GR Yaris Forged Build – From Near Standard To 479BHP

We’ve just finished another Toyota GR Yaris build, transforming this car from more or less standard, with only an exhaust fitted, into a serious performance machine.

For this build, we carried out a full forged engine build and tested the unreleased Artec Sport 450 turbo, a bolt-on unit using Garrett G25-660 internals.

We also added flex fuel capability, allowing the car to run ethanol blends. Due to the limitations of the stock fuel pump, the setup is currently running at E20 (20% ethanol).

Full Parts List

Engine Build:

• Closed deck block insert
• Nitto pistons https://www.garagewhifbitz.co.uk/nitto-forged-pistons-gr-yaris/
• Nitto conrods https://www.garagewhifbitz.co.uk/nitto-i-beam-conrods-gr-yaris/
• HKS head gasket https://www.garagewhifbitz.co.uk/hks-grommet-type-head-gasket-gr-yaris-g16e-gts
• DP head studs https://www.garagewhifbitz.co.uk/dp-h11-head-stud-kit-g16e-gts-gr-yaris-gr-corolla/
• Kelford 267A cams https://www.garagewhifbitz.co.uk/product/kelford-266-274-camshafts-gr-yaris/
• Kelford valve springs https://www.garagewhifbitz.co.uk/product/kelford-valve-spring-kit-gr-yaris/

Turbo & Supporting Hardware:

• ARtec Sport 450 turbo (Garrett G25-660 internals)
• Airtec intercooler https://www.garagewhifbitz.co.uk/product/airtec-intercooler-upgrade-toyota-gr-yaris/
• Airtec big boost pipe kit https://www.garagewhifbitz.co.uk/airtec-motorsport-big-boost-pipe-kit-toyota-gr-yaris/

Fueling & Management:

• DW DeatschWerks 1100cc injectors https://www.garagewhifbitz.co.uk/dw-deatschwerks-1100cc-injectors-toyota-gr-yaris/
• Syvecs ECU https://www.garagewhifbitz.co.uk/product/syvecs-gr-yaris-plug-in-ecu/
• Flex fuel sensor kit

Drivetrain:

• Xtreme Performance Heavy Duty Organic Clutch Kit (incl. flywheel & CSC) https://www.garagewhifbitz.co.uk/product/xtreme-performance-heavy-duty-organic-clutch-kit-incl-flywheel-csc-gr-yaris/

Oil System:

• Lamspeed Racing baffled sump https://www.garagewhifbitz.co.uk/lamspeed-racing-toyota-gr-yaris-corolla-baffled-sump-kit/

Garage Whifbitz Parts:

• Garage Whifbitz Big bore decat GPF delete pipe https://www.garagewhifbitz.co.uk/garage-whifbitz-gr-yaris-big-bore-race-pipes/
• Garage Whifbitz Billet inlet manifold (larger throttle body) https://www.garagewhifbitz.co.uk/garage-whifbitz-gr-yaris-gr-corolla-g16e-billet-inlet-manifold/
• Garage Whifbitz Carbon fibre engine cover (matt finish) https://www.garagewhifbitz.co.uk/product/garage-whifbitz-carbon-fibre-engine-cover-gr-yaris/?attribute_select-finish=Matt+Carbon
• Garage Whifbitz Matt fuse box cover https://www.garagewhifbitz.co.uk/garage-whifbitz-carbon-fibre-fuse-box-cover-gr-yaris

Intake System:

• Eventuri matt carbon intake kit https://www.garagewhifbitz.co.uk/product/eventuri-gr-yaris-carbon-intake-kit/

On the dyno, the results speak for themselves:

• Pump fuel: 377whp / 450bhp

• E20 fuel: 402whp / 479bhp

This GR Yaris is a huge step up from where it started and is now delivering serious performance on both pump fuel and ethanol blend.

Looking to build your own GR Yaris?
Whether you’re after a forged engine, turbo upgrade, or a complete package like this, we can tailor a setup to suit your goals and budget.

Get in touch with the team at Garage Whifbitz to discuss your build:

• 📞 Call us
• 📧 Email us
• 💬 Or send us a message on social media

Let’s turn your GR Yaris into something special.