Associated RC12R5
#2236
Smallest spur you can fit to any 12th car is a 76T (64DP). Below that you can't get the gear in the diff!!
The largest pinion depends on how far forward you can get the motor. Limited in a CRC, miles of room in a BMI DB12RR. Not sure on a 12R5.
Gearing is dictated by the motor. If you have a 17.5, then it's a 76 in order to get the ratio you need. A 13.5 will need an 80 or 84T, and 10.5 or above you can use an 88T or 96T. Look to the ratio you want to run and the tyres sizes you want to use before deciding on a range of pinions.
Your spur and pinion sizes will depend on the motor first, the tyre size second and the room in the pod third. HTH
The largest pinion depends on how far forward you can get the motor. Limited in a CRC, miles of room in a BMI DB12RR. Not sure on a 12R5.
Gearing is dictated by the motor. If you have a 17.5, then it's a 76 in order to get the ratio you need. A 13.5 will need an 80 or 84T, and 10.5 or above you can use an 88T or 96T. Look to the ratio you want to run and the tyres sizes you want to use before deciding on a range of pinions.
Your spur and pinion sizes will depend on the motor first, the tyre size second and the room in the pod third. HTH
#2237
excesive tire wear
Just a quick question
I run on a track with med traction and was wondering what would cause excesive left rear tire wear. (when i say excesive i mean i can start with a tire at 1.7 and finish with about 1.63) We have about an equal amount of high speed corners left and right. Could it be my diff being to tight to loose? pre load on side springs?
any help would be great!
Thanks Jason Hunt
I run on a track with med traction and was wondering what would cause excesive left rear tire wear. (when i say excesive i mean i can start with a tire at 1.7 and finish with about 1.63) We have about an equal amount of high speed corners left and right. Could it be my diff being to tight to loose? pre load on side springs?
any help would be great!
Thanks Jason Hunt
#2238
So I just took apart the diff on my r5 that I bought used, and noticed that two of the ball bearings are silver, and seem ever so slightly larger than the rest, which are black. This also seems to have the effect of making the spur gear wobble a bit side to side when everything is put together. Wtf? Has anyone seen this before?
#2239
Time to replace your diff balls and rings.
#2240
Tech Elite
iTrader: (64)
Join Date: Jun 2008
Location: Conducting aggressive board meetings at my local track
Posts: 3,301
Trader Rating: 64 (100%+)
Just a quick question
I run on a track with med traction and was wondering what would cause excesive left rear tire wear. (when i say excesive i mean i can start with a tire at 1.7 and finish with about 1.63) We have about an equal amount of high speed corners left and right. Could it be my diff being to tight to loose? pre load on side springs?
any help would be great!
Thanks Jason Hunt
I run on a track with med traction and was wondering what would cause excesive left rear tire wear. (when i say excesive i mean i can start with a tire at 1.7 and finish with about 1.63) We have about an equal amount of high speed corners left and right. Could it be my diff being to tight to loose? pre load on side springs?
any help would be great!
Thanks Jason Hunt
Gonna go over the obvious list here. Please do not take offense.
Are you seeing this wear inside of an 8 minute run?
Do you rotate your tires from left to right after every run?
I'm guessing your track runs counter clockwise?
If this is the case there will always be 4 more right turns then left. No matter what.
The extra right turns needed to complete the course will cause the left tires to wear sooner than the right. This is why it's important to rotate the tires every round.
If you see this type of wear inside of 8 mins, you may want to go over the setup as well as how you are entering the turns. If your car is sticking the front end and sliding the rear, this may cause excessive wear.
Some more info on your setup may help.
#2241
Tech Addict
iTrader: (2)
So I just took apart the diff on my r5 that I bought used, and noticed that two of the ball bearings are silver, and seem ever so slightly larger than the rest, which are black. This also seems to have the effect of making the spur gear wobble a bit side to side when everything is put together. Wtf? Has anyone seen this before?
Wobly spur is a good thing. But not "to much". It must sit free between the diff plate's or else the diff will not run as smoot as it should be. The platse wil then be touching the spur gear which causes friction. But make sure you only use 1/8 balls and no balls are bigger or smaller, that's not a good thing...
Somewhere in the 1:12 scale topic these a good building manual for your 12th scale diff, try folowing that :-).
Best Regards,
Robert
#2242
Tech Addict
iTrader: (2)
Gonna go over the obvious list here. Please do not take offense.
Are you seeing this wear inside of an 8 minute run?
Do you rotate your tires from left to right after every run?
I'm guessing your track runs counter clockwise?
If this is the case there will always be 4 more right turns then left. No matter what.
The extra right turns needed to complete the course will cause the left tires to wear sooner than the right. This is why it's important to rotate the tires every round.
If you see this type of wear inside of 8 mins, you may want to go over the setup as well as how you are entering the turns. If your car is sticking the front end and sliding the rear, this may cause excessive wear.
Some more info on your setup may help.
Are you seeing this wear inside of an 8 minute run?
Do you rotate your tires from left to right after every run?
I'm guessing your track runs counter clockwise?
If this is the case there will always be 4 more right turns then left. No matter what.
The extra right turns needed to complete the course will cause the left tires to wear sooner than the right. This is why it's important to rotate the tires every round.
