or "101mm" etc., etc.

2. A buggy is light enough, you don't need nearly that much motor to reach 100mph. You can reach 100mph on 6s with an MMM and a 1512 size 2650kv motor. Additionally, the extra kv over the 1717 makes gearing much much easier. I just bought a Hyper 8.5 buggy with a 2650kv 1512 for the exact purpose of running 100mph to blow away the xo-1's.

You can certainly do it your way, and it will be cool, but there are much easier ways.

[Revorocks]

Originally Posted by _paralyzed_

2 things-

1. I don't understand what you did that you need shorter driveshafts. Did you change the center diff? Figure out what length you need. If you need 100mm dogbones you can usually find something within a mm or two on ebay by searching "100mm", then "99mm"or "101mm" etc., etc.

2. A buggy is light enough, you don't need nearly that much motor to reach 100mph. You can reach 100mph on 6s with an MMM and a 1512 size 2650kv motor. Additionally, the extra kv over the 1717 makes gearing much much easier. I just bought a Hyper 8.5 buggy with a 2650kv 1512 for the exact purpose of running 100mph to blow away the xo-1's.

You can certainly do it your way, and it will be cool, but there are much easier ways.

1. The centre diff has drive cups which are set inside the diff meaning no grub screw is needed. With my layshaft design it will have to have a grub screw, so the drive cups are longer, meaning I have to use shorter shafts. I can't simply slide the cups further in either because the. I won't be able to access the grub screw

2. Fair comment, yes it would be far less hassle to break 100 with. That setup, but with mine I can basically run up to 8s and gear it higher. I'm hoping for considerably more than 100 with this. It's my first speed car though so I am sure things won't be quite that easy :P

[cmac]

"I got them from TC Models."[/QUOTE]

I just went to their web site and they have a clone center "slipperential"
NOT COOL AT ALL!!!!! All the parts look like a knock off of Mike's. They even call it by the same name.

[Revorocks]

Originally Posted by ZippyBasher

Subscribed... Good Job so far man. You definatley have a great plan for going about this...

I think the 1717 is a good choice as well because it can probably take close to a 1:1 ratio on the pinion/spur, with the GRP tires being so light it will run fine. Probably giving you more attempts at 100+ before it heats up too much as well. Just gotta run some extra voltage... The GRPs are just great for the speed runs too!

Thanks!

That's good to know about the GRP's, and yes I should be able to gear this motor to the moon :P
As it stands I'm looking at a 36T 'spur', but my pinion is a 30T, and 30/36 only allows for 99mph top speed on 6S, which is not what i'm after.
my only choice is to get a larger pinion made £25 :( , and have a smaller spur made, so I can run around 34/32 or higher. That gives 126mph calculated top speed, which is more what I'm after. It's just annoying having to spend £50 on just two gears!

Originally Posted by cmac

I just picked up a set of those tires from Amain for my Losi 8ight. I might try to do something similar but with the 1515 and the right gearing. Good luck!!!!!

Thanks :D
100mph should be achievable with a 1515, after theres that 91mph E-Revo, an he was running a 1515 (2700kv version), so the 2200kv should manage just fine.

Originally Posted by cmac

I just went to their web site and they have a clone center "slipperential"
NOT COOL AT ALL!!!!! All the parts look like a knock off of Mike's. They even call it by the same name.

That is a shame, Chinese are copying EVERYTHING these days