Yeah, I see what you mean. Looks to be even from front to rear. The car is pretty level with no load on the drivetrain. I was thinking it was just general body roll from engine torque? If that is the case, I was thinking of just adding a little more preload on the roll bar. I believe presently, I only have about a 1/4" of preload on the roll bar. What do you think? Add 1/4" more preload at a time to see what happens? The amount of roll that is happening now doesn't appear to be steering the car.
Discussion of Chassis Setup for 8 Sec. Assault
- Thread starter Alky V6
- Start date
I went ahead and added more preload to the roll bar. Added 1/4" of length to the right side link of the rear roll bar.
Measuring from the ground to the lip of the rear fender through the centerline of the wheel: 29 1/4" left, 29 3/4" right.
The wheelie bars still at 7 1/4" left, 6 3/4" right.
Measuring from the ground to the lip of the rear fender through the centerline of the wheel: 29 1/4" left, 29 3/4" right.
The wheelie bars still at 7 1/4" left, 6 3/4" right.
I hear ya.
As I was adjusting the link and checking it for the 1/4" change, I was thinking to myself, boy, this is taking a lot of turns to get this 1/4". Maybe I should just go for an eighth.
I'm going ahead with the 1/4". We'll see what happens.
I'll try to do that, Charlie.
Dusty Bradford
Well-Known Member
- Joined
- May 24, 2001
The body will have some roll just from the torque alone. If the car is driving straight I would not make an adjustment just due to looking at a picture. You want the car to launch straight without having to correct the steering.
If the car does want to move in one direction, 1/4" is WAAYY to much. If the car makes a noticeable move, 2 rounds of pre-load is plenty. I never measure the distance, I go by rounds on the adjuster.
This year a friend started logging shock travel. Even with a 25.2 chassis and the largest TRZ anti-roll bar, the car still has 1/2 more of shock travel on the left than it does the right. The chassis will have body roll......so adjust for driving characteristics, not because of what you see in a picture.
I have a crappy video of my car from Sat night. 1.30' 5.19 at 144.2. If I can find a way to get it from the camcorder to internet I'll post it. I had someone video the rear tire so I could watch seperation and wrinkle.
If the car does want to move in one direction, 1/4" is WAAYY to much. If the car makes a noticeable move, 2 rounds of pre-load is plenty. I never measure the distance, I go by rounds on the adjuster.
This year a friend started logging shock travel. Even with a 25.2 chassis and the largest TRZ anti-roll bar, the car still has 1/2 more of shock travel on the left than it does the right. The chassis will have body roll......so adjust for driving characteristics, not because of what you see in a picture.
I have a crappy video of my car from Sat night. 1.30' 5.19 at 144.2. If I can find a way to get it from the camcorder to internet I'll post it. I had someone video the rear tire so I could watch seperation and wrinkle.
That all makes perfect sense. I'll back the 1/4" out and go 2 rounds. Thanks, Dusty.
Haven't been to the track yet. I've finished with a staging control device for the transmission and I'm switching back to the 3.73:1 rear gearset in preparation of some 1/4 mile runs at Pinks next month. Next test and tune date is this Saturday at Barona.
Ran today. The car launched very straight. Pulled the wheels 6-8 inches. I still have to study the datalogs more carefully to figure out what the launch rpm and map was.
I have a time slip that shows a 1.09 60'. I didn't get a chance to back it up. A car rolled on the track and put an end to the day.
I have a time slip that shows a 1.09 60'. I didn't get a chance to back it up. A car rolled on the track and put an end to the day.
That pass was a 5.80 @ 122 mph. Nothing spectacular. I definitely see some room for improvement with the boost level up to and through the 1-2 shift. After the launch, it felt like the car cruised to and through the 1-2 shift, and then after the 1-2 shift things started happening.
I keep forgetting that most of your testing is done on the 1/8 mile Donnie. It may be a fluke but I want to see how you do next weekend. Hope you get the same 60' and make her even faster.
