i had the same experience too when i bought a K.I.T.T. in walmart with a 2.2 yellow and put it on my NSX, and bought a microsizer Lan-Evo with 2.2. The K.I.T.T. 2.2 motor was faster.

I returned the microsizer the next day.
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NSX-R , FairladyZ33, Auto Modellista, AE86 Trueno,
Calsonic R34, R34(WHT), Evo VII(YLW)