Enhancing Circuit Thrills with Jimny Perfection
Rainbow Auto, famed for redefining Jimny’s circuit potential, continues to push boundaries in the world of automotive tuning. Known for their creative builds and bold ventures, they have made headlines recently by competing at Tsukuba Circuit’s “Attack Tsukuba” event, though an unfortunate overturn temporarily paused their momentum. Despite this, their resolve to innovate remains unshaken.
Modified Jimny at the circuit
Comprehensive Upgrades After the Incident
The demo car that suffered damage during the event wasn’t just restored—it was transformed. Rainbow Auto installed blister fenders and introduced a Quaife sequential dog box transmission. These modifications, along with their active participation in car events, aim to promote Jimny circuit culture.
Rainbow Auto’s repair and upgrade process
Leading with High-Precision Chassis Dynamometer
Expanding their technical edge, Rainbow Auto recently acquired the Australian-made PROHUB2000 chassis dynamometer. This cutting-edge equipment enables them to deliver even more precise ECU tuning. Known for their extensive expertise, Rainbow Auto is now equipped to elevate their ECU customization to a new level of accuracy and reliability.
The PROHUB2000 setup at Rainbow Auto
Affordable ECU Reprogramming Services
Utilizing tools from Alientech, Rainbow Auto provides ECU reprogramming for popular models such as the Suzuki Jimny JB23/64, Jimny Sierra JB74, and the Alto Works HA36S. Starting at an affordable ¥33,000, they offer in-shop tuning, nationwide mail orders, and even on-the-spot tuning services at select events or Super Autobacs stores.
ECU tuning setup by Rainbow Auto
Innovative “Record Breaker” Circuit Wheels
Rainbow Auto has also unveiled a new product: the “Record Breaker” wheels. Crafted in collaboration with Enkei using MAT technology, these forged wheels boast exceptional durability and lightweight construction. Sized at 17×7.0J with a +5 offset, they cater to circuit enthusiasts, further cementing Rainbow Auto’s commitment to Jimny performance.

Rainbow Auto isn’t stopping here; their unique approach challenges the conventional off-road identity of the Jimny, proving its prowess in circuit environments. The future of their trailblazing innovations is one to closely follow.






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