stiltskin

iTrader: (103)

If that's how the Master runs it, there's no need to go any further. That seems to be the popular way to position the Tekin around here also.

rdx_arthur

hi,

i have just found out we changed racing from stock 27 to stock 19 handout, we got training on friday and racing this comming sunday, anyone with advice for starting gear ratio so i know where to start with the little time i have got looking for the right pinions(0.48) i got 78 on the car right now.

we run 3300 and foams on asfalt and it is pretty hot down(allways over 100F) here so it is heavy on the car and electronics!

well let me know if you got some advice

bye

arthur
from curacao

subman

iTrader: (4)

See this link for a roll out chart roll out chart
I think a 30-32mm roll out is a good start!

Obsidian

iTrader: (10)

Greetings All,

Tonight I'm going to try to minimize My RDX's bump steer. Any suggestions on where and how much to shim.

Cheerz

koabich

Use the ball connectors from the rear shock tower for the ball connectors for the steering knuckles!

Obsidian

iTrader: (10)

Thanks for the tip.

Obsidian

iTrader: (10)

Hello All,

Anyone know where I can find 4deg caster blocks. My LHS says the supplier is out of stock.

Cheerz

Advil

iTrader: (19)

Hobby Town San Jose had some in stock last time I was there.

RC_Woody

maybe be a stupid question, but what is bump steer? and why do you want to minimize it?

T1Raycer

Defenition:

The tendency of a vehicle to suddenly veer or swerve to one side when hitting a bump or dip in the road. The condition is caused by uneven toe changes that occur as a result of the steering linkage or rack not being parallel with the road surface. This causes the wheels to change toe unevenly as the suspension undergoes jounce and rebound.

Robfo

Bump Steer is when the front wheels toe in or out as the suspension compresses.

The bump steer on the RDX gives toe in as the front compresses which makes the car easier to handle while cornering. It can make the car feel as if it looses steering under heavy cornering though.

Personally i have added about 4mm of spacers under the knuckle on the steering link.

JINX

koabich

Bump steering is the effect that bumps and suspension compression have on steering. Basically, a car that has bumpsteer will be effected in the following ways:
As the cars suspension is compressed (for whatever reason, hitting a bump or leaning in a turn), the link that attaches to the steering knuckle acts as if it is shortened when the suspension is compressed and thus adds toe out to that side of the car where the suspension is compressed causing in a loss of steering.
For example, as a car leans right in a left hand turn, the right side suspension compresses, having the effect of shorting the steering link on that side adding toe out to the right side tire. Again you are turning left and want the wheels to point left but Bump Steer will cause the right wheel to point more outwards than normal causing a loss of steering.

With you car laying flat on a table push down on the front shock tower. You should notice the wheels as they compress exhibit toe out. The more the suspension is compressed the more the tires toe out.

To lessen the effect of bumpsteer, most people lower the ball link on the steering knuckle. For the RDX the most common way to do this is to use the ball connector on the rear shock towers on the steering knuckles as well.

RC_Woody

OK I understood most of that, at least about the compressing suspension causes toe-out, but doesn't toe-out give you more steering not less?

Woody

Big Rigg

But notice that it's the outside wheel that get's compressed the most, causing it to toe out (against the direction of the turn) hence less steering

koabich

Constant toe out does give you more initial on-power steering. But remember that bump steer gets worse as the suspension compresses. So think of it like this: Going into the turn, you have minimum bump steer but as you reach the apex of the turn, your car leans over more and more causing inconsistant toe throughout the turn. This leads to inconsistant handling because though out the turn, your toe is constantly changing.