What 60' to expect?

[Jerryl]

What 60' should one expect with the following;

UMI lowers / ATR style sway bar / stock posi rear
Stock Uppers
255/50/16 MT DR
5-7 PSI launch
Gbodyparts tubular uppers front with stock swaybar
I “think” the car was lowered about 1”
Let assume a horrible track prep.

Just looking for a rough idea . . .

 

[forcefed3.8's]

What should the car run? A 12 sec car can get into the 1.5's with less than that on a prepped track. On a crappy track, with 5 to 7 psi, 1.6 to 3.0. Got to feel what the track likes. I could get (high) 1.7's in a high 11 sec car off idle with 225/60 Cooper Cobras. The car ran mid 12's then.
A car I put together for a friend on the only time out in 95deg heat went 11.36@119 with a 1.7X 60' on 22psi. 255/60 MT DR, stock longblock, TE60, THDP, 009's, small Cotton's front mount, Vigilante 0 pump unlocked. He had umi uppers and lowers, stock swaybar, and 1 air bag.

 

[charlief1]

First thing first Jerryl, scale the car and check ride height. If the car sits lower in the front it won't transfer weight as well as stock height so the 60' will suffer some unless you're running some super sticky tires.

 

[Jerryl]

. . . . On a crappy track, with 5 to 7 psi, 1.6 to 3.0. Got to feel what the track likes. . . . ..

Thanks for the reply!

Charlie,
What is the best way to tell if it will transfer the weight? IC Calculation?

 

[coach]

I've seen Barry Wood...aka TryMeGT, run 1.5's and 1.6's on almost any track he goes to. He runs high 11's consistantly and has been as low as 11.3. He runs boxed factory arms and stock swaybar and old gas shocks. No front swaybar. He launches at 3500 rpm's. He doesnt go by a boost level. His new set-up is giving him fits, but he has made over 1000 passes with old set-up and run those numbers. Tires are MT ET 275's

 

[charlief1]

Charlie,
What is the best way to tell if it will transfer the weight? IC Calculation?

IC calc is a great way to get an idea for a start but you really need to see where the weight sits. Starts with the weight and chasis height first then plot the IC as it sits. You can play with the IC location on the calculator as well as chasis heights before you change anything. Also consider the type of front shocks as Donnie pointed out. A 90/10 shock will help transfer weight but if you can't get the front up then it won't do a whole lot for ya.

 

[coach]

IC calc is a great way to get an idea for a start but you really need to see where the weight sits. Starts with the weight and chasis height first then plot the IC as it sits. You can play with the IC location on the calculator as well as chasis heights before you change anything. Also consider the type of front shocks as Donnie pointed out. A 90/10 shock will help transfer weight but if you can't get the front up then it won't do a whole lot for ya.

Hey Charlie...nobody knows who "Donnie" is...you do, but they know Coach

 

[charlief1]

Hey Charlie...nobody knows who "Donnie" is...you do, but they know Coach

Sorry. Once I know someoens name I prefer to use it.

 

[coach]

Sorry. Once I know someoens name I prefer to use it.

Im just jerkin' your chain. But for real, even people in my own town dont know me as Donnie. I've been Coach for way too long.

 

[forcefed3.8's]

A 90/10 shock can go to full extension too soon. Remember these cars are lifting a 6cyl not a BBC. Also, leaving with too low of boost will make the car launch on the converter rpm, come up, come back down, and then come back up again when boost hits. For 10 sec and slower, stock cheapo style shocks work the best. Hell, I know of a low 9 sec car that still runs the original shocks, and gets 1.3 60's.
IMO, people do too much work to make these cars leave, and mess everything up. Getting into the mid 1.4's takes little work, and barely any $ in parts, and practice.

 

[Nick Micale]

What 60' should one expect with the following;

UMI lowers / ATR style sway bar / stock posi rear
Stock Uppers
255/50/16 MT DR
5-7 PSI launch
Gbodyparts tubular uppers front with stock swaybar
I “think” the car was lowered about 1”
Let assume a horrible track prep.

Just looking for a rough idea . . .

With all the items you listed, a few negative ones like the car lowered, and a horrible track, my guess would be a 1.9?


Calculations will get you a "number", but the real world will be the only way to find out what it will actually do. Your basic suspension build is not "track friendly".

Charlie's comments will put you on the right track, and I fully agree with "forcefed3.8's" comments as well, especially the last sentence!

 

[Jerryl]

Thanks for the feedback guys.
So . . . . where do you measure to determine of the car is lowered and what is the measurement I am looking for?

 

[charlief1]

Ride height is measured behind the front wheels and in front of the rear wheels at the rocker pannels. If I remember right you've already replaced the body bushings, right?