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 |   |  Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time
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Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time

Pandem widebody Hachiroku with FK8 Civic Type R swap shakes down at Streets of Willow.

Sam Du
Aug 26, 2020

Making history isn't easy as Dai Yoshihara can tell you about his AE86 with its first-ever turbocharged K20C1 engine swap. Throwing a modern Honda motor into an older Toyota is a daunting task, which is why despite Dai's car making its debut at SEMA 2019 inside the Turn 14 Distribution booth, the FK8 Civic Type R-powered project car is still running into obstacles, which was the story during his first shakedown at the Streets of Willow.

1986 Toyota Corolla GT S K20C1 Engine Photo 41/41   |   Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time

Our last update highlighted one of his first dyno sessions at PhatBotti Tuning in Anaheim, California. Controlled by a Link engine management system, this proved to be the cause of a lot of headaches due to the fact that the Link staff is based in New Zealand and had to communicate back and forth with local build partner Eimer Engineering in order to tune the car. Hours upon hours of collecting data, plus the difficulties of working with the K-series' direct injection, variable valve timing (VTEC) and an aftermarket fuel system resulted in weeks on end on the dyno without a solidified tune on the horizon.

With no experienced Link ECU dyno tuners in the state of California, coupled with the safety concerns of flying amidst the Coronavirus pandemic, Dai decided to load up his AE86 on a trailer and travel 15+ hours to Superior Soobie and Import, a shop ten miles south of Portland that's home to Link specialist Jason Oefelain. A full day was dedicated to data collection on the dyno and a second day was spent sorting out the final tune. Jason was able to design a file that makes roughly 300whp, but most importantly, it was safe for the motor and reliable. We weren't able to be there for the dyno session but check out Dai's YouTube Vlog for the full recap.

1986 Toyota Corolla GT S Pandem Widebody Kit 03 Photo 41/41   |   Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time

Upon returning to California, Dai piggybacked a local track day at the Streets of Willow with Remark USA where the "AE86R" would undergo its first shakedown. Watching from the stands, his car looked every bit as awesome as you could've imagined. JDM Sprinter aero, Pandem body kit with N2-style fenders, gold BBS Motorsport wheels and 'caged interior made the Corolla look right at home on the track. Dai had hoped for a day that was focused solely on fine-tuning things like the chassis and KW suspension, but everything was cut short after a weakness in the car's cooling system was revealed. Overheating, in turn, kicked the ECU into limp mode, which then wouldn't allow Dai to push the car any longer. A bummer.

1986 Toyota Corolla GT S Sprinter Trueno Taillights Photo 41/41   |   Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time

The next step for Dai and his team is to address the cooling issues as well as perhaps revisit the tune and see if there's a better file that can be achieved to see if the boosted four-cylinder can run effectively, especially in the scorching California heat. Dai's currently out at Pikes Peak International Hill Climb, but once he's back, we hope to have another update for you soon as he inches his way towards putting the final touches on in his Civic Type R-powered AE86.

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1986 Toyota Corolla GT S Dai Yoshihara 02 Photo 41/41   |   Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time
By Sam Du
1000 Articles
Toyota AE86: Dai Yoshihara's Honda K-Swapped Corolla Rips Around The Track For The First Time
1986 Toyota Corolla GT-S (AE86)
Owner: Dai Yoshihara
Hometown: Tokyo, Japan (now Los Angeles, CA)
Occupation: professional driver
Instagram: @daiyoshihara
Power: 306hp; 295 lb-ft of torque (approx. )
Engine: 2.0-liter four-cylinder turbocharged K20C1 crate engine from FK8 Honda Civic Type R adapted by Eimer Engineering; custom intake manifold adapter, bellhousing adapter plate, engine and transmission mounts; modified crossmember; replumbed stainless hard lines for brake and clutch master cylinder assembly; Spoon Sports valve cover; GReddy intercooler kit; Radium Engineering fuel cell surge tank; polished CSF Radiators dual-pass tucked radiator
Drivetrain: six-speed manual transmission from Honda S2000 adapted by Eimer Engineering; McLeod Racing clutch and flywheel; MA46/MA47 rear axle
Engine Management: Link Engine Management G4+ Force GDI direct injection ECU, wiring harnesses, custom tuning
Footwork & Chassis: KW Suspensions custom three-way coilovers; race-prepared chassis by Eimer Engineering including rollcage and bash bar; Techno Toy Tuning custom panhard bar and four-link rear trailing arms with spherical rod ends
Brakes: StopTech big brake kit
Wheels & Tires: 15x9" -30 front, 15x9" -75 rear custom BBS Motorsport wheels; 245/45R15 Falken Azenis RT660 tires
Exterior: Pandem widebody Kit by TRA Kyoto; Sprinter Trueno body kit, bumpers and taillights; Vision Autoworks custom Levin-style headlights with Honda Accord Euro R projectors; EVS Tuning dry carbon fiber mirrors; carbon fiber hood; OEM Honda Championship White paint
Interior: Link MXS Strada dash display by AiM; race-prepared interior and dash with APR carbon fiber finished by Evasive Motorsports; Sparco Racing QRT-R limited edition bucket seats, steering wheel, five-point harnesses, safety equipment; Speedway Motor collapsible steering column with quick-release; custom shifter and hydraulic e-brake; OEM Toyota TRD Pro Calvary Blue paint

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