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Old 3rd March 2005, 22:12   #16
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I guess a supercharger is more effective.. its used in the mercs and mostly petrol cars are superchared whereas diesel are turbocharged.. superchargers use more air.. wheras turbos use more fuel..
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Old 4th March 2005, 12:17   #17
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Quote:
superchargers use more air.. wheras turbos use more fuel..
LOL dude please go thru the thread from the beginning.
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Old 5th March 2005, 01:06   #18
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Quote:
Originally Posted by coloneljasi
Too bad only MB has managed to perfect the system.
i know some guys with vortec sc's on their american v8s that are going to be very upset at that!!!

nothing's better than a

viper
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Old 15th March 2005, 21:24   #19
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As many members have stated, turbochargers need a specific amount of exhaust pressure building up in the headers before the turbine actually spin fast enough. When the turbine spins fast enough the compresor wheel (impeller) spins at the same rpm and pressurizes the intake manifold. It means that until you've reached a specific rpm and the throttle is opened enough, the engine would actually lose power over a naturally aspirated engine, because the engine has to oppose the turbine's inertia by forcefully pushing out the exhaust gases. Ones that specific rpm is reached the turbine and compressor spin at extremely high rpms(read somewhere 100000 rpm +) cramming more AF mixture into the cylinders. All turbochargers have a centrifugal compressor, and this is the characteristic of a centrifugal compressor. A centrifugal compressor needs to spin at very high rpms to increase pressure.
Superchargers used are generally are positive displacement compressors driven by the crankshaft torque. Some +ve displacement compressors are roots, lysholm screw, sliding vane. These compressors displace a fixed volume of air per revolution(unlike a centrifugal compressor), so in effect they work practically off idling rpm, so they cramm in more AF mixture right from idling rpm, but again they rob precious crankshaft torque( supercharger units have rotors which are much heavier than the ultra lightweight turbocharger turbines and impellers) , but more than make up for it by making the engine burn more charge and making more power.
I believe vortech makes centrifugal superchargers, again these would face the same problem as turbos but atleast they wont tax the engine at higher rpms.

Last edited by topend_hooligan : 15th March 2005 at 21:30.
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Old 15th March 2005, 21:55   #20
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I saw a few dyno vids of turbocharged Hayabusas from www.suzukihayabusa.org. The bikes in the vids are making as much as 600 rwhp. But you can hear the revs to be suddenly and abruptly rising to the peak after a certain point.
Also centrifugal compressors displace HUGE amounts of air per specific time period, hence they are the preffered choice for engines made to make power in the higher region of the rpm range of the engine.
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Old 27th August 2006, 15:32   #21
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Thanks for the information all you guys ... i was looking for this thread
Thanks Again..
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Old 27th August 2006, 22:45   #22
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The best is having both of them

Lancia Delta the famous rally car used both

Supercharger for low and mid range power and turbo for the high end

the new volkswagen golf 1.4 tdi has both and manages 190bhp out of a small oil burner and has exceptionally good mileage
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Old 23rd February 2007, 09:00   #23
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Turbochargers IMO is any day better than a super charger until in certain specific set ups!
obviously turbocharger have a huge top end hence one has to be a hell of a driver to keep the REVS high up there while smashing through gears. also fuel efficiency wise turbocharger does not come on boost till high revs so less fuel consumption as on the other side superchargers are belt driven so always on boost and hence chews a hell of a lot of fuel..
but again at the end of the day each to their own!!

cheers
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Old 23rd February 2007, 11:32   #24
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In places with extreme heat,turbo-charged cars tend to have overheating issues and so Superchargers should be used.
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Old 23rd February 2007, 13:27   #25
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Quote:
Originally Posted by nitrous View Post
In places with extreme heat,turbo-charged cars tend to have overheating issues and so Superchargers should be used.

thats why multi core radiators are available in the market and thermofans as well!
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Old 23rd February 2007, 16:25   #26
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Quote:
Originally Posted by harsh87 View Post
the new volkswagen golf 1.4 tdi has both and manages 190bhp out of a small oil burner and has exceptionally good mileage
190 BHP from a 1.4 Diesel is astonishing.
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Old 17th May 2007, 15:49   #27
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Guys can someon please explain how the VW Golf uses both supercharger and turbo simultaneously? doesnt it mean that at high revs there will be boost from supercharger as well as turbo at same time? how is that taken care of? thanks..
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Old 21st May 2007, 20:30   #28
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SC used power directly frm d engine... unfortunatly nt many indian cars r muscles cars wid 300bhp + which can afford d extra load...
so a TC is certainly preferable on Indian cars
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Old 21st May 2007, 20:52   #29
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Quote:
Originally Posted by Deepz View Post
Guys can someon please explain how the VW Golf uses both supercharger and turbo simultaneously? doesnt it mean that at high revs there will be boost from supercharger as well as turbo at same time? how is that taken care of? thanks..
It should be easy enough to have a valve diverting excess boost, or maybe they use the same boost. Another method is to have the supercharger run off an electromagnetic clutch, like the AC compressor.
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Old 21st May 2007, 21:05   #30
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this should give you a idea.

here is also a impreza with it:

Last edited by pawan : 21st May 2007 at 21:10.
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