|
||
|
 |
|
||||||||||||||||||
|
#1
06-06-2008
|
||||
|
||||
final drive Ratios for B4
Can anyone help..I am struggling to grasp the whole drive ratio malarky. I have just got a xcelerion Sensored 6.5T. In the instructions the FDR is 10.8 for a 2wd buggy. according to instructions this is calculated by divinding spur by pinion then multiliny by internal car ratio (2.6 on a b4. Working backwards an 81t spur equates to a 19t pinion.
Is this right? How close to the instructions should i go- any scope for higher teeth pinions. What are you guys running with your6.5T brushless? 
|
|
#2
06-06-2008
|
||||
|
||||
|
is the rotor in the motor bonded or sintered?
I run currently run a 5.5L sintered rotor in my X6 (conversion of a B4) with a 20t pinion/81t spur i'd play around with 20/21/22t pinion on a 81t spur with a 6.5 sensored motor, just check the temperature of the motor after each run and if you can't touch it with your finger for a fair few seconds without it burning you then it's geared too high so drop down a tooth or two if needed, hope this helps Mike.
__________________
Custom MG-Racing Associated DMS
|
|
#3
06-06-2008
|
||||
|
||||
|
Here's a b4 gear chart
 So you'd want to be running 20 on a 81t spur to get close the recommended overall ratio. MiCk B. :-)
__________________
http://www.dublinmodelracing.com/ (Off-road racing in Dublin) http://www.p-dubracing.co.uk (Stocking: 8Racing / AVID / GHEA / Xpert Racing / Factory R/C / Alton Design Innovations) http://www.msdmodels.ie/ (Trackside and on-line RC supplies.)
|
|
#5
08-06-2008
|
||||
|
||||
|
Do spur times transmission ratio divided by the pinion. That is the way I have always done it.
Peace Aaron(W-W)
|
|
#6
08-06-2008
|
||||
|
||||
|
[quote=Mike Hudson;131047]is the rotor in the motor bonded or sintered?
I run currently run a 5.5L sintered rotor in my X6 [quote] Yes but the x6 has an extra idler gear compared to the B4 so im sure that will change the internal ratio?
__________________
Schumacher Racing - Reedy - Schelle - TKR - Bandicoot Bodies - MIP - Nextlevelrc - Trishbits - Moss Models
|
|
#7
08-06-2008
|
||||
|
||||
|
no ben you can add 600 iddler gears of any size and it wont effect the internal ratio.
A
__________________
Ashley Williams I always thought by 2013 we would have flying cars, but we have got blankets with sleeves!
|
|
#9
08-06-2008
|
||||
|
||||
|
Only the gears on the layshaft and diff gear are used when calculating internal ration the idler gear i just for joining the gears together and determaning the way the wheels and motor spin. The idler gear with 90 teeth or 9 teeth wouldnt make a diffrence to the internal ration as the iddler gear just transferres the power. Its very difficult to exsplain.
A
__________________
Ashley Williams I always thought by 2013 we would have flying cars, but we have got blankets with sleeves!
|
|
#10
08-06-2008
|
||||
|
||||
|
OMG Ashley is right once again.??
the idler gear is just like a transfer gear Ben, and as its the same size as the first theres no reduction or increase it just turns the gear in another direction,
__________________
Mattys the driver,my names carl
|
 |
|
|
Team Associated
ahhh you learn something new every day
Linear Mode
