06-18-2013, 11:48 AM | #57 |
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Yes of course you can compare them. If you throw numbers out the, then they can be compared to other numbers. Boost is what is making the power. The fact is that an engine with boost will make X amount of power. A more efficient engine will make more power with less boost. At some point tho an engine will reach it's limit as to efficiency and more boost will be needed. So you can compare how much boost it would take an engine of smaller size to make the same amount of power as an engine of a larger size. And given similar boost and engine efficiency (head flow, cam specs, etc) a larger engine will always make more power than a smaller engine with the same amount of boost. Those Evo guys making 500 hp in their engines, they need 15 lbs of boost. And that's with modded cars. LS3 engines can make close to 600 hp with less than half that with an otherwise bone stock car. Give a Viper the same boost as an LS3 and it will make even more power (obviously).
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06-18-2013, 12:34 PM | #58 |
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06-18-2013, 12:53 PM | #59 | |
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A v6 3.6 with 20 psi boost is more efficient than a 6.2 v8 with 10 psi boost IMO. Which car is more efficient? |
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06-18-2013, 12:59 PM | #60 | |
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If a LS3 motor was equipped with two of my turbos I very seriously doubt it would make any more power than mine does. It would probably make less because it would have to run richer to handle the higher cylinder temps. They have to run a pretty big turbo to make 600 HP on just 9-10 psi.
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06-18-2013, 01:08 PM | #61 |
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How do you figure that? And don't dare say hp per cubic inches. If a 3.6 at 20 lbs of boost makes the same hp as a V8 with half the boost then obviously the V8 engine is more efficient. Because it is using less positive pressure but making the same hp. I don't think you quite understand the concept of efficient hp.
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06-18-2013, 01:12 PM | #62 | |
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06-18-2013, 01:29 PM | #63 | |
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06-18-2013, 01:38 PM | #64 |
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No I know what I'm talking about. But if you're soo confident, how about you explain yourself without quoting an article or book or something from a Google search. Because if you think an engine making 600 hp at 20 lbs of boost is more efficient than an engine making 600 hp at 10 lbs of boost...then you are very wrong.
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06-18-2013, 01:40 PM | #65 | |
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Given the same volume of air going into a port injection engine and a direct inject engine, the DI engie will make more power because it can run leaner without detonation. Watch what kind of power the LT1 makes when people start going FI on them. I wouldn't be suprised if they make over 80 HP/eL and 190+ HP/L.
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06-18-2013, 01:58 PM | #66 |
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Ok I get what you're saying (you can disregard my previous post BTW). We are on the same page. You could make the same power if you could move the same volume of air. And that is what displacement, boost, higher flowing heads, compression, etc is all about...moving a larger volume of air.
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06-18-2013, 01:59 PM | #67 | |
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06-18-2013, 02:46 PM | #68 | |
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06-18-2013, 03:21 PM | #69 |
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Yep....its all about the amount of air moved, and not the boost.
Hell...with cam phasing on the V6 you can change that and cause an increase of boost pressure (b/c of less air getting in) and make less power.
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06-18-2013, 03:22 PM | #70 | |
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Thanks for sharing!!
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