How much extra horsepower and torque?

 

Be very careful. The ECU will show data related to the tune. If something does happen and the dealer checks before seeking authorization from Lexus to repair the issue you will be denied. It’s a low chance but still possible. I drove the TX350 and it was adequate power wise but the drove the 500H and immediately saw the difference and purchased it. Much more power and torque and 4-5 mpg better.

 

The JB4 website demonstrates with Map 2 you achieve 283 HP and 350 Torque. I ran Map 3 and it felt like a fast car. Always ran 91 Octane. Had it installed since 3000 miles on the odometer and had over 23,000 when we moved on. Never had one issue. I also had the Gruppe M intake. The power and induction sound was a whole new experience for this vehicle from stock.

 

Does not seem that much of an increase in hp and torque. The 500h comes in at 366 hp and over 400 in torque. Plus better gas mileage.

 

I was looking at the 2025 Sequoia I really liked it but my wife wanted a little smaller since we have 2022 Ram 1500, so we settled with 2025 500H

 

According to JB4, TX500H gains 75 hp. I bought it last month and planning on to install it this week.

 

That chart is hp measured to the wheels. The 500h has 366hp measure to the crank. JDM350TX stated they gained 40hp on map 2 with the JB4 on the TX350.

 

So how'd it go? Noticeable gains?