The new tundra comes out swinging with 381 horses

[E. Haskell]

I'd say that is probably close ~370hp+. The 4.7L makes 273hp so an extra 100hp with the new technology and 1.0L extra doesn't seem impossible -- especially with Toyota wanting to make a big splash in the truck market. With the GMT900s out, it's "go big or go home" for Toyota and I think they know this .

[SnapOversteer]

Originally Posted by SuperSS27

I highly doubt it will be a torque monster. DOHC motors aren't known for their torque.

??? What are you smokin? Toyota's DOHC, narrow valve angle V motors have almost always had extremely flat torque curves and big torque numbers compared to similar displacement engines.

Once again:


The red is baseline, the blue is supercharged. This is the 4.0L 1GR-FE V6 found in the Tacoma, 4Runner, Tundra, and FJ.

That's about 238 crank hp, and 285 crank torque under the new SAE specs, but look how flat the torque curve is. Expect it to be even smoother on the 5.7L V8 since it has dual VVT-i.

[paul8488]

I don't see why anyone is 'guessing' at the trucks hp. How can a random guess pulled directly out of our rear ends possibly be any more believable than a report by a journalist that clearly has more info than us on the truck?

[FordFan]

Come on Ford, the Hurricane must blow this **************** back to japan.

GM must put the 6.2 with the 400HP in the Silvarado and update the one in the Escalade to 430.

[SnapOversteer]

Originally Posted by rearden82

I know I'm setting myself up for some juvenile wisecracks, but here goes.. OHV vs DOHC is like blowing through a straw vs. a garden hose.

Blow gently, and the air will move faster and more forcefully thru the straw. Similarly, an OHV engine can fill the cylinders more rapidly at low RPM, which makes for better torque.

But if you're blowing as hard as you can, you won't be able to get nearly as much air through the straw as you can through the garden hose. Similarly, DOHC engines are better at high RPM.

Now if you could selectively put a straw-sized restrictor plate on the end of the hose, you'd get the best of both worlds. Modern DOHC engines use VVT and variable intake geometry to do just that.

Almost all OHV engines I've driven (except for the LS1) run out of steam past 4000 rpm. They feel like they have a lot of low-end power simply because they don't have any high-end power.

Most modern DOHC engines pull just as hard as an OHV engine at low revs. But you don't notice it as much, because they have top-end power too. I don't expect the new Toyota to have any problems with torque.

It has more to do with intake velocity, port design, valve size, and cam duration rather than OHV vs OHC. Either engine type can make tons of low-end with no top end, or tons of top-end with no low-end. Both have been proven in racing. NASCAR's OHV engines rev to over 9000rpm on some tracks. The torque has fallen off considerably after its 8000rpm peak power, but since you get a good tow (draft in NASCAR terms) from the car in front of you, you cut the aero drag considerably and move forward by way of momentum.

By far the most important aspect of either engine is its cams. Most trucks use super conservative cams, so the valve duration is shortened quite a bit in comparison to most passenger car engines. Take any OHV engine, put a hot cam in it, increase the valve size by 1-2mm, and you'll see it too can create top end power.

The great thing about VVT-i and dual VVT-i is it varies the cams through hydraulic actuation. By changing the valve timing on both the intake and exhaust cams in both heads of a V6 or V8, you can create excellent volumetric efficiency, which results in more net power throughout the rev range. Toyota combines dual VVT-i with a variable two stage intake manifold which switches between short and long runners. Long runners are used to keep low-mid range torque at low RPMs, and short runners are for high RPM use.

The more air an engine can suck, the more power it can create. DOHC heads are by far the least restrictive in terms of that.

[uboys]

Originally Posted by Mags

I sense a lot of paranoia in this thread.

MF

So do I.
I warned people not to dismiss Toyota out-of-hand.
Many people scoffed.

We will see what transpires.

[Sundown]

FYI.......
2007 Sierra 900
Sierra 1500
GMC Sierra 1500
Performance Specifications
Base Engine 5.3L OHV V8
Horsepower @ rpm 315 @ 5200
Torque (lb.-ft.) @ rpm 338 @ 4400
Available Engine 6.0L OHV V8
Horsepower @ rpm 367 @ 5500
Torque (lb.-ft.) @ rpm 375
Std. Transmission 4-speed auto.Opt. Transmission — — 5-speed auto.

[hdmax]

Originally Posted by Mags

I sense a lot of paranoia in this thread.

MF

Right now, these numbers are as reliable as James' huge numbers for the GMT-900. And we all know how that panned out.

Anyone remember that he said the 6.0L would be 400/400? Well that was not even close. So I for one will take the wait and see approch.

[IROCNROL1]

Originally Posted by Mags

I sense a lot of paranoia in this thread.

MF

With justification though, it appears. BTW your post almost got lost in your signature.

[IROCNROL1]

The big surprise to me is that GM can even stay close with their low tech approach. While I commend them for that, it's time to break out the drill and order some more valves and pushrods. At least.

Pushrod engines have their advantages, price, size, less complex, maybe even mileage, but if Toyota can build a vehicle for a couple of grand less and then put the money into the engine, that advantage basically disappears.

