soft lr spring

[cjsracing]

I have a similar problem when running a soft LR (125). The car is fast on the cushion and with traction (won a heat around the cushion), but when it slicks off the car goes to junk and 2 things typically happen:

1. Try to run low and the right rear doesn't dig and the car just slides up the track or
2. Try to run middle to high and I just shove the RF up the track.

Not sure how to fix #1 other than get off the 125.

For #2 I think I either have to much extended load (190 lbs) and I'm over powering the RF or I'm coil binding the RF (1600 lbs at 4" on a 300lbs spring) and the RF isn't digging.

The right rear is typically 170+ degrees when I come in from a 20 lap feature.

WRS2 tires, can't run bump stops or stacked springs.

[7uptruckracer]

If you think you are coil binding go to a barrel spring. What other changes are you making for the slick?

I have a similar problem when running a soft LR (125). The car is fast on the cushion and with traction (won a heat around the cushion), but when it slicks off the car goes to junk and 2 things typically happen:

1. Try to run low and the right rear doesn't dig and the car just slides up the track or
2. Try to run middle to high and I just shove the RF up the track.

Not sure how to fix #1 other than get off the 125.

For #2 I think I either have to much extended load (190 lbs) and I'm over powering the RF or I'm coil binding the RF (1600 lbs at 4" on a 300lbs spring) and the RF isn't digging.

The right rear is typically 170+ degrees when I come in from a 20 lap feature.

WRS2 tires, can't run bump stops or stacked springs.

[cjsracing]

If you think you are coil binding go to a barrel spring. What other changes are you making for the slick?

when it slicks off I usually make the following changes:

1. 3 to 4 turns out of the RF in order to help it get over on the RF (this puts the 4" number about 1600 on a 300 lbs. spring, I usually start the night with a 4" number of 1770ish).

2. Lower RRB 1 hole on the frame.

3. Lower Jbar 1/4" on pinion.

4. Slick track shock settings

[billetbirdcage]

I think you have a masters, which I have very little experience with so this may not be correct.

The few I messed with, didn't like high LR extended loads. If your at 190#, then once you drop LRL bar it's even higher. At that range they become inconstant and get tight across the middle but aren't tight enough to drive with some yaw in the car to get thru the throttle tight. It seems you fight a battle there, if you get in just right the car goes around the corner but get in a little straight or slow and it pushes, get in too crooked or hard and it skates. Again very little experience with masters and may just been a weird car.

Since your not allowed a stack or something to reduce or set the extended load number, you can either just try going up on LR rate some or just dial out some static rounds but will mess with other things doing that.

[cjsracing]

I think you have a masters, which I have very little experience with so this may not be correct.

The few I messed with, didn't like high LR extended loads. If your at 190#, then once you drop LRL bar it's even higher. At that range they become inconstant and get tight across the middle but aren't tight enough to drive with some yaw in the car to get thru the throttle tight. It seems you fight a battle there, if you get in just right the car goes around the corner but get in a little straight or slow and it pushes, get in too crooked or hard and it skates. Again very little experience with masters and may just been a weird car.

Since your not allowed a stack or something to reduce or set the extended load number, you can either just try going up on LR rate some or just dial out some static rounds but will mess with other things doing that.

That's pretty much exactly what it's doing and I do have a masters. I talked to someone yesterday and I think I am going to back the extended load off come feature/slick track time and see what happens. If that doesn't work I'll go back to the 175 lb LR spring and maybe get rid of the heavy birdcage.

I've got 3 planned races this weekend so hopefully I'll figure something out.

[Punisher88]

Can't you calculate your extended load by how much the spring is compressed?

[billetbirdcage]

Can't you calculate your extended load by how much the spring is compressed?

Yes, just measure springs compressed length on the car with rear end hanging. Then calc the rough pressure by subtracting that from the free hieght of the spring times the rate

Example: extended measurement of spring is 12.75" and it's a 14" spring so 1.25 x rate = extended load # or least a rough estimate.

[DK1]

Try taking the heavy cage off. I had a similar problem. Car was bad fast when track had any kind of moisture in it and then when it went slick you’d drop ancor. Took the heavy cage off and left everything the same and was instantly better.