The FAB53 '72 Nova

[Nessumsar]

I have finally taken on an actual project on my Nova, so I guess its fitting to start a project thread!

First, the back story:
It all started about 3 years ago. I forget how it came up, but my friend Matt (-The Stig-) was trying to sell his 72 Nova; and it just so happened that I was in the market for a fun car (amazing how that happens). He bought it from a kid who blew the motor, so he had built a mild 383 and TH350 for it, which were in, but never finished.

After a couple months of piecing the car together, and working on it in my parent's driveway, it was alive! I drove it around a while with the sloppy stock suspension and steering, and the hard flat-spotted Dunlop Qualifier GTs. Alas I eventually I grew old of the boat-like handling and wanted to do something about it, but what?

I stumbled upon Pro-Touring while researching Trans Am suspensions and shortly thereafter I had a plan. After some sums of money were handed over to various companies, I had the "Starter Kit" to pro-touring: Hotchkis coils and leafs, an Addco front bar, shocks, some 17x9s wrapped in 255s, Brembo blank rotors, and Hawk pads. Boy did this make a difference!

I drove the car like this for another year and a half, hitting as many autocrosses as my budget would allow. I attended RTTC 1, and placed mid-pack in each event; I was stoked! Fast forward to this past September where a group of us PTers attended an autocross at the Camarillo Airport; I started talking to Brett Campbell (67z06camaro), and he offered to do some work on my car in exchange for promoting his new company, Fab-53. Sign me up!

And here we are.

The plan:
Lower the car to a frame ground clearance of ~4", correct the front suspension geometry problems associated with being so low, stiffen the front suspension assembly to accommodate the addition forces created, tuck the exhaust up above the frame rails, 315x35x17s on all four corners, create fender flares, install sub frame connectors, and install my C5 brake upgrade. All the while trying to keep my budget "theme" (read: constraints).

To battle the front-end geometry we will be performing the CR Mod (Campbell/Rasmussen), which is a sort of reverse Gulstrand Mod. We will move the LCA's frame-pivot point upward ~.75" along with outboard ~.75". Coupling that with tall lower ball joints and the LCAs should be near parallel to the ground at ride height and the camber-gain should be greatly improved. Another benefit to moving the LCA is it helps with the dreaded bump-steer as it gets the LCA and tierods onto the same plain. We will also be spacing the steering arm on the spindle to clear the wider wheels. To stiffen the front frame/suspension assembly we will be boxing and bracing portions of the sub frame, and trimming and boxing the stock LCAs.

Proposed ride height with tire test fit (only fenders have been cut at this point):


Pie cuts and clearancing of the LCA:


The reason for doing those pie cuts is that when the LCA is mounted further up the swaybar runs into the arm early on in the suspension travel. Bending the arm like this fixes that.

Pie cut to flatten the angle of the LBJ:


LBJ gusseted and plated:


LCA relocated and pie cuts filled:


Wrap around gussets on LCA:


At ride height with allignment done:




We also modified the UCAs for greater caster but I didn't get a picture of that. With a single 1/8" shim on the front of the UCA we have 1.5* neg camber and 5.5* caster. In 2" of suspension compression we have a gain of 4* camber IIRC.

This is how she will look untill after RTTC2. After that we will install the subframe connectors, fender flares, and my C5 brakes.