Mazzei Formula 5 Rotor Turbo SLC


My name is David Mazzei with Mazzei Formula LLC. Background is in rotary engines and tuning. This week we are beginning our new project with an early model SLC, purchased from the family of a recently passed member, David Preece. David was a big rotary enthusiast, super awesome guy, with dreams of completing a 3 rotor project in this platform. His wife had listed this car for sale, and we came down to San Francisco, from Alabama to pick it up and continue the legacy. Super thrilled to be able to finally work on one of these cars, and thankful for all of those who have pushed the envelope in this platform. Seems like a very tight and friendly community. Stopped by QRP in stockton and had awesome few hours talking with Ted and Don, checking out there amazing work while talking aero, suspension, and racing.

Currently working with Todd Budde from Forcefedfab in San Antonio, who is assisting in the major chassis fabrication required, and professional imsa driver Bryan Leonard, who will be testing/chassis tuning the platform upon completion, and assisting in development of aero/suspension

The Goal:
5 Rotor, first one in the world. Crank shaft is currently off for balancing. We plan to run a billet engine, full peripheral port, and a modified g57 turbo to achieve around 1500rwhp and produce a v10 f1 sound. Rotary fires 1x per rev, 4 stroke piston fires once ever other rev. With the 72* lobe angle offsets, and an equal length 5 into 1 collector with merge angle and collector design mimicking the 787b 4 rotor, we theorize it should sound identical to a v10 f1 at 18,000 when running at 9k rpm. Major third harmonic, 1 being root tonic, and the 3rd and octave above the root.

Intake will be water to air intercooler plenum, we will run 3 heat exchangers, 2 oil coolers

Mechanical fuel pump cable drive, custom bulkhead / tank built around the engine

Holinger MTX transmission with geartronic paddleshift


Picture of the last project, the Mazzei Formula 4 Rotor Turbo RX7

4 rotor 1.jpg


Road Atlanta Global Time Attack

Barber Motorsports with PCA


Autoclub Speedway with the 767b


Current progress:

Firewall Cut, dummy block fitted with a g52 transaxle. Will be using the dummy block and transaxle until the MTX arrives from Hollinger. Dimensionally they're very similar so this should allow us to fabricate the fuel tank/turbo/manifolds etc


Body sitting on frame.


Planning to run a sump on bottom of custom fuel tank, that is equal depth to bottom of frame rail, and run a pickup up to mechanical fuel pump that will be cable drive off the dry sump pump

Really looking for headlight lenses if anyone knows where to find any? Having a hard time with any contact with factory, assuming there really busy right now

Thanks guys, hope to meet some of you soon!
Knew I recognised the name!
Welcome, have been loving your FD for a while now. Nearly bought myself an old JGTC style Time Attack RX a few years ago.

Cant help much with SLC’s personally but good luck with the project and look forward to seeing its progress.

Theres a gaggle of smart buggers on here if you ever need assistance - also useless sods like me if you ever need to feel better about yourself:D
Plenty of SL-C owners here and also Fran who owns RCR too.
Following with interest. Let me know if you need any help with the Holinger. I'm running the MFT Transaxle and pneumatic shifter set up, and the Holinger Engineering factory is 20 minutes from my factory.
That was a local car to me - good to see David's car go to a 'proper' home. No one knows more about how to make these cars go fast and long than Ted and Don. Keep posting, I'm sure you will have many followers here.
Thank you guys!

Currently just trying to source parts at the moment. Once we finally get ahold of the seats we're looking for then it should be time to finish the roll cage, mount the pedal box, steering column, and fabricate the bulkhead/fueltank(s)!

Tentatively planning to run 3x radiators on the car. Starting with 2x mounted in the rear (side pods), and 1x in the nose. 2x of the coolers will be on a circuit in a series, using two CWA400's, one for feed, one for return, to keep flow rate / pressure up, as it will have to feed through the 5 rotors, and two cores. The third radiator will be utilized for the water to air intake manifold plenum with a 3rd CWA400. All lines will be BMRS throughout the entire vehicle. Likely going with -20 or -24 for coolant hoses up/down the spider rather than coolant tubes. We will also be mounting two bar/plate style HD oil coolers with 16an inlet/outlets in the nose, on either side of the splitter. The air from the traditional brake duct inlet will be ducted through these oil coolers. We will be looking at one false headlight on each side to function as brake duct inlets.

Working with Holinger to develop a clutch/flywheel and intergrated bellhousing solution to adapt directly to the rear of the engine, so that we do not need an adapter plate

Working with Billet Pro/Promaz to see options for billet engine, at very least 3x billet main plates for the 26b style stationary gears,

Working with an aftermarket turbocharger company to develop a 118mm wheel to replace the 106mm on the G57 garrett, waiting on confirmation on my flow data, charted from the 4 rotor engine. Moving to the 118mm with the 20% larger g57 turbine over the GTX55 should perform relatively similar to the 4 rotor in terms of EMAP / MAP Ratio, EGT, spool characteristics etc

Also looking at fitting 680mm Michelin slicks, with section width of 353mm on the rear, might require clearencing the spider/rear clam a tad on the lower portions of the wheel arch,

And as we know the C4 wheel bearings aren't too trusy, hopefully at some point we can address this, maybe upgraded uprights or etc...

Alot to do for now in sourcing parts, should be some updates in the next few weeks when things arrive!

Thanks again guys!
You can get by with the c4 stuff up front for a while. But no sense in wasting your time trying to make the c4 last in the rear. Bite the bullet and upgrade now, save yourself the pain later.
Amazing project, looking forward to see this monster run. The sound alone should be epic. Please keep us posted. Welcome to the SLC family .


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Randy V

Staff member
Lifetime Supporter
About 15 years ago, I was racing my American Sedan Camaro and leading my class. I ended up along side a 4 Rotor NA car that was in the class above mine. It put out such an ear splitting screech, I thought my ears were going to start bleeding. Mind you, I am wearing my radio ear-bud speakers and inside a full coverage helmet. After 1 lap with this fellow in close proximity, I decided to just back-peddle it until I saw the second place car in my class in my rear view mirror.. Good GOD was that thing loud!!!!! Of course he got meatballed and brought into Sound Control - but he just let the infraction go to the end of his race...