VVTi
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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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03/04 Cobra > *
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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....
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...
I'll give My breakdown....
DSM: Very easily made into a 13 second car on bolt ons. poorly designed trannys on very powerful motors break because people Love to launch awd cars because "DUDE THIS SHIT PULLS HARD". They are involved with the easiest type of racing known to man "drag" racing. Most users pull everything but their tach to make their car weigh as much as a accord with a competition stereo. Basically a city boys camaro.
Honda: the most reliable car to modify. Also, one of the cheapest car to modify. Very detuned factory engines, and very efficient along with very good gas mileage. lightweight, and nimble supsension are 2 major strong points. They have released a RWD roadster to compete with a market that once belonged to german cars.
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treimche wrote:
I have VVTI, you should hear when it kicks in, it actually kicks harder than Chuck Norris.Chuck Norris invented VVti. Anyone that says v-tec, etc is better than VVti gets a roundhouse kick to the adam's apple.
DaveH
'94 Supra- 7.77 @ 176mph -
i sold my honduh for a subie...so yeah i guess i agree honda ftl.
besides honda's so stupid...they made a turbo jetski before they made a turbo car.
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wannabe wrote:
its not like you can't boost a high compression motor... it just needs to be built...It isn't as much into the build as it is into the TUNING. You aren't going to have a very fun time running 14:1 compression on premium with a supercharger....doesn't matter if the motor is built or not...
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