Turbocharged K24A-Powered Tube-Frame Street Car 6-Speed
- Chassis: CA976247
- 6k Miles Shown
- Turbocharged K24A 2.4L Inline-Four
- Roof-Fed Intercooler
- Acura 6-Speed Manual Transaxle
- OS Giken Limited-Slip Differential
- Metallic Green Bodywork
- Gray Bucket Seats
- AiM Digital Dash Unit
- Staggered-Width 17" Wheels
- Wilwood Disc Brakes
- Custom Tube-Frame Chassis
- Pushrod Front Suspension
- QA1 Coilovers
- Fenders, Book & Car Cover Included
BaT History (1 entry)
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This mid-engined tube-frame car was designed and built by the seller from 2007 through 2013, at which point it was registered in California for street use. During the ensuing years, the car was updated and tuned as it was driven on the street and at various HPDE events by the seller. In 2016 the engine failed, prompting the installation of a turbocharged Honda K24A 2.4-liter inline-four, which is mated to an Acura six-speed manual transaxle with an OS Giken limited-slip differential. The bodywork is composed of aluminum and fiberglass panels finished in metallic green, and gray fixed-back bucket seats are mounted in the cockpit along with Crow six-point racing harnesses. Other features include a roof scoop that feeds an intercooler, a Garrett turbocharger, an AEM Infinity ECU, an AiM digital dash, a 13″ Momo steering wheel, a fire extinguisher, staggered-width 17″ wheels, Wilwood disc brakes, a pushrod front suspension, and QA1 coilovers. Approximately 6k miles have been added by the seller. This custom open-wheel car is now offered with unfinished fiberglass fenders, a book, a car cover, and a clean California title in the seller’s name that lists the car as a Specially Constructed vehicle.
The car utilizes a 1.5″ steel tube frame covered with riveted aluminum paneling that has been finished in metallic green (Toyota Spruce Mica, 6V4). The fiberglass nose of the car resembles a Lotus Seven and features hot-rod-style headlight assemblies, while the rear engine cover is finished in flat black and is attached with Dzus fasteners. The seller notes that the nose tilts forward and can be removed via a pin-lock mechanism, and the glass windshield is a flat single piece. The roof scoop feeds a rear intercooler. A clear bra has been applied to the nose, and the seller notes cracks in the nose, a dent and scuffs in the driver-side rear panel, scratches from the rear tires on the side panels, and stone chips.
The front suspension utilizes pushrods with tubular control arms as well as a steering rack and uprights designed for an NA-generation Mazda Miata. In the rear, upper control arms are paired with lower lateral links and trailing links, and each corner is equipped with two-way-adjustable QA1 coilovers. The seller states that the vehicle specifications are as follows:
- 72″ wide and 135″ long
- Approximately 1,650 pounds
- 35/65 front/rear weight distribution
Gray Y-spoke Sport Max Racing wheels measure 17×7″ up front and 17×9″ at the rear, and in 2018 they were mounted with 205/40 front and 275/40 rear Nitto NT01 tires. The unassisted braking system makes use of four-piston Wilwood calipers and directional 11.75×0.81″ floating rotors sourced from V8Roadsters.com. The steering is also unassisted.
The interior features fixed Ultrashield bucket seats in gray cloth with Crow Enterprizes six-point racing harnesses that were purchased in 2012. The custom dashboard features a glovebox and various switchgear, and a fire extinguisher and the battery are mounted in the footwell on the passenger side. The wiper switch has not been connected, and the seller notes that drivers larger than 6′ or 200 pounds may not fit in the vehicle. A storage area is located under the tilt-up nose.
A 13″ Momo steering wheel is mounted to a quick-release hub ahead of an AiM digital dash unit. The digital odometer shows 6k miles, and the seller notes that wiring provisions for a horn are present but no horn is installed.
The engine cover and the roof-scoop intercooler assembly have been removed in the photo above to expose the mid-mounted Honda K24A 2.4-liter inline-four and twin-scroll Garrett GTX3576R turbocharger. The engine is said to have been sourced from a 2004 Honda CR-V and was built to a 9:1 compression ratio by Drag Cartel of Simi Valley, California with an Acura TSX cylinder head and a four-stage dry-sump oiling system. Other features include a Barnes Systems oil pump, a Mocal oil-to-water oil cooler, a Griffin dual-pass aluminum radiator, a supplementary electric water pump, and a 14-gallon stainless-steel fuel tank. Either 91 octane fuel or E85 ethanol may be used. The seller notes that there is no muffler, the crankcase ventilates below the engine, and the timing chain occasionally rattles upon startup.
The engine is controlled by an AEM Infinity unit, and tuning was performed by Church Automotive Testing of Los Angeles, California. Dynamometer results indicate a peak output of 536 horsepower and 448 lb-ft of torque, which was measured at the rear-wheel hubs on E85 ethanol fuel. The seller states that the engine was built for a maximum designed rpm of 9,400, but an 8k-rpm redline has been set.
Power is delivered to the rear wheels through an Acura-sourced six-speed manual transaxle from Synchrotech Transmission, which utilizes MFactory gears and carbon-lined synchros. The OS Giken limited-slip differential features a 4.389:1 final-drive ratio, and the half-shafts were custom built by The Driveshaft Shop to mate the Acura transaxle spline pattern with the Miata rear hubs.
The California BAR SB100 label was applied in March 2013 and indicates that the car is a 2008 Specially Constructed Lotus. California-assigned VIN CA976247 is used on the California title; a redacted image of the title is pictured in the gallery, and it refers to the vehicle as a Specially Constructed convertible without a model year.
A set of unfinished fenders will accompany the car along with book Midlana written by the seller, build documentation, a horn, a lug-nut socket, wipers, and a Miata car cover. The build is archived on the seller’s website, and more than 15 videos from the seller are provided below.