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#1
04-01-2008
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Tamtech for 2WD racing
I am looking at potentially getting a Tamiya Tamtech-Gear car for 2WD racing. Could anyone recommend one over the other?
Jimmy - I know you are running the Buggy Champ and we had a brief chat at Hereford about the front trailing arm suspension being better. I also see you and Vicky will now be running one each at Tamworth. Would you mind sharing your thoughts on what makes the car better for racing? Did you make any modifications? Also, what are the tyre/wheel choices like? I am probably looking at putting a low kv motor such as a 4100kv brushless motor in it and run with lipo's. 
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#2
04-01-2008
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The GB01 front end is pants. the hinge pins are weak, the arms are soft and rubbery, the hubs lurch over and give the steering a very bizzare set of angles. Normally in a 2WD you'd have around 25 degrees of caster - the mini front has at a guess zero when it's steering.
The GB02 is not as tunable - there really isn't much you can do with the trailing arms. They hinge pins are like you'd find in any 10th scale buggy - very strong for this little car, the arms are strong - the entire front end of the car is stronger and less flexible. The car just felt a lot nicer to drive - more like a real (10th) buggy on the track. Maybe someone can get the GB01 front end to work, but I tried it down on a track and found it felt a bit ODD. The Gb01 has a lot of steering lock - the GB02 doesn't really have enough. Not sure if you could dremel the GB02 to give it more but I still found it OK on the track. in terms of tyres I used the SC - soft compound GB02 tyres. they gave plenty of grip on the carpet and reasonable grip on the slippy. you can get some 12mm hex adaptors I think but DCM knows more about that. when I raced the car I used aeration dampers on the back and plastic CVA dampers on the front - don't bother with the aeration dampers, they will cost about 80 quid. The blue plastic CVA dampers do the same job at this scale. For springs I used cut down kit springs - the optional springs are all either too long, too hard or too soft in my experience. My write up mentions all the bits I used on my GB02. I also bought the GB02 upgrade for vickys frog - since its a lot stronger and I think easier to drive. The one thing that let my car down was the lower shock mounts - these popped off rather easily - which I fixed in my own way. The blue alloy ball studs only probably make this worse, since they are fractionally smaller in diameter. I put on the V2.0 alloy steering from 3racing - which isn't amazing and doesnt even fit the GB02. I hopped up the original steering with an off-cut of spring to reinforce the plastic servo saver and it has less slop than the 3racing setup. I changed the front shock mounting - which is now on vickys car. the original gb02 setup means the shocks get softer toward the end of the travel. I made brackets to move the shocks further back on the arms. This feels good on the bench but I found the front end bounced more - maybe I need to change the spring / oil to go with the new position also. so - still testing. Overall - you aren't going to be threatening the A finals- but you saw how my car went round, definitely pretty well, and fun to drive too. you have to be smoother but its satisfying and I like it.
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#3
04-01-2008
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Awesome, thanks for that Jimmy!
 When will your write up be up? Dead excited  You car certainly looked great going round the track. It made almsot no sound and looked very smooth. I am also looking at the Thunder Tiger ZT2 as a possible 2WD racer but the Tamiya's just look so damn cool in buggy guise! I think at the end of the day the look is going to win me over!
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