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]

It doesn't take an engineering degree to see where the points of load are on a 914......hint....there are 4 and round black things right near em'.
Once that tough bit is over, then you gotta figure out where you can attach structure & how to bridge between them.

As Brit wrote, a butt dyno reveals a huge difference. The chassis moves more like a single unit and the suspension does it's work in a more controlled manner.
This causes the car do the same thing every time when loaded....or close enuff. (IMG:style_emoticons/default/biggrin.gif)

BTW, there is closer to 60 lbs than 20 lbs extra. Bridges aren't light.

[Chris Hamilton]

It doesn't take an engineering degree to see where the points of load are on a 914

This is where I think we'll have to disagree. (IMG:style_emoticons/default/smile.gif)

The 'build it so it feels better' approach isn't scientific enough for my tastes. Just like people who dyno their engines after every change I'd like to see a quantifiable result.

My 914s and yours are built specifically for autocross. This means that we are not concerned with crash protection. Are the bars in your picture of the doors actually providing structural support or are you just adding weight with those? I think it takes more than an eyeball and a welder to determine that.