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scotty
Dodge Dakota
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2/26/2004
12:53:41
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 Subject: blow off valve
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is it possible to put a blow off valve on a stock 3.9 engine, or do i need the turbocharger to do this. just a question i wanted to know about. thanks
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oh my god
Dodge Dakota
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2/26/2004
17:20:59
|  RE: blow off valve
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Message:
captain beem me up the dumazz aliens replaced scottys brain with a faulty one.
Blow off valves are used to let off an intake mainfold overpressure situation caused by too much boost FROM A TURBO CHARGER!! NO way can a normally asperated engine ever need one!
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draugluin
Dodge Dakota
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2/26/2004
17:36:45
| RE: blow off valve
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i think he is just wanting the cool sound it makes :)
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IntenseDak39
*GenIII*
2/26/2004
18:00:15
| RE: blow off valve
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Message:
oh my god,
you are wrong. BOV's are use to relieve the pressure in the intake tube after the throttle blades are shut. While the blades shut, the turbo keeps spinning and builds up pressure. This can either harm the throttle body, blow of the intake pipe, hurt the turbo or all the above. The BOV uses a vacuum source from the manifold to know when to open and relieve the pressure. BOV dont relieve manifold pressure.
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another mark
Dodge Dakota
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2/27/2004
20:23:53
| RE: blow off valve
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Message:
Is this the same thing as a waste gate?
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GraphiteDak
GenIII
2/27/2004
20:48:36
| RE: blow off valve
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Message:
I believe so.
Ask Duner what happens when a Waste Gate doesn't open when it's supposed to on a turbo charged engine :-P
By the way, a blow off valve/waste gate would do nothing on a N/A engine. You're actually running negative pressure in the intake tube vs. a BOOSTED engine.
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GraphiteDak
GenIII
2/27/2004
20:50:40
| RE: blow off valve
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Message:
Oh yeah.
If he wants to really make some noise, and do nothing for performance, have him weld in a piece of guitar string or something inside his exhaust tip.
That could get someone's attention he he he :-P
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Nick
Dodge Dakota
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2/27/2004
23:36:55
| RE: blow off valve
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Message:
Hahaha,
Someone may as well post it:
http://inappropriatewebsite.com/carwhistle.wmv
-Nick
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GraphiteDak
GenIII
2/28/2004
12:42:22
| RE: blow off valve
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Message:
Yeah. That video has been out for MONTHS and is still funny as sh*t!
But the guitar string is easy. You could just screw it in place. I've never tried it myself. That would be as gay as running a fart cannon!
I'm just bringing it up for fun. I mean, if someone would actually think of installing a BLOW OFF VALVE, for the sound not KNOWING what it is really for, may just as well shove something up their tail pipe LOL!!!
That's all we need, more Riced out Dakota's!
"... I got a blow off valve man! Listen to it!". Others having half a brain would be like "...where's the turbo"???? "dumba$$". LOL :-P
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Nick
Dodge Dakota
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2/28/2004
14:38:38
| RE: blow off valve
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Message:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33742&item=2463554049
Read the description on that... Not quite as ghetto as a guitar string, but still pretty stupid if you ask me. Really, the sad thing is, there are tons of kids with those where I live. I wonder if they know that its actually slowing down their car.
-Nick
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GraphiteDak
GenIII
2/28/2004
22:34:04
| RE: blow off valve
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Message:
Too damn funny!!!
This is the photo they show:
This is the sedscription from ebay...
THIS AUCTION IS FOR THE ORIGINAL WHISTLER!!!!
Yes, this is the original straight from the factory turbo whistler.
Perfect for stock muffler pipes that are 3 inches in diameter and below, on ALL MAKES AND MODELS!
This little devise, adds the high pitch "spool" tone that adjusts with your rpm range to
your normally aspirated vehicle for just the fraction of the price of turbo??
Have you priced the cost of a Turbo lately??
Slow Car? Make it Sound Fasssstttttt!!!!! and have heads turn when your vehicle passes by.
This turbo whistler (exhaust insert) is made of a one piece machined aluminum.
It is made to sit inside your exhaust pipe. Extremely easy to install, and will NOT rust!!
Well how does it work?
The exhaust blowing through the device is expelled with great force through the small end,
creating a turbo "spooling" and the BOV (Blow off Valve) Sound
The higher your rpm rises, the higher pitch spool sound the device will deliver, much like a real turbo!!
What is it?
A small CNC machined aluminum device which discreetly fits inside a vehicle's stock muffler pipe and on heavy acceleration
emits a sound extremely similar to that of a turbocharged vehicle. Depressing the gas pedal in some instances have released
a backpressure in the muffler making the car sound like it has a Blow Off Valve. It cannot be easily distinguished between an
accelerating turbocharged car! You will not be able to tell the difference nor will pedestrians or other drivers on the street.
Let your friends ask you “what is under your hood!”
WHO USES IT?
This is the same device used by big movie companies when they want a normally aspirated car to sound
heavily turbo-charged (Do you really think they are going to spend all that extra time and money turbocharging
every car on the set)??
This whistler is a lot of fun, and if you get tired of it (or install a real turbo), just take it off
(or leave it on for double the effect)! At this price...why not?
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GraphiteDak
GenIII
2/29/2004
02:07:16
| RE: blow off valve
IP: Logged
Message:
Oops I type-o'd on that last one. I meant "...this is the description form the ebay listing".
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IntenseDak39
*GenIII*
2/29/2004
09:10:00
| RE: blow off valve
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Message:
no a wastegate is not the same thing.
while i told you that a BOV releases pressure from a closed intake tube, the wastegate is what controls the amount of boost the turbo will achieve (with other measurements set). The wastegate/actuator uses boost pressure to open a valve that will bypass exhaust from the turbine to the down pipe. Doing this will limit the amount of boost made by the turbine/compressor assembly. Internal wastegates use a pre-selected spring that will determine the amount of boost, while external will either be electronic or use spring pressure.
