Turbo 2JZ swap story for a black IS300

Oct 19, 2026 Last reply: 1 hour ago 3 Replies
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The hardest stretch of this build came right after it was finished: the W55 gearbox let go with first, second, and third gears broken, after just 2,500 miles, leaving the car barely able to move. The turbo quit after roughly the same mileage too, clicking and scraping metal-on-metal as it slowed to a stop. The maker's response was practical: source a replacement W55, plan to reinstall the stock engine, and return the car to running condition so it could be sold, with a newly bought Supra taking over and the Lexus parked.



The swap itself moved quickly once rolling. Bought stock in September 2017, the original 2JZ-GE came out in October 2018, and the genuine VVTi 2JZ-GTE went in with its intercooler piping, first test drive by December of that year. March 2019 brought the Enkei SBC RPF1 wheels on Nitto NT555G2 rubber, then May the FIC 1650cc injectors. A Koyo radiator handles cooling, and a Centerforce W55 clutch sits behind the factory five-speed manual gearbox.



Several details stand out. Engine management is an AEM Infinity 506, with a laptop running the AEM tuning software appearing during the build. A PHR triple fuel pump hanger feeds those big injectors. The ABS unit was relocated and the battery now lives in the trunk. Exhaust work consists of a QTP cutout plus a Greddy catback. Outside, there is a front bumper lip and yellow-tinted fog lights over the black paint.



The payoff arrived on track: three passes at Kil-Kare Dragway without breaking anything, the best a 12.7854 at 117.13 mph with first-gear boost set to 8 pounds. What remains open is the gearbox plan. A setup targeting 800 wheel horsepower through a Tremec T56 Magnum was estimated near $10,000, yet it never happened once the Supra decision was made. Given how short the W55's life was, that seems like the one unanswered piece of this build.



Project by Christofo. Watch it on their YouTube channel:

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Dialing first-gear boost down to 8 pounds for the passes strikes me as clever. The W55 had already snapped three gears on a third-gear pull near 5,000 RPM, and keeping the first-gear load light seems like a sensible way to finish a 12.7-second run without another breakdown sitting on the return road.

One thing I am curious about: was the QTP exhaust cutout opened during the quarter-mile runs at Kil-Kare, and did opening it change how the Greddy catback sounded? My own view is that leaving it shut on the street would make the car far more liveable day to day.

If the Lexus ever comes back out, revisiting the Tremec T56 Magnum idea seems worth it. That setup, aimed at 800 wheel horsepower, was estimated at roughly $10,000 before the Supra purchase changed direction. The replacement W55 gets the car moving again for a sale, but with the original gearbox lasting only 2,500 miles, a stronger box looks like better footing for anyone chasing real boost.

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