i noticed that the 2005 tacoma 2.7L configuration has about 15 more ponies than previous years (164hp@5200rpm versus 150@4800; 183 lb-ft@3800rpm versus 177@4000). that is actually significant. the only other tidbit that i picked up on the toyota site was that it has VVTi - i dont know what that is exactly, can it account for the boost in performance?

edmunds.com calls the 2005 2.7L "all-new"... as in a completely new block? or are they just mis-using jargon? anyone know anything about this? just curious. tanks in advance-bk

 

They gave the mice more Wheaties.

 

VVTi is variable valve timing...not sure exactly how it works, but it allows the computer to control the duration the valves are open and thus increase power.

 

I'd suspect VVTI is the reason the newer 2.7 has just a bit more oomf. How often you reach 5200rpm's though? Makes me wonder why the TQ rating is higher at a lower RPM though. Different flywheel?

What changes where made to the block of internal components, I have no clue but am very interesed to find out just what exactly changed.

Good post.

 

VVTi will account for increased TQ at a lower RPM.

Compare the compression and intake and exhaust systems...I bet those are different too.

 

I'll bet anything that they made the exhaust a little more "free flowing".

I'm going to go check an '05 today. I'll look to see if the intake is any different than the one on my '96..

 

TOYOTA VVTI = Honda VTEC.

Simple as that. Variable valve timing ownes!

 

It's VTEC, not V-tech. Sorry, big pet peeve of mine.

 

ha. thanks!

 

 

Engine swap anybody?

 

Its got me thinkin'!

 

To the 2.7?

 

Honda's VTEC and Toyota's VVT-I are not the same. If I remember right Honda changes the cam timing so when you hit VTEC the cam rides on a different part of the lobes on the cam shaft. Toyota's VVT-I advances and retards the timing up to 30 degrees by adjusting the valve timing electronically. I don't remember exactly how it works but there are websites that tell you what the differences are. But I do know that there is a difference between the both. I mean the concept is the same to adjust the valve timing on the fly but the both do it a different way.

This is not set in stone on my part I did some research before on this and this is what I found that I can remember. If anyone else has more info that would help alot.

BIGMOOI

 

>"To the 2.7?"<<

2.7L (distributor model, like mine) to a 2.7L VVT-i (coil on plug model) would be the bee-omb!!

 

i think it's going to be the death of being able to rebuild your own engine in my view...

 

Ummm...maybe. I dont think I would want to do one, haha...

But there a few ways to do VVT, a soleniod, for example.

 

I'm sure the VVT-i is the exact, main, reason the 2.7 for 2005 has more power than the 2.7 from the 96-04 years. VVT-i typically doens't see huge PEAK (note the emphasis on this, PEAK) torque gains, but will see noticeable or reasonable horsepower gains. In this case nearly 10 percent increase for horsepower (from 150-164, 14 HP, nearly 10 percent), and only an increase of peak torque from 177 to 183, which is maybe 2-3-4 percentish?. But, and I stress the But, the VVT-i is good for torque in the sense that it will flatten out your torque band meaning your peak torque might not be all that much higher, but you should see more torque available accross your RPM band (or power band as some call it).

Torque is usually more related to displacement (IE engine liters) so you typically dont' see huge peak increases with VVT-i. But as mentioned, VVT-i does work for flattening this torque curve.

Someone may have already explained this in a previous thread somewhere, but Vtec is supposedly more related to Toyota's VVTL-i (Variable Valve Timing with Lift and Intelligence). Toyota uses VVTL-i on the 180 HP 1.8 Liter GTS engine on the Celica and now the Corolla XRS. Essentially the "lift" is a switch in cams' when the engine approaches the higher RPM band. This is where the High RPM cam comes into it's own and pushes the engine to 180 HP. The differences between Vtec and VVTL-i is the Toyota uses hydrualics for the switch in cams (from low/mid cams to high rpm cam), where I think Honda uses either pneumatics or electronics (not sure, or maybe something else). But as mentioned already, Torque being more related to displacement, VVTL-i, nor VVT-i, nor Vtec, are good for horsepower but don't do much for increasing peak torque.

I bet that 2.7 liter with VVT-i is a sweet engine. I'm kinda pissed they don't offer the 4x4 access cab with the 4 cylinder in Canada. At least not for the '05 model year.

 

To a 4.7............

 

right