Its a race car so junking doors is no issue.
Full 6 point cage and a **** load of aero are the killers of my car. Without the cage and aero car would be in the 2700 pound range.

The 2998 is without me with 3/4 of E-85. 3153 with me in there.

 

x2 !!!

 

Ill weigh them sometime.

 

sexy car! love the roof

 

After I made my post & kinda figured that weight was without you considering all the added weight you have with aero & the cage. Either way nice job man, I am sure at this point you are getting limited on the weight reduction things you can/want to do...

 

^ When I tell people what the car weighs I think they forget it has a full roll cage, fire bottle etc. That crap adds up super quick. I would love to see the car 29xx with me in it. One can dream right?

 

Still seems kinda heavy for what all you've removed. Did you use mild steel or chromoly for the cage?

 

Yeah, I've seen it first hand by making over 800 WHP on an EBAY IC. Worked fine on the dyno, was complete junk on the track though.

I am using a Garrett core that is rated to 550HP and only have hopes of 450WHP. Sometimes the "one size fits all" solution might not be the best for that particular setup. The Garrett core you use though is definitely a great core and works even at the 1000 WHP level, as I'm sure you know.

Kidloco51, car looks great. Sweet roof decal.

Wheatley, I didn't think you could use thin wall chromoly for the cage on a road race car?

 

1 3/4 .120 DOM steel

 

whitegsr, Im not sure of the rules for the sanctioning body hes racing in. If it were allowed I would run it in a heart beat for the weight savings. Obviously now it's not cost effective to cut out an existing cage and replace with lighter chromoly even if it were allowed.

kidloco, that explains a good amount of the additional weight. Car looks awesome btw.

 

Cost/weight savings to run chromoly wasn't worth it to me. 1 3/4 chromoly, vs mild steel, for a 1 foot piece of pipe, is .1 lb a lb more per foot.

So, 60 feet of tubing, is 6 lbs.

 

I don't think that is correct. I have heard this from several local cage builders about the weight savings pf CM over MS. From what I have heard its closer to .75lb per foot in your case it would be a savings of roughly 45lbs. I feel 45lbs is a fairly decent amount especially since some of that is up high in the car with a roll cage and will effect your center of gravity. I'm not a mathematician but this is taken from a mopar board and will shed some light on the weight differences since you can use a thinner wall thickness with CM over MS due to its strength characteristics. Now this is 1 5/8 which will be lighter per foot over you 1 3/4 but will give you an idea, I really don't think as many people that use CM over MS would do it for .1lb per foot savings given the cost difference between the two.

quoted from http://www.forabodiesonly.com/mopar/....php?p=1534104

I went out the the garage and pulled the tarp back on my 1967 Plymouth Valiant that is currently playing the role of my spare shelf holding up old clothes, empty boxes, etc. I roughly measured out the tubing that would be needed to make a 12 point cage in the car. I figure I would need about 740" of tubing.

I am going to abbreviate some of these down.

A1= Area of tubing using the outside diameter (OD) of the tubing.

A2=Area of tubing using the inside Diameter (ID) of the tubing.

AT =Area of total profile of tubing.

PI = 3.1416. PI is a mathematical constant whose value is the ratio of any circle's circumference to its diameter

R = Radius of a circle

Density of Mild Steel = .2833 lbs./in³

Density of Chromoly = .2833 lbs./in³

V = Volume

W= Weight

MILD STEEL ROLL CAGE TUBING

Roll cage tubing in MS is 1.625" in diameter, and has a wall thickness of .134".

OD = 1.625"

ID = 1.625-(2*.134")
= 1.357"

1. A1 = PI*R²
=(3.1416)(1.625/2)²
=(3.1416)(.8125)²
=(3.1416)(.660015625)
= 2.074in²

2. A2 = PI*R²
=(3.1416)(1.357/2)²
=(3.1416)(.6785)²
=(3.1416)(0.46036225)
= 1.446in²

3. AT =A1-A2
=2.074-1.446
= .628in²

4. V = AT * Length of tubing.
= .628in² * 1.00in
= .628in³

5. W = V * Density
= (.628in³)(.2833lbs./in³)
= .178lbs.

So, the weight of Mild Steel Roll Cage tubing is .178lbs. for every inch of tubing.

CHROMOLY ROLL CAGE TUBING

Roll cage tubing in chromo is 1.625" in diameter, and has a wall thickness of .083".

OD = 1.625"

ID = 1.625-(2*.083")
= 1.459"

1. A1 = PI*R²
=(3.1416)(1.625/2)²
=(3.1416)(.8125)²
=(3.1416)(.660015625)
=2.074in²

2. A2 = PI*R²
=(3.1416)(1.459/2)²
=(3.1416)(.7295)²
=(3.1416)(0.5321705)
=1.672in²

3. AT =A1-A2
=2.074-1.672
=.402in²

4. V = AT * Length of tubing.
= .402in² * 1.00in
= .402in³

5. W = V * Density
= (.402in³)(.2833lbs./in³)
= .114lbs.

So, the weight of Chromoly Roll Cage tubing is .114lbs. for every inch of tubing.

THIS WORKS OUT TO A 36% WEIGHT SAVINGS

SO, now that we know the weight per inch, how much is the weight difference between a MS roll cage, and a Chromoly Roll cage in the same car?

Let's Assume we will be using 740" of tubing in this example, based off of my Valiant.

Total weight using a mild steel cage = 740" * .178lbs.
This gives us 132lbs.

Total Weight using a Chromoly cage = 740" * .114lbs.

This gives us 84lbs.

 

^^^ um. what did he just say??

thats some math right there boy.

 

Its above me that's for sure. I had heard it in the past from people that know more than me but wanted to show what I was talking about. I'm not trying to take anything away from kidloco's car but every ounce adds up.

My car was 2860 with sunroof, power windows, power locks, stock front and rear seats, heat all other stock options except ac still intact. That was a half tank and 60 lbs worth tools, laptop, and other misc junk that's always in the car on the street.

 

For reference, the weight saved between DOM tubing and moly is the difference in legality of the wall thickness.