Swing Arm ?

[RACR_73s]

Could someone please tell me what moving the swing arms up or down on the chassis will do to the car? I have an 08 Rayburn combo car and need to tighten entry(alot) and nothing Rayburn has said has helped and can't get anyone to tell me what moving these will do? ~Thanks~

[racin6mod]

they control forward bite the upper bars going back control the rearsteer. has cj told you to go to a 6 or 7 inch offset wheel on the rr or to adjust the wheel base on the r side.our car was way to tigt going in so we ended up spacing the rr out to loosen it up on entry.

[RACR_73s]

they control forward bite the upper bars going back control the rearsteer. has cj told you to go to a 6 or 7 inch offset wheel on the rr or to adjust the wheel base on the r side.our car was way to tigt going in so we ended up spacing the rr out to loosen it up on entry.

Moved rearend left 1" and LR swing arm is 1" longer than RR.
LF 650 RF 450
LR 350 RR 500

[dirtdiggerracing]

try pulling rr foward to shorten rr wheel base ! and may also try more comp. in lr shock! do you have 2 10/90 shocks on top of rearend ? is it good center off ? is it slamming down ?

[RACR_73s]

try pulling rr foward to shorten rr wheel base ! and may also try more comp. in lr shock! do you have 2 10/90 shocks on top of rearend ? is it good center off ? is it slamming down ?

My rr swing arm is as short as it can go @ 15" and the left is 16". I have 2 of the shocks Rayburn uses on top of the rear end. I am going to use a 7/2 shock on LR this Sat. Yes its good center off, Its picking the LF up on throttle and doesnt put it down until I let off. Someone on here said raise the ride hight and I did and it pulls the LF up so high I can't see the car below me so I am getting away from that. Somebody else suggested dragging the brake entering and it helped a little but made me slower.

My problem is corner entry and I want to know what changing the swing arms on the chassis will do??????

~Thanks~

[washeduptoo]

I'm a mod guy but it should work the same, you can lower the rr forward bar down on the chassis to tighten up the car on entry. We had to reset the ride ht and scale numbers when we did that. You could use a heavier spring to help entry. On a mod, when you raise the forward bar on rr it increase forward bite and loosens and downward on frame does the opposite. The rearward bar up on frame tightens car and downward on frame increase forward and loosens. This again was on a mod, but it should be close to what a late model does IMO.Maybe this helps some and good luck.

[dualdj1]

Give me a little more detail on your setup. Is this when it's tacky or slick? you runnin up on the bank or down on the flat? Where is the pull bar at? how are your trailing arms set on left and right? J-bar puple bar or left side straight bar?

And does it feel loose letting off coming in, or when you're picking up the throttle?

If you're still running swingarm RR I'd consider going to Z and putting the shock/spring on the birdcage, see if you like that better. start off with like a 275-300.

[MasterSbilt_Racer]

Give me a little more detail on your setup. Is this when it's tacky or slick? you runnin up on the bank or down on the flat? Where is the pull bar at? how are your trailing arms set on left and right? J-bar puple bar or left side straight bar?

And does it feel loose letting off coming in, or when you're picking up the throttle?

If you're still running swingarm RR I'd consider going to Z and putting the shock/spring on the birdcage, see if you like that better. start off with like a 275-300.

I agree. Going to z on rr would immediately help with the spring layed in. Then you can lower the rr swing arm without effecting ride height/bite as well.

[RACR_73s]

Give me a little more detail on your setup. Is this when it's tacky or slick? you runnin up on the bank or down on the flat? Where is the pull bar at? how are your trailing arms set on left and right? J-bar puple bar or left side straight bar?

And does it feel loose letting off coming in, or when you're picking up the throttle?

If you're still running swingarm RR I'd consider going to Z and putting the shock/spring on the birdcage, see if you like that better. start off with like a 275-300.

It never feels tight going in(tacky or slick) but is extremely loose in the slick. Start with trailing arms in positions according to Rayburn and then drop LR down 4(bottom) and have moved RR up to top(2 I think) and have left it alone(Can't tell any difference). On purple bar except for one week on J(car was still extremely loose and lost forward drive) so went back to purple bar. Race @ Peoria which lends it self to alot of bottom but have tried moving up and makes no difference.

Going to do what CJ says this week
put 400 on RF
compression sock on LR
change the swing arm lenghts to 15 1/2" on RR and 15" on LR

~Thanks~

I have thought of going to birdcage on RR...what will that change? How will I be able to use the "swingarm" bar to adjust the car with it on the Z?

[dualdj1]

Yeah knew you were at peoria, wasn't sure if you were trying high or low groove.

Going to the cage will tighten it, because it moves your moment center left, which lets the car roll more. Remember though that your spring rate needs to be about half that of swingarm, i like about a 200-250 there. You can still leave the swingarm on there and just mount the shock to the cage with no probs.

How's the purple bar set? clear down on the frame?

Where's your pull bar at? Further left is more drive, and we go clear out with it at times.

softer right front will help, we're goin down to 450, but i was thinking about trying a 400. And they seem to respond well to adding rear weight if you have some.

That RR bar won't really affect your drive much, just how much the tail is hanging out as you corner. As banked as Peoria is you can put it to 2 on the slick.

let me know how the compression shock helps, been contemplating getting one of those, and how well the soft rf does.

[RACR_73s]

Yeah knew you were at peoria, wasn't sure if you were trying high or low groove.

Going to the cage will tighten it, because it moves your moment center left, which lets the car roll more. Remember though that your spring rate needs to be about half that of swingarm, i like about a 200-250 there. You can still leave the swingarm on there and just mount the shock to the cage with no probs.

How's the purple bar set? clear down on the frame?

Where's your pull bar at? Further left is more drive, and we go clear out with it at times.

softer right front will help, we're goin down to 450, but i was thinking about trying a 400. And they seem to respond well to adding rear weight if you have some.

That RR bar won't really affect your drive much, just how much the tail is hanging out as you corner. As banked as Peoria is you can put it to 2 on the slick.

let me know how the compression shock helps, been contemplating getting one of those, and how well the soft rf does.

Purple starts @ 2 1/2" and then goes to framerail at feature but may start at frame this week.

Pull bar left 1 to start then 1 more left for feature.

What do you mean by put it(swingarm bar?) on 2 for slick? 2 from top/bottom?

~Thanks~

[dualdj1]

sorry meant your right trailing (back) bar on 2 (top of the 3 that are together, not the clear top).

down with purple should be tighter, lowers roll center.

And most Rayburn guys I've talked to are now running right side on the bird cage, and like it much better. swing left still, and z right.

but I'd try the changes CJ says, that should help you going in. if it's still loose rolling in, you can stiffen LF too, which will help keep it good coming out. Taking some bite out should help it going in too.

[britt77]

Try raising the purple bar as high as you can get it on the chassis, make sure you leave clearance for the fifth arm. Helped me out alot in the slick.

[stevo]

Higher pan bar on frame more side bite.

[racin6mod]

the purle bar comes of the right side frame rail so you adjust the opp. of say a j-bar(down to tighten up to loosen) we ran double swingarm and a couple other rayburn guy's at our track ran the z-link rr. they ran hard in the heats and were tough but we ran off and left them in the features.the track champion was also on double swing arm with the long lr top bar. what's steve l on over at peoria this year?