Adding of ballast weights in TRF419X
 

Hi guys

Just wanna check with you that in the TRF419x manual, there is this section pertaining to adding of 3 ballast weights to the chassis. The manual states that adding of the weights if necessary. In this case, It is not mandatory to add these weights. May I know under what circumstances do we need to add these 3 ballast weights, and what method(s) to use to measure the chassis' weight so as to determine how many and what ballast weights to add?

Thank you.

Depends on where you race. If there is a minimum weight, you might need the ballast to get there.

1350g is common for touring cars. This is now the IFMAR weight as of this year.

Weight is measured as complete and ready to go including transponder, battery, body, body clips etc. As you would place it on the track.

Thank you for your prompt and concise answer. If you didn't say it, I wouldn't know as the manual just state use the weights if necessary.

I am in need of a good crc ft2 carpet setup for the 419x. Had the first club race on it and had way too much front end bite and way too much overall grip. Was very hard to drive. Any thoughts??

lower diffs
 

You can run the diffs in low position . I'm currently running my front diff in high position in front and low in the rear . I was lacking front grip and had to much rear grip .

Hi,

Can I get a bit more explanation how diff position effects the car handling and why?
I never changed the "position", just realized this setting change on 419x. I just used for tightening the belt, 1 or 2 step change from KIT setting on 419.

Thank you
Marton

It has to do with the rotating mass of the diff high or low. The higher the rotating mass on a car the higher the cog.

If you change cog you have to tune your roll center too. The result is more or less grip on the affected axle.

Other effect and the most important, is the geometry of the axles (angle of the dogbones). If you lower the diff, you have less on power traction, because the affected axle wants to straighten itself out and press the arm/tire into ground, when you accelerate. If you raise the diff, the effects are vice versa.

It's one of the many tuning options the car offers to you. But tuning the height of diffs is one of the last fine tuning options I would do. Better do the right basic setup first...tires, springs, shock oil, hinge pin blocks etc.

Regards.

Finally got my trf419x home last night.
Got a question about spur and pinion. Kawada 64 pitch. Do spurs between 93-97T with pinions 36-42T physically fit? Want to keep FDR minimum at ETS rules of a min 4.5 on outdoor tracks

To get close to 4.5 you'll need 95/39 and that fits.

I know, but will it fit? Is there room for this? Or should I try something like 73T / 30T ? It don't have to be spot on, but can't have lower FDR than 4.5.

It will fit.

Most 419 drivers use 100/41 combination.

Thanks man!

SMJ springs, will these fit?
http://www.rcmart.com/speed-master-j...3-p-67387.html

What kind of spares do you guys have with you all the time?
C-hubs, uprights, arms, belts and?

I just got those springs from RCMART and they fit the 419x.

As for spares, I have the usual stuff from your list plus diffs, front outdrive, complete DCJs, axles blades, kingpin bushings and turnbuckles.

ordered a lot of things I didn't have.
So hopefully I will not need to order too much in the near future.
Thanks for the help.

Now I need to put it all together some day.

Im using the same springs on my 419x. They great springs