300LikesTeam Associated TC4
08-15-2011, 09:10 AM
#9931
I know the gear ratios are getting higher every year, but with the 49teeth 48p Robinson spur gear you get 2.6fdr with the 47tooth pinion , 2.84fdr with the 43tooth pinion , 2.98fdr with the 41tooth pinion, etc.... So Robinson Racing got it covered well !!!! Now the only issue with the tub tc4 is that you will have to dremel the part of the tub chassis directly under the area where the pinion gear will be after fitting the motor in the car !!!!! If you forget to do that you will break the electric motor's rotor !!!!!!
08-15-2011, 05:09 PM
#9932
What part of the cam are you cutting?
08-15-2011, 07:02 PM
#9934
No prob Ron. I think ambient air was mid 80's then. I had to come off the gear a little and drop one or two off of turbo for those 100 degree days. We also had that long front straight all the time then, so the motor had room to breathe. If the track layout is tighter, then adjust accordingly.
08-15-2011, 07:06 PM
#9935
The sides of the teardrop near the top motor screw hole. Put the cam without the motor on it in the cam mount, and rotate it back and forth. You will see the sides of the cam hit the cam mount.
With the Tc3 you just ground out the plastic tub... with the Tc4 you have to mod the cam mount itself...
With the Tc3 you just ground out the plastic tub... with the Tc4 you have to mod the cam mount itself...
08-15-2011, 07:23 PM
#9936
Tech Addict
iTrader: (17)
The sides of the teardrop near the top motor screw hole. Put the cam without the motor on it in the cam mount, and rotate it back and forth. You will see the sides of the cam hit the cam mount.
With the Tc3 you just ground out the plastic tub... with the Tc4 you have to mod the cam mount itself...
With the Tc3 you just ground out the plastic tub... with the Tc4 you have to mod the cam mount itself...
08-16-2011, 04:44 AM
#9937
The sides of the teardrop near the top motor screw hole. Put the cam without the motor on it in the cam mount, and rotate it back and forth. You will see the sides of the cam hit the cam mount.
With the Tc3 you just ground out the plastic tub... with the Tc4 you have to mod the cam mount itself...
With the Tc3 you just ground out the plastic tub... with the Tc4 you have to mod the cam mount itself...
08-16-2011, 05:00 AM
#9938
having your gearing off too much on either end of the scale will result in either limited top speed or no low end acceleration while also overworking your motor setup and overheating/damaging your electronics...
That's the basics... as for what you want to do with your car the best thing is to speak with experienced racers at your local track or post your full motor setup and get a ballpark # to start with here...
i.e.
motor:
motor timing:
speed control:
boost setting or none for "blinky" 0-timing:
spur gear:
08-16-2011, 06:05 PM
#9940
Motor cam massaging does not go far enough, you will still have to switch your spur gears to 48p Robinson 49t, 52t, or 55t to get the high gearing necessary for racing !!!!!!
08-17-2011, 08:17 AM
#9942
You can get down to 2.6fdr in a tc3/4 with the 48p Robinson pinions and spurs that are much smaller than a 65t/40t combo or 65t/45t combo ! Rotational mass will be an issue the bigger the gears used ! It is preferable to have smaller, lighter pinions and spurs to achieve the same Fdr !!!!!!!
08-17-2011, 05:14 PM
#9943
AM03GT,
I notice that you only trimmed your cam, how come you didn't trim your motor mount?
I notice that you only trimmed your cam, how come you didn't trim your motor mount?
08-18-2011, 06:44 AM
#9945
You can get down to 2.6fdr in a tc3/4 with the 48p Robinson pinions and spurs that are much smaller than a 65t/40t combo or 65t/45t combo ! Rotational mass will be an issue the bigger the gears used ! It is preferable to have smaller, lighter pinions and spurs to achieve the same Fdr !!!!!!!
If you have a 2" wide spur, and a 1" wide pinion... how does tooth pitch affect ratio (other than 48 being less adjustable than 64 pitch)?
I just wanna be sure im understanding what you are saying here... cause a ratio is a ratio is a ratio.
And im sorry but, a little rotational mass in a shaft car is NOT a bad thing... unless youre running sick HP. Odds are tho, if you are running sick HP... you dont run it in a shaft car.