http://www.gminsidenews.com/forums/s...threadid=16182

WOW... were are they getting that torque from

Glad to see they are not dropping the 4.8L, I'd still like to see that go into a Colorado.

I'm guessing the 5.3L is just getting the Vortec4000/LS2 setup.

4.2L = 290HP/300tq
4.8L = 300HP/335tq
5.3L = 355HP/380tq
6.0L = 400HP/400tq

 

Vortec 6000 will put out 435 HP and 440 lb/ft of torque.
The 8.1 will return with 375 HP and 480 lb/ft of torque.
Duramax 6600 will have 345HP and an earth shattering 630lb/ft.

Does anyone else think that the 8.1L is completely unnecessary? For a measly 40 lb/ft of torque increase over Vortec 6000, what else does it offer? It has 60HP LESS!!! And its fuel economy is probably much less.

 

8.1L should be replaced by a 6.3L or 6.6L small block. Save the 8.1L for Boat use.

 

Some really impressive numbers. The 5.3 being the biggest surprise.

 

I'd be interested in seeing what the whole torque curve looks like. Peaks don't mean much to me.

Thankfully, the weak I5 isn't going to see use in the GMT900s. I'm totally disappointed with that engine.

 

That I-6 motor is going to be the real winner IMO. Better fuel economy and V8 power(almost as much power as the 5.4 Ford V8)

 

everyone I've talked to has gotten lowsy fuel economy with the I6. Like 15 and 16mph. I get that or better in my '98 Z71 5.7

TONY

 

It gets 5/6th the performance of the I6 I6 has class leading power and the I5 has class leading fuel economy

I wonder how V8 Rainiers do, they are SWB. DoD V8's are EPA rated better than the I6 and every other V6 on the SUV market

I got 21mpg and 21.4mpg on the last 2 tanks in My Colorado. I5 =

 

I recently talked to a customer that had colorado with an I-5 about what kind of gas mileage he got. He said 17mpg which was worse than his 2wd 1500 4.8. He wasn't real happy about that. He said that he put a tonneu (sp?) cover on it to help mpg too.

TONY

 

Holy crap

 

It feels like 3/5th the power, even in the GMT355. I certainly would want nothing to do with that motor in a full-size truck.

 

My wife and I have an 03 Envoy XL with the I6. It definately struggles a bit on the bottom end but has a great top end pull.
But honestly, we have been very happy with our fuel economy.
Average 17-18 in the city and about 25-27 on the hwy. Considering this is the big version of this thing, I didn't think that was too bad.

 

Some of these numbers sound a little off to me, but things can and do change I suppose.

 

anyone else thing that the 435HP and 440lb/ft of torque 6.0L is were we will see the Vette at come 2007. That would give room for a 400HP LS2 Camaro.

Or it would be cool to see the Z51 get that 435HP engine.

 

I also got 17mpg, when I first got my truck. After about 500mi Ive gotten 20-21mpg ever since.
Also, Ive raced my friend with an 05 Dakota with the V8 and we stayed neck and neck from a 20mph roll up to 70 when we shut it down. I actually edged on him a little. That little I5 can hold its own I do agree though that it would suck in a fullsize.

Those output increases are awsome. I also think that we dont need the 4.8 or 8.1.