Unfair “Stack”s the odds for a dash display

Project Unfair won’t be using standard gauges. Instead, we are going to use the integrated dash display from Stack Systems. The Stack display has several advantages over traditional gauges:

  • It allows the dash to be completely visible through the steering wheel. No more disco head-bob to see the gauges hidden behind the wheel.
  • It’s programmable so that limits for each supported sensor can have alarms defined. Things like low oil pressure and too hot water temperature can turn on a light and then show the value of the sensor. When you’re on the track, you don’t have time to scan all your gauges to look for problems.
  • It allows fine-tuning of your fuel tank sensor, so you’ll know within the gallon of how much fuel is left in the tank.
  • It integrates with a data recorder so that data can be played back and analyzed later, along with data directly recorded such as sensor data for ride height, steering angle, and brake line pressure.
  • The data recorder will be integrated with the Holley Dominator ECU allowing analysis of nearly all the available sensors in the car at the same time using the amazing DataPro Analysis system. No more coming in after a few hot laps with some sort of vague driver “It felt a little weird” or “the car was turning in slowly”. With DataPro, we’ll be able to tell exactly how the car responds to changes in tuning, be it suspension, braking, or engine.
  • The wiring is dead simple. A single 19 circuit mil-spec connector provides all the connection needed.


Check out all the available real estate on the dash when it’s all integrated into a single display. The gauges on the lower right are boost and lambda gauges. We’ll integrate their sensors into the data recorder as well, though the dash display doesn’t have direct support for them. We’ll put A/C vents in the space to the left and right of the display, and the traditional headlight and wiper switches on the lower left.


Here’s a closer look at the display, gauges, and recorder. The single harness is all that is needed for all the traditional dash gauges: oil pressure, water temp, tach, speedometer, odometer, fuel level, oil temp, fuel pressure, and voltage level. It also supports display of lap times (we will be installing a lap time sensor).

Unfair’s Interior Fabrication

We are using a very interesting new material for Unfair’s interior. It’s called Airex C70.

AIREX® C70 is a lightweight, closed cell foam for universal use in sandwich constructions. Its excellent stiffness and strength to weight ratio and high toughness make it suitable for a large variety of applications. The foam is ideally suited for statically and dynamically loaded structures and is compatible to all resin systems.

Our friend and collaborator Guillermo (William) Fonseca of 1Off Rides is working on the interior panels using this awesome material. It can be fabricated as though it were MDF (the standard material for speaker boxes). It cuts fine with woodworking tools, and can be glued or screwed together to make complex shapes. Once the shapes are glued/screwed together and all the panels sanded/finished to fit, you can use ordinary fiberglass mesh and resin to make the shapes permanent.


Unfair Rear suspension and Spohn’s Del-Spheres

When Art Morrison first approached us with the idea of the transforming / combination 3 and 4 link rear suspension, we loved the idea. And after I thought about it a bit longer, I called Matt Jones (their suspension engineer) at Morrison and told him to be sure and design the brackets of the new suspension to use Del-Spheres. Matt took some measurements and they were able to accommodate us.

As a result, Steve Spohn’s Del-Spheres are all over the rear suspension on Project Unfair, and for good reason. I first used Del-Spheres on my previous project (II Much) when the original rod ends started to wear (after a few hundred miles) and started to transmit NVH (noise, vibration, and harshness) into the car. I swapped the rod-ends to Del-Spheres and it greatly reduced the NVH, with no loss of accuracy or articulation.

Strictly speaking, the Del-Spheres don’t have quite as much misalignment capability as a rod-end, but for rear suspension linkage arms like Unfair’s combination 3 / 4 link, it offers plenty with no loss of strength. The main body of the Del-Sphere is forged steel, with a forged ball. The body and ball are separated by Delrin rings, and the body incorporates a rebuildable and grease-able design that allows for the quiet of rubber and the accuracy of steel.

We’re confident the car will have excellent handling and ride characteristics, as well as handle the 1200 hp the engine will put when we put the hammer down!


Here’s the whole rear suspension in what Frank and I call “5-link” mode. 🙂 Note how the Del-Spheres are used on all the control arms except the Watts link.


This is the road racing setup with a 3 link. For drag racing, the upper control arm in the middle is removed and replaced with two control arms on the side. The Del-Spheres provide the misalignment we need for turning the car on the 3 link setup, and the strength for 1200 hp launches on the 4 link setup.


Here’s a closeup of the Del-Sphere, screwed into one of Unfair’s 4 link upper control arms.


Taking off the pre-load adjuster shows the Delrin inserts and how they isolate the ball from housing.


Here’s a complete disassembly. The forging line in the housing is visible.