Where is it legal to add ballast?
 

I am changing classes and need to add 100lb (ug). I will use 2, 1/2" bolts with welded nuts per the rules,

Is it legal
-to add ballast in the passenger compartment?
-to add ballast under the car?
-to add ballast in the trunk?

thanks in advance, Ray

Re: Where is it legal to add ballast?
 

All are legal, provided proper mounting. Try over top of rear as first choice.

Re: Where is it legal to add ballast?
 

Top of the rear will affect the dynamics of the suspension. Start adding weight a few inches in front of the rear end pinion.

Re: Where is it legal to add ballast?
 

Look in class rules and general regulations in the rule book on how to add weight safely. All so talk to tech and ask if there are places where adding weight is not allowed.

Re: Where is it legal to add ballast?
 

Would it be legal to add it to the rear axle housing vs inside the car?

Re: Where is it legal to add ballast?
 

Guess you could make the axle tubes out of thicker material.

Re: Where is it legal to add ballast?
 

No Prep car bolt weight to axle to not upset sprung weight.

Re: Where is it legal to add ballast?
 

Try and minimize unsprung weight, keep the weight up in the body . I think the rules say that added weight can't be higher than the wheel wells . Adding weight to the axle will slow the axle reaction down , the lighter the better !

Re: Where is it legal to add ballast?
 

General Regulations Section 21, page 19
General Regulations
Requirements) is permitted. Removable weight must be securely
mounted to the frame or frame structure by a minimum of two
1/2-inch-diameter steel bolts per 100 pounds, or one 3/8-inch
steel bolt per 5 pounds; all other weight bars, pucks, etc. must
use minimum 1/2-inch-diameter SAE grade 8 bolts for attachment.
Hose clamps, wire, strapping, tape, tie wraps, etc. for securing
weight or ballast prohibited. Acceptable forms of ballast are 1)
Heavier gauge steel floors (i.e., 16- or 18-gauge, heavier gauge
and/or plate steel prohibited); 2) Frame reinforcing cross members;
or 3) the addition of protective equipment such as roll bars,
flywheel shield, etc. If additional ballast is needed and is permitted
by Class Requirements, it must be permanently attached to frame,
bolted with two 1/2-inch-diameter bolts per 100 pounds, with nuts
welded to bolts. Maximum amount of removable and/or permanent
ballast, unless otherwise stated under Class Requirements, is 500
pounds. Cars running 8.49 and quicker are limited to 250 pounds
maximum, per SFI chassis specification.

Re: Where is it legal to add ballast?
 

My suggestion would be if you have access to 4 corner scales see which corner of the car needs the weight.