weight will affect the acceleration of the car but it has very minimal effect on the top speed.
The aerodynamic drag, friction, power loss thru the drivetrain are three of the biggest factors that affect the top speed (assuming power is constant).
So assuming your TC is a 4WD, and the TC shell usually has a much higher aerodynamic drag than the 12th scale cars.. so the top speed of the TC will be lower if both car has the same motor, same battery and same rollout.

Yeah it is a 4wd TC with a rollout of 45.126mm. I was hoping that as a starting point I would try that number on my 1/12th but if as you say the lower voltage of the battery (yes it is 4 cells x 3700mah) will not be countered by the lower weight of the car.

Then I just guess I'll have to take a stab at a suitable rollout. Somewhere on these forums someone suggested a 38/100 spur combo but that would give a rollout of 59.6 which seems rather high for a 540 considering the hightest I've run was 50.8 at the nationals and that was rather hot lol.

now i have to say i'm new to 12th as well so what i said maybe completely wrong.. but the 12th is much lighter, got less friction and has much lower drivetrain lost so in theory you should be able to run a much larger rollout. Also because the fact it's only powered by 4 cells, the motor can take more punishment than when it was powered by 6 cells..

but yeah it's just my thoughts.. so correct me if i'm wrong.

btw, are you from Auckland ??

Well what you said makes sense to me, the less strain because of the 4 cells never occured to me. :blush:

I'm from the Manawatu club.

hey guys, i want to get parts for this car. it's a 1/10 pan car, some of you might remember it. do you know of anybody or any website where i could find parts? thanx

I have seen this car before but have no idea where to get parts. You might try asking the guys on the "10th Pan Car " thread on the "Oval, Larger Scales and More" forum here on RC Tech. There are a few racers over there that are quite knowledgable about these cars.

Let me offer something from my experience. When you get the 1/12 scale car fully competitive and efficient, your fast lap should be around .3 seconds faster than the touring car. I suggest pinion/spur combinations of 28/100 to 31/100 if the straight is between 70 to 90 feet long. This is using the Trinity stock motor based as the Monster Horsepower motor. The Epic Stock 27T motor is about 2-3 pinion teeth lower than the MH. The Trinity P2K2 is maybe 1-2 pinion teeth higher than the MH. I don't know what you mean by the Mabuchi540, but if it is different than the ROAR 27 turn stock motors I mentioned about, then there will be some deviation to this info. What is the spec to the Mabuchi540 so I can iterate this information. Hope this helps.

David,

I think he's referring to something like this:

http://www.mabuchi-motor.co.jp/cgi-b...AT_ID=rk_370sd

I haven't seen one of these in about 18 years! :lol:

Brian, I got your input. I think if they are running this motor with 3700 batteries, they could run a 15 minute race. I am hoping they will see the advantage to moving over to motors such as the ROAR stock formulae so they can experience the wonderfull performance these motors offer. Bare in mind that the current ROAR stock motors run as fast in the current 1/12 chassis with the new batteries as the full modified motors ran in 1/12 scale in 1996. I am privy to data from some radar measurements that support that.

Believe it or not we actually have two classes here that use that kind of stock motor.

http://www.mabuchi-motor.co.jp/cgi-b...D=rs_540rhshsf This is the exact motor we use :)

As far as TC goes we have Stock(motor above), ProStock (like your stock), then Modified (12T limit), and Super Touring (Modified using lola type bodies). The other "stock" motor class is mini, as in Tamiya M-03's. Then there's pro12, any motor, 4 cell only. Most run 9 or 10T in pro12 here :D

So yeah, lots to choose from :cool:

Yeah but......
 

I'm too old for that lol. According to our 1/12th rules the only types you can use are any limit as you say or 540 stock types.

"opened end bell with replaceable brushes or 540 stock as mentioned in the off-road rules"....or something like that anyway which technically would mean if I wanted to use a Tamiya sports tuned in an official event I couldn't. :lol:

So until I can be bothered/afford the extra work looking after a mod requires it 540 stocks for me. :p

As far as the 15 minute races are concerned, actually I think 19 minutes might be possible as I can get 8 min now at race speed out of my TC with 1500mah packs. :D :ha:

Yip 540 stock is all good, as long as it fits in the 1/12th, having never tried I have no idea if it would.

Hope you enjoy it as much as I do :cool:

Ok guys, I'm new to 12th scale.
I just aquired a new never ran Yokomo YRX-12WE, is this a good car?
Any where I can go for set up info on this car?
And any mods or aftermarkets I should do or get for the car?
Thanks
Dayton

I have a YRX-12WE that I have raced for the last couple of outdoor seasons. It is a great asphalt car. My team mates are both running hybrid versions of the same car and we all agree it's the best car we've tried outdoors. Post what kind of track you are running on, and whether it's stock or mod and we can give you a starting set up.
There are some must do modifications for the car, and some that are nice.
First and most important is to replace the small ring diff. The stock one is really pretty and all but small ring diffs don't work well. I put an IRS big ring diff on the car so I could have blue. I converted my car to damper tubes, I like that tuning possibilities better with that set up. I had trouble finding Yokomo t-bars so I switched it to an Associated t-bar and pivots (Yokomo and AE pivots have different bolt patterns, but they both mount without modification). This season I replaced the t-bar with a Silva spring steel one; it's nice not to have to worry about breaking the t-bar.

What are the spring steel t-bars like? Do they handle the same as the normal ones, say equivalent to a .075"? I've thought about getting one but will it ruin the handling of the car?