MT gearing

MT gearing

Post by Habi » Sat, 09 May 1998 04:00:00



I would like to know the fastest gearing for and RS4 MT w/ 17T motor??
thanks
Jacob

 
 
 

MT gearing

Post by HPIMa » Sat, 09 May 1998 04:00:00


Quote:

> I would like to know the fastest gearing for and RS4 MT w/ 17T motor??

> thanks
> Jacob

Hi, Jacob,
I'm not sure what you mean by fastest... do you mean highest top
speeds... quickest acceleration... or quickest track lap times??  I run
my RS4 MT with a 15 turn tripple Reedy mod and an 18 tooth pinnion with
the stock spur.  It's plenty fast for me, I actually would like to gear
it down a little because the motor gets a little on the warm side on hot
days, but the motor can rubs if I gear down on  the pinnion and no one
makes a spur gear bigger than 96 teeth.  I'll probably just switch to a
17 turn instead and save the 15 turn for bigger tracks.

Good Luck,
Garrett

 
 
 

MT gearing

Post by Habi » Sat, 09 May 1998 04:00:00


fastest everything. I have a 90 tooth on it and a 35 pinion and the battery
heatshrink  keeps heating and breaking so I'm gearing it way up. I would
like to keep the 90 on there so if you have any pinion suggestions, I'd
appreciate it

 
 
 

MT gearing

Post by Dusti » Sat, 09 May 1998 04:00:00


A 35 pinion sounds way too big. What came with the kit? anything?

 
 
 

MT gearing

Post by Habi » Sun, 10 May 1998 04:00:00


96/23 or something like that.

 
 
 

MT gearing

Post by Larr » Sun, 10 May 1998 04:00:00


Te stock pinion was included and meant for 16&17turn motors.  HPIMan you
might try addinf one tooth maybe.    I run a 17tor 18t on my 12double with a
stock spur...  The kit comes with 96/22.  With a 90t spur, you should be
DROPPING pinion size not increasing habib!!  You are going to if not already
kill your ESC batts and motor.

I run stock races and would NEVER consider going over a 30/96 ratio, it
woulds melt everything and be SLOW..   Stock motor have more torque than
mod's so you always put larger pinions on them..

Try something in the range of 20-22t pinion for that motor..  you should see
a marked improovement in accela nd probably top end also..

I though with mod you had more power, well you do, but only at higher RPM so
you have to gear down..  I learned the hard way  by melting a mod totaly
down..

--
Larry

"When in trouble, give it double."

Quote:


>> I would like to know the fastest gearing for and RS4 MT w/ 17T motor??

>> thanks
>> Jacob

>Hi, Jacob,
>I'm not sure what you mean by fastest... do you mean highest top
>speeds... quickest acceleration... or quickest track lap times??  I run
>my RS4 MT with a 15 turn tripple Reedy mod and an 18 tooth pinnion with
>the stock spur.  It's plenty fast for me, I actually would like to gear
>it down a little because the motor gets a little on the warm side on hot
>days, but the motor can rubs if I gear down on  the pinnion and no one
>makes a spur gear bigger than 96 teeth.  I'll probably just switch to a
>17 turn instead and save the 15 turn for bigger tracks.

>Good Luck,
>Garrett

 
 
 

MT gearing

Post by HPIMa » Sun, 10 May 1998 04:00:00


Quote:

> fastest everything. I have a 90 tooth on it and a 35 pinion and the
> battery
> heatshrink  keeps heating and breaking so I'm gearing it way up. I
> would
> like to keep the 90 on there so if you have any pinion suggestions,
> I'd
> appreciate it

Hi there,If you're running a 17 turn tripple with that ratio... be
carefull.  You're going to kill your motor (comm & brushes), your
batteries will not last too long, and your ESC may be getting
unneccisarily (sp??) warm.  This will also kill your performance.
Acceleration is probably sluggish and the motor probably is not spooling
up to its top speed.  You mentioned the battery shrink wrap is hot
enough to shrink and split... this will kill your cells in a very short
time.

Form what I've experienced with this kit, I wouldn't run any spur
smaller than 96-94 teeth.  I've found the 4WD drivechain really requires
a higher final drive ratio in order to really get things turning.
Unfortunately I cant run any pinnion smaller than 18 tooth with the 96
tooth spur.  In my case, with this ratio the rear belt rubs just
slightly on the motor can.  I could probably take a dremel to the motor
can and clean out just a little (like 1-1.5 mm) off the can to get the
belt to clear.  Then I could probably gear down to a 16-17 tooth
pinnion... but at this time the highest final drive ratio I can run is
(96/18) x 2.6 = 13.87.  I would recommend this ratio to you with the 17
turn motor, and then fine tuning it from there.  I honestly can't
recommend any ratio if you're going to use a 90 tooth spur, but if you
really like the 90 tooth spur, I would go with the smallest pinnion you
can fit on untill the can starts to rub on the rear belt.  Im running a
15 turn tripple.

Also note that I run my MT off road with Associated tires and wheels.
These are much larger (and maybe heavier) than the stock tires/wheels...
so I need to run a higher final drive ratio with this set-up when
compared to the stock set-up.

Good Luck!!

GArrett

 
 
 

MT gearing

Post by Habi » Sun, 10 May 1998 04:00:00


thanks for you help, I'll try a 20-22 pinion

thanks again
Habib

 
 
 

MT gearing

Post by Larr » Sun, 10 May 1998 04:00:00


I have run a 87 spur on mine, BUT I was carefull and made sure I kept a good
final ratio, in fact I was up to a 26/96 for my stock motor and by dropping
to a 87 was able to stagger back to my 24t pinion and have room to advance
further (Rather than buy another pinion, test, buy another.. I had the 87
sitting around for mt T3).  BUT I found that the 26/96 was optimal, the
24/87 just got things hotter and was slower off the line, with no ramakable
increase in top end..

--
Larry

"When in trouble, give it double."

Quote:

>thanks for you help, I'll try a 20-22 pinion

>thanks again
>Habib

 
 
 

MT gearing

Post by Habi » Sun, 10 May 1998 04:00:00


RIGHT NOW, I'M CONFUSED. I tried lowering my pinion w/ my 90T, and
everything got slower. then I switched to the stock 96t and played w/
pinion, but I still can get a fast top speed. nothing can beat that setting
I had originally. I might switch to 64 pitch. oh well. I'll take any
suggestions given to me. I'm buying a 14x1 motor so please give me
suggestions for that motor, on both 48 and 64 pitches

thanks
Habib