Trying to calculate E/T

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USMC1968

USMC1968

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Can anyone on here tell me round about what the stock weight is for a 68 cuda? I've been trying to find it, but no luck. I'm trying to calculate a estimated 1/4 mile time to ensure that I encorporate all the necessary safety features into the build. Thanks in advance.

Oh also, a couple of sites offer a seat saver roll cage. Is this considered a legal modification at most tracks?
 
You need to be more specific about the car in question, if you want an accurate answer.

Here are the SHIPPING WEIGHTS for '68 Barracudas from the Stanard Catalog of American cars, a reference book that's a pretty good source of info like this.

Street-ready, with gas, oil and water, plus undercoating and accessories will usually add about 250 pounds to shipping weights, so keep that in mind. Your car won't be anywhere near as light as these quoted weights.

1969 Plymouth Barracuda:
Notchback coupe /6: 2,715 V8 2,910
Fastback /6: 2,810 V8 3,005
Convertuble /6: 2,870 V8 3,070

A Formula "S" 340 car would be heavier than these weights, by probably 150-200 pounds because of the extra weight from the dual exhaust system, the 727 vs. 904 transmission (if it's an automatic) and the 8.75" rear axle assembly (vs. the 7.25")

Lots of variables... A/C and P/S can add over 100 pounds, easily...

So, you need to tell us EXACTLY what you have before we can venture a guess. Even then, you need to take it to a certified scale and weigh it so you'll know, for sure.

I'd try a guess, but I have no idea what body style it is, and you can see, looking at the shipping weights, how much difference that can make.

Try us again... with more info!
 
3300 pounds for a V/8 with some go fast goodies wouldn`t be too far off. Try driving the car to a recycler or landfill, they have scales that are pretty accurate.
 
Good point, I was pretty vague in the description. I think the reason is because the car isn't finished yet but I'll give you all the details I am sure of for now. Here goes nothing...........
It's a 68 Notchback, 440, 8 3/4, haven't decided about a/c yet but it will have power steering. Figure I can just use the old a/c method for a while 85 degrees x 10 mph cross wind x 55mph cruising speed :-D
Here's where the guesstimation gets a little tricky. I know you guys are gonna be angry, but the tranny is a TH400! Well the outside is, the guts are, as Campbell Enterprises put it "bulletproof up to about 1500HP" (We'll see). The engine is in it's finishing stages at CNC motor sports. Now a 514ci with the Dyer's 8-71 setup. Couldn't find the weight for this setup on their website, I'll have to call them. I told Jason at CNC Motor Sports that I wanted 1000HP out of it, with room to build in the future if need be. I am going to be purchasing the RMS Alterktion coil over system which has a weight of approx. 132lbs. Still trying to get the difference between that and stock. Street Lynx rear end kit. As far as tires go, still not sure how tall and wide a tire I'm gonna have to run to hook up.(Any feedback on that issue would be greatly appreciated) This is my largest build I've ever done by about 400HP so I'm taking it a step at a time to ensure everything will be as sturdy and safe as possible. Been about 8 years since I've done any strip racing. Pretty much when I joined the Corps is when it ended, but I do miss the hell out of it! So I'm slowly gonna creep my way back into it and try not to kill myself in the process. Any inputs you guys have out there, I would love to hear them. Any suggestions or changes as well. I've learned you can never know it all so I have a very opened mind when it comes to veteran racers. Hope this info helps a little. Any other questions, I'll be more than happy to answer to the best of my knowledge.
 
The formula for ET is the cube root of weight/hp x 5.825. I got this from my bible, the Auto Math Handbook.

You need to have an real number for the horsepower at the wheels (not flywheel HP) and actual weight with driver for it to work properly. If not, it's just guessing. I assume at least 15-20% loss of power through the driveline, probably more in reality unless everything is rollerized and super lightweight and your gear and tires are correct for your goals.

Just for fun, let's assume your car will make around 850 to the wheels and it will weigh around 3,500 with all the equipment you need to go fast safely.

I come up with a 9.3 ET. Sounds conservative with 1,000 hp on tap, but obviously if you were lighter you'd be faster. This number is assuming everything about your combo/chassis/converter is optimized.

See these two pages for more calculators such as optimum gearing and tire sizes.

http://www.wallaceracing.com/Calculators.htm

http://www.tciauto.com/Products/TechInfo/Calculators.asp#8
 
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