Where to go to measure stopping distance??

[chicane]

Originally Posted by nitrorocket

I will have to make a goal! 0-100 and back to 0 in 10 seconds should be a reasonable goal?? Dang snow!!

I dont know about reasonable with your current component selection. My guesstimation, you'll be lucky to actually see 11.5-12.5ish seconds.... unless you have the ability to play with the anti-dive and anti squat of your chassis (of both front and rear), at your current ride height. Well... that and pull near 750+ pounds out of that chassis.

Bias adjustments alone wont yield numbers, but excellent tire selection will definately help to get you closer to obtaining your goal.

With your chassis weight, ride height, wheel and tire... and current brake system, a realistic goal for 0-60 would be around 112-116 ft with it dialed in. Getting to 100 is the easy part, but stopping it from there on the same suspension is something completely different.

[nitrorocket]

How long does it typically take to stop from 100-0 or 60-0 in seconds?? Who on here does 0-100-0 in ten or eleven seconds, what is your combo?

If I can get to 100 mph in maybe 5.5-6 seconds, that would leave 4-4.5 seconds to stop to 0 mph. That sounds like enough time to stop, but I cannot find anything to campare actual stopping TIME from 100 mph on other cars.

[Damn True]

http://www.ultimasports.co.uk/records/poster2lr.pdf

[chicane]

Well, lets look at some known numbers as tested for 0-100-0:

Time vs. weight
Ultima GTR 9.4 @ 2300lbs
Ferrari Enzo 10.9 @ 3009lbs
McLaren F1 LM 11.5 @ 2513lbs
Porsche Carrera GT 11.6 @ 3042LBS
Pagani Zonda 11.8 @ 2089lbs
Porsche 911 Ruf R Turbo 13.1 @ 3287lbs
Ferrari F40 13.8 @ 2315lbs
Lamborghini Murcielago 13.9 @ 3671lbs
Dodge Viper SRT-10 14.6 @ 3385lbs
Aston Martin DB9 14.9 @ unpublished; speculated 3142lbs
Honda NSX Type-R 16.2 @ 2180lbs

Most, if not all of the noted chassis have a lesser chassis weight, lower CG, refined suspension geometry and much, much more braking capability than your Olds.

As tested 100-0 times in seconds for the same:

Ultima GTR / 3.6secs
Bugatti Veyron / 4.2secs
Ferrari Enzo / 4.0secs
McLaren F1 LM / 4.6secs
Porsche Carrera GT / 4.1secs
Pagani Zonda / 4.0secs
Porsche 911 Ruf R Turbo / 4.2secs
Ferrari F40 / 4.7secs
Lamborghini Murcielago / 4.4secs
Dodge Viper SRT-10 / 4.7secs
Aston Martin DB9 / 4.4secs
Honda NSX Type-R / 4.4secs

Your Olds is in the same ball park for weight as the underlined Viper GTS. Yeah, you got it on acceleration, but deceleration goes to the Viper... so its a probable wash. Thats is why I gave you the 12.5 second goal frame.

Another example from tested values:

Car / 100-0 / 150-0 / chassis weight
Acura NSX / 341 / 742 / 3016
BMW 540i Sport / 321 / 796 / 3740
Dodge Viper GTS / 377 / 907 / 3420
Jaguar XJR / 460 / 802 / 4006
Porsche 996 Carrera / 310 / 751 / 3116

Maximum decleration on average, for a DOT street leagal tire is right about -1.3G. 100mph is 146.7 feet per second. 146.7fps at -1.3G... do the math. But what really needs to be paid attention to is the 150-0 numbers. That is what really tells you whats going on when looking at 100-0.

FWIW, I dont have the 67 completed. Nor have I completed a 0-100-0 test, at this standing. But, a very similar chassis with the same components loaded , does an as tested 60-0 in 89 feet and is about 200lbs heavier than my own 67 which is @ 2800lbs. All I know is, that's faster than any production car ever constructed.

[nitrorocket]

Its a Chevelle, not an Olds!

Is there something I am missing here? I am not sure what time is all added into these figures or how exactly they are done.
Let's say my car does 0-100 mph in 5-5.5 seconds, If I picked the slowest stopping distance of lets say 5-5.5 seconds from 100 mph, that would give me somewhere in the 10-11 second 0-100-0 range, correct??

According to that list, the Viper goes 0-100 in 9.9 seconds? Is that right? That is extremely slow.

I need to get the car out in spring to try my new rear suspension geometry to see if I can get off the line faster. If I can get to 5 seconds flat or better seconds for 0-100 that will help out my braking by allowing more time. I am hoping the super sticky massive rear tires will help my braking a little by allowing quite a bit more bias to the rear.

I have C5 brakes all around with 255/40/17 BFG Gforce up front, and 315/35/17 Goodyear GSCS road race slicks in the rear. For Spring I am
swapping front and rear springs to the Eiback Pro kit, and will have Bilstein sport shocks all around.(After Christmas is over I am going to pick them up.)

There is no true way to find out what it will do untill I actually get to try with my car. Does my standard G-tech do this? I assume I will have to do 0-100 and 100-0 seperately and add the times together??

[sik68]

Just a guess, but to get a "true" reading, you can't add your 0-100 and your 100-0 times together, because there is a transitional period where the suspension has to "resettle," shifting the weight from the rear to the front of the car. I would think this takes quite some time, especially with a relatively soft-sprung car. Just using my imagination, this process alone could take well over 1 second; during this time hardly any deceleration would be taking place.

[nitrorocket]

Hmmm.

[Derek69SS]

...just some thoughts, but if the goal is simply 0-100-0, and there's no "handling" involved there's a few things you might want to try to shorten your time/distance, but would also severely mess up the handling.

You would want relatively soft front springs for accelleration, but pretty firm for braking... you could combat this by adding anti-dive into the front geometry (involves relocating your UCA mounts) or if you're not willing to do that, 90/10 drag shocks would help to allow the front to rise, but slow down the dive when braking. Also, set the alignment to a slight +camber so that when the front does dive, the tires stay flat on the road's surface, making an even footprint all across the tread width.

Of course, this will make it handle like crap, but if you're looking for impressive 0-100-0 numbers, it may be something to think about.

[nitrorocket]

I was hoping it might be possible with what I have and some brake bias and tire pressure tuning. I do have 90/10 drag shocks. It would be prettu neat tp pull it off. That is pretty darn quick to be able to go 0-100-0. If you sit and think about it, that is crazy fast. Most production auto's cannot do 0-100 in 10 seconds let alone add stopping into the mix.

Any body with a good sticky tire C5 brake ever test stopping distance/ and or time with there car? Should I assume I can get the car to stop at least as good as a C5 Vette? I weight a tad more, I am at about 3550 lbs without driver, but I don't have factory pads or tires. I would that that should be easily possible. I Just then have to find out how fast a C5 accelerates/stops in 0-100-0. If I can do that, I can get a better ball park by just subtracting seconds for it's slow 0-100 time.

Is this called bench stopping instead of bench racing? I need something to give me a goal and hold me over untill spring.

Anybody have super stiff front or rear springs they want to get rid of, Or should I stick with the Eibach's?

[Jr]

Motor Trend just did a good write up about the CTS-v VS the CTS-vR
Page 92
Braking, 60-0
cts-v: 124ft
cts-vR: 96ft

All of these cars have had countless hours of engineering

Another test
shelbygt500 and corvette z06
Page 53
Braking, 100-0
shelby: 321ft
corvetee: 320ft

braking, 60-0
shelby: 112ft
corvette: 108ft