4.0 V6 Differences

I noticed the Horsepower Differences in the 4 Liter V-6 Toyota engines. I saw 235 HP in my 06 Tacoma and 265 HP in another Toyota 4WD FJ and now I hear there is a 270 HP 4.0 V6 coming out.

I wonder what exactly is the difference in the engines that give a higher HP rating. I may want some of that.

 

I think dual VVT-i

 

I wonder what the difference in gas mileage will be?

 

Look up a 2005 Tacoma 4.0.

 

The new 4 Runner 4.0 is rated at 17 city 22 highway. Those are the same numbers as my 2008 2.7L Tacoma.

 

They are 245hp and I think it's because they are rated with premium gas as that's what's required/suggested. I think that the later ones are rated with 87 gas and that's why they are less. I believe that the newer one would have the same power if premium is used. This is they theory I believe.

 

A few things of note.

1. The FJ Cruiser's current 260 hp / 271 lb-ft rating is on 91 octane, while the Taco's 236 hp / 266 lb-ft rating is on 87 octane. Put 91 octane and the ECU will advance ignition timing and achieve 239 hp / 278 lb-ft. So the Taco puts out more torque.

2. There was a change in SAE hp testing method in 2005 that caused a small drop in hp ratings across the board. If you find a 2005 Taco brochure, it may claim higher hp than the 2011 Taco.

 

I read it here:
http://en.wikipedia.org/wiki/Toyota_GR_engine#1GR-FE
Obviously not all engines automatically produce more power with premium fuel. The Taco's ECU is supposed to recognize premium fuel and adjust timings accordingly. Whether you can feel that extra bit of power by seat of the pants is debatable. I think dyno runs would be needed.

 

Im pretty sure the 270HP is due to the addition of Dual VVT-i.

Currently the tacoma doesnt have that, and i think the FJ doesnt have it either. Only the new 4Runner.

 

12 lb-ft is less than 5%. I don't think its noticeable by feel even if you ride two trucks back-to-back in identical temperature / wind / altitude.

 

5% is a noticeable improvement

 

Wikipedia is not a reliable source.

You have to look at the proof of where the information comes from. At the end of any information that is put on Wiki you need to look for the footnote and then go to that information to find out if it is bunk or not. If there is no footnote (proof of information) then the info is most likely bunk.

 

It is not reasonable for the horsepower to go up 3 and the torque to go up 12 without some change in the exhaust or intake.

Just changing the fuel usually results in relatively equal increases by percentage. For instance, in a diesel you may have 200hp and 400ft-lbs. If a more high performance fuel is used the increase would look like 10hp and 20ft-lbs (a 5% increase).

 

I read somewhere on the Taco Forum that the 2011 would have more HP and get redesigned. I looked on the Toyota web and it seems here are really no changes to the 2011 model. HP is listed as the same.

But I was just curious how they were obtaining the extra HP in the FJ with the same engine. I thought maybe they used different cams or exhaust or intake.

Thanks for the replies.

 

FJ and the new 4Runner get dual VVTi which adjusts the timing on both the exhaust and intake camshafts. The Tacoma only has VVTi which only adjusts the timing on the intake camshaft.