fake_usa

Anyone see this on Edmunds.com?
Tundra has a lot more power then I was expecting.
It pretty much spanked the 6.0
Front page has a video: http://www.edmunds.com/insideline/do.../pageId=118239

Specifications and Performance

2007 Toyota Tundra
Vehicle Type:
Model Year: 2007
Make: Toyota
Model: Tundra
Style: Tundra Double Cab Limited 4WD (5.7L V8 6A)
Base Price: N/A
Price as Tested: N/A
Drive Type: Part-time 4x4 with low-speed transfer case
Transmission Type: 6-speed automatic with manual mode and tow/haul switch
Displacement (liters): 5.7 liters
Engine Type: V8, aluminum block and heads
Horsepower (hp @ rpm): 381 @ 5,600
Torque (ft-lb @ rpm): 401 @ 3,600
Braking System: Front: 13.9-inch ventilated disc
Steering System: Hydraulic power-assisted rack-and-pinion
Suspension Type (front): Double wishbones, coil springs, monotube shock absorbers, tubular stabilizer bar
Suspension Type (rear): Leaf srings, staggered monotube shock absorbers
Tire Size (front): P275/65R18
Tire Size (rear): P275/65R18
Tire Brand: BFGoodrich
Tire Model: Rugged Trail T/A
Curb Weight (lbs.): 5,637 (as-tested)
Recommended Fuel: 87 octane regular unleaded
Fuel Tank Capacity (gal): 26.4
EPA Fuel Economy (mpg): 14 city/18 highway
Edmunds Observed (mpg): 14.4

Performance:
0 - 30 (sec): 2.2
0 - 45 (sec): 4.1
0 - 60 (sec): 6.3
0 - 75 (sec): 9.4
1/4 Mile (sec @ mph): 14.8 @ 93.7
30 - 0 (ft): 32
60 - 0 (ft): 131
Braking Rating: Good
Slalom (mph): 54.9
Skid Pad (g-force): 0.69
Handling Rating: Good
Db @ Idle: 45
Db @ Full Throttle: 76.6
Db @ 70 mph Cruise: 65.6

Acceleration Comments:
All the best runs were made with traction control off*, but with prudent throttle modulation to keep the rear tires from evaporating. Wow, this thing is quick!*Note: Turning traction control off automatically engages Auto LSD, an electronic limited slip function.

Handling Comments:
Our test truck had no owner's manual, and we didn't find the defeat mechanism for the stability control while at the track. Therefore, our slalom results came in lower than they otherwise would have. Nevertheless, steering is quick and precise, and the chassis is suited to dancing. Unlike in the slalom where stability control was the limiting factor, the tires were limiting on the skid pad. An inexorable "push" develops that doesn't seem to awaken the sleeping electronic nanny.

Specifications:
Length: 228.7 in
Width: 79.9 in
Height: 76.4 in
Wheelbase: 145.7 in
Legroom (front): 42.5 in
Legroom (rear): 34.7 in
Headroom (front): 40.2 in
Headroom (rear): 38.7 in
Maximum Seating Capacity: 5
Cargo Volume: N/A
Maximum Cargo Volume (rear seats down): N/A
____________________________

2007 Chevrolet Silverado
Vehicle Type:
Model Year: 2007
Make: Chevrolet
Model: Silverado 1500
Style: LT2 4dr Crew Cab 4WD 5.8 ft. SB
Base Price: $35,840
Price as Tested: $41,919
Drive Type: Four-wheel drive
Transmission Type: 4-speed automatic
Displacement (liters): 6.0 liters (5,967 cc)
Engine Type: V8
Horsepower (hp @ rpm): 367 hp @ 5500 rpm
Torque (ft-lb @ rpm): 375 lbs-ft@ 4300 rpm
Braking System: Front ventilated disc - rear ventilated disc
Steering System: Power-assisted rack-and-pinion steering
Suspension Type (front): Independent double wishbones, coil springs
Suspension Type (rear): Solid axle, leaf springs
Tire Size (front): P265/70R17 113S
Tire Size (rear): P265/70R17 113S
Tire Brand: Goodyear
Tire Model: Wrangler AT/S
Curb Weight (lbs.): 5,371 (5,457 as tested)
Recommended Fuel: 87 octane regular unleaded
Fuel Tank Capacity (gal): 26
EPA Fuel Economy (mpg): 15 city / 19 highway
Edmunds Observed (mpg): 12.7

