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Old 12-29-2005, 09:31 PM   #1
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Default Which transmission for my RS4?

Looking to get a 2-speed.

Found these. Says they both fit the RS4 2, but they have different model numbers.

UPDATE - Found them on the HPI site, and as the auction says, one is just more heavy duty. I attached pics.

HPI72516 $57.50 shipped


HPIA910 $48 shipped


Which should I go with? How exactly do these things work? I just know that the OS .18 has a lot more potential because this thing is topping out pretty low because of the gearing. I don't race.

Here is my car.

http://dubisteinspundloch.com/The%20...HPI%20RS4%202/

Last edited by RiceEatin1995GT; 12-29-2005 at 09:46 PM.
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Old 12-29-2005, 10:40 PM   #2
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The second one is actually listed in the original instruction manual for my car so I just went with that. No need to get all fancy.
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Old 12-29-2005, 10:55 PM   #3
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i run the first one that's listed with a paris .12 and have had no problem's at all . if your going to race . get the hd one ..
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Old 12-29-2005, 11:34 PM   #4
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I'm not going to race but I just read on the instructions it says "It's designed to be strong enough to handle Nitro .12 or .15 engines"

What do you think? I have an OS .18 in it
http://www2.towerhobbies.com/cgi-bin...&I=LXGGP7&P=ML

Now I'm thinking I should have got the heavy duty one. Should I email him and exchange it? That might be kind of difficult though.

I guess if you look at it this way. I've been taking it pretty hard, and if every other plastic part on the RS4 is holding up, this should.

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Old 12-30-2005, 09:10 AM   #5
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i would go for the hd version call him and see if you can swap it .
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Old 12-30-2005, 09:28 AM   #6
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I have the HD version. I think its also a bit more lightweight and just a good measurement on all accounts.

Who wants the weak stuff, unless its a whole bunch more in cost, which $10 isnt.

As well yeah the os 18 is going to need a little extra beef.
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Old 12-30-2005, 12:54 PM   #7
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You NEED the HD version 2 speed. The Original one simply has the one way bearing press fit into the 1st spur gear. The HD one has an aluminum seat for the oneway and the gear snaps onto that. Otherwise you are going to start spinning the one way bearing in the plastic gear with the older style.

Take some care though. Even with the HD 2 speed, on a high grip track I was ripping the mounting pins off of the 2nd gear when I shifted. I finally used some threaded rod and attached it more securley.
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Old 12-30-2005, 12:55 PM   #8
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Default hd

We put hd in ours, and we run 21 engines in ours, and they work fine. an ae .18 should have no problems.
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Old 12-30-2005, 01:16 PM   #9
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Quote:
Originally Posted by Rapid Roy
You NEED the HD version 2 speed. The Original one simply has the one way bearing press fit into the 1st spur gear. The HD one has an aluminum seat for the oneway and the gear snaps onto that. Otherwise you are going to start spinning the one way bearing in the plastic gear with the older style.

Take some care though. Even with the HD 2 speed, on a high grip track I was ripping the mounting pins off of the 2nd gear when I shifted. I finally used some threaded rod and attached it more securley.
Did you get the brace between the 2 shafts?



Part # a907
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Old 12-30-2005, 01:25 PM   #10
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just get the hd you won't be sorry had mine in for 6 years now and no problems yet
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Old 12-30-2005, 02:29 PM   #11
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Quote:
Originally Posted by Artificial-I
Did you get the brace between the 2 shafts?



Part # a907
Yes, I have that exact part on my racer-2. I only ran across 2 other people who were having the same problem. I'm pretty sure it was the combination of running foam tire, front one way/rear almost solid on a high grip permanent track that was to blame. The hard shifts would eventually make the press fit between the gear and the aluminum hub loosten up just a bit. Once this happened, the plastic pins that locate the gear on the aluminum hub would just shear off. I went through 5 or 6 gears before fixing it permantly myself.
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Old 12-30-2005, 05:06 PM   #12
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I wrote him an email. Hopefully he can exchange it. Haven't heard anything yet.
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