Turbo Spool Sound?
The turbos should not make much of a different sound, as long as they are the same. Someone may have put a noisy blow off valve on the louder one. Did it make the sound you are talking about when you let off the gas or when you accelerated? I drove my friend's SRT-4 when it was brand new and it did not make much sound. It was quite a bit louder after he put in the blow off valve.
Is BOV for the intake or exhaust?????
BOV will sound like a "PSSSHT" sound when coming off the throttle. Turbo will make a high pitched whistling or spooling sound.
Turbo back exhaust?
Depends which noise you're looking for. If you want to hear the induction whine an intake is the answer(big debate on intakes but you are interested in noise not performance), you'll also be able to hear the stock BPV quite well. If you really want to hear some serious turbo noise, try a rotated turbo with a pod intake, my GT35R HOWLS. If you'd like everyone else to hear the whine of hot side of the turbo, a nice catless TBE is for you, as an added bonus you can shoot fireballs out of the back(mine does). As yours isn't a USDM STI I can't comment on a manual boost controller, personally you're better off getting some aftermarket engine management and just setting the boost target higher, and tuning for it if you want more boost, like a Hydra FTMFW. When I change boost I make the whole map dog rich, up the boost, then tune with a wideband. Simply adding an MBC is risky to me, the idea of going lean makes my willy shrivel. Headers on a 2.0L are a bit subjective, you WILL lose some low end power due to heat retention, but the top end you gain is pretty happy. Funny how the ignorant like to give you a thumbs down. I have owned a 95 Impreza L with Spec C transplant, a 330whp PE1820 powered WRX Wagon and now a 438whp GT35R powered STi. It is obvious some of the folks here have no idea what they are talking about and just prefer to give you a thumbs down, like the pimpinin guy below. Oh and for the guy talking BS about buying a crawford block, why would you stick with the same displacement if you are going with built block, especially an aftermarket one, it is cheaper to just go with a 2.5L bottom end, and you get more power out of it. Also look up "crawford bobblehead" before you even think about one of Quirts blocks. Also the compression ratio of a wrx motor makes it hell without the turbo this pimpinin719 monkey doesn't know how butt from a hole in the ground there is no way in HELL his motor makes 300hp without the turbo. I have .5l more and setting 100% wastegate duty cycle, it doesn't even put 200hp to the ground. And 20lb boost turbo???? what BS, psi has NOTHING to do with HP, flow does. Like a GT35R running 22psi will flow FAR more than a PE1820 at 22psi, but the PE1820 will spool up much quicker. There's no need to be a liar Pimpinin719.
What cause the turbo on my isuzu kb 280 to produce whistling sound even on driving below 40km per hour.?
turbos are exhaust velocity driven. the turbine portion is directly in the exhaust flow. you hit the throttle and the engine is going to end up with increased exhaust velocity/volume and the turbo is going to start to spool up. It may not produce any noticeable boost but it'll still spool up and make that familiar noise.
What causes the popping sound in the exhaust of some high performance automobiles?
High-performance vehicles are dumping a lot of fuel into the engine to make all that power. When the driver quickly lets off the throttle the airflow is affected faster than the fuel flow, so for a moment, there’s still a lot more fuel than air going to the engine (i.e., the air-fuel mixture is very “rich”). This isn’t ideal for combustion and some fuel is left unburned because there’s insufficient air to get a good burn and that excess is passed into the exhaust manifold. It’s still extremely hot though and if the exhaust is free-flowing enough (another factor that high-performance vehicles are likely to have) then it will hit air while still hot enough to ignite and it will ‘pop’.Modern cars generally don’t do it unless they’re modified for 2 reasons:1> Direct-injection fuel systems react to fuel delivery changes just as fast as air changes, so you’re not running too terribly rich at any point, even on deceleration.2> Emissions control systems generally put enough barriers into the mix that by the time exhaust reaches a point where it finds more clean air to help it ignite, it’s cool enough not to do it. For the most part, if you have catalytic converters on your car (and any unmodified vehicle will), unburnt fuel will have a hard time making it beyond this point because the heat inside the catalytic converter will cause the fuel to ignite there (and drastically limit its life).
Would it be dumb to hook up an automatic car like to put turbos exhausts and stuff like that?
I don't know exactly what you mean but some automatic cars have turbos, and if you want to modified the turbo exhaust, you can do that to relieve more back pressure, so that the turbo can spool faster. If you have a car that is not equipped with turbo, it is possible to modified but it cost a lot of money, What I mean is, the engine oiling configuration of engine equipped with turbo has a different oiling compared to non turbo engines. Other parts are also better due to higher torque pressure produce by the engine during piston firing. This of course to includes pistons, valves, engine head gaskets, and connecting rods bearing clearances, etc. In other words, turbo engine parts and accessories differ from none turbo engines. Not only that, the engine computer is also different because of extra parts needed to monitor the turbo such as boost, chips to control boost and fuel, etc... Transmission is also stronger due to higher torque from the engine. So if you have money, you can do it, but why not buy a car that is already equipped with turbo and all you have to do is modified it once the warranty is already expired? I owned Buick turbo cars, and yes I modified some of the components like bigger turbos, 4 inch turbo down pipes, 4 inch dual exhaust pipes, alcohol injection, bigger intercooler, better chips, modified suspension to include air bags(both right and left coil spring) box in lower trailer arms, V rated tires, soft compound brake pads, line lock, and too many to list... Car runs as low as 12.30 dipping to 11's but I don't want to put roll cage on my car. So I leave it to low 12's. So if you have a lot of $$$$$ the answer is YES, nothing is impossible, done it for 27 years since I bought my turbo cars...
How do I enhance the turbo sound in my car?
I've heard some very nice Gti's lately out when I'm cruising. Coming from somone who has a TT Cobra and WRX TR, it really is simple. First off, if your turbo has a silencer ring (which I doubt it would but wouldn't hurt to check) take it off. The silencer ring is a big rubber circle that just deadens the sound and is usually located right around the compressor inlet. But these are typically found on diesel turbos such as Borg Warners, Holsets, etc. My WRX has a Cobb Ram Air intake, and my turbo is very loud granted its a 20G. Also I have a 2.5 so the displacement of the engine would make a difference in how loud the turbo is because of more exhaust gases being pushed to spool the turbo. I'd say invest in a decent size downpipe, a Hi Flow cat (help with the tone of the exhaust), and just the rest done at some muffler or machine shop where they just bend and weld a straight pipe for you. Also invest in a basic intake. No need for a cold air intake and all that piping. My intake is maybe a foot long at most without the cone on it. And that made a significant difference. My Cobra on the other hand just screams. A blow off or bypass valve wouldn't change the sound at all. But on the other hand, the more boost (pressure) you run, the louder a blow off or bypass valve will be. And a wastegate just decides at what exhaust pressure does the turbo start to spool due to a certain spring rate (7lb wastegate spring should theoretically make 7lbs of boost from your turbo).So short intake, silencer removed from turbo, and free flowing exhaust. That's really all you need