EDGE

Does anyone have any solid info on this, on clublexus.com in the GX section they are saying this is a 2005 hp bump with VVTI for the GX

JGage

crap, now I'm going to have to trade mine in.

EDGE

same here, is vvti something additional added to the engine or just an updated ecu, if they could reprogram the ecu then

JGage

Didn't someone on here dyno their stock '03 back in 2003 and the HP rated something like 26"x"hp and not the Toyota advertised 235 ?

I don't think I could get as good a deal as I did on mine, I'd probably just keep it and then add an SC... Probably make out better $$$$ wise.

I think it would be an engine and ecu change, but I'm not worldly about those sorts of things...

MTL_4runner

VVTI is variable valve timing which gives it the best of both worlds, both torque and HP! The engine camshaft is usually made with a combination of torque and HP in mind so a compromise of each is used to create the cam. With VVTI, the system varies the timing to give the best torque at low speed and then switches somewhere in between to a different setup which will maximize HP at higher RPMs. This is something they have been working on for a long time and I am glad to finally see Toyota making it part of the product line soon.

This might help to explain it a bit:
http://www.edmunds.com/news/innovati...9/article.html

EDGE

early on when the 4th gens just came out I remember some guy on edmunds saying he disconnected the front drive shaft and it dynoed at 260-270hp, he was a smart guy cause even before anyone new what X-Reas really was he knew it was made and designed by Yamaha I think he actually made that call before the truck even hit dealerships

I would doubt it is an all new engine, Toyota would not revamp the 4.7 when the 2nd Generation I-Force is just a year or 2 off, but like Acura with the MDX, every year they up the hp and the gas mileage gets better, thats all I want, wonder how the SC will work with the new updated hp.

don't read to much into the 270, this info is from a salesman or a lexus rep so who knows, all I know is most salespeople don't know what their selling till they see it anything they say is usually to make a sale

dcampen

It is a change in the mechanics of the engine, specifically the cam shaft so the the ECU can adjust the phasing of the valves according to engine rpm. I believe it is on the '04 4Runner V6 engine.
http://autozine.kyul.net/technical_s...gine/vvt_3.htm

bulldog-yota

I guess they could easily tap 270hp out of the V8, by just extending the RPM band and making some minor breathing changes. I doubt as EDGE stated that they would put VVT on the V8 now, to expensive to produce with a new and bigger V8 coming down the line to compete with Nissan, etc.

Would be great thought, as it will show how to get some extra reliable hopefully cheap HP out of the V8.

UNLESS they go back to the Lexus parts bin quickly and make the LS430 motor bigger??? Pretty much what they did with the LS400 motor to get the original 4.7 V8, now it just has more technology. If that is the case it will have some serious torque for the 4Runner.

SD4Runner

My 04 v6 has nice black cover which on the top it reads. VVT-i

GO V6, lol

bulldog-yota

Yep, the new V6, the V8 in the Lexus LS and some of the Corolla and Camry enigines, are the new generation engines with VVT. Sort of like BMW Vanos, VTEC Honda, etc.

The V8 in the 4Runner is still an older Gen, without VVT. It was derived from the old 4.0 V8 Lexus engine.

One day hopefully everybody will have Valvetronic like the BMW's.

BT17R

Toyota's VVT-i operates on the intake cam phasing only. Production cost is around USD$140 per engine. Yes, it distributes the fatter part of the torque curve to lower rpm's depending on continuously variable (not stepped) ECU orders. But, my understanding is that it was first an emission control device, second a performance enhancer. It was the first band-aid applied to the venerable 2JZ in the Supra and GS300 back around '97 to meet tightening emission regs.

The VVT-i flavors of most engines seem to get around a 5% bump in horsepower, little change in torque except for the shape of the curve, and entry into the ULEV club with lower emissions and usually better fuel economy. Pretty strange that the Edmunds article on VVT-i in the link above is wrong. The 2UZ pictured has never had VVT-i in any application.

A 30hp bump for the 2UZ sounds optimistic with only VVT-i. Maybe they added it to the exhaust cam or stroked it. I think it's at the bore limit now.

rimpainter.com

Dont forget about the VTC's in the 92+ Maxima's. Variable Timing Controllers on the 30VE provided a smiliar "boost" in HP in a slightly different way. It worked more off of timing than cam lobes. The timing would advance as the conditions for engagement occurred. Only problem is the dang things started to rattle and click after 120K miles or so. Just be glad you will never have to deal with that again - technology has improved vastly since then.