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RR Racing Lexus IS250 OBD ECU Upgrade Tune
RR Racing Lexus IS250 ECU Upgrade Tune

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Our Price: $549.99
Sale Price: $494.10
Savings: $55.89

Availability: Usually Ships in 1 to 2 Business Days
Product Code: IS250TNE02

RR Racing 3XX Intake:

High Flow Air Filter:

My Lexus Model*:

My Model Year*:


This tune is for the following models with 4GR-FSE 2.5L v6 engine: IS250 2006+ models.

RR Racing is proud to release another Lexus tune! As with other Lexus models, the IS250 ECU is a very complex and sophisticated engine management system. As always, we have worked very hard over a course of many months on developing this tune using our IS250 6 speed shop car. We developed both on the dyno AND 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.

We admit that we were surprised at the power gain we were able to extra from this car! As you can see from the Dyno chart below (and in the photo catalog), we were able to gain a whooping 20 wheel hp just from the tune!

As with all of our tunes, this was not a weekend project for us, where we slapped a Lexus 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. In addition we use our sophisticated in-house AWD DynoJet 424x LINX to fine tune our calibrations. Our ECU tune enhances the following ECU functions/parameters, including but not limited to:

  • Direct Injection fuel mapping
  • Ignition control
  • Variable cam maps
  • Torque to throttle mapping (allows us to enhance throttle response)
  • Rev limit increase to 7200 RPM (helps the power curve)
  • We raised the shift points to higher rev limits in Sport and Sport+ modes (rev limit can only be reached in manual shifting with traction control off)
  • Raised the speed limit to maximum allowed by the ECU of 160 mph

Ordering Procedure

  • Please select this product and chose options.
  • We will ship you the OBD unit.
  • You will have to connect the unit to your OBDII port and 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 (one for each of the optional rev limits) applicable to your car.
  • The car needs to have the latest Lexus re-programming recall implemented by the 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 off-road 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: 4.5 of 5 4.5 of 5 Total Reviews: 7 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 RR racing tune Lexus is250 October 21, 2023
Reviewer: Thomas Hayek from Herriman, UT United States  
An amazing product! Definitely a noticeable difference!  Really wakes the car up, especially paired with the apexi throttle controller! Very happy with my purchase.

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  0 of 0 people found the following review helpful:
5 of 5 2014 is250 August 9, 2023
Reviewer: Joshua Courier from Huntsville , AL United States  
Excellent upgrade for ECU, smoothed out power curve, smoothed out transmission shifting. Worth the money in my opinion

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  0 of 0 people found the following review helpful:
4 of 5 Great tune made all around driving so much better July 31, 2023
Reviewer: Justin O'Donnell from Cornelius, NC United States  
I got it and some other performance items as in intake and injectors.  The tune let it all work together and perform better. Only thing is once I got my tune I’ve tried reaching out to RR racing for some questions but am getting nothing back.

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  0 of 0 people found the following review helpful:
5 of 5 RR Racing is the best facts June 6, 2023
Reviewer: George Cartagena from Kissimmee , FL United States  
You guys all did an amazing job with the tune and air intake for my Lexus is250 when I was down and out RR Racing showed me how it’s done thank you guys !

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  0 of 0 people found the following review helpful:
5 of 5 Smooth Power Curve & Shift Points April 29, 2023
Reviewer: Jetson Chong from Edmonton, AB Canada  
All of the Lexus IS250s should have came like this stock to begin with! I drive a 3rd gen IS and all I can say is this is a great tune for such smoother shift points and way easier time getting up to speed in the top end of the power curve! Hit 170kmh (105mph) a lot quicker than stock! Great tune!

Also noticed driving normally seems to be a lot smoother with the shifts, and the throttle response is a lot more lively.

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