Post by Deleted on Aug 31, 2013 8:32:00 GMT -7
I have been building a handful of custom Mega G chassis in both long and short wheel base. These are little screamers.....
* I first start off with a pair of threaded brush barrels from an Autoworld Super III (Some rip-off merchant on Ebay is selling these for $10 a pair !! dont fall for it!) or a Wizzard Storm, these will allow the adjustment of brush tension and is a must when going to a low-ohm armature and also makes changing of brushes much easier without having to disassembling the chassis.
* Find an armature rated at about 3 Ohm. The stock Mega G armature is about 6.6 Ohm which is pretty fast, but it's easy to get used to and as always, nothing is ever 'fast enough'....A cheap way out is to find a 3.5 Ohm armature from a special version of the Tyco 440x2 designed to run on batteries, I've seen these go on ebay for as low as five bucks. If money is not a problem, then any of the aftermarket items below 3 Ohm for a Tyco 440x2, Wizzard Storm, Slottech will do just nicely. TAKE NOTE THAT ARMATURES FOR THE SUPER G-PLUS WILL NOT WORK IN THE MEGA G.
* Now that the threaded brush barrels and hotter armature are fitted, install a pair of stronger high temperature brush springs and high copper content brushes with shunt wires. While you're there, a pair of aluminium heat sink screws (for a Wizzard Storm) will also do nicely to help with the heat generated from the higher brush tension.
* Find a pair of Neo traction magnets rated at about N50 or N52. The stock items are rated at N35 which is good, but can be better... There are magnet specialists on Ebay that sells 50 pairs of N50 for about $15, just have to make sure the size is correct. By the way, don't get ripped off by the hobby shops or Ebay sellers that sell 'traction magnets' for the Mega G for silly money ! They get their supplies in bulk from the same magnet suppliers I'm referring to....
* Rear tyres - you'll need a nice pair of silicone tyres, the easiest way is a pair of pre-mounted sponge/silicone tyres/rims that's offered by Wizzard, they sell for about $8 a pair which will last forever. The other way is a pair of slip-on silicone tyres, but I find that you'll need to use super glue to make them stay on the stock single-flanged mega G rims OR replace the stock rear rims with a pair of double flanged aftermarket items to keep the tyres on. Keeping the tyres on is a big issue when you have decent power.
* Replace the front wheels and axle with an aftermarket 'kit' with front wheels that rotate independently. Tyres are usually the skinny type to enhance turning performance.
* Create a second electrical path from the pickup shoes to the brush tubes - some people solder a pair of shunt wires from the brush tubes to the shoes. How I do this; I drill a pair of small holes in the chassis - inside the 'cups' for the pickup-shoe springs, I then feed the shunt wire through this hole and solder one end of each shunt wire directly to the pickup shoes, out of the way. The other end of the shunt wire is soldered to the outer end of the brush tube. A second electrical path is required as the pickup shoe anchoring point is the only available electrical path from the factory and I found this to be a huge weakness in the design of the Mega G.
* Tuning the gear ratio. From the factory, the Mega G is equipped with a 7 tooth pinion and a 25 tooth crown. I replace these with a taller 8 tooth pinion and a 22 or 23 crown. The stock 8 tooth pinion from an old school Aurora G-Plus (NOT THE TOMY SUPER G-PLUS !) is perfect. Options from Wizzard or BSRT is suitable for both the pinion and crown.
* A longer profile guide pin. I cut the stock guide pin off leaving the round metal base, drill and fit a drill blank of the same diameter but with a longer length. this will prevent the car from deslotting.
* Get a length of small gauge brass tubing and make up some body tubes to fit a lexan body shell - the gain in performance from a lexan body can not be beaten....
If these modifications are carried out correctly and the brushes are tensioned correctly, Wizzard Storms my backside passage ! It'll kill any Wizzard any time, anywhere....
Good luck.... and the most important thing: have fun !
* I first start off with a pair of threaded brush barrels from an Autoworld Super III (Some rip-off merchant on Ebay is selling these for $10 a pair !! dont fall for it!) or a Wizzard Storm, these will allow the adjustment of brush tension and is a must when going to a low-ohm armature and also makes changing of brushes much easier without having to disassembling the chassis.
* Find an armature rated at about 3 Ohm. The stock Mega G armature is about 6.6 Ohm which is pretty fast, but it's easy to get used to and as always, nothing is ever 'fast enough'....A cheap way out is to find a 3.5 Ohm armature from a special version of the Tyco 440x2 designed to run on batteries, I've seen these go on ebay for as low as five bucks. If money is not a problem, then any of the aftermarket items below 3 Ohm for a Tyco 440x2, Wizzard Storm, Slottech will do just nicely. TAKE NOTE THAT ARMATURES FOR THE SUPER G-PLUS WILL NOT WORK IN THE MEGA G.
* Now that the threaded brush barrels and hotter armature are fitted, install a pair of stronger high temperature brush springs and high copper content brushes with shunt wires. While you're there, a pair of aluminium heat sink screws (for a Wizzard Storm) will also do nicely to help with the heat generated from the higher brush tension.
* Find a pair of Neo traction magnets rated at about N50 or N52. The stock items are rated at N35 which is good, but can be better... There are magnet specialists on Ebay that sells 50 pairs of N50 for about $15, just have to make sure the size is correct. By the way, don't get ripped off by the hobby shops or Ebay sellers that sell 'traction magnets' for the Mega G for silly money ! They get their supplies in bulk from the same magnet suppliers I'm referring to....
* Rear tyres - you'll need a nice pair of silicone tyres, the easiest way is a pair of pre-mounted sponge/silicone tyres/rims that's offered by Wizzard, they sell for about $8 a pair which will last forever. The other way is a pair of slip-on silicone tyres, but I find that you'll need to use super glue to make them stay on the stock single-flanged mega G rims OR replace the stock rear rims with a pair of double flanged aftermarket items to keep the tyres on. Keeping the tyres on is a big issue when you have decent power.
* Replace the front wheels and axle with an aftermarket 'kit' with front wheels that rotate independently. Tyres are usually the skinny type to enhance turning performance.
* Create a second electrical path from the pickup shoes to the brush tubes - some people solder a pair of shunt wires from the brush tubes to the shoes. How I do this; I drill a pair of small holes in the chassis - inside the 'cups' for the pickup-shoe springs, I then feed the shunt wire through this hole and solder one end of each shunt wire directly to the pickup shoes, out of the way. The other end of the shunt wire is soldered to the outer end of the brush tube. A second electrical path is required as the pickup shoe anchoring point is the only available electrical path from the factory and I found this to be a huge weakness in the design of the Mega G.
* Tuning the gear ratio. From the factory, the Mega G is equipped with a 7 tooth pinion and a 25 tooth crown. I replace these with a taller 8 tooth pinion and a 22 or 23 crown. The stock 8 tooth pinion from an old school Aurora G-Plus (NOT THE TOMY SUPER G-PLUS !) is perfect. Options from Wizzard or BSRT is suitable for both the pinion and crown.
* A longer profile guide pin. I cut the stock guide pin off leaving the round metal base, drill and fit a drill blank of the same diameter but with a longer length. this will prevent the car from deslotting.
* Get a length of small gauge brass tubing and make up some body tubes to fit a lexan body shell - the gain in performance from a lexan body can not be beaten....
If these modifications are carried out correctly and the brushes are tensioned correctly, Wizzard Storms my backside passage ! It'll kill any Wizzard any time, anywhere....
Good luck.... and the most important thing: have fun !
Super detailed build tips as well. Thanks and consider sending in a car to Bear Creek Dragway. 
