I have a TA04R, I have tried various different motors including a twist 47 brushless (unfortunately not mine). I have just stepped up from a 'non tunable' 15 turn to the supermodified 11T by Tamiya, and was dissapointed with the results, I have tried different gearing from about 8:1 down to about 5.6:1, but it wont go significatly faster,(36mph) I am about to try a dnya run motor as it seems to have more torque & simular RPM all this is controlled by a LRP F1 limitless controller. anybody got any ideas, Also if anybody is interested the twist47 propelled it to a top speed of 46 mph using 7.2v 3300gp pack, we verified this but venom speed meter & a speed trap.