I know what the S/C sounds like (whining noise), but I was wondering exactly on how the Turbo sounds? Anyone have any audio on it?

Anyone know if its louder than the S/C?

 

I experienced my first two S/C experiences last week, the supercharger is definitely louder. At idle, there is an irritating sound like crickets or something though. I also like the sound of the Greddy BOV, too bad it leaks under higher boost.

 

psssssssssssssssssssssssssssssssst
it makes a hissing type of sound...im sure you've heard on turbo'd cars in your area.

 

A healthy turbo shouldn't make *any* noise whatsoever. An old turbo may make a whiny noise if one of the bearings is worn. If the turbo system has a blow-off valve in place, then yes there will be a PSSSHHH sound when the driver lets off the gas.

 

I think your wrong, you can make a healthy turbo whistle under boost, It all depends on whats done to the car.

 

You are right, a turbo does make noise when spooling up, even a healthy one. It depends on where you put the turbo and how good the sound proofing is on your car. Mine is pretty faint but I can hear it.

 

That's just not true.

 

I heard a turbo on a mustang once. It was an older stang with a big V8, it was hard to hear the turbo over the engine noise. I could hear it spooling tho, and someone pointed it out to me.

 

Thanks for all the replies

 

Care to share what's wrong with his statements?

 

all i know is that blow-off valves are awsome. If you get a turbo get a BOV.

 

I think you would have to get the BOV anyway, or a wastegate.. obviously backpressure is not good on the engine..

 

one day i was driving next to this jet black wrx. those things are turboed, and it made a pssshhh sound when he was shifting. i hear that in gran turismo too, that's supposed to simulate the real thing, right?

mmmmmm, it sounded so nice...

i want one.

 

I'd love to share. You will hear the turbo spooling even when it's a VERY healthy turbo. You can hear the build up of pressure and the air moving through the intake piping under that pressure. Go out and drive next to a new 1.8t in either a Jetta or an Audi A4. You will hear the turbo spool. It's the nature of the beast.

 

Correct me if I am wrong, but I thought a wastegate was what controls the boost. I know some wastegates let exhaust into the atmosphere before the turbo, but most the noise comes from the turbo spooling up or the blow off or bypass valve.
I have also heard that a bypass valve is better since it routes the air back into the system so the MAF is accounting for all the air correctly.
Also, the bov and bv let off back pressure on the turbine of the turbo, right?

 

wastegates control boost, bov's simply let compressed air intbetween the tb and intercooler escape when u let off the pedal/close the tb plate so as not to get a surge of air going back to your turbo and shocking the crap out of the turbine, at those speeds such a change is not good over n over again for the turbo, bypass valves are good for cars that use MAF's because bov's that dump to open air instead of recirculating or running 50/50 tend to screw with sensor readings on MAF cars, but non recirculating bovs dont do jack to MAP cars, and ya get the cool noise!! oh and btw hello everyone i havent posted on these boards for...years , as the i30 is no longer w/ me. but just thought id show up again as im in the market for another 4g max!

 

Ouch... sorry if my post was less than informative. I'll say this in my defense:

When I bought my '90 RX7 turbo, I could hear some whiny noise above 3K RPM, figured it was normal. Well after owning it for a while I was convinced I needed more power so I bought a Racing Beat exhaust and unknowingly started damaging my engine cuz I was running lean (pinging). When compression tests revealed that the engine was shot, they also took the turbo apart and found that it was pretty badly worn (7 years old mind you). Anyway, when I got everything repaired/replaced, got the car back and the turbo made NO noise.

An ex-girlfriend of mine had an '88 Celica all-trac turbo, man that car was a blast to drive, and guess what... no whiny turbo.

Also, I buddy of mine used to have a '95 300ZX TT, and those turbos where silent too. He has moved on to an Audi S4 (rich bastard)... haven't had a chance to ride in that yet...

So I guess there are some noisy turbos out there, sorry I generalized based on my experiences.

 

As far as noise goes, turbos don't have to be loud.
From my experience, a turbo will changw in volume with the amount of boost it is producing.
My roomate owns an Audi A4 1.8t. I have ridden in it every stage of modding he has done. At stock it was silent only producing 7psi. With the APR chip at just over 1bar on stock turbo, you could slightly hear the spool up. Now with the PES stageIII turbo kit, the spool up is very loud and the bypass valve sounds similar to a BOV.
So it all depends on the set up and all the factors in the turbo system.

 

Yeah a buddy of mine has a 91 300Z TT and you can't hear it but, the car is totaly stock, but I was up at the track one night and a Grand National Ran and all you could hear was a whistle comming from his car, BTW he let a Mustang GT get a 1/2 track length on him before he took off and he still took him by like 3 cars on an 1/8th mile, and this car was street legal. That was my first turbo experiance.

 

The wastegate simply keeps the boost from going above a certain pre-set level. The BOV relieves the excess pressure when the throttle plate is closed so that you don't damage the turbine.

 

you could just keep the old plastic one on it but i dont know why u would

 

Now let me give my spill. When I went to the track and raced this Supra w/the large single Turbo upgrade, I could hear that sucker squealing loud as hell as he try to catch me. (yes I was ahead of him since it was a young 15 yr old kid driving). Thats the only time I got a chance to hear a Turbo spool up. To hear a supercharger spool up listen very closely to this video. You can hear my SCer make a psssssssst noise as it spools up. This is a video of Baggs racing his friend. Enjoy



http://www.vqpower.com/v2/modules.ph...p=getit&lid=46