VandykeT/A

I've only ran my car once since the 408 but with the stock bottom I had to leave near the limiter. Now I'm leaving in the 4000 range and the car tries to spin but doesn't feel as strong. On the street I run a 315 drag radial ( track Hoosier qtp) and I've noticed that with just me in the car or a small passenger the car spins like crazy at a 40-50 punch changing lanes etc. with a 250lb passenger the car actually holds the road really well. My question is do I need weight on the back of the car to do well at the track or do I need to be making suspension adjustments? It just amazing the extra 100lbs in the passenger helped with traction on the street.

scotty2000ss

iTrader: (2)

How much gas have you been racing with? Spare tire/jack removed?

VandykeT/A

Spare and jack are gone and approximately 1/4 tank. I've been going for Max weight reduction but it looks like I need it.

blk00ss

iTrader: (66)

What's your suspension setup?

VandykeT/A

Tubular front no front sway bar strange DAs in the front Arb in the rear with bilsteins and stock cut rear springs.

scotty2000ss

iTrader: (2)

I hear ya on that. I've been struggling with my 60ft. Best I've done is 1.9 on NT555R's. Just put some ET streets on and going back this friday. Maybe I'll bring my spare and jack for trial and error...

Bitemark46

Torque is a bitch. haha. So before your suspension was able to hold the lesser power of your stock bottom end. Sounds like you need some suspension tweaking. I wouldn't worry about on the street. I don't care how big of a tire with no prep it's gonna spin. I'd focus on what it does on the track.

Your bilsteins are they adjustable? Start them in the middle or maybe 1 click stiffer.

For the front start them at full loose or 1 click away on extension. For compression start in the middle or 1-2 clicks up from full stiff.

What is your tire pressure?
What is your front spring rate?
Have you ever plotted yoru suspenion? Your IC might be too far out and the rear is squatting on the hit.

-Mark

HioSSilver

iTrader: (8)

You running a iron block now? What's your set up?



last year I changed to a fab 9. Went to the track and the car felt like mush in that back. Came back with a rather unimpressive performance. Made some changes to tq arm and lowers and went back.....but this time with the jack/spare in it and 3/4 tank of gas and got a new best. Almost .3 better et vs 1st time out with the fab 9 and the car was about 100lb heavier. Fuel load can change them greatly.

VandykeT/A

I can't remember the spring rate it was what mwc recommended for the car. The front strange das are adjustable but the bilsteins on the rear are just stock replacement shocks from ws6store with stock springs cut one coil. All I've done is play with the shocks when I had the stock bottom until it stopped feeling like it wanted to wheelie and left it alone. Set pinion angle at I think -2 degrees. I haven't really adjusted anything on the suspension and honestly don't know much about it. And the set up is a 408 PRC247 251/259 cam FAST 102 6 speed and 430s. Made 523/487 with a couple issues my tune is giving me 12.0 afrs at wot and 10.0 occasionally driving around lol. It went 10.74 at 129 at 3000 feet. Best 1.59 at around a 4k launch.

Bitemark46

If I had to guess with non adj shocks I bet the rear is squatting. Stiffening up the shocks will help but with your power you should easily be in the mid to low 1.4's.

Go to Kevin Slaby's website www.baselinesuspensions.com . Then click on how to launch a drag car. It's gives a crash course on suspension geometry and how to plot your car.

Do you have any video's of your car launching. If not get a buddy to film your launch from the passenger side rear.

-Mark

ssvert99

iTrader: (26)

Torque arm car is completely different. It's not squatting. Get a real set of rear shocks and we will get it down the track!

Give us a call Justin we will get it handled.

VandykeT/A

Well the weight thing was a bust. I filled it up with gas and the stupid thing cut mid 1.8s. I went from 10.74 to 11.0 lol. It blew the tires off from a 4k launch. Eric I'll be calling you this week.