[andy82471]

http://www.msnbc.msn.com/id/15319160/from/RS.5/


Indiana-born rock star John Mellencamp may not be the first person that springs to mind when it comes to pickup trucks, but with sales slipping, automakers are painting themselves red, white and blue to capture customers in America¡¯s heartland.
General Motors has hired Mellencamp to record a patriotic tune called ¡°Our Country¡± for its Chevy Silverado television commercials. ¡°This is our country; this is our truck,¡± a narrator says in the commercial.
The strategy may seem tacky, but it¡¯s part of a big battle brewing in the automotive business over pickup sales, which are down from 10 to 15 percent this year for the Big Three automakers. And ground zero for that battle is America¡¯s heartland.
Story continues below ¡ý advertisement ad_dap(250,300,'&PG=NBCMSB&AP=1089');


Ford and GM¡¯s Chevy division dominate U.S. truck sales, but now Japan¡¯s Toyota is aiming to muscle its way into the American market with its 2007 Tundra truck. The full-size pickup, which was introduced in 1999 and will be relaunched soon with an all-new version, goes up against Chevy¡¯s Silverado, the Dodge Ram and Ford¡¯s F-Series pickup, long the country¡¯s best-selling vehicle and Ford¡¯s bread-and-butter product.
Toyota wants to convince American truck drivers to trade in their U.S.-made vehicles for Japanese Tundras, but with an American twist. The company is preparing to move production of the Tundra to a new plant in Texas, the nation¡¯s biggest pickup market, where one of every four vehicles sold is a pickup, compared with one in every eight elsewhere in the United States.
¡°Toyota has been expanding by building more plants in North America ¡ª they put them in areas where they want to increase their business,¡± said George Magliano, director of automotive industry research at Global Insight. ¡°The idea is truck buyers become more loyal to a manufacturer that brings jobs and money into their state."
The truck segment is a missing piece in Toyota¡¯s product line-up, which focuses on sedans and also includes smaller crossover vehicles. Toyota is looking to grow and break into new vehicle markets, said Magliano. The American pickup market, which has largely been the domain of the Big Three until now, is very lucrative and a tough one to crack, he added.
¡°One strength Toyota has is its ability to stick with a strategy,¡± said Magliano. ¡°They got into the truck market about 10 years ago, and they didn¡¯t have much success right away, but they just kept working at it. They keep on improving a product, and they eventually crack the market and that is how they are gaining market share in the United States.¡±
Indeed, the new 2007 Tundra is much larger and more powerful than its predecessor, with a 5.7-liter, 381-horsepower V-8 engine, compared with the old 271 horses. Trucks start rolling off the San Antonio assembly line next month and hit the showrooms early next year.
GM and Ford are not taking Toyota¡¯s assault on their turf lying down. At last month¡¯s State Fair of Texas, Ford showed off its latest F-Series pickups, while GM unveiled a redesigned Silverado and the GMC Sierra HD. The Silverado is the No. 2 seller, but sales are down 15 percent from last year, according to research by Autodata, which tracks the industry.
It is no mistake that all the players chose to focus heavy marketing efforts on the Texas fair.
¡°[Texas] is ground zero for truck leadership,¡± Mark Fields, Ford¡¯s president of the Americas told The Associated Press. ¡°If you don¡¯t show up in Texas, particularly at a venue like the state fair, you might as well not show up at all. This is where you duke it out. It¡¯s where you make your bones as far as burnishing truck production.¡±
Toyota¡¯s Tundra play is part of a broader strategy to win over middle America. Earlier this year Toyota announced it plans to become the first foreign manufacturer since the 1950s to supply cars for NASCAR¡¯s top series, entering a Camry ¡ª the nation¡¯s best-selling car ¡ª in the NASCAR Nextel Cup and Busch series in 2007.

[andy82471]

So what do you guys think ? Is this the real deal ?

[likearock00]

Originally Posted by andy82471

So what do you guys think ? Is this the real deal

This has been out all week.

[AndrewGS]

Originally Posted by CACressida

Does a Chevy Silverado get impressive gas mileage when towing a boat? Thanks, cuz I thought buying a full size truck was to do full size work

If you guys seriously think Toyota can't get anywhere near 380 horsies in the 5.7L, then you guys must be on crack. Everyone knows that Toyota has been fed up with being called 7/8ths a truck, not powerful enough, not tough enough. Do you think Toyotas next attempt at the full size market with the next genration Tundra is gonna be like the past?

What is the power ratings of the base V8s in the competition? Lets check:

Toyota Website:
4.7L V8 271 hp @ 5,400 rpm 313 lb.-ft. @ 3400 rpm

GM Website:
4.8L V8 285 hp @ 5,200rpm 295 lbs ft @ 4000rpm

Ford Website:
4.6L V8 248 hp @ 4,750rpm 294 lbs ft @ 4000rpm

Dodge Website:
4.7L V8 235 hp 300 lbs ft

Average engine size, yet Toyota's base and only V8 gets better torque than all of them. Makes better hp than the rest next to the Chevys base V8. What makes you think Toyotas 5.7L won't do the same to it's peers?

The 4.7L iForce is currently the only V8 in Toyota's trucks, so it's also Toyota's top V8. The popular V8-equipped GM trucks that compete with the popular V8-equipped Toyota trucks (Extended/Access Cabs, Crew/Double Cabs) are usually 5.3L-equipped.

[KROM]

Even if it had 600HP, it is still ugly.

I can't wait to see how it sells though.