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This topic was originally posted in this forum: Modified Tech Talk
Author Topic:   Drop a hole
mod311
Member
posted April 14, 2004 10:01 AM     Click Here to See the Profile for mod311   Click Here to Email mod311     
On a 3 link swingarm if the right side swingarm is a hole lower that the left side, this will creat roll stear, correct?
What will happen when you pick up the gas?


mod311
Member
posted April 15, 2004 07:44 AM     Click Here to See the Profile for mod311   Click Here to Email mod311     
anyone?


Dman
Member
posted April 15, 2004 08:45 AM     Click Here to See the Profile for Dman     
Yes, it ill give you some roll steer.It will also drive the left rear harder /tighter when you pick up the throttle. Dman


zeroracing
Member
posted April 15, 2004 09:48 AM     Click Here to See the Profile for zeroracing     
Yes it will create some roll steer, also you will loose thrust angle in the rr. so it will be tighter overall, and you will loose seom forward bite.
your car would have more forward bite, it you floated the birdcage on the rr, and ran a rearward facing trailing arm. then run it at a downhill to back angle, and you will have more bite overall, and be able to play with even more rearsteer.
i have a 4 link lr swing arm rr and have the rr with alot of angle in the bars, and it rearsteers a TON.


Chad
Member
posted April 15, 2004 10:10 AM     Click Here to See the Profile for Chad   Click Here to Email Chad     
Moving the RR down a hole will actually decrease the amount of roll steer on the RR. As the static angle (at ride height) decreases (example- you drop down a hole on the frame mount), the amount of roll steer also decreases until you get to the point when the static angle is level, then as the chassis rolls it will actually shorten the RR wheelbase tightening it up. What are you trying to accomplish???


Wauge28
Member
posted April 15, 2004 01:11 PM     Click Here to See the Profile for Wauge28   Click Here to Email Wauge28     
Chad is right (hey Chad), The difference bewteen the left and right is much less important than the overall angle of each link. The angle of the front link is what will determine bite and rear steer. The more upward angle in the link the more bite and rear steer.

On the RR, if the link is at an upward angle, when the cars rolls in the turn it pushed down on that link then cause the link to PUSH the rearend BACK. That opens up the rearend and creates a loose rearsteer. If the RR bar is angled downward at static height, the car rolls and the bar PULLS the rearend FORWARD causing it to rearsteer tight.

Same on the left. The car will raise as it rolls and if the link is upward, the body roll will PULL the wheel forward and cause loose rear steer. If the bar is angled downward, it will PUSH the rearend back as the body rolls up and cause a tight roll steer.

Again, that was just the steer aspect. With a three link, I believe...I BELIEVE (you know how opinions are) that you gain more in the area of bite with bar angles than rearsteer. z-link is much more dramatic with a floated rear and another set of bars to play with.

Hope that makes sense???



2wildcrewguy
Member
posted April 16, 2004 03:17 AM     Click Here to See the Profile for 2wildcrewguy     
my idea might be way off base but .... my thinking is if u lower the rr trailling arm so that it is below the lr when u get into the corner the get body roll the trailling arm will push the right side frame down and it will cause even more body roll and the more the body rolls the higher the left side will raise and the more rearsteer. maybe that is what i have been doing and i got the left front to wheelie with 200# spring straight across in the rear.


mod311
Member
posted April 16, 2004 06:28 AM     Click Here to See the Profile for mod311   Click Here to Email mod311     
I was trying to accomplish rear stear. I want the car to roll over and turn itself and then pick up the gas to straighten it back up. Just an idea, maybe far .fetched


juliaferrell
Member
posted April 16, 2004 09:25 AM     Click Here to See the Profile for juliaferrell   Click Here to Email juliaferrell     
Yes, having rr lower will most definately effect body roll (primarily while on the gas). This is a very valid subject to learn to adapt to a persons driving style. That's why somethings work for some drivers and some things don't. If you pick up the throttle early enough or whether you have slow entry speeds, this change makes big difference!! What are you trying to make happen? (besides cross the checkered first)

... Rear steer does very little if nothing to planting the tires and creating traction.

mod311
Member
posted April 16, 2004 09:41 AM     Click Here to See the Profile for mod311   Click Here to Email mod311     
Maybe we should define roll steer? I thought roll steer steers you rear end toward the outside, lr foward rr back.


dirtbuster
Member
posted April 16, 2004 09:45 AM     Click Here to See the Profile for dirtbuster   Click Here to Email dirtbuster     
Rear steer may not plant the tires and create traction, but when used properly it will help turn the car without the tires breaking loose (especially dry slick) and keep corner speeds up so that on exit you are carrying more speed which makes it easier to power off the turn which gives the feeling of more traction.


zeroracing
Member
posted April 16, 2004 10:59 AM     Click Here to See the Profile for zeroracing     
yeah i made a mistake, was not paying attention, it will create less rearsteer with the rr down a hole.

and on a swing arm that has rearward links, the rearward bars make up the bite, mainly.

Wauge28
Member
posted April 16, 2004 12:01 PM     Click Here to See the Profile for Wauge28   Click Here to Email Wauge28     
Mod311

Rear steer is normally looked at as turning the rearend towards the wall to help turn the car in the turn. It is possible to have the car steer the opposite direction as well. I don't know when or why but it is possible.

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