Foxy

OK, that all sounds good. So how fast do they go??

As with all RC cars, that depends on engine power and gearing. Stock RTR cars usually come with 23cc engines and quite low gearing, therefore do not have very high top speeds. Its important when selecting engines and looking at the output figures, to understand that the size advantage these engines have does not give them big horsepower gains, but it DOES give them HUGE torque gains over nitro. Horsepower of a powerful .28 nitro engine, and a regular unmodified 23cc gas engine is about the same. Torque however is many times more from the gas engine.

So, simple answer, RTRs out of the box should do around 35-45mph, with engine and gear changes, speeds up to 60mph are quite acheivable.

Trust me though, a 1m long 25-30lb car going 35-40mph is an awesome sight, 50 plus is getting frightening. Such speeds are not necessary to get full enjoyment from a large scale car, but are of course, eminently possible.

Refer to [link=http://www.rcuniverse.com/forum/fb.asp?m=7172298]this thread[/link] for an example of some of the gear ratios that are available for the Baja 5b, and expected top speeds. Of course for the high speed gear sets, a more powerful engine is advisable.

Lastly, worth mentioning, though I will go into more detail later, that just changing the exhaust pipe can make a huge difference to these engines, sometimes increasing power by as much as 30%