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Old 01-08-2006, 04:41 PM   #76
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What's the part number on these gears? Just got some good practice today at the track and it has a switch back section that the steering leaves much to be desired.
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Old 01-08-2006, 08:25 PM   #77
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C0272 - 38T Conical Gear
C0273 - 11T Pinion Gear

ntro75,

Yes, you'll have more acceleration with the 11/38.

With the stock CB/Spur (13/46) and stock diffs (12/40) the overall ratio is 11.79:1

With the 11/38 option diffs it is 12.22:1 (to compare it to the stock gears, it's like you're running a 12.55T clutchbell...theoretically ).

Tony P.
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Old 01-09-2006, 06:24 AM   #78
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Thanks tony, I just ordered all my gears! and parts to build spare diffs.
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Old 01-09-2006, 09:06 AM   #79
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Hey Tony,when I got on the phone with the guy at mugen he said those gears give more top end and the only way to improove bottom end on the mbx-5 is to change to a longer pipe/manifold and or a 12 tooth c/b so I cancelled that order because I do not want to go faster..already to fast.I dont know where you got your info but it was wrong.
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Old 01-09-2006, 10:57 AM   #80
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Quote:
Originally Posted by ntro75
Hey Tony,when I got on the phone with the guy at mugen he said those gears give more top end and the only way to improove bottom end on the mbx-5 is to change to a longer pipe/manifold and or a 12 tooth c/b so I cancelled that order because I do not want to go faster..already to fast.I dont know where you got your info but it was wrong.
ntro75,

The guy at Mugen is wrong.

Do the math....

40/12 = 3.33:1

38/11 = 3.45:1

The higher the ratio the lower top-end and better acceleration. I'm actually running the larger 40T ring gear with the 11T optional pinion for a ratio of 3.64:1 (this requires custom machining). Combined with a 51T spur gear and 12T clutchbell, the gearing in my MSR with MT tires is exactly the same as stock. My diff is lighter and the truck has a lower CG.

Trust me! I'm correct

Tony P.
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Old 01-09-2006, 10:59 AM   #81
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By the way, carolinasrc.com or amainhobbies.com both have the option gears at great prices.

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Old 01-09-2006, 01:20 PM   #82
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uh no your not, by changing the pinion from a 12 to an 11 you just made more accelaration, but when you change the ring gear to a 38 your adding more top end..math or no math, why does this need machining, why not just shims? its just like the spur gear and clutch bell..if you put a smaller spur on are you going to get more torque?..No. Oh and the guy at mugen is not wrong I assure you
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Old 01-09-2006, 01:26 PM   #83
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Quote:
Originally Posted by ntro75
uh no your not, by changing the pinion from a 12 to an 11 you just made more accelaration, but when you change the ring gear to a 38 your adding more top end..math or no math, why does this need machining, why not just shims? its just like the spur gear and clutch bell..if you put a smaller spur on are you going to get more torque?..No. Oh and the guy at mugen is not wrong I assure you
No he's still correct. It's like the gears in the rear end of your car. A car with 4.11/1 gears will out accelerate a car with 3.73/1 gears. The closer the first number comes to 1 the more top end you will have. Tony is correct.
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Old 01-09-2006, 01:29 PM   #84
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Besides did you talk to Mugen's customer service or tech support. If it's not the latter then they don't know jack. They only answer the phones and have no idea what they are looking at.
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Old 01-09-2006, 02:42 PM   #85
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Trust Tony ! HE IS 100% CORRECT !! Didn't you pay attention in math class ?? Just because some knumb nut answers the phone at Mugen doen't mean he's the expert !! HOLY SMOKES !!! it's simple division
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Old 01-09-2006, 04:33 PM   #86
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Tony you are correct, Personally I dont see the need for more acceleration. Tony I have a question, I see you have a mbx5 truggy. How do you like it? Im considering getting that or the jammin x1crt, But I kind of want to stick with mugen since I already have a prospec but I hear the x1crt just flat out corners better the mbx5t. Also what engine does most guys run in these things, .21's or .28's. Are the .28's legal?
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Old 01-09-2006, 04:50 PM   #87
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how does it differ from the spur gear and clutch bell? If you change to a smaller clutchbell you get more bottom end do you not?So how can you tell me that changing to a smaller pinion will not give you bottom end??if you put a 38 tooth gear in place of the 40 tooth gear thats not going to make it accell faster it will give it a faster top speed,just because YOU do not see a need for more accellaration does not mean I am out of line for wanting it whatever your name was.
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Old 01-09-2006, 05:17 PM   #88
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Im not trying to start a conflict if you want more accelleration thats cool, I dont think there really is a car that accells more than the mbx5. I would work on your clutch before I went changing all the gearing around, Go to 1.1 springs
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Old 01-09-2006, 07:21 PM   #89
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I have 1.1 springs, I just want the gear ratio itself more torqy (so the car would feel more like a mp 7.5 with a 48t spur in it)
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Old 01-09-2006, 09:53 PM   #90
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ntro75,

You're correct that the 38T ring gear takes away gearing like a smaller spur, but the 11T pinion has more of an affect on the gear ratio than the ring gear. No special shimming or machining is require dto run the 11/38. It drops right in. What I did on my MSR truggy was custom to get the gearing even lower.

In simplist terms, if you run the 12/40 versus the 11/38 in the diffs, the 12/40 will have less accleration and more top speed. The 11/38 will have more acceleration and less top speed.

On the clutch, personally I'll never run the 1.1 springs. I use 1.0 springs with aluminum shoes. Make sure you have the washers behind the shoes on the flywheel pins. If you don't have enough stall, then drill each shoe to lighten them up a bit (Chad Bradley used to do this). It's a much better option than the 1.1 springs. The 1.1 springs tend to get the clutchbell temps up high. Once they get too high, the springs will fatigue and then they're shot. If you don't replace them, the clutch shoes will be shot soon after. I get 2-1/2 to 3 gallons on Mugen aluminums with avidrc.com metal shielded bearings. That's in both the X5 and heavier MSR X5T.

By the way, what motor and pipe combo do you have on your car?

Best regards,

Tony P.
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