Superchargers
05-21-2005, 03:46 PM
#4
1st Gear Member
Join Date: May 2005
Location:
Posts: 88
RE: Superchargers
Ive never owned a twin screw, or roots type blower, but ive heard that in the 4.6, the power curve seems to nose over pretty bad in the midrange. I know ill be sticking with a centrifugal type like the Vortech.
05-21-2005, 05:58 PM
#5
I ♥ Acer
Join Date: Apr 2005
Location: San Diego, CA
Posts: 1,939
RE: Superchargers
ORIGINAL: nitrojunkee
... but ive heard that in the 4.6, the power curve seems to nose over pretty bad in the midrange.
... but ive heard that in the 4.6, the power curve seems to nose over pretty bad in the midrange.
There was another thread on this a few weeks ago... I'll see if I can find it.
05-21-2005, 06:08 PM
#6
I ♥ Acer
Join Date: Apr 2005
Location: San Diego, CA
Posts: 1,939
RE: Superchargers
ORIGINAL: don_w
There was another thread on this a few weeks ago... I'll see if I can find it.
There was another thread on this a few weeks ago... I'll see if I can find it.
Look especially at the following (Post #16 by Birdieman)
ORIGINAL: Birdieman4
I have owned and tuned a centrifugally blown car as well as a twin screw car. I have had a lot of time in both cars. The biggest reason why I say go twin screw is because of the much fatter powerband. A centrifugally supercharged car's hp is directly dependant to its rpm. A twin screw car isn't. Because the power comes in A LOT sooner in a twin screw car vs a centrifugal car, it makes it very streetable but very fast at the hit of the throttle. What I mean by that is you can haul *** all day in a twin screw car and never exceed 4000 rpms. In a centrifugal car, your big power starts at 4000 rpms. You get the power where you need it with a twin screw for the 4.6 motor- down low. But, you also get it in the mid to high range as well. With a centrifugal blower, you get it up high. As most peole with centrifugal blowen cars do, they add really short gears to help keep the car's rpms up high all the time. It makes the car less streetable. With a twin screw car, you can run taller gears and still get through your rpm range very quickly. I like having a freeway car, gear wise. -My personal preferance. The twin screw allows you to be able to have the best of both worlds.
I have owned and tuned a centrifugally blown car as well as a twin screw car. I have had a lot of time in both cars. The biggest reason why I say go twin screw is because of the much fatter powerband. A centrifugally supercharged car's hp is directly dependant to its rpm. A twin screw car isn't. Because the power comes in A LOT sooner in a twin screw car vs a centrifugal car, it makes it very streetable but very fast at the hit of the throttle. What I mean by that is you can haul *** all day in a twin screw car and never exceed 4000 rpms. In a centrifugal car, your big power starts at 4000 rpms. You get the power where you need it with a twin screw for the 4.6 motor- down low. But, you also get it in the mid to high range as well. With a centrifugal blower, you get it up high. As most peole with centrifugal blowen cars do, they add really short gears to help keep the car's rpms up high all the time. It makes the car less streetable. With a twin screw car, you can run taller gears and still get through your rpm range very quickly. I like having a freeway car, gear wise. -My personal preferance. The twin screw allows you to be able to have the best of both worlds.
05-21-2005, 07:00 PM
#7
1st Gear Member
Join Date: May 2005
Location:
Posts: 88
RE: Superchargers
Thanks DonW, your car is absolutely gorgeous by the way.
I heard that info on the twin screws by a local guy that strictly does mustang performance, but ill see what hard evidence if any I can find to back it up.
That last post makes good sense, the only thing I dont agree with is the statement that centrifugal type blowers dont come on until 4k rpm. In my experience with them, the usual rpm range for it to really hit hard was between 2500-6500. Of course twin screws are always in motion so the power band starts earlier. Anyway, ill try to see what I can dig up to prove validity to my prior post.
I heard that info on the twin screws by a local guy that strictly does mustang performance, but ill see what hard evidence if any I can find to back it up.
That last post makes good sense, the only thing I dont agree with is the statement that centrifugal type blowers dont come on until 4k rpm. In my experience with them, the usual rpm range for it to really hit hard was between 2500-6500. Of course twin screws are always in motion so the power band starts earlier. Anyway, ill try to see what I can dig up to prove validity to my prior post.
