15 Turn motor - Rough Estimate on speed ?

[__G__]

Hi there,

This question is probably asked many times , but hopefully someone can answer it? []

I'd like to know what sort of speed my car will do , fitted with a 15 Turn M-Troniks Pro Vision Modified motor ?

Thanks in advance

Gregor

[Not2Night]

This site might give you an idea.

http://home19.inet.tele.dk/martinjordt/res...tors/motors.htm

[__G__]

Thanks for the link but I didnt really understand it [8)]

Is there an easier way of working it out , in mph ?

Thanks

Gregor

[Not2Night]

Ok, You want MPH, check out this thread

http://www.tamiyaclub.com/xforum/topic.asp?TOPIC_ID=2085

WARNGING the following is my theory and may be worng...

Once you know your current MPH and the RPM of you current motor, figure the percent increase in RPM's of the new motor then apply that percentage to the MPH's.

How does thar sound?

[Zericon]

There is actually not enough info for that, What is your gear ratio? Maybe what car/truck do you have, maybe i can find the gear ratio and speed of the motor. It's not a hard math calc actually, just need some info, worst case is number of teeth on pinion, # of teeth on spur/counter and # on diff, with motor RPM it's just theretical math.

Could get into Roll out and other to be more exact but, it's more work and still won't be perfect due to battery and friction.

[] post all the info and i'll do the calc. [8D]

[turbocharged s15(2)]

hey i have a 14t in my tt01 and i used to live on a military base so im friendly with the cops so a cop clocked me at 35.3mph

So if yours is 15 you should be around 28-32mph

[spiff84(2)]

hi

it would be interesting to see how the calculation of speed by free-spinning motor rpm with gear ratio and wheel size, would compare to actual top speed by distance/time. I would have thought the calculation would be a long way off without taking into account real-world friction factors, but as i said: it would be interesting to see.

[DJTheo]

It would be definetely long way off, except if you gear your car very low and use a long straight.

Those calculations give only very "theoretical results", the formula is easy, speed (km/h) = motor rpm (1/min) * 60 (min) * tire diameter (mm)* 3.14 / (gear ratio (for example 7.8) * 1.000.000 (mm/km))

and 1mph is approx. 1.6km/h

Cheers

[__G__]

Thanks for all the replies , turbocharged s15's reply gave me the rough estimate I needed - Cheers.