Lexus GS 350 (3.5i V6) 306 hp — Stage 1 file (+10 hp)

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Chip tuning for Lexus GS 350 (3.5i V6) 306 hp ECU

Lexus GS (2005) 350 (3.5i V6) 306 hp — premium petrol engine of the passenger segment of the Toyota Motor Corporation group (Япония, 1937). Stage 1 chip tuning raises power from 306 to 316 hp (+10 hp, +3%) and torque from 376 to 396 Nm (+20 Nm). In the CHIPOK database: 2 configurations. The 2005 generation — old-era petrol ECUs (ME7/ME9/MED9/Simos) with easily readable memory.

Lexus specialises in premium saloons and SUVs. Lexus shares platforms and engines with Toyota's premium segment. Lexus is the premium sub-brand of the Toyota Motor Corporation, launched in 1989. Toyota has historically focused on naturally aspirated, high-compression engines. Denso is Toyota's in-house ECU supplier (a locked platform). Toyota's petrol range spans naturally aspirated Dynamic Force engines and turbo units for the GR series.

Toyota has an active JDM tuning community (GR Supra, GR Yaris, GR86). The Denso ECU is a locked Toyota platform, and most models do not respond to standard chip tuning. The GR models (Yaris GR, Supra) have a growing tuning culture. High-output Toyota GR models sit in the performance segment with solid Stage 1 headroom.

Frequently asked questions

What power gain do you get after chip tuning the Lexus GS 350 (3.5i V6) 306 hp?

The Stage 1 gain for the Lexus GS 350 (3.5i V6) 306 hp is 10 hp (+3%) over the stock 306 hp, for a total of 316 hp. Torque rises from 376 to 396 Nm (+20 Nm).

What is Stage 1 chip tuning for the Lexus GS?

Stage 1 chip tuning of the Lexus GS is a rework of the ECU maps: boost pressure, ignition advance, target lambda and the removal of factory torque limiters. The gain is +10 hp with no hardware changes.

Is Stage 1 safe on the high-output Lexus GS 350 (3.5i V6) 306 hp?

The high-output Lexus GS 350 (3.5i V6) 306 hp has a conservative factory calibration aimed at the mass market. Stage 1 unlocks the engine's real potential while turbo and injector life are preserved.

How much does Stage 2 add on the Lexus GS?

Stage 2 on the Lexus GS 350 (3.5i V6) 306 hp means software + hardware (exhaust, intake, intercooler). The gain depends on the specific hardware combination.

What happens to the Lexus GS warranty after chip tuning?

The factory warranty of the Lexus GS does not remain valid after Stage 1 — the manufacturer withdraws its obligations once the ECU software is changed. CHIPOK provides its own warranty on its work and support.

How long does remapping the Lexus GS take?

On the Lexus GS 350 (3.5i V6) 306 hp: OBD flash 25-30 minutes, Bench (if required) about an hour. The file processing itself takes 5-30 minutes once the original bin is received.

Is the original file kept when chip tuning the Lexus GS?

Yes, the original ECU firmware of the Lexus GS 350 (3.5i V6) 306 hp is kept and can be flashed back at any time. Returning to stock via OBD takes 25-30 minutes.

What is the price of a Stage 1 remap for the Lexus GS?

Stage 1 for the Lexus GS 350 (3.5i V6) 306 hp is paid for with CHIPOK credits (1 cr = 1 €). The final amount is set in the calculator, taking the extra options (off functions) into account.

Last updated: 31.08.2026 · Source: manufacturer technical documentation · Measurements: CHIPOK dyno