No heat in RF tire?

[Egoracing]

In reference to going stiffer on the LR, Remember if you are transfering 600 lbs from right to left during cornering and you have a 200 lb spring the chassis is going to raise 3 inches just from weight transfer. If you are running a 150 lb spring the chassis is going to raise 4 inches from transfer. This added lift will also increase the centerline of the chassis which will increase leverage on the suspension AND cause more weight to transfer.

If you want to transfer more to the RF go to a softer spring which will allow the chassis to compress it more which will also allow the LR to extend some more. Just dont go so soft that it bottome out.

This is why so many late models are running a stacked LR, it allows them to get into the 100-150 lb LR spring, couple that to the 250-375 RF and they are going into and thru the corner on the RF while in the gas more.

[drtrkr244]

First, I would check out the GRT set'up guide. You're pretty far off spring wise.

Second, You are way off on rear stagger.If you have a 60" track width,on a 140' radius turn, the rear stagger should be in the 3 and 3/4 inch range for the feature.A lot of modified drivers make this mistake.The proper stagger for a late model would be in the 4 and 1/2 range with only a 6" wider track width.I know it can be difficult to get with IMCA tires, but get as much as you can.

Third, check your RR tire temp.It should be 5-10 degrees warmer. If the track has moisture, your tires wont even get warm.

[Dirtrunner35]

If I drive my car in just right , it doesn't roll over very much on the right front. Sounds to me your car is too tight in almost every corner, with a 16'' 150 lb spring, it would have alot of preloaded weight in the spring. Tire pressure, wheel offset ?

[drtrkr244]

If I drive my car in just right , it doesn't roll over very much on the right front. Sounds to me your car is too tight in almost every corner, with a 16'' 150 lb spring, it would have alot of preloaded weight in the spring. Tire pressure, wheel offset ?

AGREE.......His spring rates versus what GRT suggests, points to too tight.

[powerslide]

In reference to going stiffer on the LR, Remember if you are transfering 600 lbs from right to left during cornering and you have a 200 lb spring the chassis is going to raise 3 inches just from weight transfer. If you are running a 150 lb spring the chassis is going to raise 4 inches from transfer. This added lift will also increase the centerline of the chassis which will increase leverage on the suspension AND cause more weight to transfer.

If you want to transfer more to the RF go to a softer spring which will allow the chassis to compress it more which will also allow the LR to extend some more. Just dont go so soft that it bottome out.

This is why so many late models are running a stacked LR, it allows them to get into the 100-150 lb LR spring, couple that to the 250-375 RF and they are going into and thru the corner on the RF while in the gas more.

I think what you are saying is the softer spring has more overall drive correct? Especially if you can keep it somewhat on the bars. But i am saying from the point where its laying flat where you are initially picking up the gas it will have more go forward(i know technical term) at this point. That was my understanding from what the great guru told me.

[dirttrackrocker]

In reference to going stiffer on the LR, Remember if you are transfering 600 lbs from right to left during cornering and you have a 200 lb spring the chassis is going to raise 3 inches just from weight transfer. If you are running a 150 lb spring the chassis is going to raise 4 inches from transfer. This added lift will also increase the centerline of the chassis which will increase leverage on the suspension AND cause more weight to transfer.

If you want to transfer more to the RF go to a softer spring which will allow the chassis to compress it more which will also allow the LR to extend some more. Just dont go so soft that it bottome out.

This is why so many late models are running a stacked LR, it allows them to get into the 100-150 lb LR spring, couple that to the 250-375 RF and they are going into and thru the corner on the RF while in the gas more.

This is making sense to me... I'm gonna give it a try. My problem has been the same as the OP. No heat in RF. I watch the video and all the other cars are doing like you said, riding on the RF like the late models. My car lays over on the RR and the minute I hit a bump or the cushion with the RR it shoves the nose. I softened the RF and stiffened the RR and left the LR alone and cranked more preload into it. I'll see how it works Friday.

[drtrkr244]

You're shoving the nose because :

1.too much load on RF(increased dynamic wedge)

2.too much LR spring(increased dynamic wedge)

3.wrong shock package.

To copy attitude of lm's you need:

1.RF-high rebound
2,Lr-high compression
3RR-med. rebound

[dirttrackrocker]

Thats what I have for a shock package now.

[drtrkr244]

What brand of tire and compound?

[dirttrackrocker]

Hoosier G60 I run IMCA

[drtrkr244]

I believe that is a very hard tire.To get a hard tire up to working temp, it has to have weight put on it.

I would mount a 10-20lb piece of lead right behind upper RF shock.I would also move dynamic roll center to right with longer ball joints starting with upper first.

One of the "mysteries" of reading dirt tires is deciding whether it needs more or less weight put on it.

No doubt, tire prep would help if its "legal" at your track. Diagonal grooves and sipes would help also.

[dirttrackrocker]

Yeah we can sipe and grind, but no grooving. I have the longer Ball joints in. I put a softer spring in the RF and changed the ride heights around a little. I'll see how it works friday.

[Dirtrunner35]

This is making sense to me... I'm gonna give it a try. My problem has been the same as the OP. No heat in RF. I watch the video and all the other cars are doing like you said, riding on the RF like the late models. My car lays over on the RR and the minute I hit a bump or the cushion with the RR it shoves the nose. I softened the RF and stiffened the RR and left the LR alone and cranked more preload into it. I'll see how it works Friday.

A softer right front spring will not put more heat in it , when you hit a bump or the cushion hit the gas if not the front will come around on you. A softer right front will make the front bite more with the left front, so the car will have more bite in the front and not the rear, making it not so tight ( push ).

What are your tire pressures?? What is your shock compression on right front and rebound on left rear ? Compression on left front and rebound ? Pull the rr back at little to free it up .

[dirttrackrocker]

The whole front end just seemed like it had no grip. Shocks are 2-7 RF 6-3 LF 4-4 RR Traction shock on LR

[Dirtrunner35]

Is this a spring behind car? Does the front have less grip because the rear has more ?????? Meaning to tight of a car ?? A push or tight car is because the rear has more bite then the front.