To add to that:
Bypass valve > BOV
Especially for MAS type systems. With MAP, the difference is smaller.
To add to that:
Bypass valve > BOV
Especially for MAS type systems. With MAP, the difference is smaller.
Originally posted by: b0mbrman
Thanks. Just makes it easier for me to know which car to rob
Steal-Me-Stickers : Aiding the criminally inclined since 19xx.
- M4H
Shake the walls...
If thats all its doing , your not loud enough!!!!
http://www.wootworx.com/movies/392fresh.wav
If thats all its doing , your not loud enough!!!!
http://www.wootworx.com/movies/392fresh.wav
- Oct 10, 1999
- 31,328
- 12,838
- 136
Actually as long as aftermarket parts are approved by CARB and licensed by SEMA there is no EPA violation.
Noise standards are a local issue.
If I put a Walker muffler on a car to replace the OEM muffler, there is no violation. Even if it is louder than stock. Free enterprise allows this. Noise is not the concern of the EPA. As long as emmisions aren't changed for the worse, its a legal replacement.
TheLonelyPhoenix
Diamond Member
- Feb 15, 2004
- 5,594
- 1
- 0
Honda? Mustang?
I still love my Caravan with it's 3.3 V6. Fast enough to keep me happy, silent to please the neighbors, and slow enough to keep me from getting pulled over!
158hp @ 4850 RPM
203lb-ft @ 3250 RPM
4000+lb curb weight
I still love my Caravan with it's 3.3 V6. Fast enough to keep me happy, silent to please the neighbors, and slow enough to keep me from getting pulled over!
158hp @ 4850 RPM
203lb-ft @ 3250 RPM
4000+lb curb weight
You're an idiot.
Turbochargers themselve convert energy (heat and SOUND) into movement of the turbine wheel. The actual design of a turbo quiets the exhaust significantly. That's why turbo cars usually have less resonators and premufflers on them. My 95 Stealth R/T TT has 2 less premufflers than the NA car and it is just as quiet.
Why don't you read a little bit about turbos instead of staring at fart cans. It is very easy to make a fast, powerful car that really isn't that loud. You just can't be an idiot like yourself.
Vic
Elite Member
- Jun 12, 2001
- 50,422
- 14,337
- 136
Wrong. The turbo charger itself always acts as a kind of muffler. How the fsck do you think it's spooled up but by harnessing energy from the exhaust?
You're no longer allowed to post like you know jack sh!t about cars, because you obviously don't. You made an absolute fool of yourself in this thread. Go back to your Civic, idiot.
OMG what a fscking moron. You know more or less nothing about how engines work. Here's a clue. An engine is an air pump. The more air it can pump, the more power it can produce. There are 3 ways to push more air through a motor. The first (and most popular) is to increase the overall displacement, no power drawbacks just increased weight and fuel consumption. The second (which is Honda's way) is to increase the rpm redline to the moon, but this has the drawback of not increasing torque, as torque is created through displacement. The third is to use forced induction, which acts like instant displacement and increases both torque and power, and the only drawback is waiting for the supercharger to spool up.
Of the 3 ways to increase power, Honda's "all motor" technique is the most inferior BY FAR. It is essentially nothing more than a fancy lumpy cam system.
Back on topic. I think cars should have a well-tuned sound. Not too loud, not too quiet. All I want to do is hear it, I don't really care if anyone else does.
For the record, my WRX has a catless uppipe plus TurboXS Stealthback turbo back exhaust (4" thermal-coated bellmouth downpipe plus 3" high flow cat and center pipe) with a Prodrive axleback muffler. Nice low rumble under normal driving circumstances, not too loud WOT, and no louder than stock cruising on the highway. Great looking too... the entire axleback is polished stainless steel with a rolled edge oval tip.
BOV's dont always have to be loud, the ones that dump the extra boost back into the exhaust are silent, and there is no need for these rice rocket jackasses with the screaming BOVs.. its useless and completely "look at me" imo.
Vic
Elite Member
- Jun 12, 2001
- 50,422
- 14,337
- 136
You are correct. They're called recirculating bypass valves. Except they dump back into the intake, not the exhaust. The wastegate is what dumps back into the exhaust.
Screaming BOV's on street cars are exclusively for bling, and can actually reduce performance and/or harm the engine because they can screw with the A/F ratios.
Originally posted by: cmdrmoocow
18yo college kid
Minivan PowAh!
/also drives an 03 Odyssey
Props for not ricing it out like I'm sure your friends tell you to. And I concur - nothing like being invisible to the "College Kid Radar" that comes standard on police cars.
