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Old 01-27-2015, 04:45 PM   #29
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Yeah, I think it's a mistake to confuse the 2015 5.3 with the ones before. The new one has much more power.
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Old 01-27-2015, 05:37 PM   #30
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Yeah, I think it's a mistake to confuse the 2015 5.3 with the ones before. The new one has much more power.
It was also a Gen 5 motor in 2014.
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Old 01-27-2015, 05:40 PM   #31
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Was Koons able to give you any kind of timeframe for when GM will open the order banks?
Ok, I have now checked with 2 of my sales counterparts and looked at the restrictions list myself. There is no constraint on 6.2l maxtow combination. There could be an issue with dealers software. Have him call their district manager.
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Old 01-27-2015, 05:53 PM   #32
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It was also a Gen 5 motor in 2014.

That's right, I forget sometimes that I'm thinking about the SUVs and that the pickups got the new engines for 2014.
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Old 01-27-2015, 08:35 PM   #33
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That's right, I forget sometimes that I'm thinking about the SUVs and that the pickups got the new engines for 2014.
correct.
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Old 01-27-2015, 09:13 PM   #34
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@ "dznf0g"
Thanks for chiming in. I needled the dealers sales manager again about this. We'll see what comes of that.

I'm not sure what the point is of comparing the output of the "Ecotec" 5.3 liter (355 hp) with the 1977 454. Everyone old enough to remember knows that early de-smogged engines in the 1970s were less powerful than their 1960s predecessors, used more fuel and started and ran much worse. Only the introduction of electronic fuel injection and engine controls in the 1980s fixed the power and drivability problem.
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Old 01-28-2015, 08:10 AM   #35
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Who wants to drive an engine at 5600 rpm to get the Max hp of 365 and 4100 rpm to get 383 lbs of torque??this is a going to the cafe to have coffee with the retirees engine.....
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Old 01-28-2015, 08:16 AM   #36
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At what RPM the max torque is produced is not as important as at what RPM 90% of torque is produced. This is especially true with truck engines.

See graph and discussion here:
2014 Silverado/Sierra Release 5.3L MPG, Power, Payload and Towing Numbers - PickupTrucks.com News

Pretty darned flat. See comments in the paragraph just above the chart.
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Old 01-28-2015, 08:31 AM   #37
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@ "dznf0g"
Thanks for chiming in. I needled the dealers sales manager again about this. We'll see what comes of that.

I'm not sure what the point is of comparing the output of the "Ecotec" 5.3 liter (355 hp) with the 1977 454. Everyone old enough to remember knows that early de-smogged engines in the 1970s were less powerful than their 1960s predecessors, used more fuel and started and ran much worse. Only the introduction of electronic fuel injection and engine controls in the 1980s fixed the power and drivability problem.

My 08 5.3 makes more horsepower than ANY factory 454 made after 77, fuel injected models inclusive.

My research shows that not a single factory 454 made 300 HP after 1977.

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Old 01-29-2015, 07:27 AM   #38
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Still the same old story, it takes cubic inch for a truck engine.
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Old 01-29-2015, 08:26 AM   #39
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Still the same old story, it takes cubic inch for a truck engine.

Yes, and a hand held computing devise connected to the www is just silly talk.


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Old 01-29-2015, 10:02 AM   #40
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Quote:
Originally Posted by dznf0g View Post
At what RPM the max torque is produced is not as important as at what RPM 90% of torque is produced. This is especially true with truck engines.

See graph and discussion here:
2014 Silverado/Sierra Release 5.3L MPG, Power, Payload and Towing Numbers - PickupTrucks.com News

Pretty darned flat. See comments in the paragraph just above the chart.
Thanks for the link.

When I tow with my 2014 5.3L in the mountains, pulling my ~6,000lb 25' Safari, going up an 6-8% grade, the truck seems to settle in at ~4,000 rpm in 3rd gear and maintains speed of 50+. I can still accelerate if I choose. I think that is the "sweet spot" just below the peak in the torque's bell curve.
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Old 01-29-2015, 11:06 AM   #41
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Why did they skew the HP and torque chart?

Top of the chart for HP is 400, and top of the chart for torque is 450,,,,

This might lead a person to think that charted torque and hp figures don't ALWAYS cross at 5252 RPM.


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Old 01-29-2015, 02:09 PM   #42
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Because the torque and horsepower don't rise at a one to one ratio at any given RPM. Something has to be skewed or you would have odd "dropouts in the line(s). If you want to represent a smooth RPM and torque line, then you have to skew one of the Y axis....or skew the x axis and have constant Y axis values.

This is me....not explaining very well.....where's someone with the proper math terminology?
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