OK, the 3.5 should be a good engine

You seem to be putting GM in the same class as Honda and Toyota at making high RPM , durable motors. Seriously ?

 

Just check the specification of the gs450h 3.5l atkinson d4s engine.
This is probably the engine that will be in the 2016 tacoma.

the spec: 286 hp @ 6,000 rpm; 254 lb ft @ 4,600 rpm

 

It had better get 35 mpg with a drop in torque and a useless hp rating at 6k.

 

Useless? Let's do the math. We'll even assume premium gas on the 4.0L.

Yes the 4.0 is good for midrange torque with 278 lb-ft at 3700 rpm. Look at the peak power though; 239 hp at 5200 rpm is 241 lb-ft. Thats a substantial loss by then and it only goes downhill from there. Plus, on the automatic, you'll only get that big torque number early in the gear.

Then look at the 3.5L quoted above. 254 lb-ft at 4600 rpm should be about as much torque as the 4.0L at the same rpm. However, 286 hp at 6000 rpm is 250 lb-ft. Only a loss of 4 lb-ft. That is a SUPER flat torque curve. With the proper gearing, the new engine would outperform the current one in virtually every situation.

I'd drive it.

 

you realize those numbers above arnt going to be anywhere close.... that motor is atkinson only and is not tuned for a truck application.

it isnt even the same motor.

 

The motor switches to the atkinson cycle on low load situations, just like the Hemi turns off half the cylinders to save gas, GM does this as well. This system saves gas and doesn't have the problems associated with cylinder deactivation.
The new Truck will outperform the current one while using less gas.

 

The 2GR 3.5L made 280 hp on port injection in 2004, why would we expect any less on d2s, so the argument is valid

 

Linkage?

Not saying you're wrong - I haven't been following that closely. I did have it in my head that this was going to be atkinson via variable valve timing, AKA half and half BS. I thought everything thing was inuendo and rumor at this point, would appreciate anything solid you've got.

David

 

im pretty sure in the press release of the truck they said atkinson and otto cycle.

 

I know the video linked from the Toyota website says it has both direct and port injection implying atkinson/otto cycles via vvt...

David

 

http://toyotanews.pressroom.toyota.com/releases/2015+naias+2016+toyota+tacoma+dominates.htm

David

 

http://news.pickuptrucks.com/2015/01/how-it-works-2016-toyota-tacomas-atkinson-cycle.html
some more info.

 

suppose it has both... would their be a way to tune out the shitty Atkinson cycle?

 

but if it had both, culd you? I know many chevy guys tune out cylinder deactivation

 

I referenced as per the direct and port fuel injection - you belive this is an Atkinson only engine with part time port injection?????

I was not under the impression that the prius engine was not a true atkinson cycle - merely a direct injected VVT otto cycle.

The implication for having both methods of induction indicates atkinson/otto cycle via vvt for the Tacoma.

Do you believe that Toyota has actually developed a true atkinson cycle engine and introduced it in the Tacoma? I find that difficult to believe....

David

 

If they did develop a true atkinson cycle engine then It would have made news... It is just a faux atkinson cycle engine that uses timing to control the fuel mixture better.

 

so would the new Tacoma be boost-able?

 

I don't think you know what a true Atkinson cycle engine is....

David

 

http://news.pickuptrucks.com/2015/01/how-it-works-2016-toyota-tacomas-atkinson-cycle.html

 

People turn off the GM system because like so many GM products it wasn't fully engineered and tested before they brought it to the market and had many problems. This system has been used by Toyota since 1997, you shouldn't need to disable it.