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Vortec 8100 question

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Yeah, if you get the manual transmission you don't have to pay the "thousand dollar gas guzzler tax".


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I wonder if anyone has ever tried to sue the gov't for double-taxation over that tax? If I follow the logic correctly, you pay THAT tax to buy a vehicle that will then have to pay "extra" tax in the form of gasloine taxes on the gas that it guzzles? /forums/images/graemlins/wink.gif
 
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Yeah, if you get the manual transmission you don't have to pay the "thousand dollar gas guzzler tax".

But yeah, the 8.1L impresses me. The 6.0L everyone gets in their 2500HDs is a girly motor. I can blow the doors off my Aunt's 2003 2500HD extended cab shortbox with my "little" 305. I get better gas mileage as well...

It's funny how my uncle has an identical 2500HD and he gets better gas mileage with the 8.1L.

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You would need a pretty strong 305 to "blow the doors off" a 6.0L........maybe your aunt isn't even trying to race you /forums/images/graemlins/whistling.gif
 
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Yeah, if you get the manual transmission you don't have to pay the "thousand dollar gas guzzler tax".

But yeah, the 8.1L impresses me. The 6.0L everyone gets in their 2500HDs is a girly motor. I can blow the doors off my Aunt's 2003 2500HD extended cab shortbox with my "little" 305. I get better gas mileage as well...

It's funny how my uncle has an identical 2500HD and he gets better gas mileage with the 8.1L.

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You would need a pretty strong 305 to "blow the doors off" a 6.0L........maybe your aunt isn't even trying to race you /forums/images/graemlins/whistling.gif

[/ QUOTE ] Um, yeah the new vortec motors haul ass! I doubt a 305 would even have a chance.
 
I must say the new Vortecs definetally haul ass. Your aunt is driving it man, you are trying hard she is probably giving it 1/2 throttle and thinking thats hard. As for the gas mileage of new trucks, don't get me started. Isn't technology suppossed to be making things better? Sure we make more power from the factory but gas mileage is still low teens whats that? You telling me an LS1 Camaro can get 20 some MPG and the weight of a truck makes it so you can't?
 
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You would need a pretty strong 305 to "blow the doors off" a 6.0L........maybe your aunt isn't even trying to race you /forums/images/graemlins/whistling.gif

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Which is going to be faster... a 5000lb Honda Civic or a 2500lb Honda Civic?

2500HD extended cab longbox = 5500lbs of girth
My truck = 4000lbs of girth on a heavy day

6.0L = 300hp at the crank
My truck = 190hp@5600 at the asphalt

Let's be overly optimistic and say that magically 240hp of that 6.0L makes it to the ground through the 4L80E.

5500lbs/240hp = 22.9 lbs/hp
4000lbs/190hp = 21.1 lbs/hp

I know my truck weighs 4000lbs on a heavy day because I've put it on scales. I'm guessing 5500lbs for my Aunt's truck based off GM's curb weight. Curb weight usually includes the bare necessities such as 1/4 tank of gasoline. It doesn't include the 5th wheel hitch that stays in the back of my Aunt's truck, the bedmat, the tonneau cover, the crap she's got in the cab with her, or the weight-distributing hitch they put on the back. The truck probably weighs more than 6000lbs.

We'll also pretend that the 4L80E doesn't have that horrible first gear (2.48) compared to my 3.06.

PS: I don't think anyone can get more horsepower out of a 305 than what I'm doing without aftermarket heads.
 
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You telling me an LS1 Camaro can get 20 some MPG and the weight of a truck makes it so you can't?


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It's not the weight so much as the aerodynamics. The Camaro is like an arrow slicing through the wind. A truck is more like a small barn... /forums/images/graemlins/eek.gif
 
yeah I guess tahts quite true, some reason that didn't register when I posted that.
 
Where did you get only 300 HP for the 6.0L? /forums/images/graemlins/yikes.gif Everything I've seen and read puts these badboys at 370 HP and like 360 TQ. I have drivin my mom's 2003 crewcab longbed 4x4 2500HD w/ 6.0L and 4L80E and that truck SCOOTS /forums/images/graemlins/woot.gif. I have also drivin our family 86 305 equiped K5 and even with a manual, it SUCKED. Right now I also have a 80 K10 with a manual and fairly fresh 350 and still, not even close. My burban is a little more or a beast after the 4.56 gears, I think my quarter mile might be down into the teens by now /forums/images/graemlins/whistling.gif, but still no comparison. Sure there is a weight difference but there is also a HUGE horsepower difference, you cant beat more power /forums/images/graemlins/waytogo.gif.

