R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road

Reply
 
Thread Tools Search this Thread
Old 09-09-2006, 10:24 PM   #1
Tech Apprentice
 
Join Date: Nov 2003
Posts: 80
Default explain gearing

Can some one please explain gearing to me, I got a used mtx-3 prospec and it came with a bunch of gears that I dont know how to use. correct to if im wrong running .8 means that you should have no more then a 6tooth gap? my current gearing is 20/28 and 60/53 will this work or is this way off all the gears I have except for the default pinions and Im trying to make this work with out breaking anything. I was also wondering how come the default gears are so different then the serpent 710
rcjayy is offline   Reply With Quote
Old 09-10-2006, 01:50 PM   #2
Tech Adept
 
Join Date: Jul 2006
Posts: 102
Send a message via AIM to apollo
Default

if you add up the total number of teeth on the first gear (pinion and spur) it should also be the same as the total 2nd gear

example: my rs4

1st: 19t+43t=62t
2nd: 23t+39t=62t

get it?
apollo is offline   Reply With Quote
Old 09-10-2006, 03:33 PM   #3
Tech Apprentice
 
budachi's Avatar
 
Join Date: Jan 2005
Posts: 72
Default

Actually you can mix and match pinions and spurs however you like on the MTX-3 , be it the 0.8 or 1.0 module. It's true that some cars need to be geared in certain combinations , like the RS4 3 but most "track" cars have pinions that retain the same overall diameter despite the number of teeth , so you can gear them any which way.

As to why the 710 and other cars have different teeth pinions and spurs , that's just one part of the equation. When your gearing your looking at the Final Drive Ratio , cars have different internal ratios so you can have different pinions and spurs between cars but still arrive at the same FDR.
budachi is offline   Reply With Quote
Old 09-10-2006, 04:01 PM   #4
Tech Apprentice
 
Join Date: Nov 2003
Posts: 80
Default

thanks for the reply, I think im getting it now. since I have a bunch of gears I should be able to do something like 20/28 and 53/60 and be OK? what is the thing about the 6 tooth max?

thanks again
rcjayy is offline   Reply With Quote
Old 09-10-2006, 11:57 PM   #5
Tech Champion
 
nitrodude's Avatar
 
Join Date: Aug 2002
Location: Oxnard, CA
Posts: 5,843
Trader Rating: 5 (100%+)
Default

The thing about the 6 tooth maximum is that most of the times the engine will not be able to pull such a big split. In other words, when the tranny shifts into 2nd gear the engine will bog down, and because of lack of power it will stop accelerating.
__________________
Steven Muller
AKA El Pibe RUFAST? HAHA!!!
Ronin Speed Parts
nitrodude is offline   Reply With Quote
Old 09-12-2006, 07:47 AM   #6
Tech Apprentice
 
Join Date: Nov 2003
Posts: 80
Default

with these new powerful .12's this should no longer be a problem right?
rcjayy is offline   Reply With Quote
Old 09-12-2006, 08:29 AM   #7
Tech Elite
 
Pattojnr's Avatar
 
Join Date: Apr 2006
Location: Perth Australia
Posts: 4,594
Trader Rating: 19 (100%+)
Default

right ?
they just strip gears now! lol
__________________
Serpent - Walter RC
Serpent E Power ..... Serpent 747 Reds M3T
Serpent 966-TE Reds M7T .... S411ERYX Speedpassion 3.5T, T-Shox
Serpent 811-TE REDs R5T
Pattojnr is offline   Reply With Quote
Old 09-12-2006, 08:52 AM   #8
Tech Addict
 
trumpster1's Avatar
 
Join Date: Nov 2005
Location: Toledo, OH
Posts: 521
Trader Rating: 9 (100%+)
Default

I'm running the new Orion CRF Wasp .12 and I had accidently matched a 5 tooth spread on first and 6 tooth spread on 2nd and....oops!! spur gear was gone! Don't mix gear spread numbers, make sure it stays consistent or you will be replacing gears about every 5 minutes, if that.
__________________
Nathan
Spektrum DX3R
Traxxas 2wd Slash
Ex-One Eighth Racers of Toledo member :( no mo money
trumpster1 is offline   Reply With Quote
Old 09-12-2006, 11:43 AM   #9
Tech Master
 
Rapid Roy's Avatar
 
Join Date: Oct 2002
Location: L.A. (Rowland Hts)
Posts: 1,531
Default

You need to ask this question in the MTX-3 thread because the answers you have gotten so far may not be correct. First, if your car came with 0.8 pitch gears only use those to run the car. The 0.8 gear pitch is more efficient and will make your car accelerate faster then the standard pitch. If you choose the standard pitch, use ONLY standard pitch pinions and spur gears. Next, I beleive that the Mugen 0.8 pinions are actually variable pitch. The outside diameter of the gear for all the different pinions are the same. That way you can use any combination of 1st gear pinion/spur with any 2nd gear pinion/spur gear. You need to confirm this in the Mugen thread though.
Rapid Roy is offline   Reply With Quote
Old 09-12-2006, 01:13 PM   #10
Tech Elite
 
