VVTi
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Shane's lotus has VVTi and it hits hard and sounds damn good!!!
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i like my AVCS....but i cant even tell when it kicks in...SHITTY!
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VVTi is Toyota's answer for Honda's V T E C. Im not too familiar with VVTi, but Honda's i V T E C not only increases lift, but changes the phasing of the opening/closing of the intake valves. But holy shit does it suck gas down when mine kicks in.....
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Saab Variable Compression (SVC)>honda and its silly V tec
Variable compression:
When you need more power, the supercharger clutch engages, the monohead hinges upwards, the compression ratio reduces and the SVC engine can cope with huge boost pressures. The compression ratio runs at whatever gives the best efficiency for the moment, across a range from 8:1 through to 14:1
http://www.trollhattansaab.net/archives/2005/09/post.html
DISCUSS
HONDAHATER4LIFE.....
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wannabe wrote:
why wouldnt they just build the motor to handle the supercharged at 14 psi. Variable compression only means one thing; the motors are too weak to hold boost...why does that mean they are too weak to hold boost? there is a reason fi cars dont run 9:1 and 10:1 compression. You raise compression, get better mpg... lower compression as throttle raises and make horsepower? sounds kinda like vcrap, except good?
Someone tell the current management at GM about this shelved SAAB technology, which offers better performance and better fuel economy than their proposed hybrid!
gm owned
edit: 1.8 bar is not 14lbs, noob
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Here is a simple breakdown that usually applies....
honda= for n00b high school drivers since that is usually all they can afford. Reliable engine that has no power. Usually a tuners first car and they get excited about exhaust because they just gained 1 hp. Can beat cavaliers, geo metros, etc....
dsm= intermediate to advanced. High powered platform that may blow up if pushed to the limit. smokes honda's all day long. costs more to fix than a honda. usually doesnt race a honda because they are a waste of their time.
evo or sti= ultimate driving machine under 30,000 that has a powerful platform and potential to run 11's all day long with minor bolt ons. When they see a honda line up next to them, they dont even look over because they know it would be a waste of there time...
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99slowGSX wrote:
Here is a simple breakdown that usually applies....honda= for n00b high school drivers since that is usually all they can afford. Reliable engine that has no power. Usually a tuners first car and they get excited about exhaust because they just gained 1 hp. Can beat cavaliers, geo metros, etc....
Yeah GSR, eat that! -
Imagine if there was a more advanced, tunable engine management to go along with the variable compression.
Fuel economy aside.
In simplest terms I can think of with out writing a book on the idea, which would probably be easier than breaking it down.Take a turbocharged engine that makes full boost around 4k rpm. As nice as that is, your lower rpm suffer on account of the low compression, low psi..
But say in a perfect world if you could raise compression, in the lower RPM range obviously, before your turbo spooled how much of a difference it would make...
Being able to run more boost, at higher RPM, without the low end loss of lower compression.
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