rc_ox

Monster Grasshopper Conversion

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Hi folks, 

I've been talking to my son about doing a Monster Beetle conversion on his re-re Grasshopper for a while now. Just checking if there are any 'gotchas'? Do the larger wheels put too much load on the steering and gearbox? 

We put a 540 in it which has given it good boost in power and speed. However it doesn't have enough ground clearance on the lawn and often gets hung up in thick grass. I thought the balloon tyres would help lift it and improve the springy suspension slightly too. So far the Grasshopper has been a great first car for my 6 year old - very durable and looks great!

I am considering the following two options... 

 

Option 1 - Lunchbox 

Get the Frog Hex adapters

Install Lunchbox front axles as they are longer

Lunchbox wheels and tyres 

 

Option 2 - Monster Beetle

Monster Beetle wheels and tyres. 

I guess I'll still need the longer Lunchbox axles on the front for this option too. As far as I know the rear Monster Beetle wheels have the same adapter as the Grasshopper.

 

Has anyone done one of these conversions and had good/bad results?

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You probably also might need to mount a ampro engneering transmission brace to get rid of the hopping behaviour of the car.

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Have a read here, there was a Hornet with Mad Bull Wheels a while back 

 

 

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Thanks for the fast replies @Running Fox and @73robb!

I looked up the front axle adapters in that youtube clip and they are way too expensive to get shipped to Australia. I think the part is about US$7 and shipping is US$14...by the time you add the tyres and wheels...he's run out of pocket money! The Lunchbox axles on the front should work just as well - I borrowed a friend's to check that they fit. One of the LHS's here has a pair for AUS$12. The bumper will have to be trimmed or removed for the wheels to get enough clearance though. 

I guess I should have done a better search of TC - Vrooom666's post already covered my question :huh:

Well the conversion seems like a fun project so I think we will go ahead! I'll be sure to post the results here when it's done. 

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2 hours ago, Running Fox said:

You probably also might need to mount a ampro engneering transmission brace to get rid of the hopping behaviour of the car.

Oh, I think that's only needed on the Hornet and Lunchbox (maybe the Grasshopper 2 as well?) The standard Grasshopper doesn't have that twisting action in the rear, it's pivot points are secured so it doesn't jolt when accelerating....if that's what you mean? 

 

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Fairly sure you don't need the hex conversion either. Lunchbox uses the Grasshopper gearbox and Lunchbox wheels aren't hex, they're the older Tamiya style. I think they will bolt straight on. As you say, just get the Lunchbox uprights and trim the bumper and you're golden.

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2 hours ago, rc_ox said:

Oh, I think that's only needed on the Hornet and Lunchbox (maybe the Grasshopper 2 as well?) The standard Grasshopper doesn't have that twisting action in the rear, it's pivot points are secured so it doesn't jolt when accelerating....if that's what you mean? 

 

Correct. You only need it iff you have that moving axle. Looks like a fun project to me! Be sure to send us some pictures!

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12 hours ago, ThunderDragonCy said:

Fairly sure you don't need the hex conversion either. Lunchbox uses the Grasshopper gearbox and Lunchbox wheels aren't hex, they're the older Tamiya style. I think they will bolt straight on. As you say, just get the Lunchbox uprights and trim the bumper and you're golden.

Good point, thank you! I'll see which way my "client" wants to go Lunchbox tyres or Monster Beetle spiked. Either way, it should be fun.

Stay tuned... 

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@Running Fox I like how everything is non-standard.  That's more fun.  I could buy AMPRO parts and know from the start that everything would fit.  Since you had to wrestle with mechanics of it all, that deserves more respect. My hats off to you.  

Bigger tires going slower is interesting. I suppose a stock 380 motor doesn't have enough torque to turn big wheels as fast as smaller wheels.  Traxxas 18 turn 380 is a good choice.  

I'm following this thread @rc_ox  I am curious what your client wants also.  

 

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I may have to change tack a little. I have been tallying up the cost of the front lunchbox axles + Monster Beetle wheels + Monster Beetle tyres and it adds up to nearly half the cost of the kit (inc. shipping because our LHS's don't stock many Tamiya spares).  

I just found the hex adapters for the Frog (#53913) - this allows you to run regular hex wheels on the rear rather than be locked into the MB/LB/GH wheel adapter type. I can test out the Monster Grasshopper conversion with my Wild Willy 2 wheels - he can buy a set or WW2 wheels/tyres if he likes it or he can try other buggy wheels too. 

 

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49 minutes ago, rc_ox said:

I may have to change tack a little. I have been tallying up the cost of the front lunchbox axles + Monster Beetle wheels + Monster Beetle tyres and it adds up to nearly half the cost of the kit (inc. shipping because our LHS's don't stock many Tamiya spares).  

I just found the hex adapters for the Frog (#53913) - this allows you to run regular hex wheels on the rear rather than be locked into the MB/LB/GH wheel adapter type. I can test out the Monster Grasshopper conversion with my Wild Willy 2 wheels - he can buy a set or WW2 wheels/tyres if he likes it or he can try other buggy wheels too. 

 

I have some brand new lunchbox uprights for sale if you want them? I am in the uk. PM me for details if you want.

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