quietstorm76's Avatar
 
Join Date: Apr 2005
Location: Atlanta
Posts: 2,265
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by Rapid Roy
You need to ask this question in the MTX-3 thread because the answers you have gotten so far may not be correct. First, if your car came with 0.8 pitch gears only use those to run the car. The 0.8 gear pitch is more efficient and will make your car accelerate faster then the standard pitch. If you choose the standard pitch, use ONLY standard pitch pinions and spur gears. Next, I beleive that the Mugen 0.8 pinions are actually variable pitch. The outside diameter of the gear for all the different pinions are the same. That way you can use any combination of 1st gear pinion/spur with any 2nd gear pinion/spur gear. You need to confirm this in the Mugen thread though.
He's correct. You can use any combination of gearing you want as long as it is within the same pitch. The days of a certain "tooth split" is gone.
__________________
Team Shepherd USA:Nugget's Ranch Raceway
Primary Weapon: ?
Secondary Weapon: ?
Tires>>> I don't know yet
quietstorm76 is offline   Reply With Quote
Old 09-12-2006, 02:10 PM   #11
Tech Apprentice
 
budachi's Avatar
 
Join Date: Jan 2005
Posts: 72
Default

Just to make it clearer in my first reply , I meant that you can mix and match pinions and spurs for 0.8 and 1.0 however you like within their respective module/pitch. The parts list for your car will list all the pinions and spurs you can use.

And "tooth split" is not gone , some cars still need to be geared specifically , mostly the RTR's , but yeah not likely to be seen on a "race" car nowadays. What your hearing about this so called "6 tooth gap" is probably someone trying to tell you not to gear too wide apart between first and second , as someone else mentioned on this thread. And even with the power of .12 nowadays , under or over gearing will still net you a sick engine. Only way to gear a car is ... correctly?

As far as gearing goes , just run whatever is optimal for your track and engine. If there are some people that run the same car ... ask em! As long as the engine doesn't blow up and it goes like a rocket , your all set.

Here's a link for you too regarding your question about gear/ratios.

http://www.radiocontrolzone.com/cars/fastmath.asp

All the best!
budachi is offline   Reply With Quote
Old 09-12-2006, 06:18 PM   #12
Tech Apprentice
 
Join Date: Nov 2003
Posts: 80
Default

thanks, you guys are awesome and im getting a better understanding now, I posted this in the mugen mtx 3 thread and I didnt get many replies (I guess everyone has a mtx 4 now ) the last thing I need to figure out is there a way to look at the gears and tell which ones are 1.0 and .8 because the guy that sold me the car gave me a mixture of both and I dont want to mix them or I will really have problems.
rcjayy is offline   Reply With Quote
Old 09-12-2006, 06:36 PM   #13
Tech Adept
 
Join Date: Jun 2004
Location: Hong Kong
Posts: 188
Default

How do u guys determine what gear ratios is fastest for a particular track? Do u try the stock setting first, then time the laps, then change different gear ratios and time the laps? Or u remove the second speed spur and pinion, try different first speed spur and pinion combo and time the laps to find out what is the fastest first speed gear combo, then try second speed gear combo likewise?
raceblast is offline   Reply With Quote
Old 09-12-2006, 07:04 PM   #14
Tech Master
 
Tire Chunker's Avatar
 
Join Date: Feb 2005
Posts: 1,241
Trader Rating: 16 (100%+)
Default

Quote:
Originally Posted by rcjayy
thanks, you guys are awesome and im getting a better understanding now, I posted this in the mugen mtx 3 thread and I didnt get many replies (I guess everyone has a mtx 4 now ) the last thing I need to figure out is there a way to look at the gears and tell which ones are 1.0 and .8 because the guy that sold me the car gave me a mixture of both and I dont want to mix them or I will really have problems.
You will need to count the teeth, I then took a xacto marked last number of pinion v for 25, ll 22 ect.........

I have attached a link that should help you figure out which gears are which.
I run a prospec .8 and a plain mtx-3 for my back up 1.0 it was a pain until I marked the pinions.
http://www.mugenseiki.com/mtx3-gearratio08m.pdf
Tire Chunker is offline   Reply With Quote
Old 09-12-2006, 07:25 PM   #15
Tech Apprentice
 
Join Date: Nov 2003
Posts: 80
Default

Quote:
Originally Posted by Tire Chunker
You will need to count the teeth, I then took a xacto marked last number of pinion v for 25, ll 22 ect.........

I have attached a link that should help you figure out which gears are which.
I run a prospec .8 and a plain mtx-3 for my back up 1.0 it was a pain until I marked the pinions.
http://www.mugenseiki.com/mtx3-gearratio08m.pdf
thanks, OK - from what I understand by counting the teeth what ever chart it falls under (1.0 or .8) thats what pitch it is?
rcjayy is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Can somebody please explain this to me? sho .21 R/C Racers 4 Christ 222 11-18-2011 03:06 PM
PLZ explain me this! hrnts69 Radio and Electronics 0 02-17-2008 10:45 AM
can someone explain gearing to me!? nc racer Electric On-Road 13 08-24-2007 06:37 AM
Can someone explain... squarehead Onroad Nitro Engine Zone 3 02-11-2005 06:45 PM
Is it possible to even explain to someone why you need more than one car? LosiFromHell986 Chat Lounge 32 05-17-2004 05:15 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 05:19 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net