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I was leaning towards Performance White on the headers, but I decided to go with Performance Graphite. It matches my color scheme better and it will be less likely to show wear. Zirocotec ThermoHold Performance Graphite The catalytic converter assemblies will generate a lot of heat so I had...

Brian, IMO Zircotec offers the best solution for my use case. They have pedigree in motorsports including F1 and halo/supercar OEMs, a patented coating and significant intellectual property around the process. They have a rigorous preparation process that include washing with a strong detergent...

Brian, After a lot of research, I'm going with Zirotec's patented ThermoHold coating. Most ceramic coatings consist of ceramic chips suspended in a polymer. They are applied with a spray gun and then baked (Zircotec also offers a lower-performance coating like this). ThermoHold is more akin to...

I’m finishing that last couple of items on the headers and catalytic converter assemblies before I have them ceramic coated. The headers and merge collectors have double-slip connections which are typically secured with springs similar to the one shown below. Instead, I used these cast...

To improve the serviceability of the tail subframe I sectioned the 1/2” tube in two places. However, the smallest tube connector I could find was for 1” tube. I considered machining them, but I need four and each requires multiple lathe and mill / rotary table operations. Given that my standards...

I had C&R Racing design and fabricate a custom radiator and shroud for my SL-C. I was able to increase the width of the radiator while adding two isolators per side. Apparently the side tanks only need to be wide for the inlet and outlet tubes. They used this isolator from McMaster...

I spoke with him a couple of weeks ago and he was machining new bell cranks on his CNC machine. He's been busy with family and work and hasn't had a lot of time to work on the car.

The heat shields that protect the chassis from the headers are finished. They were complex because the stock 2”x 2” chassis rails aren’t parallel nor co-planar and, complicating matters, I scalloped four of the chassis tubes to accommodate the headers. In addition, there were several hoses in...

I built mine on top of a hydraulic lift table. The advantage is that I can adjust height and use it for other tasks. When not in use, I can stack stuff on it or lower it and push it under a bench or shelves so that it doesn't take up space. I fabricated two engine mounts which bolt to the top...

Chris, I'm no expert, but here's my thoughts. Engines have hot spots and you need a fair amount of coolant flow to keep temps even and prevent flash boiling. The mechanical pumps that I've seen have an internal 5/8" bypass which is critical when the thermostat is closed. IMO, without flow a temp...

If it were me, I'd locate it in the nose after the radiator and take as much care as possible to minimize constrictions on the way to the engine. This maximizes pump head and relocates a small amount of weight forward and low. The endurance SLCs built by Agile Automotive had the water pump in...

On an LS, each side has an inlet and an outlet, so the adjacent ports can't be combined. There must be four discrete connections and an LS mechanical pump just does the routing internally. While more connections results in more potential failure points, I'm using high-end hose and Wiggens...

Neil, I'm not sure what you're referring to. Those fittings have as large of sweep of any fitting that I've seen with that ID. In addition, those fittings are a lot more exotic than AN fittings. They have an O-ring-boss (ORB) connection on one side and a Wiggens clamp on the other side. I...

I agree with everything that Howard has said above, but I'll add the following: The plan is not use a thermostat A shroud is important if you're using fans. I also have a custom C&R radiator which is a nice piece of kit. I also had them also provide proper vibration isolation and a shroud...

The heat shield for the induction tube was fabricated from 0.062” 5052 aluminum sheet and two pieces of aluminum tube. I’ll add reflective foil to the hot side in the future. I’m halfway through the heat shields, six completed and six more to go.

To optimize cooling, it’s imperative that all air that flows into the radiator inlet in the body is forced through the condenser and radiator. This is best accomplished via an air-tight, diverging duct that provides a smooth transition from the opening in the body to the outer edges of the...

I have an Aerovault MkII for my SL-C and I love it.

I can't comment on the gear position sensor because I don't have a Graz, but your PDM should ensure that the clutch is engaged before engine start. That's what OEM's do and it makes things safe irrespective of gear position. I have pressure transducers on the clutch, front brake and rear brake...

I also like the aluminum look. My plan is to brush the chassis and use one of the clear, air-cure Cerekote finishes specifically designed for aluminum. I also plan to coat all of the CNC parts less the brushing step because I like the machining marks. Although i don’t have any experience with...