wht97ws6ta

Went out to my local dragstrip Thursday night to see how the car would act since being tuned. Its a 355 with the 24x setup. Car made 423 rwhp @ 6700 and 368 ft lbs of torque at 5200 rpm. I've got 4.10 gears with a 3500 vigilante converter. First pass was the best and it was pitiful. Car initially hooked enough to get the front tires in the air around 4 inches then spun bad enough to shift to 2nd then back to low. Went a 7.71@91 mph and a 12.01@114.8 mph. Track conditions were horrible but I was really expecting more trap speed than it did. What's average for that power level and full weight car. Only thing done to the suspension is LCA relocation brackets. Tires are m/t drag radials. 275/40-17s with 19 psi

bowtienut

iTrader: (1)

I'm similar power/torque numbers to you, but peaks come in lower:
425 @ 6400, 386 @ 4600.
And definitely full weight...lol! 3800 lbs
Mine usually traps between 117 and 121, depending on the air.

wht97ws6ta

I got to get it on a decent track. Car was spinning bad. I think it was going to third less than 400 ft out and running third all the way out the big end. Still thought my 1/4 trap would have been better.

bowtienut

iTrader: (1)

Despite what people say about the launch not having much affect on trap speed, I have to disagree.
At lower power levels they're correct, but my mph is ALWAYS best on a dead hook.
You'll see an improvement when you hook it up and accelerate for an entire 1/4 mile rather than just 90% of it

LT14LIFE JT

iTrader: (1)

Try Piedmont or Fayetteville tracks for better results. Also, Roxboro just obtained new owners and management. I'm in southern VA and hit all 3 from time to time.

TravisMcGill2000

iTrader: (2)

What hole is your lca in?

wht97ws6ta

The bottom hole. The way the car hooked then spun seems alot like the lowest holes have got to much bite in the car and those short sidewalls and old factory shocks just cant handle it. Got to get it on a good track before i turn any wrenches though

TravisMcGill2000

iTrader: (2)

When I run mine at te bottem it hooks then spins. Mine hooks best at the highest hole.

bowtienut

iTrader: (1)

You're right about the "good track" being the dominant player.
However, it's worth experimenting with the settings at marginal tracks, since no matter where you end up, it will then ALWAYS hook up on a good track. I don't know your suspension geometry, but generally speaking, the more antisquat (ie. lower hole for the LCA's), the more demanding it will be on your rear shocks. Without double adjustables, the stiffer the better.
I don't hear very often of F-bodies having this issue; add 10" to your wheelbase and you'd REALLY have your work cut out for you! I've been to events where the Mustang and Camaro guys were happy with the starting line, when I thought it sucked!

wht97ws6ta

Do you mean the highest hole in the relo bracket or factory location?

wht97ws6ta

Yea I aim to get the car to hook on mediocre track conditions since that's typically what you get on test and tune nights. Thursday night when I ran it the track was far from typical. I just wanted to see how it did act on a decent track. I'm quite certain the way the car acted on the first pass (best starting line conditions) it is hitting the tires way to hard initially then unloading. It hit really hard and immediately spun so bad it went to 2nd way before 60ft and still did a 1.70 60 ft. Its got a lot left in it. Just got to get it sorted out.

bowtienut

iTrader: (1)

Yep, you have a LOT left.
From a dead hook to spinning the tires only 1 or 2 revolutions takes my 60' from mid 1.4's to high 1.5's

TravisMcGill2000

iTrader: (2)

In the relo brackets. Any lower mine do the same as is.

wht97ws6ta

Cool deal. Good info. Ill raise them up a hole and take another stab at it this Thursday night.

355z28

iTrader: (8)

When the cars on the ground the rear control arms should be level or "slightly" downward to the ground. Also check your pinion angle. I fought that hook and spin for a year before I made these adjustments.