Performance:
0 - 30 (sec): 2.6
0 - 45 (sec): 4.5
0 - 60 (sec): 7.2
0 - 75 (sec): 10.3
1/4 Mile (sec @ mph): 15.5 @ 88.1
30 - 0 (ft): 32
60 - 0 (ft): 139
Braking Rating: Good
Slalom (mph): 57
Skid Pad (g-force): 0.69
Handling Rating: Good
Db @ Idle: 46.3
Db @ Full Throttle: 74.7
Db @ 70 mph Cruise: 66

Acceleration Comments:
With traction control turned off, spinning or not spinning the rear tires didn't much affect the acceleration numbers. There's no indicated redline, but upshifts generally occur at 5,500 rpm. Wide gear spacing revealed a couple dead-spots in the 6.0L V8's power band.

Handling Comments:
On the skid pad, with the stability system disabled, the Silverado gets into tire sidewall flex frequency that causes the truck's front tires to bounce and the whole truck to porpoise. As a result, the truck eventually begins to understeer.

Specifications:
Length: 229.9 in
Width: 79.9 in
Height: 73.7 in
Wheelbase: 143.5 in
Legroom (front): 41.3 in
Legroom (rear): 38.7 in
Headroom (front): 41.5 in
Headroom (rear): 40.6 in
Maximum Seating Capacity: 5
Cargo Volume: 53.2
Maximum Cargo Volume (rear seats down): N/A
____________________________

2007 Nissan Titan
Vehicle Type:
Model Year: 2007
Make: Nissan
Model: Titan
Style: SE 4dr Crew Cab 4WD SB (5.6L 8cyl 5A)
Base Price: $32,285
Price as Tested: $37,155
Drive Type: Four-wheel drive
Transmission Type: 5-speed automatic
Displacement (liters): 5.6 liters (5,552 cc)
Engine Type: V8
Horsepower (hp @ rpm): 317 @ 5200
Torque (ft-lb @ rpm): 385 @ 3400
Braking System: Front ventilated disc - rear disc
Steering System: Speed-proportional power-assist rack-and-pinion steering
Suspension Type (front): Independent, double wishbones, coil springs and stabilizer bar
Suspension Type (rear): Solid axle, leaf springs
Tire Size (front): P285/70R17 117T
Tire Size (rear): P285/70R17 117T
Tire Brand: BFGoodrich
Tire Model: Rugged Trail T/A
Curb Weight (lbs.): 5,199 (5,398 as-tested)
Recommended Fuel: 87 octane regular unleaded
Fuel Tank Capacity (gal): 28
EPA Fuel Economy (mpg): 13 city / 18 highway
Edmunds Observed (mpg): 13.7

Performance:
0 - 30 (sec): 2.3
0 - 45 (sec): 4.2
0 - 60 (sec): 6.7
0 - 75 (sec): 10.4
1/4 Mile (sec @ mph): 15.3 @ 89.0
30 - 0 (ft): 31
60 - 0 (ft): 127
Braking Rating: Excellent
Slalom (mph): 56.7
Skid Pad (g-force): 0.69
Handling Rating: Good
Db @ Idle: 49.4
Db @ Full Throttle: 74.5
Db @ 70 mph Cruise: 66.7

Acceleration Comments:
The Titan is difficult to launch aggressively because of the open rear differential. It tends to be a "one-legger" when wheelspin occurs. Shifts are crisp and right at redline. Wonderful-sounding engine.

Handling Comments:
The open differential won't allow the Titan to circle the skid pad any faster. When the inside-rear tire gets light, the outside-rear wheel loses power and that's that. In the slalom, the Titan really feels much sportier than most pickups. Steering is direct, well weighted, and the chassis will respond to some "slideways" antics without much protest. The raw mph figure doesn't reflect how capable and confident the Titan feels here.

