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Old 08-08-2014, 11:29 AM   #12841
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what offsets for 190mm bodies? 3mm or 6mm?
im sure 9mm is prob for 200mm wide fender drift or GT type bodies?
I have no local hobby shop!
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Old 08-08-2014, 02:21 PM   #12842
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Originally Posted by boudin4evr View Post
what offsets for 190mm bodies? 3mm or 6mm?
im sure 9mm is prob for 200mm wide fender drift or GT type bodies?
I have no local hobby shop!
No offset (0) is required for 190mm bodies.
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Old 08-08-2014, 02:54 PM   #12843
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TC4 fans have a look here.
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Old 08-08-2014, 05:34 PM   #12844
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Does someone know a way to tighten up the steering? Mine seems to have some flex between servo and where the part mounts to the rack is actually fastened.
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Old 08-08-2014, 05:42 PM   #12845
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TC4 is (allegedly) 190mm stock. 3mm offset wheels will get you close to 200mm wide. 6mm offset wheels might be just over 200mm. I think I'd buy a pair of 3mm offset and see how they fit with the body, then decide.

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Old 08-09-2014, 08:56 AM   #12846
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@boudin for HPI 200 mm bodies you want 3mm off set in the front and 6mm in the rear. Some of the wider bodies(mustangs,gtrs,vta bodies,etc) can run 6mm in front and 9mm out back.if you run 9mm though and race your car will push like a bulldozer
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Old 08-10-2014, 12:17 AM   #12847
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Just finished reading the whole thread
Too late to write something intelligent...
Will srart bugging you guys tomorrow
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Old 08-10-2014, 11:59 AM   #12848
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Quote:
Originally Posted by Solo1 View Post
Does someone know a way to tighten up the steering? Mine seems to have some flex between servo and where the part mounts to the rack is actually fastened.
What I did was put a plastic bag ( the one the replacement bearings came in) between the bearing and the arm and pushed the beAring in. That took some of the play betweenthe bearing and the mount.
I'm not that good @ explaining things, but as soon as I get my car back will take pics...
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Old 08-10-2014, 12:13 PM   #12849
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What I don't understand is why some people use big pinions (36T plus)
Isn't it better to use the smallest pinion/spur you can get away with?
Maybe I'm missing something....
Btw, we run a spec class: tub chassis, hpi saturn 20t motors, 1,420 grams, radial tires, production car bodies...
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Old 08-10-2014, 12:17 PM   #12850
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The smaller the spur and the larger the pinion, the more top speed the car will have, though it will lose acceleration. Depending on the motor, the track, and the heat (the motor will overheat if the car is geared for too much speed), different gear ratios are used. For people running 17.5 motors, their low rpms need to be geared for speed. Thus, people going to 60t spurs and 36+t pinions.
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Old 08-10-2014, 03:58 PM   #12851
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You can run a 4:1 ratio with a 15/60, 18/72, 25/100, etc. If you're running brushless, the gearing parameters are different as they make more torque, but don't turn as many RPM when compared to a brushed motor. For VTA (25.5 motor), a good place to start is with a 4.0 final drive, which would mean a 1.6 spur/pinion combo. With a 60 tooth spur, that means a pinion of 37 or 38. For USGT (21.5) or 17.5 TC, you would want a numerically higher (but what people refer to as a "lower") ratio.
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Old 08-10-2014, 07:55 PM   #12852
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Thanxs for the info guys... But what I really dont understand is why so many people use such big pinions when you can get the same ratio with a smaller pinion and a smaller spur? For example, instead of using 66/25 wich gives 2.64 I've seen pics and read of people using somerhing like 98/37 wich gives 2.648. ( numbers are used for reference only)

I left the hobby mid 90's as the first brushless motors were being used by the pros in speed runs on ovals. Came back in 2012 and I've tried brushless, but am sticking to this 20t class because is what I know. Have a bd5 for running mod collecting dust.
But we are changing to brushless next year, that's why im curious....
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Old 08-10-2014, 08:20 PM   #12853
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Quote:
Originally Posted by HornyToad View Post
Thanxs for the info guys... But what I really dont understand is why so many people use such big pinions when you can get the same ratio with a smaller pinion and a smaller spur? For example, instead of using 66/25 wich gives 2.64 I've seen pics and read of people using somerhing like 98/37 wich gives 2.648. ( numbers are used for reference only)

I left the hobby mid 90's as the first brushless motors were being used by the pros in speed runs on ovals. Came back in 2012 and I've tried brushless, but am sticking to this 20t class because is what I know. Have a bd5 for running mod collecting dust.
But we are changing to brushless next year, that's why im curious....
Running the largest combination possible will give you the best gear mesh and the smallest adjustment increments going up or down a tooth on the pinion. However, larger gears also mean more rotating mass and you may run into physical limits on how much you can adjust the motor. Also, on shaft drive cars like the TC4 you can use the motor to balance your car side to side by using different size gears combos. If you are trying to balance out a heavy battery, then the largest combo you can fit would help.
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Old 08-11-2014, 03:34 AM   #12854
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I think what you're missing is the pitch of the gears. The TC4 came with a 48 pitch spur gear (pitch measures the angle of the side of the tooth). Because of the lower angle, the teeth are further spread apart. That means fewer teeth along the circumference of the gear. They tend to be stronger, but louder, and don't allow for as fine adjustment. There are also 64p gears. Since the angle of the teeth is steeper, more teeth fit on the same diameter gear compared to a 48p. So given to two examples you gave, the gears themselves are actually close to the same size, but the 64p gears (98/37) allow for more fine adjustment of the final drive ratio.
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Old 08-11-2014, 02:15 PM   #12855
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Quote:
Originally Posted by beemerfan View Post
Running the largest combination possible will give you the best gear mesh and the smallest adjustment increments going up or down a tooth on the pinion. However, larger gears also mean more rotating mass and you may run into physical limits on how much you can adjust the motor. Also, on shaft drive cars like the TC4 you can use the motor to balance your car side to side by using different size gears combos. If you are trying to balance out a heavy battery, then the largest combo you can fit would help.
Thx!
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