Rr spring rate when using soft rf

[Dirtmod13]

Have had some success using a soft rf like the new rocket setup, but car is always too loose (but fast) Was wondering if by softening the rf, it needs a softer rr to compensate. I understand that roll couple theory would say after softening front and leaving the rear it would be looser.

[MasterSbilt_Racer]

Short answer: No. You would be shocked the RR springs some guys are running. It is more of a momentum setup.

[RCJ]

What r/r are some guys running?

[7uptruckracer]

Would not hesitate with a 350 RR but its a package deal

[billetbirdcage]

Would not hesitate with a 350 RR but its a package deal

Why so soft? (grin)

[7uptruckracer]

Also seen a dual stage that locks out to a 500


Why so soft? (grin)

[Matt49]

Also seen a dual stage that locks out to a 500

Excellent for hammer down track conditions. Free on entry, free on exit.

[7uptruckracer]

Excellent for hammer down track conditions. Free on entry, free on exit.
I was told they used it to prevent mid corner squat...not sure why but I've seen things on the RR I haven't ever seen it's exciting and frustrating it seems to be a lot like BBSS on asphalt and just as sensitive lol

[fastford]

any one seen a soft RR with a bump stop? I tkink it would work with with the proper shock , ie: soft comp and stiff rebound....

[MasterSbilt_Racer]

any one seen a soft RR with a bump stop? I tkink it would work with with the proper shock , ie: soft comp and stiff rebound....

I had a deal like that 3 years ago that worked very well at one particular track. 175# RR with a particular rollerskate wheel setup.

[7uptruckracer]

I saw a Cone bump on a RR the other week that Shorty setup. Car couldn't get in the corner.....

[MasterSbilt_Racer]

I saw a Cone bump on a RR the other week that Shorty setup. Car couldn't get in the corner.....

That can happen. LOL

[7uptruckracer]

That can happen. LOL

Yeah seemed to be getting on it way too late causing loss of side bite

[Dirtmod13]

Assuming that's for qualifying right? Can't be good for small track that goes slick for the feature can it?

[7uptruckracer]

Depends on the bump stop timing more RR spring can give you entry sidebite there are alot of variables. ALOT.

[MasterSbilt_Racer]

Assuming that's for qualifying right? Can't be good for small track that goes slick for the feature can it?

All about your rates and the timing. It can be anything you want it to be.

[bullittwrench]

I was on a 300 quite a while ago on a banked half mile. Tried a 400 for a few. Didn't have the rf technology we have now though.

[billetbirdcage]

I was on a 300 quite a while ago on a banked half mile. Tried a 400 for a few. Didn't have the rf technology we have now though.

Can't remember the year now, but it's been a while. Remember when James Ince left nascar and started building Late Models? The house car ran this for a little while:

LF 250
RF 500
LF 500
RR 500

http://emojipedia-us.s3.amazonaws.com/cache/4a/bc/4abc340cf5d893ff4bf6ebc17b29c221.png

[TheJet-09]

^^^ LR 500? I believe Ince is selling his jig/s on Racingjunk.

I assume among other changes with a heavier RR, there would at least be an accompanying change in the angle of the RRU link (lower it) to reduce birdcage indexing? It seems like the majority of the faster cars around my area don't have too much angle in their RRU link.

[billetbirdcage]

^^^ LR 500? I believe Ince is selling his jig/s on Racingjunk.

I assume among other changes with a heavier RR, there would at least be an accompanying change in the angle of the RRU link (lower it) to reduce birdcage indexing? It seems like the majority of the faster cars around my area don't have too much angle in their RRU link.

I honestly can't remember if this was before or after the LR behind, seem like is was later then 98ish but my memory sucks any more, lol.

James sold out a long time ago and think it went thru several owners since then, so no idea on if the jig is remotely anything close to what James had at the time he was running it.

[RCJ]

Would the stiff r/r be used for a slick track or would it be used all the time?When we had a 10'' spoiler and 700hp motors I experimented with stiff r/r,It had some problems but would work.I came to the conclusion that there is more than one motion ratio for a spring mounting point.I'm not good enough at typing to explain that lol.We when a different direction but a bump stop set up might solve several problems.

[Stede Bonnet]

Short answer: No. You would be shocked the RR springs some guys are running. It is more of a momentum setup.

I know you've done a lot of work on Rayburns, but I'm curious if you ever tried any of this new stuff with bumps and what not with a swing arm car... You ever run a j-bar on a swing arm? If so, what length? I'm sure you've noticed I like swing arm cars. We always had good luck with the longer pullbar over the short one.

[MasterSbilt_Racer]

I know you've done a lot of work on Rayburns, but I'm curious if you ever tried any of this new stuff with bumps and what not with a swing arm car... You ever run a j-bar on a swing arm? If so, what length? I'm sure you've noticed I like swing arm cars. We always had good luck with the longer pullbar over the short one.

No bumps on a swingarm/swingarm. Have on a car with 4 link lr/swing arm RR. Have run j bar. Don't remember length. Actually preferred running it to the right side of chassis. Got rid of a lot of the "Rayburn fade" where they start skating on slick.

[King1]

I personally don't like the big rr split with the massive rr spring. Seems like its lazy on throttle on entry and it seems skatey coming off like it wants to jump up a lane or two. Although this year I did try a 125-500 progressive rate spring from swift and it was pretty darn nice JMO. But giving the big split and large rr spring a fair chance I probably did not adjust to make those changes really work I just stuck a 300 pound spring on with a 200 LR and let it go, again it felt skatey.

[sidewinder69]

so would a stack be good idea to get the proper compression and body roll then transition into the stiffer rate for better load?