Lalaapts

2005 hp is 290
2006 hp is 278

Or at least that the info i found. Any thought? I find it strange that the last model year they would decrease hp? Was it for mpg or smog? Same engine:/

Tom57

Government changed the method how horsepower is calculated after 2005 before 2006 model. It's the same engine in all respects.

Lalaapts

How do you expain the mpg on 06 is better?

Jks24

I do not know for certain but i am guessing that they tweaked the vvti and messed ith the fuel maps.

StanVanDam

The US EPA changed fuel efficiency test methods in 2008. Maybe they applied the new methodology to previous years.

Canada's NRC also revamped their test methods to be more accurate and more in line with US EPA.. but this didn't happen until 2015.

Tom57

I assume you mean the EPA rated / advertised MPG. Again, the method to test/calculate MPG was different in 2006. Rated horsepower went down in 2006, rated MPG went up. The actual MPG and horsepower for '05 & '06 LS is the same.

I have an '05 & '06. The 3UZ-FE engine is exactly the same in both. The MPG is the same. The horsepower is the same.

Lalaapts

hmmm thats news to me, thanks for the info.

lorenr

iTrader: (1)

Actually, it was about that time that the EPA started checking the accuracy of the manufacturers claimed horsepower ratings. Some including a few Toyota models (LS 430) had a little problem. They then had to put the true ratings on the motors.

The positive side of this is that some of the motors today are actually under rated so they don't run into the issue again. Ford had a joke of a rating on it's Cobra four valve engines and was sued for damages by the car owners. Lesson learned.

Insedanity

Is that a typo on the EPA thing? I can understand emissions but I can't imagine why the EPA would care about HP.


Yeah, the owners had every right to take action, I remember that. And then you had Dodge putting out the SRT-4 that was putting down more whp than the engine was rated for at the crank.