Does any one know if there is any hp gains/sound on keeping the hydraulic valve from the right tip of the exhaust open? I've read the 330 exhausts are strraight pipes in the inside.
From what I understand, the valve is there so that at lower RPMs you get more back pressure, hence better low end torque and is open at higher RPMs so you get better horse power. I wouldn't dink with that valve personally.Don Juan said:Does any one know if there is any hp gains/sound on keeping the hydraulic valve from the right tip of the exhaust open? I've read the 330 exhausts are strraight pipes in the inside.
Not to discredit the original poster of that message, but even he himself wonders if it's just in his mind that the car feels more responsive. In reality, the SOUND that it makes probably accounts for that feeling. I would LOVE to see some dyno figures with the valve active and de-activated.Don Juan said:Just curious. On the #46Fanatics forum, a couple members have done it and mentioned a deeper sound and no decrease in performance . :dunno:
See link http://forum.e46fanatics.com/showthread.php?threadid=1966
The comments are below :
My Ride: 2001 330ci
Location: bay area
330ci Exhaust flap
Going on the advice of a few member of this board, I decided to disable that little flap that is present on 330's. (the one that closes in lower rpms and opens on higher rpms) You know what? The car seems more responsive! Its also abit louder, but I like it, sounds sporty! So my question is this: Does this really make a difference? or is it just all in my mind?
My Ride: Alpine 330Ci
Location: Vancouver, B.C.
I did the same thing (might have even been my advice ) i haven't noticed any decrease in power at all. I like the little extra exhaust note it adds as well.
2001 Alpine White 330Ci
You mean LEV ratings don't seem to do much with FUEL CONSUMPTION. Sure, the Ford Excursion may be an LEV but it drinks gas like a hick through Moonshine.Kaz said:Its interesting to note that according to the ETK, only 330 and 325xi have the valve, and the other models don't. I don't know if anyone (31st330i?) has ever been able to come up with why.
Also, LEV ratings don't seem to do much with displacement, as the Ford Excursion is also a LEV. :dunno:
Civic is actually ULEV. I think it was one of the first to get the ULEV designation. Still doesn't detract from the 3.0's GREAT fuel economy on the HW and relatively good city considering how we drive them. :thumb:SONET said:The increased back pressure may also be helping the catalytic converters work more efficiently. The 330 has a very low emission rating - ULEV. In comparison, the Honda Civic I looked at the other day was 'just' rated as a LEV. If you consider the difference in displacement, that is a pretty amazing accomplishment.
The 2l is in the new Civic Si, and is also the base RSX engine.Adrian 330Ci'01 said:.
P.S. Just checked your site (cool thanks!:thumb: ) and you were looking at the 2.0 L engine which I have never heard of. The 1.7L engine is ULEV:
it's not hydraulic (liquid or hydro *pressure*) or even pneumatic (air *pressure*). it's vaccum actuated. the vacuum source is controlled (open or closed) by a solonoid which is in turn controlled by the ECU. the solonoid is located inside the trunk bust beneath the left rear tail light. in fact (on a sedan anyway) you will see a small seem in the sheet metal just below the tail light. the vacuum solonoid is just begind that seem. the relaxed position is open (simply sated as "normally open").Don Juan said:Does any one know if there is any hp gains/sound on keeping the hydraulic valve from the right tip of the exhaust open? I've read the 330 exhausts are strraight pipes in the inside.
simply disconnect the vacuum hose at the muffler. screwa a small bolt into the line or shove a golf tee into it. secure it with a tie strap so it doesn't rattle.Nick325xiT said:I have to wonder if there's a way to disable it temporarily.