Increasing Supercharger Whine
07-16-2006, 10:32 AM
#1
Increasing Supercharger Whine
Does anyone know of any tricks to making a Supercharged TL whine at idle? I know you guys have created the AEM mod which helps at wide open throttle. I love hearing the whistle of a SC. Its very intimidating.
How about increasing the rotor spin? Wastegate change? How about raising the boost? Better yet... what produces the whining sound (trapped air by belts?)
How about increasing the rotor spin? Wastegate change? How about raising the boost? Better yet... what produces the whining sound (trapped air by belts?)
07-16-2006, 12:31 PM
#3
The Eaton blowers have a built-in bypass valve. The whine as you call it is due to the compression of the air charge after the blowers hybrid-roots rotors. If you want it to whine at idle, you have to disable the by-pass valve. I DO NOT RECOMMEND THIS.
A-Train
A-Train
07-16-2006, 01:58 PM
#4
Originally Posted by Atrain
The Eaton blowers have a built-in bypass valve. The whine as you call it is due to the compression of the air charge after the blowers hybrid-roots rotors. If you want it to whine at idle, you have to disable the by-pass valve. I DO NOT RECOMMEND THIS.
A-Train
A-Train
07-16-2006, 02:07 PM
#5
I think I answered my own question with some research on the net:
This small valve, between the the throttle body and the intake manifold, increases fuel economy and reduces parasitic power loss. The bypass is operated by a vacuum actuator and is normally closed. When manifold pressure is low (high vacuum typical of light throttle operation) the actuator opens the valve, allowing charge air to flow from the throttle body directly into the intake manifold, bypassing the blower and equalizing pressure in the system. The bypass valve open at low manifold pressure eliminates parasitic loss in a practical sense. Magnuson superchargers running with an open bypass consume only about one horsepower. When the supercharger begins to make boost, the bypass valve snaps closed, allowing pressure to build in the intake ports.
This small valve, between the the throttle body and the intake manifold, increases fuel economy and reduces parasitic power loss. The bypass is operated by a vacuum actuator and is normally closed. When manifold pressure is low (high vacuum typical of light throttle operation) the actuator opens the valve, allowing charge air to flow from the throttle body directly into the intake manifold, bypassing the blower and equalizing pressure in the system. The bypass valve open at low manifold pressure eliminates parasitic loss in a practical sense. Magnuson superchargers running with an open bypass consume only about one horsepower. When the supercharger begins to make boost, the bypass valve snaps closed, allowing pressure to build in the intake ports.
07-16-2006, 08:48 PM
#6
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i notice all ur posting on the s/c threads invincible.....looks like someone is being ultraa 
..lol...soo ur gonna take the next step?..stopp stalling and just by the damn charger 
..lol...soo ur gonna take the next step?..stopp stalling and just by the damn charger
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07-17-2006, 04:49 PM
#8
Nope...
Acuradriver2006,
He asked...
You said...
No CAI will not effect the Eaton "whine" at idle. Eaton's are by-passed at idle at PT conditions. The whine as everyone calls it, comes from the air charge being compressed. There is very little compression of the air charge when the air is by-passed.
Eaton's do not compress air very efficiently in their housing, but rather paddle the air from inlet side to outlet. The compression of the air occurs between the hybrid-roots rotors and the intake or cylinder runners.
Twin screw blowers and Centrifugals do not act like this. They compress air in their housing. Twin screws are LESS efficient then Eaton blowers at low boost levels and low blower snout speeds. However, a twin screw reaches adiabatic efficiency (65%) around 15-psi. The Eaton M90 reaches adiabatic efficiency (65%) at 4-5 psi. At 9-10 psi it's around 50%. At 12-15 psi you're down around 40%. That means 60% is all unwanted heat.
No Cold air induction tube, pipe, what have you will increase the Eaton's "whine" when it's bypassed at idle and part throttle. Sorry it just doesn't work like that.
A-Train
He asked...
Does anyone know of any tricks to making a Supercharged TL whine at idle?
AEM intake mod will make the whine louder
Eaton's do not compress air very efficiently in their housing, but rather paddle the air from inlet side to outlet. The compression of the air occurs between the hybrid-roots rotors and the intake or cylinder runners.
Twin screw blowers and Centrifugals do not act like this. They compress air in their housing. Twin screws are LESS efficient then Eaton blowers at low boost levels and low blower snout speeds. However, a twin screw reaches adiabatic efficiency (65%) around 15-psi. The Eaton M90 reaches adiabatic efficiency (65%) at 4-5 psi. At 9-10 psi it's around 50%. At 12-15 psi you're down around 40%. That means 60% is all unwanted heat.
No Cold air induction tube, pipe, what have you will increase the Eaton's "whine" when it's bypassed at idle and part throttle. Sorry it just doesn't work like that.
A-Train
07-17-2006, 08:13 PM
#9
Originally Posted by Acuracy
i notice all ur posting on the s/c threads invincible.....looks like someone is being ultraa ..lol...soo ur gonna take the next step?..stopp stalling and just by the damn charger
..lol...soo ur gonna take the next step?..stopp stalling and just by the damn charger 
I should know by this week what I am going to do. Did you get yours?
07-17-2006, 08:56 PM
#10
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Originally Posted by invincible569
LOL! I was thinking about that and the BBK all at once. I should know by this week what I am going to do. Did you get yours?
I should know by this week what I am going to do. Did you get yours?
07-19-2006, 04:49 PM
#12
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Originally Posted by Acuracy
nahh i didnt get mine yet, been fighting not to because im debating on whether i should get rid of the car or not. Still on the fench but if i decide to keep the car u better believe im making that call to excelerate for the S/C
07-19-2006, 05:08 PM
#13
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Originally Posted by bklynpanman
get rid of the car ??!!! for what?
lol..im thinking about getting an M3..buttt only if i can find the color combo that i want but it doesnt seem to be happening. still a maybe...but if i dont get it u better believe im charging
07-19-2006, 06:58 PM
#14
do as much work to the intake part of your motor as possible. after i put in the big bore TB and PnP intake manifold, my car had a crazy vacuum sound, and i didnt have a blower.
i'd like to see someone do a Big Bore TB and PnP w/ extrude hone intake manifold, but thats pricey.
i'd like to see someone do a Big Bore TB and PnP w/ extrude hone intake manifold, but thats pricey.
07-20-2006, 06:03 AM
#15
Originally Posted by CleanCL
do as much work to the intake part of your motor as possible. after i put in the big bore TB and PnP intake manifold, my car had a crazy vacuum sound, and i didnt have a blower.
i'd like to see someone do a Big Bore TB and PnP w/ extrude hone intake manifold, but thats pricey.
i'd like to see someone do a Big Bore TB and PnP w/ extrude hone intake manifold, but thats pricey.
thats an idea. it should help the revolutions of the SC (breathe better). How much does something like that cost?
07-23-2006, 02:41 PM
#17
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