Specifications:
Length: 224.2 in
Width: 78.8 in
Height: 76.7 in
Wheelbase: 139.8 in
Legroom (front): 41.8 in
Legroom (rear): 40.4 in
Headroom (front): 41.0 in
Headroom (rear): 40.4 in
Maximum Seating Capacity: 6
Cargo Volume: N/A
Maximum Cargo Volume (rear seats down): N/A


____________________________



Power struggle
Not on paper. Equipped with the optional pushrod 6.0-liter L76 V8 rated at 367 horsepower and 375 pound-feet, our Silverado is packing a full 50 hp more than the quicker Titan. Sure, the Chevy's automatic transmission has only four speeds to the Nissan's five, but 50 hp is 50 hp. Were the Silverado's ponies asleep, or were Nissan's horses on steroids, or both?
To shed some light on whether any of the claimed power ratings are sandbagged or inflated, we put all three trucks on MD Automotive's Dynojet chassis dyno in Westminster, California.
Full power in 4... 3... 2... 1...
Of the three trucks we tested on the dyno, only the Silverado produced inconsistent results that appeared curiously low across nearly the entire rev range. Most unexpected was a power spike just before redline.
Although the spike resulted in a peak of 297 hp at the wheels — about right for the rated 367 hp at the flywheel, once drivetrain loss is factored in — the Silverado's measured power appeared to be underachieving everywhere else in the rev range.
In fact, the Chevy produces significantly less power than the Titan for the duration of the dyno test until the Chevy finally surpasses the Titan's peak of 291 hp at the wheels.
As it turns out, the explanation boils down to an engine calibration strategy. GM calibrated the 367-hp 6.0-liter V8 to remain in stoichiometric "closed-loop" fuel delivery mode for 4 seconds after the throttle is floored. This fueling strategy helps keep emissions in check (and saves fuel) at the expense of reduced power — about 40 hp less at the peak. Once the driver lifts his right foot from the wide-open throttle position, the 4-second clock resets.
This explains why the Silverado's power is low everywhere on the graph right up to the jump in power right before redline. Corresponding to the expiration of the 4-second window, the jump in power is indicative of the engine switching to open-loop "power enrichment" mode. It is only when operating in this mode that the engine delivers its full rated power.

truckmann

iTrader: (8)

Looks like just a better transmission (ie. 6 speed) for the Chevy would help it out a lot, but hell everyone knows that already except GM that is.

KevinF56

iTrader: (9)

wow. interesting comparison.

mcfarlnd

iTrader: (15)

thanks for the info

nonnieselman

iTrader: (10)

Is this TRUE??
That just sounds stupid... so there is no point in puttin it to the floor? Ive got to find someone and get the stock tune to look at it..... Thats just odd.

64 comet afx

I thought that the 6.0ltr was suppose to have variable valve timing. If so I think that chevy misunderstood the whole concept of it. Its suppose to allow you to retain bottom end power as well as high end!

Leroy_454

Interesting. I just picked up an 07 silverado with a 5.3 today. Looks like some tuning maybe in line to get these trucks to where they need to be. I'm pretty impressed with the part throttle on my truck, but I haven't opened it up on the top end yet. When I get a few miles on I will report back with stock Gtech Pro results.

fake_usa

GM better step it up quick and give buyers the option to put the Escalade's Gen IV 6.2L Vortec V8 VVT in our pickups. The engine specs are 403 hp @ 5,700 rpm / 417 lb-ft @ 4,300 rpm and would have no problem spanking that ******* Tundra.

5.3AlmnBlk

the tundra in comparasion still short 400 lbs in payload and 400 in towing. It also has a 6 speed with 4.30 gearing wich is crazy tall the titan has a 5 speend and a 3.30 and its like a 4.10 in a 4 speed

PSM

iTrader: (3)

you guys are missing the point... what moves a heavy *** truck... tq.. and where does the tundra make it's tq.. down low... yet it has vvt to cary its power band. Just putting the 6.2 won't mean its gonna spank the tundra... you still have to deal with the fact that the iForce 5.7 is a tq monster and thats what makes it move