05-21-2005, 07:30 PM
#8
I ♥ Acer
Join Date: Apr 2005
Location: San Diego, CA
Posts: 1,939
RE: Superchargers
ORIGINAL: nitrojunkee
Thanks DonW, your car is absolutely gorgeous by the way.
Thanks DonW, your car is absolutely gorgeous by the way.
ORIGINAL: nitrojunkee
I heard that info on the twin screws by a local guy that strictly does mustang performance, but ill see what hard evidence if any I can find to back it up.
That last post makes good sense, the only thing I dont agree with is the statement that centrifugal type blowers dont come on until 4k rpm. In my experience with them, the usual rpm range for it to really hit hard was between 2500-6500. Of course twin screws are always in motion so the power band starts earlier. Anyway, ill try to see what I can dig up to prove validity to my prior post.
I heard that info on the twin screws by a local guy that strictly does mustang performance, but ill see what hard evidence if any I can find to back it up.
That last post makes good sense, the only thing I dont agree with is the statement that centrifugal type blowers dont come on until 4k rpm. In my experience with them, the usual rpm range for it to really hit hard was between 2500-6500. Of course twin screws are always in motion so the power band starts earlier. Anyway, ill try to see what I can dig up to prove validity to my prior post.
05-22-2005, 12:08 AM
#9
I ♥ Acer
Join Date: Feb 2005
Location: Texas
Posts: 3,225
RE: Superchargers
ORIGINAL: nitrojunkee
Ive never owned a twin screw, or roots type blower, but ive heard that in the 4.6, the power curve seems to nose over pretty bad in the midrange. I know ill be sticking with a centrifugal type like the Vortech.
Ive never owned a twin screw, or roots type blower, but ive heard that in the 4.6, the power curve seems to nose over pretty bad in the midrange. I know ill be sticking with a centrifugal type like the Vortech.
05-22-2005, 02:33 PM
#10
5th Gear Member
Join Date: Oct 2003
Location:
Posts: 3,020
RE: Superchargers
quote:
ORIGINAL: Birdieman4
I have owned and tuned a centrifugally blown car as well as a twin screw car. I have had a lot of time in both cars. The biggest reason why I say go twin screw is because of the much fatter powerband. A centrifugally supercharged car's hp is directly dependant to its rpm. A twin screw car isn't. Because the power comes in A LOT sooner in a twin screw car vs a centrifugal car, it makes it very streetable but very fast at the hit of the throttle. What I mean by that is you can haul *** all day in a twin screw car and never exceed 4000 rpms. In a centrifugal car, your big power starts at 4000 rpms. You get the power where you need it with a twin screw for the 4.6 motor- down low. But, you also get it in the mid to high range as well. With a centrifugal blower, you get it up high. As most peole with centrifugal blowen cars do, they add really short gears to help keep the car's rpms up high all the time. It makes the car less streetable. With a twin screw car, you can run taller gears and still get through your rpm range very quickly. I like having a freeway car, gear wise. -My personal preferance. The twin screw allows you to be able to have the best of both worlds.
ORIGINAL: Birdieman4
I have owned and tuned a centrifugally blown car as well as a twin screw car. I have had a lot of time in both cars. The biggest reason why I say go twin screw is because of the much fatter powerband. A centrifugally supercharged car's hp is directly dependant to its rpm. A twin screw car isn't. Because the power comes in A LOT sooner in a twin screw car vs a centrifugal car, it makes it very streetable but very fast at the hit of the throttle. What I mean by that is you can haul *** all day in a twin screw car and never exceed 4000 rpms. In a centrifugal car, your big power starts at 4000 rpms. You get the power where you need it with a twin screw for the 4.6 motor- down low. But, you also get it in the mid to high range as well. With a centrifugal blower, you get it up high. As most peole with centrifugal blowen cars do, they add really short gears to help keep the car's rpms up high all the time. It makes the car less streetable. With a twin screw car, you can run taller gears and still get through your rpm range very quickly. I like having a freeway car, gear wise. -My personal preferance. The twin screw allows you to be able to have the best of both worlds.