Booster Car & 4-Band TX Experience
A lot of people are asking what The 2 speed Booster Cars are and how dose it work.
Booster Cars (also known as 2 speed) are available as a kit called the "booster kits" @27,35,45.&57mhz and currently (11/22/2002) the "Nissan 350z"@57mhz and the "Automodellista Set"@27mhz. If you Already Have a Bit car and want to upgrade, you can get the "booster kits" which includes: 2 Speed Chassis, 2.2 motor, 9.86:1 gear axle, Medium tires, and a clear Skyline Body.
These sets do not come with the controller. You have to get TOMY's 4-band controller. The regular controllers will not work with the booster chassis unless it's the one that came with the Nissan 350z and Automodellista.
The 4-band controller has a function button on the top-right that activates the second speed. This is not NOS or Turbo and has nothing to do with it and has nothing to do with Zipzaps NOS/ Turbo motor either

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From my experience with the booster chassis is that on my 2.2 motor, if I don't have the button pressed, it runs a little bit faster than a 1.0 motor but with less torque (perhaps 1.2 or something . . . just guessing). I compared it by using a 1.0 on my NSX and a 2.2 on the Automodellista (same grearing). But when the button is pressed, it runs more like a 2.6 (although my 2.6 runs slower, I think I have a crappy 2.6. I will test again when I get a new 2.6). It's definitely Faster tha a 2.2 on a non booster car ( I compared it to my AE86 Trueno with a 2.2 & same gear)
About the 4-band controller: There is a switch in the back that has 3 settings.
B = booster chassis compatible ( 1st speed and when function button is pressed, 2nd speed)
C = always in 2nd speed mode
A= compatible with single speed (non-booster) chassis
I have read in some posts that It dose not work with older cars that don¡¦t have a "4-Band" sticker in the box. The oldest car I have is the AE86 Sprinter Trueno (G-09) and it "dose not" have a 4-band sticker on the box. But I tested that it works just fine with the AE86 with the 4-band controller in MODE C. (It even works fine with my OEM LXX chassis @27mhz). Other Models older than that (G-01 to G-08) I have not tested.
I hope this helps some of the questions I see.
If there is a mistake let me know