Pros & Cons on V8 with vvti or without
- Thread starter jnat306bg
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I don't know any cons and I'm surprised not to see any replies yet. All I can pitch in is that when they added VVTI, it bumped up the horses and the torque a bit. It was supposed to help gas mileage out as well. I don't think there are any major differences or that you have to do anymore maintenance than what you do now. For the 4runners, VVTI was added for the 2005 and above.
zopperman
Moderator
2004*
BlackWorksInc
New member
VVTi was added to the V8's in the 2005 model year. My '04 lacks VVTi
zopperman
Moderator
NJshadow93
New member
Going from a 2003 V8 to a 2006 V8 with VVT-i, I noticed the same gas mileage and a little more pep. Better acceleration from stop and better acceleration on the highway. In between though seems the same.
TFJ-4runner
New member
IIRC 2005 V8 had the most power out of any other years. VVT-i means more components with the potential to go wrong but I have never heard of a 2UZ failing because of it.
NJshadow93
New member
2005-2009 V8s are exactly the same, they just calculated power differently, getting different results later on.
Personally, I've never heard of any Toyota VVT-i system failing.
I doubt you'll here about a 2UZ failing because of it. EVER. It's just that good.
BlackWorksInc
New member
I haven't heard of a 4.7L failing due to a VVTi failing, but we do occasionally have an issue with cam phasers on the VVTi systems, I've seen them more on the I4's than the larger engines, but its not out of the question.
I've seen one V8 destroyed when the WP seized and broke the T-Belt (only instance of that I have seen or heard so far in my area.) and one guy overheated his Tundra bad coming up the Grapevine and toasted the engine.
I've seen one V8 destroyed when the WP seized and broke the T-Belt (only instance of that I have seen or heard so far in my area.) and one guy overheated his Tundra bad coming up the Grapevine and toasted the engine.
WXman
New member
MOST of the VVT engines of all brands have cam phaser problems eventually, most of them by 100K. How expensive/hard it is to repair depends on the engine. I personally haven't heard of Toyota failures but then again I'm new to the Toyota scene. But the laws of physics alone dictate that the 2005+ engines cannot be AS reliable as the older engines because they simply have far more parts that can fail.
As has already been said, 2003 and 2004 engines had a lot more torque on paper. The HP went up, but torque went down on paper when the 2005 models came out. I have never seen dyno results from stock engines to compare real world torque, but on paper the older engines are better truck engines because they make more torque.
NJshadow93
New member
They don't make more torque, the VVT-i has more horsepower and more torque. Like I said before, they changed the way power was calculated. Using the old method for both shows the non VVT-i at 320 lb/ft compared to 330 lb/ft with the VVT-i.
So, what are you looking at?
If you go to the '2005' page, you will see:
"5. 2UZ-FE Engine A VVT-i (Variable Valve Timing-intelligent) system has been newly adopted to improve fuel economy and engine performance, and..."
Joeggernaut
New member
I can tell you toyota's valvetrains are some of the most robust/simplest in the automotive market. They are not leaders in technology but they improve upon and simplify other manufactures technologies.
Example:
German manufacturers are known for their advance valvetrains but with dual cam phasing (dual vvti) and valve adjustment (Bmw valvetronic). Toyota just now is getting dual vvti and valvematic which is just a simplified version of these technologies.
Toyota has had single vvti since the 2000 celica. 5 years of improvements means the single vvti now in the v8 (2005+ 4runner) is robust.
Also the vvti systems are much simpler than direct injection or valvematic.
VVTi is able to improve engine efficiency but the main reason they add it is because of emissions. A bonus is improved hp/torque.
Example:
German manufacturers are known for their advance valvetrains but with dual cam phasing (dual vvti) and valve adjustment (Bmw valvetronic). Toyota just now is getting dual vvti and valvematic which is just a simplified version of these technologies.
Toyota has had single vvti since the 2000 celica. 5 years of improvements means the single vvti now in the v8 (2005+ 4runner) is robust.
Also the vvti systems are much simpler than direct injection or valvematic.
VVTi is able to improve engine efficiency but the main reason they add it is because of emissions. A bonus is improved hp/torque.
WXman
New member
That's why I said "on paper". It was very puzzling to people when the '05s came out and listed torque actually went way down.
zopperman
Moderator
whoops, i meant v6 was 04 v8 was 05.
TFJ-4runner
New member
I think the next dyno event I attend I'm going to have them run it. Ill report my findings back to everyone.
NJshadow93
New member
Even on paper, the torque and horsepower are still higher, that is until they changed their method of calculation.
2005 Toyota 4Runner Review | Edmunds.com
NJshadow93
New member
In my opinion, having owned both V8s, VVT-i shouldn't be a deal breaker. It adds a little more noticeable power, but the pre-VVT-i V8 is also very powerful. The VVT-i just adds a little more pep, I think the 0-60 time improved by less than half a second.
