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Old 10-01-2007, 11:01 AM   #1
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Default MBX5T Questions

Hi,

I am so excited that my MBX5T Prospect is in the mail and on its way to me. But I have a few questions for the MBX5T.

1) Which diff juice (oil) do you guys use? I was told that people use something like 5K front, 10K mid, and 3K rear. And that those oils are not provided in the kit.

2) As I am new to Truggies and do have experience with buggies, is there anything special that I need to pay attention to on the truggy vs. that is different on the buggy.

Thanks!!!
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Old 10-01-2007, 01:55 PM   #2
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Do not use the little o rings that go behind the 4 small gears in the diff. I believe they are called S3 o-rings in the manual. When my truck was new I used 5,7,3 in the diffs. I am up to 5,10,5 now and will probably go up to 7 in front soon. One thing you will want is a set of 1.5mm pistons (should be black). Stock pistons are 1.4mm (should be white). The truck handles small bumps a lot better with the bigger pistons.
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Old 10-01-2007, 02:04 PM   #3
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Quote:
Originally Posted by windellmc View Post
Do not use the little o rings that go behind the 4 small gears in the diff. I believe they are called S3 o-rings in the manual. When my truck was new I used 5,7,3 in the diffs. I am up to 5,10,5 now and will probably go up to 7 in front soon. One thing you will want is a set of 1.5mm pistons (should be black). Stock pistons are 1.4mm (should be white). The truck handles small bumps a lot better with the bigger pistons.
Why not use the little O rings?

Also, what do you guys think of these two setup?

http://www.mugenracing.com/image/rac...vtracknats.pdf

http://www.mugenracing.com/image/rac...scotttnx5t.pdf
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Old 10-01-2007, 09:07 PM   #4
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Does anybody know how much the 5TR weighs?
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Old 10-02-2007, 12:16 PM   #5
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The little orings are there to act like thicker diff oil. Unfortunately they are inconsistent and will make the truck harder to drive. Make sure you still use the S5 orings that seal between the diff case and the outdrives or your oil will not stay in the diff.
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Old 10-02-2007, 12:58 PM   #6
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Originally Posted by windellmc View Post
The little orings are there to act like thicker diff oil. Unfortunately they are inconsistent and will make the truck harder to drive. Make sure you still use the S5 orings that seal between the diff case and the outdrives or your oil will not stay in the diff.
+1
For diff oil I use 7/10/3 and she runs like a dream.
Shocks I have 400 in the front and 350 in the rear. It only comes with one of these cant remember which one.
As far as the piston holes. I had a 1.5mm drill bit that I used to make the 1.4mm holes bigger. Or you can spend $13 and buy the 1.5's. Trust me that 0.1 makes a huge difference.
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Old 10-02-2007, 02:48 PM   #7
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Quote:
Originally Posted by windellmc View Post
Do not use the little o rings that go behind the 4 small gears in the diff. I believe they are called S3 o-rings in the manual. When my truck was new I used 5,7,3 in the diffs. I am up to 5,10,5 now and will probably go up to 7 in front soon. One thing you will want is a set of 1.5mm pistons (should be black). Stock pistons are 1.4mm (should be white). The truck handles small bumps a lot better with the bigger pistons.
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Originally Posted by portyansky View Post
+1
For diff oil I use 7/10/3 and she runs like a dream.
Shocks I have 400 in the front and 350 in the rear. It only comes with one of these cant remember which one.
As far as the piston holes. I had a 1.5mm drill bit that I used to make the 1.4mm holes bigger. Or you can spend $13 and buy the 1.5's. Trust me that 0.1 makes a huge difference.
How do you guys think 7/10/3 will work? Some of the local guys are running this, plus the setups i mentioned above used it also.

I place an order for 7/10/3 oil and 1.5mm pistons. I may have some Mugen 350 shock oil at home. I have to check. It's good I doing all this research now before I start putting my truck together, which hopefully will be this weekend.

I see both the S3 and S5 o-rings in the manual. Is this a common thing to not use the S3 O-rings?

Any other tips would be appreciated also.
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Old 10-02-2007, 03:16 PM   #8
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Sand the diff cups flat and use double gaskets so they wont leak. Yes nobody uses the s-3 o rings in the diffs.
Read this and join the forum. Really informative group of guys.
http://www.truggyracers.com/forum/in...showtopic=7287
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Old 10-02-2007, 04:43 PM   #9
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Once I ensure that there is no leaks, does the viscosity of the oil changes due to time such that I have to replace the oil?
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Old 10-03-2007, 07:17 AM   #10
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7/10/3 should work well. A lot of people run that now. Over time the oil will be used by the diff so you will need to check them occasionally and refill. Also do not fill higher than the crosspins in the diff.
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Old 10-06-2007, 03:45 AM   #11
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Use 3x14mm flat heads on all three diffs. Do NOT use the stock 3x8mm flat heads. They are too short and 99% the reason why the diffs leak.
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Old 10-07-2007, 09:19 AM   #12
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What are the primary differences between the regular MBX5T and the Prospec version?
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Old 10-07-2007, 09:52 AM   #13
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What are the primary differences between the regular MBX5T and the Prospec version?
shock towers, chassis braces, rear up rights, carbon fiber radio tray, upper steer brace and toe blocks...
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Old 10-07-2007, 11:57 AM   #14
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You also get a one-piece motor mount, thicker ackermann plate, and titanium tie rods. Also Mugen is going to stop making the standard kit and only the Prospec will be available.
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Old 10-07-2007, 12:40 PM   #15
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do NOT I repeat DO NOT double gasket them. This can throw off the mesh some guys do that but 2 gaskets will not fix the problem just build them right and you will have no problems. Also be sure to shim the diff correctly.
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