RR Racing is proud to make history by being able to offer an OBD device tune for Lexus IS-F engine control unit (ECU) based on our famous ECU upgrade product!

Please note that we now offer the ECU tune in combination with our Tuned Intake and as part of the Performance Upgrade product

The Lexus IS-F ECU is a very complex and sophisticated engine management system. RR Racing has been developing this upgrade tune for many months, intimately understanding IS-F ECU's parameters and structures, testing various changes to optimize power and torque effectively while retaining stock fuel efficiency, knock control sensitivity, and other built in safety features. During the development and testing period, we have logged many track hours and over 2,000 miles of road testing and road-dyno logging with many more hours spent on a sophisticated Dynojet dyno at a top-notch climate-controlled facility. Then we tested various OBD units, and only when we were convinced that the device is reliable, we released it as a product.

So, as you can see this was not a weekend project for us, where we slapped on IS-F 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 (ISF has base ignition maps, cam timing dependent ignition maps, knock correction maps)
• Intake and Exhaust variable cam maps
• Torque to throttle mapping (allows us to enhance throttle response)
• Rev limit increases to 7200 (for avoiding hitting the rev limiter)
• Raise the speed limiter

Our on road impressions are that the IS-F pulls much more smoothly and linearly, with excellent midrange and top-end improvement. This was evidenced in our ignition curve datalogs shown below where a combination of ignition and cam timing adjustments resulted in a much more linear and aggressive ignition curve, free of any detonation or large ignition corrections:

After extensive road dyno and datalogs, we headed over to top-notch climate controlled Dynojet testing facility and conducted many hours of dyno tests.



Please refer to our image gallery for dyno results comparisons. The chart below summarizes some of the gains for typical starting modifications on 93 (US) fuel.

Ordering Procedure

• 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 applicable to your car.

We recommend to read our technical tuning blog for more useful information about tuning.

Updates
If we make any version updates to this tune, we will make any such version updates available to our customer free of charge. With the OBD flashable device, we will email you an updated file.

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.

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?
We do not recommend any aftermarket intakes that remove the factory airbox. The only recommended intakes are intakes pipes like our RR-Racing Intake pipe, or equivalent.