Turbo Spooling sound

[BlkBird]

This could very well be the biggest NEWB question to ever grace these forums.
But I just wanted to double check something. I recently got rid of my N/A talon, and got a TT 3000GT. Now, I hear the turbo spooling up to about 3,100RPMs....maybe more. I'm not entirely sure. But after that, its all engine. The car pulls like nothing i've ever driven. So I assume everything is in order. But I was just wondering if I'm suposed to hear the "turbo whine", "spool" all the way to redline. Or, just untill the turbos spool. Again, I'm sorry for wasting anyone's time in asking this ridiculous question. But I'm new to this turbo thing, and I'm trying to learn fast. Thanks for any information at all.

 

[draxus83]

you should have bought my car !!!!! but what kinda sound is it making ??? there are a few diff in sound try to be a little more detailed

 

[BlkBird]

It's exactly like the sound I hear when I drive any of the turbos cars, off the car lot where i work. Like "ssssssssssss" only hear it under throttle. and I get blow off, so there's boost. I'm just not sure if one of my turbos isnt spooling, or working. Simply because the "ssssssss" stops at a certain RPM, maybe the RPM when the second turbo is suposed to come into affect. That is the way a Twin turbo works, correct? I'm trying to do research. But the only good source of info is 3si.org and you have to pay to be a member. That's not cool. So i just figured some DSMtuners could help me out. haha

 

[Generation1JeY]

twin turbo does not work like that, twin turbo works where u have two small turbos to spool up very fast to eliminate turbo lag.

In that case at high rpm u wouldnt hear the turbo as much because its not accerating spooling because it already reached its set boost point so the wastegate is doing its job and getting rid of exhaust gas, which is another reason why u cant hear it because the engine and exhaust are just a lot louder at high rpm.

I know exactly what ur talking about because my car does it extremely loud, i dont even need a bov or boost gauge to tell me when i'm boosting, u cant miss the sound of the turbo spooling its just a loud alternating whistle.

 

[BlkBird]

twin turbo does not work like that, twin turbo works where u have two small turbos to spool up very fast to eliminate turbo lag.

In that case at high rpm u wouldnt hear the turbo as much because its not accerating spooling because it already reached its set boost point so the wastegate is doing its job and getting rid of exhaust gas, which is another reason why u cant hear it because the engine and exhaust are just a lot louder at high rpm.

I know exactly what ur talking about because my car does it extremely loud, i dont even need a bov or boost gauge to tell me when i'm boosting, u cant miss the sound of the turbo spooling its just a loud alternating whistle.

Thank You! How you described the Twin Turbos working is exactly what I thought when I first got the car. But then, after checking stuff out on the net, it got me all side ways. But it's nice to have it cleared up. Thanks again man

 

[draxus83]

umm thats not how it was describe to me !!!!!! there reason for t/t from what i am told (i have no esp with t/t) but the "biger" turbo picks up where the smaller one left off to reduce lagg got to www.howthingswork.com look there it might help

 

[Generation1JeY]

i'm not sure how exactly the twin turbo works as in terms of how its set up. but i do know its very common on v6 and v8 just because there is 2 exhausts, so basically u get a custom intake mani, 2 intake pipes, 2 good exhaust manifolds, and 2 small turbos and u can provide each side with a good ammount of boost. Now it will spool very fast since its 2 small ones running on serperate exhausts, but on a v6 it only has 3 cylinders to provide boost with so its quicker.

Now even though they can support high pressures, it doesnt mean they are supporting those pressures as effeciantly as just 1 giant garret would, thats why u dont see twin turbos in dragsters, because though theyre quick they just dont provide the best ammount of pressure as effeciantly as 1 giant compressor fan would.

I happen to like twin turbos a lot just because its sexy having two intakes and makes the engine looks cool, but also because i'm not huge on racing so i would love to have to have a daily driver that spools to full boost at 2k rpm

 

[TheTSiGuy]

The idea that a smaller turbo spools up and then a larger turbo kicks in , is the sequential setup. just a heads up. not all TT cars utilize it.

 

[blcknspo0ln]

www.3si.org these guys love 3s' as much as we love DSMs

 

[thefisl]

There are 2 ways to do a TT setup.
1. Parallel: where two turbos of the same size (usually kinda small) are hooked up and boost at the same time and frequency. (3000 GT & 300ZX I believe use this setup)

2. Sequential: where two turbos of different sizes are hooked up in series. The first (very small) is used to sort of "help" the second turbo (a lot bigger) spool up. This setup virtually eliminates turbo lag, because most of the time you will be using only the smaller turbo. (This setup was created and perfected by porsche and is still used today. The Supra also uses this method.)

 

[olmytsi]

i think yall r missing his point...he wonders if u r suppose to hear turbos spool all the way to redline and the answer is no. turbos are loud while spoolin but once its spooled u shoudlnt really hear it. so ur car is fine....