What do you have for chassis stiffening? Options

[Justinp71]

I put some more horsepower in my car, so far I have just autocrossed it on street tires. I have the bolt in roll bar that has the mid bar going to the floor.

Besides that my chassis is stock and I am wondering what I should do for more re-enforcement... so I can comfortably run on slicks.

Below is a photo of the roll bar. I don't consider the roll bar to give to much chassis stiffening, but it just might help with cracking the longs.

Edit: I mainly just use the car for street and the occasional Autocross or DE

[J P Stein]

I've been building stuff for 40 odd years....most of it engineered by some damn good folks that I've had access to. I'm the curious type and have talked to those guys asking just why they do things as they do. No, not everyone has an "eyeball" but it can be developed over time. A good hand can make a bridge strong, but it takes an engineer to make it light.

You want to break things down to numbers...be my guest. Get/build your self a chassis rack (or rent one), drag out the load cells, strain gages, micrometers & jacks, get an engineer to interpret the data and design a cage to stiffen your 914. I would guess you'll end up with something very similar to what guys have been doing for 20 years.

You're right, those side bars are for chassis strength. The lower ones were one attempt to do the job from a few years back......but were inadequete. The upper bar tied into the front & rear shock towers is much more effective.....but not ideal because of the bend. The verticle bars twixt the side bars is an attempt to help the upper bar do what I wanted.
Again, a remodel.

The safety aspect pertains to them bunny ears on the top of the hoop. A higher roll bar would have been mo better....but the car had a lid back then and it wasn't required......remodel. (IMG:style_emoticons/default/biggrin.gif)