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Old 07-27-2002, 08:27 PM   #1786
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If your motor is real hot and the track is tight run a 21 or 20 tooth pinion. Check and see how tight your belts are and check the gear mesh.
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Old 07-29-2002, 12:29 AM   #1787
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the spur 78T is a 48 pitch right? can i use any pinion, or it must be a 48 pitch pinion? i noticed the given 22T pinion that came with the custom kit is a little bit smaller in diameter compares to my tamiya 22T????

the internal ratio for the mr4tc is 2.2 right? so currently my 78T spur divide 22T pinion = 3.5454 times the internal ratio 2.2 = 7.79999.

if i use 20T pinion that gives me 8.58 ratio...much better for my 11T motor, right...esp. for tight track?
is there a guideline that i should follow? like 12T=>7.5 ratio above; 11T=>8.3 ratio & above;10T=> etc etc. ?????

pls advice me. thx
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Old 07-29-2002, 12:41 AM   #1788
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Quote:
Originally posted by jfc_tech
the spur 78T is a 48 pitch right? can i use any pinion, or it must be a 48 pitch pinion? i noticed the given 22T pinion that came with the custom kit is a little bit smaller in diameter compares to my tamiya 22T????

the internal ratio for the mr4tc is 2.2 right? so currently my 78T spur divide 22T pinion = 3.5454 times the internal ratio 2.2 = 7.79999.

if i use 20T pinion that gives me 8.58 ratio...much better for my 11T motor, right...esp. for tight track?
is there a guideline that i should follow? like 12T=>7.5 ratio above; 11T=>8.3 ratio & above;10T=> etc etc. ?????

pls advice me. thx
No, the pinion must be 48 pitch, your tamiya pinion is probably 64 pitch hence the smaller diam ter.

2.2 is correct, and your math is correct.

Generally, I would drop a tooth per wind you drop.

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Old 07-29-2002, 02:02 AM   #1789
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Yokomo used to recommend adding 10 teeth to whatever wind you were going to run...Eg,
10 turn + 10 teeth = 20t pinion
11 turn + 10 teeth = 21t pinion
12 turn + 10 teeth = 22t pinion and so on.....This was for 2000mah cells so should be easily OK when using 3000mah cells.

Take the pinion off the motor(while it's in the car)turn the wheels and feel for any serious resistance, there may be binding somewhere in the transmission.

Ambient air temperature will also affect how hot everything gets, track temp too.
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Old 07-30-2002, 06:30 PM   #1790
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Any setup tips for setting up a new MR4TCSP. I have a new one coming this week. I really like my MR4TC Pro so when I decided on a new ride I went with the SP. I did order a non one way pulley and a front diff. I never did like one ways plus the tracks I run at are pretty tight so brakes are nice to have.
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Old 07-31-2002, 04:53 AM   #1791
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Exclamation extreme rear upright toe-in

thanks Simon and speedo for the tips.

new question, both of rear upright are 3 degt toe-in!!!!??? how can that be...all the other yoks(at least here) standard is 1 Deg toe-in or maybe 2 degree. corner good but not too much and its dragging on straight speed run. we run on asphalt and tight track here. i use the Team Integy setup board. couldn't be wrong...

pls advice me other than i have to order new upright???
thanks guys...long live Yoks
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Old 07-31-2002, 06:02 AM   #1792
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I think that MR4TC's have 1/2 degree of rear toe in built into the arms on each side and I know the Pro kits came with 2 degree rear hub carriers that you could use instead of the 0 degree standard ones. If you put the 2 degree rea toe in blocks on you would have 2.5 degrees of rear toe per side. You could go to the 1 degree blocks out and have only 1.5 degree per side.

I normally ran the 2 degree rear hub carriers on my Pro. I will run them on my new SP as well. I figure it will come with them on the SP.
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Old 07-31-2002, 09:19 AM   #1793
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actually when using the 2 degree hubs, the total toe-in is usually at 3 degrees per side due to manufacturing issues plus slop. i have almost always used them so far to retain rear end stability on unprepared tracks for the highly responsive sp chassis.
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Old 07-31-2002, 10:21 AM   #1794
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I like the 1 degree blocks much better. Unless you are on a low traction surface, I think it would be worth it for you to pick up a pair of those.

Josh
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Old 08-01-2002, 07:12 AM   #1795
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Does anyone know where i could get aftermarket bearings for the SP online?
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Old 08-01-2002, 07:52 AM   #1796
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Quote:
Originally posted by MauiBuilt Racer
Does anyone know where i could get aftermarket bearings for the SP online?
http://www.bocabearings.com
http://www.acerracing.com

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Old 08-01-2002, 10:15 AM   #1797
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www.rcboyz.com
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Old 08-05-2002, 01:22 AM   #1798
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Wishing you a happy birthday
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Old 08-05-2002, 07:23 AM   #1799
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Thanks Speedo.

Just think - I get my pension in 5 years time!

I've been busy ribbing X Ray people in a thread called TC Euros. Have a read. They really get upset!

regards

Joe from sunny Malta.
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Old 08-05-2002, 11:44 AM   #1800
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Just finished building my new MR4TC SP version. Man what a nice easy to build car. Directions were excellent and the car looks great. I can't wait to run this thing. If it runs anything like my Pro did then this thing will really fly.
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