As I start preparing the car for CR next year I know that I am going to have to add balkast to the front passenger compartment. I am going to try and get the car weighed next week to see how much I will need but am anticipating about 200-250lbs My original thought was to weld together a brace and bolt it down to the original seat bolts. My question is, is this safe enough and will they hold the weight? (they hold a seat plus occupant?)

My thought was something like this (do not flame my to scale CAD design) with the four corners being where the OEM seat bolts go to the frame. I expect it would nered to be bigger but you get the idea. I was also thinking to use marince weight.

Can you show me pics of what you have done please

 

You know you have to retain the passenger seat for all stock classes, yes?

 

Use two 3/8" or 1/2" bolts to hold a 30-40 lb block of ballast. I wouldn't mount 200-250 lbs of balast to those four little bolts. I'm assuming you are ditching the seat.

Also keep in mind that 200-250 lbs takes up a good amount of space. My 30 lb lead blocks are about 6"x12"x1" and the passenger footwell (floorpan forward of the passenger seat) can hold about 3, maybe 4 of them....which means in a 911 you would need the passenger footwell, behind the passenger seat and behind the driver seat to get 7-8 blocks in the car. Does the 944 have much more space?

 

yeh, but I am thinking about NASA supercup where you can remove interior, or SP3. My car just is not going to get into F class as it has gone too far prior to me owning it,. Would probably be cheaper to buy a new car rather than convert back.

If people retain there seat where do they put it? and how

 

I am only guessig at weight needed at moment, but trying to get some ideas in advance

 

if you go with individual blocks/weights, bolt them in individually. it let's you fine tune the weight and should one come loose in a severe shut then you minimize the amount of ballast moving around the driver's compartment. Having 200+ lbs flying around would be really bad.

My point was not specific to 200+ lbs. Even at 100-150 you need a fair amount of space.

I mount mine to the footwell as described above and have a little behind the passenger seat too.

 

You would need a 12x48x1 inch piece of lead to get 240 lbs. That is one large piece of lead.
http://www.alchemycastings.com/lead-...heet-sizes.htm

 

not to mention expensive. I think my lead blocks were around $30-$35 a piece.

 

Dan
You need lead. I have 120lbs in my car under my passenger seat. Drop by my house next week and I'll show you the setup I have. You need to fab up a box.
Sean

 

Make sure the lead ballast is placed in places without compromising the corner weight and balancing of the car. My car had the ballast placed in less than ideal spots by the previous owner and I needed to correct this when dialing the suspension in. There a bunch of shops that can handle this for you.

Good luck.

 

PIctures?

 

sorry but I don't have pics of the ballast installed. Imagine the blocks sized as i said above laying flat on the passenger floor with two 3/8" or 1/2" bolts bolting each one to the floor.

the ballast I have behind the passenger seat is actually the mount for my 5L AFFF fire system. I overbuilt it so the whole fire sytem is ballast.

 

Passenger seat not needed for 944 cup/Supercup - interior is free.

If your car still has all the street equipment in it, doubt you'll need more than 100 lbs max to make Turbo S weight (if your car is a Turbo S) If you're running to Turbo weight - you won't need any ballast whatsoever - you'll be over.

 

Car has had interior removed includiong door panels, motors, speakers, center console and ac delete.(see pic below) Added back in a cage, fire bottle so guessing I will be around 3000. I will weigh 170 with a helmet etc and I need to get to 3350 for turbo S but prepared. So guessing about 180 lbs needed

 

I went to a local machine shop and bought different thickness sheets of steel and had them drill two big holes for big bolts. They are about 12X18 inches. The plates range in weight from 10 to 30 lbs. I use huge bolts and a backing plate I insert from under the car. I use a rubber grommet washers and a nut on top. Don't do what I did and run the bolt down and have it hanging down under the car. I high-sided on a curb and hit the tire wall because of that bright move. I think I bought 140 lbs to drop to GTS4 in PCA.