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RC10B4/T4 Forum

Old 01-29-2010, 10:23 PM
  #11191  
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Originally Posted by 440swinger-kid View Post
Hey guys I just got a 17.5 brushless and 7.5 for my B4 what do you guys suggest for gearing for each motor?
72/33 and 81/22ish
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Old 01-29-2010, 10:27 PM
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which one for the 33 pinion.... the 7.5?
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Old 01-29-2010, 10:38 PM
  #11193  
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Originally Posted by 440swinger-kid View Post
which one for the 33 pinion.... the 7.5?
noooooo unless you like smoke.
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Old 01-29-2010, 10:48 PM
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Originally Posted by 440swinger-kid View Post
Hey guys I just got a 17.5 brushless and 7.5 for my B4 what do you guys suggest for gearing for each motor?
what brands are they?
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Old 01-29-2010, 11:05 PM
  #11195  
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both orions...... yeah I am horrible at re gearing stuff but am trying to understand....
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Old 01-30-2010, 07:05 AM
  #11196  
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I am not sure about the other guys, but I would start at 27-28 with the 17.5 and 20-21 with the 7.5. Keep an eye on temps and wheel speeds and adjust from there.


I run 8.5 to 10.5 for all but the biggest smoothest tracks, then a 7.5 would be justified, imo.

....That said, i'm sure there are a ton of guys using 3.5 sedan motors in 2w.

lol,

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Old 01-30-2010, 08:00 AM
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Originally Posted by W.E.D.Jim View Post
I am not sure about the other guys, but I would start at 27-28 with the 17.5 and 20-21 with the 7.5. Keep an eye on temps and wheel speeds and adjust from there.


I run 8.5 to 10.5 for all but the biggest smoothest tracks, then a 7.5 would be justified, imo.

....That said, i'm sure there are a ton of guys using 3.5 sedan motors in 2w.

lol,

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You have the 7.5 right.

However, with a 17.5 ya gotta be up at 34/72 or 35/72 if your using an SPX, higher if your running any kind of static timing ESC. If you are running the Tekin RS and have the vegas software, gear 30-32/72. The tekin and SPX can get away with that lower gearing because timing will make up for the RPM but on a static timing esc, you would be FAR undergeared.
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Old 01-30-2010, 10:06 AM
  #11198  
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Originally Posted by rcman1993 View Post
Check your solder job. It might need some work because when one of the wires is loose. It cogs really bad. Also, check the bearings in the tranny, I replaced mine when it started to grind alittle and it helped slot. My buddy has the same problem with you and it was the bearings. Funky sound was coming from what seemed to be the motor but it was the trans bearings.

ok I will do that, but see you would think I would have some power at least right? Cause I pull the trigger.... Cog.... Nothing.... Cog.... Nothing. lol
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Old 01-30-2010, 12:28 PM
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i got a used t4 and put my sidewinder in it and the diif didnt like that so i bought a rebuild kit, it just spun and didnt go anywhere so is there any tricks when i rebuild it to handle the brushless motor.
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Old 01-30-2010, 02:15 PM
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Originally Posted by farny21 View Post
i got a used t4 and put my sidewinder in it and the diif didnt like that so i bought a rebuild kit, it just spun and didnt go anywhere so is there any tricks when i rebuild it to handle the brushless motor.
Here is a step by step diff build created by B-Fast Team Driver Mike Barrett. Hope this helps.

http://www.rctech.net/forum/attachme...1&d=1264885804



.
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File Type: pdf
B-FAST Diff Build.pdf (395.4 KB, 676 views)
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Old 01-30-2010, 03:23 PM
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thanks for the info, will help out alot.
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Old 01-30-2010, 05:22 PM
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Originally Posted by wayboarder View Post
You have the 7.5 right.

However, with a 17.5 ya gotta be up at 34/72 or 35/72 if your using an SPX, higher if your running any kind of static timing ESC. If you are running the Tekin RS and have the vegas software, gear 30-32/72. The tekin and SPX can get away with that lower gearing because timing will make up for the RPM but on a static timing esc, you would be FAR undergeared.
would you say a LRP Sphere Comp is a static timing ESC? and also could you gear down say a 8.5 in 2wd and then use a SPX or a Tekin RS to make up the top end with the timing up?

Thanks for any input,

Mark
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Old 01-30-2010, 05:59 PM
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Originally Posted by RC10B4_Mafco View Post
would you say a LRP Sphere Comp is a static timing ESC? and also could you gear down say a 8.5 in 2wd and then use a SPX or a Tekin RS to make up the top end with the timing up?

Thanks for any input,

Mark
Let's just say this. My 17.5 is competative against 13.5 and my 13.5 is competative against 10.5 because of my tekin rs. I love the boost on it. It is like having overdrive on a big ram 3500.
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Old 01-30-2010, 06:19 PM
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well i am running a GTB....
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Old 01-30-2010, 10:19 PM
  #11205  
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Hey guys, any secrets on how to keep tires glues onto the rims? When I originally glue the set, I had sanded dow the rim where the bead lays, and scuffed the tire bead and cleaned it with alcohol. And after checking to see if I had set-up my Tekin correctly, I noticed it had come unglued. To be honest, I'm about ready to start shoe gooing the tires one. That stuff really seems to work. Anyway, ideas anyone? I'm running a B4 and a T4 with a 13.5.
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