Does anyone know the CG on LWB 911s?

[Haasman]

Curious- Is the approximate center of gravity the jack port area, +/- ? I am going to be trailering a car and have always been curious.

[redrobin911]

probably but the real issue is the ball hitch nose weight on your trailer - needs to be around 100 - 150lbs, many reverse the car on the trailer to do this. On my trailer I can load the car in forward or reverse just needs to be well up the trailer to get the nose weight right, on shorter trailers this may be an issue. If I reverse on the car can be in the middle. No matter what NEVER have negative nose weight or you'll have huge issues.

[Haasman]

Thanks redrobin911- Yes, I am familiar with tongue weight. I do always carefully make there is a positive load on the hitch ball.

I will be using a dual axel trailer and just wanted to visualize about where on the trailer bed the car would reside, +/-

Haasman

[Flieger]

Mine was 63.5% rear when I corner balanced it. That number was with 1/2 tank of fuel and no driver. (With me in it it was 62.5% rear)

That means the CG on my car is about 32.5" forward of the rear wheel. The torsion bar is about 18" forward of the rear axle line so I think the jack point is less than 14" from that but pretty close. Probably the jack point is a little rearwards of the CG.

My car is far from stock, however.

[Harvey Weidman]

I load mine with the jack point about 3-4 inches in front of the center line of the trailer axles.
Depending on the truck. The 1 ton more forward than the 1/2 ton.....I watch the change of the truck's height when loading.
HTH
H

[Haasman]

Great- Thanks these are all very helpful.

[sithot]

These setups are great. A buddy just pulled an Allard in a large enclosed trailer to Elkhart Lake WI for a reunion this past weekend. The trailer is a tandem and these took care of any issues regarding tongue weight and stability/sway.

http://www.etrailer.com/Weight-Distr...E9JhoCeOzw_wcB

[boxster03]

its really simple to figure out - just follow this formula

cg * W = S x dw
w = m * g
m = rho * V
w = g * rho * V
dw = g * rho * dV

dw = g * rho(x,y,z) * dx dy dz

then solve
cg * W = g * SSS x * rho(x,y,z) dx dy dz

[sithot]

My option works for load placement without finite element analysis and requires no calculator.
There is nothing worse than trailer sway except for trailer sway and no trailer brakes to "correct" it.

FWIW: Here is another outfit anybody considering towing a car safely should know about:

http://www.macscustomtiedowns.com/?g...JbnBoCT1Tw_wcB

My option works for a load without finite element analysis over where it's placed and requires no calculator.

There is nothing worse than trailer sway except for trailer sway and no trailer brakes to "correct" it.

FWIW: Here is another outfit anybody considering towing a car safely should know about:

http://www.macscustomtiedowns.com/?g...JbnBoCT1Tw_wcB

[sithot]

The stabilizer option works for load placement and requires no calculator.
There is nothing worse than trailer sway except for trailer sway and no trailer brakes to "correct" it. The terrible feeling of the tail wagging the dog.

FWIW: Here is another outfit anybody considering towing a car safely should know about:

http://www.macscustomtiedowns.com/?g...JbnBoCT1Tw_wcB

This is the real stuff.