haywyre

Help? ? new to 1/10 touring. I have a Mugen car, been running the 1/8 scale car for a long time. My 1/8 scale car has a rear spool. Pin the trigger, the rear will follow the front through.
What do I do with the rear diff? 100,000 lock it up or 3000 and let it work. with the rear locked, pin it or do I run 3000 and roll it ?
How does the different weights of diff grease effect the handling of the car, lose ,tight ,push, on power stearing, turn in.
I will be running the car on a treated surface. HAYWYRE

ChrisF

I guess this one is a matter of chassis tuning, track condition and personal preference.

If you want your sedan to handle like an 1/8th scale, my guess is a tight rear diff would be in order. A locked diff? Maybe not. It would be pretty hard to drive on all but a super sticky, smooth track.

I think most folks are running somewhere in between 30,000 - 250,000 grease. I suggest starting with 100,000 and playing with setup of the car.

This is one of the reasons I decided to pickup a Serpent 710: 2.5mm hex changes from 30,000 - solid with a few turns

rjl

Touring bodies don't have the down force to allow the use of a solid axle on all but very high bite tracks, even then the car will shimmy through high speed corners and don't tend to give the fastest lap times. On smaller tracks try 10-30,000, on larger tracks go harder. This is just a generalization and you will need to test.

V-One S

I believe it goes this way...
Lock the front, and rear open, it will want to under steer, but accelerate in a straight line pretty good...
Open front and lock the rear, it will slide the rear out (over steer) when trying to put the power down, and even just coasting through corners... but SHOULD accelerate very well in a straight line...
But a friend had his setup the second way, it was a matter of full throttle, even in a straight line and it stepped out majorly... (front diff would just break traction...

So its a matter of getting them evenly balance...

drfritz

Or try running the same wieght in both front and rear diffs, was running 30000 in the evo on a med size med grip track ad the car felt very nuetral.

eddiethefish

well said.

haywyre

Do any of you racers run a size difference between front and rear 3,4,5mm? HAYWYRE

Tabushi

iTrader: (1)

My usuals setups right now are ...

- Full solids
- Front solids rear 30.000 diff
- Front 100.000 diff rear 30.000 diff

And all work great !

ChrisF

Most sedan racers only use a split as a function of disproportionate tire wear (rears wearing faster). I did read on this forum about someone changing the internal ratio to allow the use of larger rears without overdriving the car.

I believe as a general rule though, most sedan drivers only use a small split (.5-1.5mm) to account for tire wear on a long main. Ideally though, you try to setup the car with same or similar shore tires so that you get even wear.

kreidel

iTrader: (2)

What size are the tracks you run at? Are they large or more technical?

ChrisF

haywyre:

Can you clarify if your sedan has either a front diff or one-way? That would make a difference in recommended setup.

haywyre

We run mostly large tracks, the smallest being Fastlane Hobbies in KC , its about 130x60,some tracks can get can get as big as 200x120. I am running a one way in the front. The tracks are fast and the boards are hard. the key to this Heart of America racing is to be able to adapt to different tracks in different Cities. that is why I am trying to garner as much info as I can. HAYWYRE

rjl

Tyre diameters depend on front to rear drive bias, if 1:1 the sizing is determined by wear rate. I true my fronts so that I have slight overdrive at the end of the race, usually.