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Old 01-13-2006, 08:16 PM   #1621
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Quote:
Originally Posted by Teehomo
Hi all. A quick question regarding the drivetrain of the TB02. I have recently built one for my son and whilst it appears to run OK there are a few things I have noticed when I compare them to our TA05 and TA04.

Firstly, the drivetrain appears to be less free-wheeling than the others. At first I put this down to the fact that it was a shaft drive and the other two are belt drive however I have also noticed that the motor runs a bit hotter than the others as well. My question is should the dirvetrain be as free as a belt drive such as the TA04/TA05? Should the wheels spin as freely when the car is off the ground or is it normal for them to be tighter?

Secondly, on acceleration the TB02 makes a high pitch sound that tapers off as the car gathers speed. It accelerates at much the same speed as the others however I thought that it may be suffering from a slipping diff (which I am reluctant to tighten given the possible problem above). Should a TB02 and a TA05 accelerate at much the same speed given the same motors and stock drivetrain? Tyres are Sorex 28r on asphalt - I don't think it is wheel spin.

Thanks for any advice or help you may be able to give.
the TB02's drivetrain can be done up to be as freewheeling as TA04/05, you just need to spend some time to shim up the bevel gear properly. another thing to consider is to degreased all the bearings in the drivetrain, this will help to reduce some drag.
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Old 01-13-2006, 08:43 PM   #1622
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The diffs may be slipping and causing the high pitched sound. When I built mine per the instructions, mine slipped and I had to tighten the diffs a bunch.
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Old 01-13-2006, 09:01 PM   #1623
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Hey guys, I have a TB-02R I am parting with that has the parts to convert it to an Evo 3 as well. Asking $225. Pics will be up soon in the for sale forum
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Old 01-15-2006, 03:31 PM   #1624
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Quote:
Originally Posted by Hawk6
The diffs may be slipping and causing the high pitched sound. When I built mine per the instructions, mine slipped and I had to tighten the diffs a bunch.
Thanks guys.

I stripped the diffs down last night and found that on the rear diff, a screw from the rear sway bar holder had penetrated too far into the diff housing and was chewing up the diff gear. I also found that the long thin diff screw had been worn around the head by the the thrust race. I rebuilt the diff with a new gear and turned the thrust race around and will see how that goes.

On the front diff the diff ring on one side had spun around and completely stripped the raised cut out section of the out drive. So now, the ring on that aid is free to rotate - I'm sure this will cause problems later on. I rebuilt and reinstalled and now the drivetrain does feel much better. Unfortunately it's raining now and I will not be able to test it out for a while.

Anyway, looks like it might be time for a front one way and some hardened outdrives. I beleive that the Evo III units fit so will check out eBay to see what I'm up for.

Thanks again for your help.
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Old 01-19-2006, 01:07 PM   #1625
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Thanks tamiyarcracer and rcshark68.

Both my thrust bearings were in the wrong way round and I have also replaced the screws with the HPI ones. The next round of the championship is this Sunday so I will let you know how I get on.

Cheers
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Old 01-22-2006, 07:31 AM   #1626
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Regarding diff building in the tb02.

I use hardened outdrives and parts from the evoIV, assembled as per evoIV manual. Never had a problem, diffs run smooth as. You will also need 1 L Parts from the evoIV to get the nut retainer.
Note, TB02 and evoIV have spring and thrust bearing opposite, cant remember which is which, but if anyone needs more info let me know and will chase up for you.
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Old 01-22-2006, 03:35 PM   #1627
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I had that same problem with the sway bar screw going through the diff case. Good thing the motor wasn't installed and I noticed it wasn't free wheeling much.
What's the part number for universals shafts for the standard suspension? Will tao5 swing shaft assemblies fit? I checked the shop all they had were dogbones for the tbo2 and 48mm swingshaft for the tao5. I took out the lw suspension so I'm back to dogbones.
What gearing would you recommend for a 25m x 15m track with some tight turns and a long straight. Im currently using 55T and 22T but it seems to top off quickly in the straight. Love this car and will maintain it for stock but I will be buying a tao5 this week and maybe put some hot motor there.
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Old 01-22-2006, 04:11 PM   #1628
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Thanks WaOscar. I'm waiting on the front one way which should take care of the front diff. I'll also order the EvoIII/IV outdrives as you suggest - part number 50992 if anyone else is looking. The nut retainer looks the same as the TA05 so I will order another TA05 A tree and keep that as a spare for my other car. You're right about the springs - on the 02 they go under the thrust race, on the Evo IV and 05 they go under the nut retainer.
Has anyone found an alloy gearbox housing for the TB02? I believe that Square made a unit for the Evo III - would this work on the 02? The plastic units strip a bit easy, especially with the amount of work I've given them lately.
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Old 01-23-2006, 04:43 PM   #1629
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Quote:
Originally Posted by Teehomo
I believe that Square made a unit for the Evo III - would this work on the 02? The plastic units strip a bit easy, especially with the amount of work I've given them lately.
a vast majority of Square hopups that was made for the EvoIII will work on the TB-02. with the exception of the motor mount and other obvious hopups. (too many to name... )

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Old 01-23-2006, 07:54 PM   #1630
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If anyone wants a brand new evo3 front oneway and gears...I got one, never used it from my kit.
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Old 01-25-2006, 12:13 AM   #1631
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Rayman, today I purchased some TAO5 swingshaft 46mm..Installed them on my TB02 with stock front suspension. They are a tad long...what I will do to make them fit, is to grind down the ends of the swingshaft so that they will go into the diff outdrives..
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Old 01-25-2006, 08:47 AM   #1632
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Quote:
Originally Posted by Jspecrcr
Rayman, today I purchased some TAO5 swingshaft 46mm..Installed them on my TB02 with stock front suspension. They are a tad long...what I will do to make them fit, is to grind down the ends of the swingshaft so that they will go into the diff outdrives..
if you are not running the LW/reversible suspension on the front you need to use the 42mm universals. The 46mm will only work if you use the newer suspension (LW/reversible suspension)
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Old 01-26-2006, 08:17 AM   #1633
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Tnx for the replies. So a tao5 universal will fit on stock suspension arms with some "modification". Im not sure I like that idea. Anyone know the part number of the 42mm universal or which kit uses it? I have the the lw suspension and the universals that came with it one anodized blue and steel(46mm?) but Im going to install it on my new tao5 so I need to replace the dogbones on my tbo2.
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Old 01-26-2006, 02:33 PM   #1634
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The universals are the hop ups for the TB02, TA04, and EVO 3.

Tamiya Universal Driveshaft Axles #53499
Tamiya 42mm Swing Shaft for Universal #53501
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Old 01-31-2006, 09:06 AM   #1635
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Swing Shafts
If you use the reversible lightweight suspension on the tb02 you will need to
run 46mm swing shafts on the front. The 42mm swingshafts supplied with the l/w suspensions kit sit too close to the end of the out drive and when suspension is fully extended will tear out the outdrives.
Upgrade your outdrives to evoIV, T53627, my plastic ones lasted one race when I started racing 27T stock.
Previous posts also talked about tb02 weight, I've added 14g of lead to make my car 1529 ready to race with personal transponder.
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