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Old 11-24-2010, 06:13 PM   #931
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If they don't fit well, then what's the point of having that tuning option? For the spec classes here, it's really helpful to be able to use a 37t/21t combo. What exactly is the problem with the 37t pulleys? Too much slack in the belt? Not enough?

Sounds like the belt tension wasn't set correctly one way or the other. They make a belt tensioner for the front belt. You should be able to get proper tension no matter what pulley setup you are using.
I tried the 37t front and rear pulleys, but found the belts to be way too tight with the larger layshaft pulley. I tried both of the larger options, but reverted back, after much annoyance
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Old 11-24-2010, 06:34 PM   #932
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MICHAEL BROWN, I'm with you on that one......I wanted to try the 38 tooth pulleys with a 21 tooth layshaft pulley. Needless to say the belts were not even close to fitting. I was even using old broke in belts and the fit was still too tight. I wonder if any other manufacturer has a belt that will fit this combo....
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Old 11-24-2010, 06:49 PM   #933
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MICHAEL BROWN, I'm with you on that one......I wanted to try the 38 tooth pulleys with a 21 tooth layshaft pulley. Needless to say the belts were not even close to fitting. I was even using old broke in belts and the fit was still too tight. I wonder if any other manufacturer has a belt that will fit this combo....
I haven't managed to find anything else yet ??
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Old 11-24-2010, 08:45 PM   #934
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Originally Posted by MICHAEL BROWN View Post
I haven't managed to find anything else yet ??
21t center pulley can match with geardif 37t.
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Old 11-24-2010, 09:09 PM   #935
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21t center pulley can match with geardif 37t.
i think the issue is the rear belt is long enough. Would a 416x belt fit, in terms of teeth pitch?
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Old 11-24-2010, 10:00 PM   #936
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21t center pulley can match with geardif 37t.
Didn't work for me , was way too tight for my liking. Front belt was ridiculously tight. I tried with original kit belts and the updated Japanese belts...
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Old 11-24-2010, 10:01 PM   #937
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Hi Jeff,

for the gear diff, are you running 37t or 38t?

I found the 37t do not fit well with the belt, if 37t in use I will suggest to use the 38t instead.
38t gear diff and 19t centre pulley.
btw i run 4t mod motor and outdoor track 60m straight. I may be pushing it too hard but the belts tension is right..ive tested various settings for tension too. loose to normal tension snaps the belt, tight melts the pulley.
Im pretty confident the new spur adaptor will work and i can see that it may be a rare problem because not everyone runs a 4t mod.
Im quite pleased with the rest of the car.
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Old 11-24-2010, 10:45 PM   #938
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38t gear diff and 19t centre pulley.
btw i run 4t mod motor and outdoor track 60m straight. I may be pushing it too hard but the belts tension is right..ive tested various settings for tension too. loose to normal tension snaps the belt, tight melts the pulley.
Im pretty confident the new spur adaptor will work and i can see that it may be a rare problem because not everyone runs a 4t mod.
Im quite pleased with the rest of the car.
Definitely shim out the side-float....
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Old 11-24-2010, 10:46 PM   #939
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i think the issue is the rear belt is long enough. Would a 416x belt fit, in terms of teeth pitch?
yes, 416, Yokomo, TCX, T3, Sakura, all use same pitch belt. Even NT1, V-one RRR, MRX5, Edam Spirit, Edam Razor nitro cars all use the same pitch s3m belt. But the lenght for the belt for nitro will not fit the Sakura. Tried it before.
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Old 11-25-2010, 12:28 AM   #940
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Couple of pics...all ready to go.
Attached Thumbnails
Sakura Zero - New Touring Car!-sakura3.jpg   Sakura Zero - New Touring Car!-sakura.jpg  
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Old 11-25-2010, 04:52 AM   #941
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I am also racing with 4T, car ran appox 40packs so far and touch wood, no belt issue, but I do have stripping spur gear issue.

I believe the new spur adaptor will fix that, as screws to secure the spur gear, we can be safe to leave some gaps between the motor mounts and thus, less friction against center pulleys and no wobbling on spur gear.



Quote:
Originally Posted by jeff_78 View Post
38t gear diff and 19t centre pulley.
btw i run 4t mod motor and outdoor track 60m straight. I may be pushing it too hard but the belts tension is right..ive tested various settings for tension too. loose to normal tension snaps the belt, tight melts the pulley.
Im pretty confident the new spur adaptor will work and i can see that it may be a rare problem because not everyone runs a 4t mod.
Im quite pleased with the rest of the car.
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Old 11-28-2010, 04:50 PM   #942
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hey guys, do we need this? Does it contribute to the kit's performance?

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Old 11-28-2010, 05:41 PM   #943
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hey guys, do we need this? Does it contribute to the kit's performance?

Depends, on if you are struggling to access your motor screws past the spur gear. With the std spur, access is ok, but other brands/ sizes can make it impossible to get at the rear screw.
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Old 11-28-2010, 06:36 PM   #944
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Anyone running a VTA-sized spur gear won't be able to get to the motor screws without it, unfortunately. At least it's relatively cheap.
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Old 11-29-2010, 02:49 AM   #945
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I've got this motor mount but I can say not essential.

It make easier to adjust the motor screws, apart from that the motor will seat appox 1mm higher than the standard mount, which is benefit for the track with high chicane corners (red and white curve on the corners), as less chance to bottom out the motor if you get to the corners too tight.

I personally cannot tell any disadvantage by higher motor mounting, but I done a test by rotated my motor with the smooth end to the bottom, so far I do not have any motor scratch on the bottom end.
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