When buying Xlerators for use in modified Tjets........make sure your getting the Xlerator I or Ia style chassis!
There are three basic chassis designs for Xlerators (actually more if you include the subtle changes and/or material changes, but for this thread we'll go with three).
How do you tell one Xlerator chassis from the other, you ask?
Xlerator I
This chassis uses the same XL-Quadralam armature & gears set up as below, but has a full enclosed cover over the arm which makes things line up better, but does not allow air to flow across the armature, so they get hot quick!!!! This style is also harder to drop the body on because of the thickness of the cover.
Xlerator Ia
This chassis has a nice little brass "T" shaped piece that holds all the parts together including the XL-Quadralam armature & gears. This is the easiest to convert, and in my opinion best to use since it allows air to free flow across the arm, which as I mentioned above gets hot! This style also requires the least amount of body modifications when dropping the body for handling.
Xlerator II
Have an inline G-plus/Tyco 440 style armature, and can not be converted for use with pancake style Tjet chassis. On a side note, you can have some fun fooling your friends by modifying one to have straight front wheels (all Xlerators have the front wheels turned to the left) and putting it under your Tjet body, outside they look the same, inside they run very FAST!!!
With all of that said, please note this conversion is only good (speed wise) for about the first 12 feet of straightaway, so if you race on one longer then this, a well tuned Tjet, Tuff-Ones or JLTO will start to catch up. But, for the first 12 or so feet, these things pull like mad!
Hope this helps,
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