If you see this type of wear inside of 8 mins, you may want to go over the setup as well as how you are entering the turns. If your car is sticking the front end and sliding the rear, this may cause excessive wear.
Some more info on your setup may help.
Make sure you rotate your tires after every run...
Also make sure your car is not "drifting" or "sliding" on the left turn corners. Oversteer wears the tires more then just running....
How long do you soak your tires, and with what additive? longer soak will make the tires wear more...
Best Regards Robert
#2243
+1
Make sure you rotate your tires after every run...
Also make sure your car is not "drifting" or "sliding" on the left turn corners. Oversteer wears the tires more then just running....
How long do you soak your tires, and with what additive? longer soak will make the tires wear more...
Best Regards Robert
Make sure you rotate your tires after every run...
Also make sure your car is not "drifting" or "sliding" on the left turn corners. Oversteer wears the tires more then just running....
How long do you soak your tires, and with what additive? longer soak will make the tires wear more...
Best Regards Robert
Front End
DBL Pink Front tires 1.65
.020 Spring
10 degree with caster shims to the back
widend the front by 1mm
10k on king pin
Batt In forward position
Center Shock
Red Spring
30wt oil
blue side springs
25wt side shock
Rear Tires are either pink or yellow depending on the night at 1.70
Soak wise i use roughly about 10min and wipe right before the run
I always rotate the tires on front and rear. And this tire wear is threw a full 8 min main or qualifier.
One theory i have is that the rear tires are to soft? could this be a possability?
Thanks Jason Hunt
#2244
Tech Initiate
let me ask again...
is anyone running a sedan or nascar style body? if so what you runnin'?
#2246
Tech Addict
iTrader: (2)
Sorry guess i should posted more infor lol sorry
Front End
DBL Pink Front tires 1.65
.020 Spring
10 degree with caster shims to the back
widend the front by 1mm
10k on king pin
Batt In forward position
Center Shock
Red Spring
30wt oil
blue side springs
25wt side shock
Rear Tires are either pink or yellow depending on the night at 1.70
Soak wise i use roughly about 10min and wipe right before the run
I always rotate the tires on front and rear. And this tire wear is threw a full 8 min main or qualifier.
One theory i have is that the rear tires are to soft? could this be a possability?
Thanks Jason Hunt
Front End
DBL Pink Front tires 1.65
.020 Spring
10 degree with caster shims to the back
widend the front by 1mm
10k on king pin
Batt In forward position
Center Shock
Red Spring
30wt oil
blue side springs
25wt side shock
Rear Tires are either pink or yellow depending on the night at 1.70
Soak wise i use roughly about 10min and wipe right before the run
I always rotate the tires on front and rear. And this tire wear is threw a full 8 min main or qualifier.
One theory i have is that the rear tires are to soft? could this be a possability?
Thanks Jason Hunt
Yellow is pretty soft, and wears hard, when the grip is high.
Best Regards
Robert
#2247
thanks for the idea i appriciate the help!
Jason Hunt
#2248
2010 1/12 European Championships
So far so good for the A-team at Euros! 1st and 2nd on the grid in the modified class after 2 rounds!
There is coverage on RedRC. Maybe more coverage somewhere else, Im not sure.
There is coverage on RedRC. Maybe more coverage somewhere else, Im not sure.
#2249
Is the setup a few posts earlier for 17.5??? I have tried looking around for 17.5 setups and havent found many? Can someone send me a link to one.
Thanks!
Thanks!
#2250
Tech Adept
I have just recently bought myself a 5.1 and I m seeking some advice on setting my little car up given the fact that the 1/12 class in Greece is currently non-existent. In order for you to help me out I have to give you as many facts as possible. So, our first race will take place on this ( http://www.elmegallery.gr/displayima...album=35&pos=4 ) track and we currently dont know which layout we will use. Certainly we will have to use one of the two straights which are approx 65-85 feet long, depending on which one we run. A bit bumpy when compared to the tracks you run in the UK and the US.
Traction should be considered low, as on the same day, a 1/10 touring class race will take place too. Otherwise, I would consider it extremely low as the track is not treated with any traction stuff at all.
Mod motors are allowed and my pit bag carries a 4.5, a 5.5 and a 7.5 with 1s lipo and an ESC choice between SXX TC and SXX stock.
Tyre choices are limited to CRC normal and pro-cuts.
Given these facts what equipment would you run on this track? What roll-out would you consider as a good starting point? What tyres?
Any help on this would be very much appreciated.
By the way, keep in mind that given the amateur level of all of us, anyone who manages to have a consistent car, even if it is a bit slower than the others, will definately win this race by miles.
Traction should be considered low, as on the same day, a 1/10 touring class race will take place too. Otherwise, I would consider it extremely low as the track is not treated with any traction stuff at all.
Mod motors are allowed and my pit bag carries a 4.5, a 5.5 and a 7.5 with 1s lipo and an ESC choice between SXX TC and SXX stock.
Tyre choices are limited to CRC normal and pro-cuts.
Given these facts what equipment would you run on this track? What roll-out would you consider as a good starting point? What tyres?
Any help on this would be very much appreciated.
By the way, keep in mind that given the amateur level of all of us, anyone who manages to have a consistent car, even if it is a bit slower than the others, will definately win this race by miles.