- M4H
amdzen: just cause your car has turbos doesnt mean it has to have LOUD BOVs...my friends s4 doesnt even have BOVs. (btw running 17-18psi)
Demon-Xanth
Lifer
- Feb 15, 2000
- 20,551
- 2
- 81
As far as "peak power is what is important" is concerned, compare that more than once, I have had a Celica GTS fail to keep up with my truck. 180HP, 2700LBs=15LBs/HP. 230HP, 4200LBs=18.3LBs/HP.
...shouldn't I have lost? Why didn't I? Why did they have to spin the tires at launch and I didn't?
Simple: They have a very narrow, high up power band, and I have a wide one that is well within normal driving conditions.
The SRT-4 (230HP) and WRX (227HP, non-STI for this example) all have wider power bands than the the RSX, Celica GTS, and others that would be in thier class. But the performance isn't even close. The dyno charts I have seen for the SRT-4s have really suprized, and impressed me. The performance from the WRX impresses me. The RSX and Celica GTS to me are prime examples of peak number focus.
Another example of the peril of high RPM tuning:
S2000:
0-60 5.5 seconds. Not bad.
5-60 6.9 seconds. Not that good.
For 240HP and 2900LBs, that last number is flat out awful. It means that to perform well, you have to flog it. Taking off from a roll costs you a second and a half.
Neon SRT-4, 230HP, 3000LBs. The S2000 SHOULD beat it. Hell, the S2000 even has RWD!
0-60: 5.3 seconds. It's close
5-60: 5.7 seconds. The S2000 got SERVED!
Unless you like burning the tires and clutch on the street, a wider, lower band can pay off in dividends.
...shouldn't I have lost? Why didn't I? Why did they have to spin the tires at launch and I didn't?
Simple: They have a very narrow, high up power band, and I have a wide one that is well within normal driving conditions.
The SRT-4 (230HP) and WRX (227HP, non-STI for this example) all have wider power bands than the the RSX, Celica GTS, and others that would be in thier class. But the performance isn't even close. The dyno charts I have seen for the SRT-4s have really suprized, and impressed me. The performance from the WRX impresses me. The RSX and Celica GTS to me are prime examples of peak number focus.
Another example of the peril of high RPM tuning:
S2000:
0-60 5.5 seconds. Not bad.
5-60 6.9 seconds. Not that good.
For 240HP and 2900LBs, that last number is flat out awful. It means that to perform well, you have to flog it. Taking off from a roll costs you a second and a half.
Neon SRT-4, 230HP, 3000LBs. The S2000 SHOULD beat it. Hell, the S2000 even has RWD!
0-60: 5.3 seconds. It's close
5-60: 5.7 seconds. The S2000 got SERVED!
Unless you like burning the tires and clutch on the street, a wider, lower band can pay off in dividends.
HAHAHAHA this thread is great, if for no other reason than to laugh at AMDZen and his automobile engine "knowledge"
He is perhaps the ideal example to the OP as to why people like loud cars.... because they are CLUELESS and think a loud exhaust = more power and that a loud BOV = more power.
Loud = loud. Loud =! power.
A well engineered exhaust system is not terribly loud OR restrictive enough to reduce power significantly over a completely muffler-less exhaust. And a BOV that vents back to the intake offers no performance penalty over a BOV that vents to atmosphere and sounds obnoxious.
He is perhaps the ideal example to the OP as to why people like loud cars.... because they are CLUELESS and think a loud exhaust = more power and that a loud BOV = more power.
Loud = loud. Loud =! power.
A well engineered exhaust system is not terribly loud OR restrictive enough to reduce power significantly over a completely muffler-less exhaust. And a BOV that vents back to the intake offers no performance penalty over a BOV that vents to atmosphere and sounds obnoxious.
Wow - this thread turned into something... well...
Break out the :beer:, the pretzels and the poker chips guys.
Break out the :beer:, the pretzels and the poker chips guys.
- Oct 10, 1999
- 31,328
- 12,838
- 136
I nominate AMDzen for stupidest post/reply of the year award.
He reminds me of the guy that brags how fast his car is, but never races it against anyone he brags to. Then when you do finally see his "car", its a worn out 1984 Firebird with a big hood scoop and big rear tires on cragar SS rims. And gets his a$$ spanked by the first 318 diplomat that pulls up beside him.
Seriously, we knew a guy just like that.
He reminds me of the guy that brags how fast his car is, but never races it against anyone he brags to. Then when you do finally see his "car", its a worn out 1984 Firebird with a big hood scoop and big rear tires on cragar SS rims. And gets his a$$ spanked by the first 318 diplomat that pulls up beside him.
Seriously, we knew a guy just like that.
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