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GraphiteDak
GenIII
3/01/2004
00:01:01
| RE: blow off valve
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Message:
You wouldn't really hear the waste gate open and close would ya? I mean a blow off valve blows the intake pressure right to the outside.
I mean, form what I understand.
That eBay ad is full of sh*te anyway. Movie producers do NOT use those whistlers to make the cars SOUND like they have turbo's. Most of the time when you watch a movie all the sounds were added from totally seperate audio samples!!!
It always made me laugh to see a Chevy start in a movie and hear the distictive sound of a old Mopar gear reduction starter sound!!!!
Dumb ass's got to atleast get the right sound for each car. But what do movie producers know? In the fast and the furious FLAMES would come all the way down the exhasut from a engine and shoot out the tail pipe. No way should there EVER be unburned gases coming out the engine to ignite in the tail pipe! Not unless the engine was SCREWED up.
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turbovolvo
Dodge Dakota
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3/01/2004
00:29:36
| RE: blow off valve
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Message:
Haha this thread is entertaining to read, so much so that it's starting to get posted all over the internet... Anyway as someone finally said BOV's and wastegates are completely different things, with very different purposes. Blow off Valves vent the shockwave of boost that bounces off the throttle body when the valve sees sudden vacuum (off throttle) and makes a nice psssshhhh sound if your all into listening to the sounds. Sounds very similar to extinguishing a burning Dakota. A wastegate regulates boost and keeps your engine alive, but the wastegate doesn't really have anything to do with the whistling from your exhaust,that's just the turbo you're hearing. I agree that the whistle tip is very silly, as is installing a speaker system to simulate a BOV. Yes, people do this.
And I'm afraid you're wrong about the flames too, tons of cars throw flames (they just don't throw them 20 feet like in Fast and Furious...) A well tuned turbo car with no catalytic converter and a straight exhaust will throw some nice flames when you come off throttle, no questions asked.
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IntenseDak39
*GenIII*
3/01/2004
10:19:10
| RE: blow off valve
IP: Logged
Message:
anything that has flames coming out its ass isnt tuned at all. If there are flames coming out, then there has to be something in the exhaust to combust.... FUEL ....and if you have fuel combusting in your exhaust, then you are not burning it where you need it (in the cylinder).
My shelby charger i had blew one hell of a flame out its side exhaust. Fixed a vacuum leak, no more flame, lot more go.
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turbovolvo
Dodge Dakota
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3/01/2004
15:28:26
| RE: blow off valve
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Message:
The cars I'm referring will throw a flame for a reason- Let's say you're driving under 25psi of boost. If you have EFI, you're going to be in the duty cycle at this point (at least i hope so!), so your system is going to be dumping in as much fuel in as it can. Also let's say your car is perfectly tuned, so you're burning all of that fuel- good for you. Now suddenly you come off throttle. Your blow off valve or compressor bypass valve vents boost, the throttle plate is closed, and you have a very minimal amount of air going into the system. Now you must understand that it's impossible to monitor the change in air flow immediately, although it's a pretty darn fast reaction there is always a delay- i don't care if you have a MAP sensor or an Air Mass Meter, electronic or mechanical. Your injectors WILL hang open for a split second while this huge decrease in air hits the cylinders, and fuel will be thrown out and burned. End of story.
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TurboVolvo
Dodge Dakota
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3/01/2004
15:31:37
| RE: blow off valve
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Message:
One other thing that I mentioned above is that NO engine that you want to last very long should be running right at a stoich mixture. If yours is, enjoy the power while it lasts. Your EGT is going to be high, and you WILL start to burn your piston tops and possibly crack valves. Not fun. This is why open headers often throw flames, and open ports are guarunteed to throw flames. While theoretically a stoich mixture seems perfect, it just doesn't work that way in the real world. You should be slightly on the rich side.
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oh my god
Dodge Dakota
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3/01/2004
16:35:00
| RE: blow off valve
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Message:
intense dak re read the original post! Scotty DOES NOT HAVE A TURBO OR SUPER CHARGER! so he has no need for a blow off valve which is what I told him!
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IntenseDak39
*GenIII*
3/01/2004
17:41:15
| RE: blow off valve
IP: Logged
Message:
oh my god,
i was correcting your thoughts on what a BOV is for and what it does.
i do know that he doesnt need one.
a vehicle running stoich isnt gonna last long??? now i have heard everything.
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GraphiteDak
GenIII
3/01/2004
19:00:36
| RE: blow off valve
IP: Logged
Message:
The ONLY time I've seen flames come out the tail pipes on a car with NO engine trouble was when people did it on purpose. Either by INJECTING fuel and IGNITING it with a modification or like what we used to do with old Chevy's or similar with carbed engines. We would wind out 1st gear, turn the ignition OFF while holding the 4 barrels open. Once the engine wound down a bit while the car decelerated we would turn the key on. All that UNBURNED fuel that was still being metered from the carberator would THEN be ignited. A flame several feet long would come out of the tailpipe with a BANG! And after doing this repeated times the muffler would be in pieces. I actually ran into some trouble with the law for doing this. It was a small town almost 20 years ago and the loud bangs were causing people to report gun shots all over town.
I've also seen carberated cars with intermittant ignition problems do the same thing. Of course rather than the flame and explosion ON PURPOSE it would be embaressing to the driver because they didn't intentionally do it
Anyway, at the race track I've never seen flames come out of any car with a full exhaust installed. Only SLIGHT flames on open headers.
And that is rare.
If I saw a Honda Civic throwing flames, I'd say "what a piece of sh*t!"
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