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  need just a little more w/ 4 bar z link

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This topic was originally posted in this forum: Modified Tech Talk
Author Topic:   need just a little more w/ 4 bar z link
jmsmodfan
Member
posted April 18, 2004 09:02 PM     Click Here to See the Profile for jmsmodfan     
we practiced last night with this set up for the first time. 4 bar left with spring clamped up in front of axle. Z link right with spring behind. The car is a DW8. Lf 650, Rf 750, Lr 225, and Rr 175. Car had right at 58% rear and 51 1/2% cross.

The car felt real good going in and through the corner. Towards corner exit the a** end was kind of wanting to come out from under. Had to let out of the gas just a little to straighten out and then it was hooked up hard all the way down the staight away. Car is extremely close but am wondering what we could do to keep the a** from wanting to come out from under.

The driver felt that the car had the right amount of rear steer because it was not tight at all through the corner. He felt the car had awesome forward bite but just lacked a little side bite.

We are running a j-bar and a qwickar torque absorber for the torque link. The torque link is in the center of the rearend. I did put a little more angle in the j-bar and it did help a little. Would a short bar in front be better?

Thank you

[This message has been edited by jmsmodfan (edited April 18, 2004).]

NJantz
Member
posted April 19, 2004 07:39 AM     Click Here to See the Profile for NJantz     
You might try a stiffer RF spring or stiffer LR spring. Also could try adding a little rear weight.


dirtbuster
Member
posted April 19, 2004 10:11 AM     Click Here to See the Profile for dirtbuster   Click Here to Email dirtbuster     
Are you sure its a sidebite issue if its only on corner exit? I would think changing panhard bar angles would help entry more than anything. Butif you think you need more sidebite then yes I feel a short bar in front and low would help get more sidebite. Try a medium bbar about 16" first and see if that helps then go to the short bar.

[This message has been edited by dirtbuster (edited April 19, 2004).]

Wauge28
Member
posted April 19, 2004 01:23 PM     Click Here to See the Profile for Wauge28   Click Here to Email Wauge28     
Is the 4 bar on the LR new to this driver? If yes, then think of this. Off the gas the car turns in nice, through the turn and as soon as you pick up the gas, the rearend is rear steering to the wall and feels loose. Even though he felt OK in the middle and probebly doesn't think he has too much rear steer, I'll bet he does. Take some angle out and see if it still turns. Another thing, if he is new to the 4 bar, this is kinda normal. It feels like the car is loose and it is sometimes just steering.

Clamped up, that cross and that rear %, I have a hard time believing it is loose. ???... My bet is too much rear steer.

jmsmodfan
Member
posted April 19, 2004 01:47 PM     Click Here to See the Profile for jmsmodfan     
This is a totally new setup to the driver. We ran a short 2link before. The short 2link did however hike up like a 4 and create quite a bit of rear steer.

I do not want to change much because it is so close. I may try a stiffer LR or RF spring though.

I figured with to much rear steer the front end would want to go to the wall not the rear.

Sometimes I think our driver doesn't actually know if it is tight or loose. He has a hard time telling us what the problem is. We pretty much have to pry it out of him.

Thanks for all the info.

dirtbuster
Member
posted April 19, 2004 01:50 PM     Click Here to See the Profile for dirtbuster   Click Here to Email dirtbuster     
Rear steer will try to make the rearend drive counterclockwise around the front which is why it may feel loose like the previous post stated. Once up on the bars and locked down it should be pretty static and he just needs to steer the front to keep it in front of the rearend. Maybe he just needs a little more time to get used to the feeling. IF you ask a lot of lot model guys they will tell you that the rearend does most of the steering, the driver just uses the wheel to keep the front end headed in the right direction.


2nd2none
Member
posted April 19, 2004 02:28 PM     Click Here to See the Profile for 2nd2none   Click Here to Email 2nd2none     
JMSmodfan check your PM's


Ego Racing
Member
posted April 19, 2004 06:45 PM