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10-14-2001, 09:26 PM | #1 |
Scooby Newbie
Member#: 9012
Join Date: Aug 2001
Location: Montreal, Canada
Vehicle:2002 WRX Sedan Platinum Silver |
Turbo vs Supercharger
Need a little help here. I was having a discussion with a buddy about the difference between a turbo and a supercharger. Now I understand the difference, however, why do manufacturers (like Subaru with the Rex) prefer turbo to a S/C? Isn't a S/C less expensive to install and maintain? And why not put a S/C on a 2.5 L engine as opposed to a turbo in a 2.0 L engine?
On a N/A engine, people prefer upgrading to a S/C for cost reasons and ease of installation. Also, isn't a S/C always on as opposed to a turbo only kicking in after a certain engine speed? And why can't the Rex's turbo start spooling at 2000RPM as opposed to 3000RPM? Wouldn't that provide more torque at lower RPM? Would that sacrifice any power at higher RPM? Or is it because the turbo is too big for the exhaust pressure at such low RPM and therefore would not provide additional power? I know that's a whole bunch of questions, but maybe someone can give me some insight as to the physics and/or mechanics behind turbo vs S/C in order for me to better understand. Later...
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10-14-2001, 09:31 PM | #2 |
Scooby Specialist
Member#: 3231
Join Date: Dec 2000
Chapter/Region:
RMIC
Location: colorado springs colorado usa
Vehicle:88 626 Turbo white |
easily put no one has areliable sc kit.. there are tons of turbo kits avail though. imo
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10-14-2001, 09:36 PM | #3 |
Scooby Guru
Member#: 7321
Join Date: Jun 2001
Chapter/Region:
NESIC
Location: waltham, ma
Vehicle:.... 122 IggPoints Work... ahhh... so tired. |
you have a lot of ???
http://www.howstuffworks.com/ go there and look up turbos n superchargers. scc has some good articals too http://www.sportcompactcarweb.com/ turbos are more effective then superchargers. |
10-14-2001, 09:45 PM | #4 |
Scooby Newbie
Member#: 9255
Join Date: Aug 2001
Location: Philadelphia Area, PA
Vehicle:2002 WRX Wagon WRB |
Why not? OTTOMH you have
1. Cost 2. Ultimate power 3. Complexity of install 4. Race car rules and sanctions You have to look more into a supercharger, versus a turbo-supercharger (technical name for a turbo SCs are usually less thermally efficient, although some types such as Twin Screw/Lysholm are a lot better then roots blowers of old. There are several types of SCs, positive displacement, centrifugal, etc....so not all have the same power curves, and you can't make a blanket statement about how SCs behave in the same way you can a turbo (although with the turbo, you always have to know about the A/R, sizing, bearing types, etc...). For ultimate race car power over high RPMs, a turbo will be easier to develop and maintain. With the exception of top fuel drag racing, I don't know of any other major race series using SCs vs NA or Turbo cars. You are also correct: for a small displacement 4, a SC will have more noticable parasitic drag then something with displacement That is not to say a 6-8 PSI SC for a 2.5L Scooby with a redline of 6000 RPM would not be a hoot...its just not what Subaru is used to doing. With the ever increasing emmission requirements, you may see more and more OEM SC applications as they are not as difficult to get clean as a turbo system (easier to light off single cats, for example) - b |
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