Getting back on subject, go with the 8.1L, I know a few people with them and not a single complaint, they all love them /forums/images/graemlins/peace.gif
 
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Where did you get only 300 HP for the 6.0L? /forums/images/graemlins/yikes.gif Everything I've seen and read puts these badboys at 370 HP and like 360 TQ.


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Silly Afro, I got it off GM's website. I don't think GM would put out a motor in a truck meant to be worked that made more horsepower than torque. Those 2500HD badges must up the horsepower of the 6.0L, eh? Even the Silverado SS only makes 345. You can argue and say "well, they're underrated anyway" then I'll say "so is the curb weight".

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I have also drivin our family 86 305 equiped K5 and even with a manual, it SUCKED.

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160 raw earth shaking ground breaking horsepower at the crank. Probably more like 145. It probably weighs no less than 4500lbs also.

I've had my truck on the dyno. It makes more power to the ground than you do at the crank. 190@5600. With jetting changes and synthetic lubricants the most I ever made was 205@5500. I don't think you can get much more than 275hp out of a 305 without losing your vacuum assist at idle. You figure at least 55hp is getting gulped up by the first generation 700R4 because the torque converter never locks up under WOT and another 20 magically disappears between the transfer case, the crappy driveline angles, and the 10 bolt.

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Right now I also have a 80 K10 with a manual and fairly fresh 350 and still, not even close. My burban is a little more or a beast after the 4.56 gears, I think my quarter mile might be down into the teens by now /forums/images/graemlins/whistling.gif, but still no comparison. Sure there is a weight difference but there is also a HUGE horsepower difference, you cant beat more power /forums/images/graemlins/waytogo.gif.

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I run 15s with 31" rubber. If I put my pizza cutter snow tires on and gut my truck of all of its extra weight the 14s are pretty reliable.

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Getting back on subject, go with the 8.1L, I know a few people with them and not a single complaint, they all love them /forums/images/graemlins/peace.gif

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I second that motion.
 
Hhhmmmmm...how dissapointing /forums/images/graemlins/doah.gif. One thing I know for sure though is that the 6.0L is a high revving engine which is probably why its milage sux. Hitting 6K on acceleration is not unusual and the truck averages 11.5 MPG all around /forums/images/graemlins/yikes.gif. I noticed that my 97 Z71 had more gettup off the line but mom's truck hauled balls from about 40-90 MPH. Strange engine for a truck lol. I still like it though. When I have the truck loaded down with 1100 pounds of corn and misc. other hunting crap, it didnt phase it. The Z71 gets a little sluggish with that same load but the crewcab handled it like it wasnt there. All Vortecs rule, regardless of displacement or generation /forums/images/graemlins/waytogo.gif
 
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Hhhmmmmm...how dissapointing /forums/images/graemlins/doah.gif. One thing I know for sure though is that the 6.0L is a high revving engine which is probably why its milage sux. Hitting 6K on acceleration is not unusual and the truck averages 11.5 MPG all around /forums/images/graemlins/yikes.gif. I noticed that my 97 Z71 had more gettup off the line but mom's truck hauled balls from about 40-90 MPH. Strange engine for a truck lol. I still like it though. When I have the truck loaded down with 1100 pounds of corn and misc. other hunting crap, it didnt phase it. The Z71 gets a little sluggish with that same load but the crewcab handled it like it wasnt there. All Vortecs rule, regardless of displacement or generation /forums/images/graemlins/waytogo.gif

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My '03 2500HD crewcab 4x4 and my dad's '02 2500HD ext. cab with the 6.0L, auto, and 4.10s consistently get 15-16 mpg, and I'm usually not easy with the throttle either. In comparison my old '01 Dodge quadcab 4x4 with 5.9L gas, auto, and 4.10's never got better than maybe 12-13 mpg.

The 6.0L also has way more "seat of the pants" power than the Dodge. Even my wife, who is not into motorsports or cars at all, used to say that the Dodge felt a lot slower than her mid-size V6 powered car. The first time she drove the 6.0L Chevy she commented that it felt faster than her car.

The only way to hit 6k on the 6.0L is if you are accelerating with your foot buried on the floor and will contribute to poor gas mileage /forums/images/graemlins/whistling.gif Whether or not the engine is a "high revver" doesn't really contribute to the gas mileage of the vehicle. Most econo-box cars have engines with the powerband way up on the rpm scale and they get good mileage........
 
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