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Old 12-21-2001, 01:11 PM   #16
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Quote:
Originally posted by Ty
What size 64 pitch spur gear would you guys recommend for a TC3 (friend's car). Keep in my mind he only races stock. Thanks in advance.

I use 94 tooth.
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Old 12-21-2001, 01:30 PM   #17
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Someone told me that if 2 cars have the same FDR, the one with the bigger (more teeth) spur would still be a bit faster on the top end. Any truth to that?
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Old 12-21-2001, 01:48 PM   #18
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Thanks for the replies everyone. I will pick one up in that range.
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Old 12-21-2001, 02:15 PM   #19
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Quote:
Originally posted by Rog
Someone told me that if 2 cars have the same FDR, the one with the bigger (more teeth) spur would still be a bit faster on the top end. Any truth to that?
In teory, this should be true, but if you take attention to the difference on weight of two spurs, the difference, can be about 1 or 2 grams.

On which you can take some difference is on the pinion, I remember one race, I changed the pinion for another bigger (1 or 2 tooth more) but I changed a steel pinion for an aluminium pinion and when the inspectors teched my car they penaltied me for being 5 gr under the limit (1495 gr).

We weighted the pinions and the difference was 6 gr lower (!!!) the AL pinion from the steel pinion.
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Old 12-22-2001, 04:12 AM   #20
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Quote:
Originally posted by Corse-R
Little trick, the piece of paper works for 48p, but, for 64p gears, you need to get some more thinner, like some clear plastic used by your mom to wrap the foods on the fridge.
Awsome thanks for the tip. I'll go and check it out now.

Happy holiday all
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Old 12-22-2001, 05:15 AM   #21
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anybody tried bk pitch?
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Old 12-22-2001, 12:27 PM   #22
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I use BK pitch. They work fine, I wanted a little finer adj for my final drive ratio and I hate 64p. But I really like it when guys ask me what pinion I am running cause it looks like a 48p spur and they think I am running some outragous final.
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Old 12-22-2001, 04:27 PM   #23
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in my tc3, i use 64p for mod and 48p for stock. 64p lets me adjust the ratio more finely to make a 5 minute runtime on different mod motors. but they are less durable than 48p and on a big race, i usually replace the spur after every other heat to avoid stripping.
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Old 12-23-2001, 08:31 AM   #24
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I talked to a friend of mine, who is an engineer....he said that with the same ratio(48 vs. 64pitch) the smaller spur will give you better acceleration????something to do with leverage....
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Old 12-23-2001, 10:22 AM   #25
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I think it is a biger spur will give you more acceleration, but who knows...

Yes, I use BK and it is great. Good compromise between durability and tuning options, and it almost as quiet as 64 pitch.
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Old 12-23-2001, 11:12 AM   #26
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Quote:
Originally posted by Speedo
I think it is a biger spur will give you more acceleration, but who knows...

Yes, I use BK and it is great. Good compromise between durability and tuning options, and it almost as quiet as 64 pitch.
well...a small pinin and a big spur gives you a better acceleration...but slow top speed
a big pinin and small spur gives you a slow acceleration...but a higher top speed!
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Old 12-23-2001, 11:23 AM   #27
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Quote:
Originally posted by marvi
in my tc3, i use 64p for mod and 48p for stock. 64p lets me adjust the ratio more finely to make a 5 minute runtime on different mod motors. but they are less durable than 48p and on a big race, i usually replace the spur after every other heat to avoid stripping.
Marvi:

I use 48 and 64p and I replace 64p gears after a full race. But, for the sake of my mind I've one as spare part in my toolbox. Changing every heat is too much, I'd rather revise them and change if it's necesary, but not changing for pleasure.

Something very weird you may to have to change a 64p spur (their finer tooths don't let collect trash and sand).

I've used in the past with success 64p on my 4WD buggy (a very old Schumacher ProCat).
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Old 12-23-2001, 02:53 PM   #28
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Read this, I asked something about gearing on the hpi forum and they helped me out. It might help you guys understand, it helped me. http://www.hpiracing.com/rcforum/sho...=500#post94215
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Old 12-23-2001, 07:48 PM   #29
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i use 64p all the time in my yokomo and have never had to replace my spur, that ive been using for longer than i can remember.
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Old 12-23-2001, 08:11 PM   #30
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Quote:
Originally posted by Corse-R


Marvi:

I use 48 and 64p and I replace 64p gears after a full race. But, for the sake of my mind I've one as spare part in my toolbox. Changing every heat is too much, I'd rather revise them and change if it's necesary, but not changing for pleasure.

Something very weird you may to have to change a 64p spur (their finer tooths don't let collect trash and sand).

I've used in the past with success 64p on my 4WD buggy (a very old Schumacher ProCat).
we usually run 3-4 heats in our races and i just use new spurs every other heat because our track is really dirty (unmaintained asphalt parking lot). i just use the old spurs for practice. i've had several dnf's caused by spur failure - i always strip them because of pebbles (shouldve gotten an xxx-s). during the off season, ill try to experiment with 48p when i'm running mod. right now, it's just my personal preference to use 64p in mod because i'm having great results in lap times.
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