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 urmas
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 Turbocharger, Supercharger, or NOS?
Väljavõte StangNeti foorumist:
For a car that's mainly a daily driver, i'd say a roots/twin-screw blower or nitrous would be the way to go.
I would stay away from centrifuge blowers like ati, vortech, paxton, etc, etc. for a daily driver because you lose a lot of low end with them, plus if you drive in a lot of stop and go traffic the blower whine can be annoying to yourself and others.
A roots or twin-screw blower will give you TONS of low-end torque, but roots blowers usually die on the top end, and i'm not sure if anyone has a twin screw for the 4.6 4V cobras. Plus they arn't nearly as noisy at idle as a centrifuge.
If you wan't normal power for daily driving, then an added burst when you wanna race, nitrous would be good. You could bolt-on a 100 horsepower wet kit for cheaper than a blower, and it's only on when you want it to be on.
Last option is a turbo. Turbos basically have all the advantages of a twin-screw blower, but you can adjust boost from inside the cabin. The downsides are high cost, hard installation, and high install price. Unless you have some money to spend, and/or are mechanically gifted and have a lot of tools, a roots or twinscrew would be the way to go.
As far as traction goes: Nitrous would be the best, because that doesn't kick in till over 3000 RPM's anyways. With a roots or twin-screw you'll get less traction because they kick in at about 2000 or so RPM's, so you would have to be a bit easier on the throttle. A turbo is about the same, if they're making the same amount of boost.
Which one makes more power: Well, it all depends. You could probably run a wet 150 shot on a stock engine, but you would need to set the car up for nitrous, so it wouldn't run as good without the juice. I wouldn't go higher than about a 150 shot of nitrous, and roughly 10 pounds of boost on a stock engine. With the blower you have to change pullies to change the amount of boost, and that takes time. With a turbo you just adjust a knob, you can do it while you're driving, which is really convenient.
And as far as wear and tear goes, the engine would probably last longer using the nitrous, as you only get the added power when you want it. A blower and a turbo will be about the sam.
So there you have it, I hope I helped. |
| 01.02.2002 at 22:45 |
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peep
 Moderator |
Turbocharger, Supercharger, or NOS?
Kui see nii oleks, miks siis ikkagi enamik tänapäevaseid aftermarket ülelaadimisega autod kasutavad tsentrifugaalkompressoreid ja turbo kit'id on ka üha rohkem levima hakanud 
Ise arvan, et probla nii roots tüüpi kopmressori efektiivsuses, kui selles, et seda ei õnnestu stock kapoti alla paigutada. Whipple kompressor on efektiisuse osas hea aga need väidetavalt ei suuda suurema mootori puhul piisavat survet tekitada, ehk tootlikus on nõrgavata. Ja see samuti nõuab mingit kõrgemat kapotti.
Selles mõttes on tal täiesti õigus, et nitro on juhukiirendamiseks parim ka mootori vastupidavusest lähtudes. |
| 01.02.2002 at 23:49 |
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jyrki
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Turbocharger, Supercharger, or NOS?
First of all, you do not lose low end torque with a centrifugal or a turbo if adding it to your current package. Depending on the size of the charger you can also gain on low rpm both with a turbo and a centrifugal. SAme is true with nitrous; it actually usually lowers the peak hp rpm and adds more torque than peak hp; it all depends which way you add the NO2. Roots style supercharger is very uneffective, it creates a lot of heat and pulls a lot of hp out of the crankshaft. With Gasoline you can get about a 50% gain in power with a roots but not much more. A centrifugal or a screw compressor is more effective and a centrifugal does not take as much power to rotate as a screwcharger. Both create a lot less heat than a Roots. A turbo is the most potent of them all, it actually creates less backpresure in the exhaust than boost on the intake. But all of them will give you good power, basically with a moderate nitrous, roots, cebtrifugal or turbo you can beat a pretty hot naturally aspirated engine. No matter how you build power, there is no straight way. You have to choose the parts according to the power level with the power adder, so basically if you are building a 400 hp engine that will use 300 hp worth of nitrous or some other power adder you have to build the engine using 700 hp quality parts in the first place. Mainly pistons, rods, crank, oiling, fasteners and fuel system. Otherwise your engine will have a very limited life ahead. |
| 01.02.2002 at 00:38 |
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