28m
06-07-2011, 12:06 PM
I bought a Jet (4 bar 4 bar) last year with three races left to go in the season. I won 1 out of the three and 2nd in the other and 3rd in a 8k to win after starting 24th with a provisional. Car was FAST. This is a Jet that a local guy updated to a 2010 rear 4 bar mounts. I re-clipped the rear of the car in the off season but did not change any pickup points of the suspension. I did change the under slung bars which happens to be how Jet centers the rearend. So I really don’t know for sure where the rearend should be aligned left to right.
I started the season with the tires inside each fender. I went out and the cars was tight tight tight. Made spring changes, add RR trail, raised Jbar on pinion and shocks to loosen it…it got tighter. It reacted the exact opposite of what it should have. Before the main I pushed the rearend over to the right hoping to stop it from planting the RR. It got so tight I pulled off. Again, acted the exact opposite of what it should.
That week I used logic and moved the rearend back to the left (further than what I started with originally) so that all my bars where lined up correctly. The pull bar straight, the driveline straight and the bars towed in slightly in the front. Now the RR tires is inside the fender 3 inch and the LR sticks out about 3 inches. The rearend visible looks too far to the left…but all my bars are in line and the drive line is straight. The car is now LOOSE loose loose. No side bite AT ALL. Even entering the turn OFF the GAS, it skates and will not catch. I wait on it and wait and wait and finally when I pick of the gas, it is instantly loose. I peddle it til the car is straight then it rockets forward. Last week the track was so hooked up, they were turning laps faster than the track record. I had to drive the track like dryslick because I was so loose and NO SIDEBITE.
So in a normal world, the rearend too far to the left would make you think it would be tight getting in. It should plant that RR so hard the car sticks and drag the front end over. Matter of fact, it was loose in the heat last weekend so I…
Dropped the J-bar to the bottom hole on the pinion, softened the RR spring, softened the RF spring, put and 8-2 on the LR and a 3-5 on the RR. This thing should have rolled over so hard and pinned that RR but no…I GOT LOOSER. I know this MIGHT make the car looser on the gas but it was even skatier with no side bite off the gas. The changes had the opposite reaction.
This week I moved the rearend over to the right…like 3 inches. Again, I am lined up RR to RF tires, the tires are under the fenders on each side and the car looks back to normal. HOWEVER, my pull bar is pushed over to the right, my driveline is pushed over to the right and my bars point to the left in the front. Im not worried about the bars pointing to the left as again, this was a conversion to upgrade to a 2010 rear. It is likely the bars are not lined up for that reason. It does concern me that the driveline is not straight. When the LR is hiked up, the driveline is close to straight tho. ?????
IS IT EVEN POSSIBLE…that the rearend was too far the left and caused a loose condition with no side bite? It doesn’t make sense to me but is it possible???? Can you explain the theory if so?
Side note. EVRYTHING in the car…springs, bar angles, shocks, scale numbers, etc are the exact same as last year. The only thing that is not the same is the placement of the rearend. Also, each time I have moved the rearend, I have adjusted my scale numbers back to my baseline setup.
I started the season with the tires inside each fender. I went out and the cars was tight tight tight. Made spring changes, add RR trail, raised Jbar on pinion and shocks to loosen it…it got tighter. It reacted the exact opposite of what it should have. Before the main I pushed the rearend over to the right hoping to stop it from planting the RR. It got so tight I pulled off. Again, acted the exact opposite of what it should.
That week I used logic and moved the rearend back to the left (further than what I started with originally) so that all my bars where lined up correctly. The pull bar straight, the driveline straight and the bars towed in slightly in the front. Now the RR tires is inside the fender 3 inch and the LR sticks out about 3 inches. The rearend visible looks too far to the left…but all my bars are in line and the drive line is straight. The car is now LOOSE loose loose. No side bite AT ALL. Even entering the turn OFF the GAS, it skates and will not catch. I wait on it and wait and wait and finally when I pick of the gas, it is instantly loose. I peddle it til the car is straight then it rockets forward. Last week the track was so hooked up, they were turning laps faster than the track record. I had to drive the track like dryslick because I was so loose and NO SIDEBITE.
So in a normal world, the rearend too far to the left would make you think it would be tight getting in. It should plant that RR so hard the car sticks and drag the front end over. Matter of fact, it was loose in the heat last weekend so I…
Dropped the J-bar to the bottom hole on the pinion, softened the RR spring, softened the RF spring, put and 8-2 on the LR and a 3-5 on the RR. This thing should have rolled over so hard and pinned that RR but no…I GOT LOOSER. I know this MIGHT make the car looser on the gas but it was even skatier with no side bite off the gas. The changes had the opposite reaction.
This week I moved the rearend over to the right…like 3 inches. Again, I am lined up RR to RF tires, the tires are under the fenders on each side and the car looks back to normal. HOWEVER, my pull bar is pushed over to the right, my driveline is pushed over to the right and my bars point to the left in the front. Im not worried about the bars pointing to the left as again, this was a conversion to upgrade to a 2010 rear. It is likely the bars are not lined up for that reason. It does concern me that the driveline is not straight. When the LR is hiked up, the driveline is close to straight tho. ?????
IS IT EVEN POSSIBLE…that the rearend was too far the left and caused a loose condition with no side bite? It doesn’t make sense to me but is it possible???? Can you explain the theory if so?
Side note. EVRYTHING in the car…springs, bar angles, shocks, scale numbers, etc are the exact same as last year. The only thing that is not the same is the placement of the rearend. Also, each time I have moved the rearend, I have adjusted my scale numbers back to my baseline setup.