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RR Racing Lexus IS/GS 350 OBD ECU Upgrade Tune
RR Racing Lexus IS350 and GS350 ECU Upgrade Tune

Our Price: $500.00

Availability: Usually Ships in 1 to 2 Business Days
Product Code: IG350TNE02

RR Racing 3XX Intake:

High Flow Air Filter:

My Lexus Model*:

My Model Year*:


Please note that our Carbon Intake are now available as an option with this product at a discounted price!

We are happy that finally we found a reliable OBD tuning device solution for our Lexus IS/GS350 (2gen) engine control unit (ECU) upgrade tune! Now our 2nd gen customers do not have to send their ECU for upgrade anymore.

The Lexus 350 is a very complex and sophisticated engine management system. We have worked hard on developing this tune, both on the dyno AND testing extensively on the road. We have thoroughly tested various changes in order to optimize power and torque effectively while retaining stock fuel efficiency, knock control sensitivity, and other built in safety features.

So as you can see this was not a weekend project for us, where we slapped on ISX on the dyno, played around a bit for a day or weekend, and and now we are selling a tune. We had done most of our development on the road, under real world conditions, doing hundreds of runs, datalogs, and hundreds of miles of testing between re-maps in order to determine how the ECU reacts to changes and adjust learning parameters. We have developed a full understanding of the following ECU functions/parameters, including but not limited to:

  • Direct Injection / Port Injection fuel mapping
  • Ignition control (350 has base ignition maps, cam timing dependent ignition maps, knock correction maps)
  • Variable cam maps
  • Torque to throttle mapping (allows us to enhance throttle response)
  • Rev limit increase to 7200 RPM (helps with power curve, but please see note below)
  • Raise the speed limiter

Our on road impressions are that the 350 pulls much more smoothly and linearly, with excellent midrange and top-end improvement. One of the most effective changes to the 350 is increasing the rev limit to 7000 or even 7200 (later may have more impact on engine life). As you can see from the dyno results below, the 350 continues to pull all the way to the revised 7000 rpm rev limit (7200 Dyno is not available at this time). This results in significantly more "area under the curve" and better acceleration times.

Please note that 2nd gen IS and GS models need to be in manual mode with traction control off to allow shifting at rev limit. We found out that some GS model do not shift manually even in manual mode. We do not tune the transmission to change this behavior.

We estimate between 10 to 15 whp and wtq gains with this tune.

All of our extensive dyno testing is conducted on a top-notch climate controlled Dynojet 424x all wheel drive testing facility.


Ordering Procedure

  • Please select this product and chose all required options as follows:
    • Model Year: we need to know the model year of your IS350
    • Please note that the tune already includes maps for all other common mods such as headers and exhaust.
  • We will ship you the OBD unit.
  • You will have to read the ECU ID (you will need a Windows computer).
  • Then you email us the ECU ID, and we will email back the tune files applicable to your car.
  • The car needs to have the latest Lexus calibration file implemented by your Lexus dealer.
We recommend to read our technical tuning blog for more useful information about tuning.

If we make any version updates to this tune, we will make any such version updates available to our customer free of charge.

Important Disclaimer
RR-Racing cannot ensure the applicability of manufacturer's or third-party warranties after performing this modification. Likewise, RR-Racing does not provide any warranty, written or implied, to the engine or drivetrain of your vehicle. RR Racing is not responsible for any accident caused by the use of our products and ECU upgrade -- our products are intended for race track use solely at purchaser's risk. By buying this product, you agree to the terms of this disclaimer.

The tuning device that we ship is easy to use and it comes with step-by-step instructions. There is a need for a Windows based computer to download and upload files from the device. Basic ability to use personal computers is required.

RR Racing cannot guarantee to be able to tune certain non-US vehicles. If we cannot tune a non-US vehicle, we will refund the cost of the tune upon return of the tuning device. Shipping cost is the risk of the customer and is not refundable.

Other FAQs:

Why do you provide a range of “tuned gains,” not a precise value?
There are many factors that influence dyno results and lead to variability in power measurement. Additionally, your ECU is constantly making changes based on sensor feedback that significantly influence engine output – and this is the case even on a stock ECU. So bottom line is that regardless of the mod you install, actual gains will vary. We make every effort to provide actual, factual, and transparent dyno data for our customers.

Do you recommend aftermarket intakes?
At this time, we do not recommend any aftermarket intakes that remove the factory airbox.

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Average Rating: Average Rating: 3.5 of 5 3.5 of 5 Total Reviews: 4 Write a review »

  0 of 0 people found the following review helpful:
1 of 5 Used items November 12, 2023
Reviewer: BEWARE from United States  

Received an open box item, there were signs of torn outer box, the cables were not neatly dressed nor any of the items in new plastic wrap.
I contacted customer service about the order, their response was they never specified the OBD unit or any of the cables are new. This company is a scam, they come down with this technicality, I lost my case with the credit card, as it is true nowhere does it say it is a new device or new box, but seriously? you have to be this cheap?
They also do not specify the items are used, or returned and resold to someone else if the tune did not work for somebody else. Their defense is as long as the tune is not linked to another vehicle they can sell it without having to disclose it is a returned item.
I asked for a replacement box, as mine arrived torn, they denied it. I like to keep brand new, I still have original boxes from my Nintendo 64, Nikon D60 camera, stored in the basement.

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  1 of 1 people found the following review helpful:
3 of 5 IS350 Tune June 3, 2023
Reviewer: thomas Granville from CA, United States  
For rev limiter to work at 7K to 7200 RPM you need to be in manual mode with traction control off. Traction control doesn't always stay off so it's a bit tricky and doesn't always work. I'd say this tune was a bust for me not much of a difference from stock.

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  0 of 0 people found the following review helpful:
5 of 5 Awesome March 1, 2023
Reviewer: Alvaro Hernandez from Des Plaines , IL United States  
Shipping was a little on the slow side but well worth the wait. Theses guys know what there doing when it comes to tuning. If your thinking of tuning your car do it I have no regrets.

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  0 of 0 people found the following review helpful:
4 of 5 ECU tune January 29, 2023
Reviewer: Songsheng Cai from Baldwin Park, CA United States  
This is only felt when manual.

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