Craig Mack said:Roots/Twin Screw superchargers are "positive displacement" blowers, and make X amount of PSI (full boost) by a certain RPM. They build boost fast, and at a low rpm, so they give more tq then centrifugel blowers, and can carry that "full boost" that hits low all the way to redline, or close to it, depending on the efficiency of the blower.
Centrifugel superchargers boost building is RPM dependant. Building them with more aggressive internals can spool the boost faster, but doesn't change their overall characteristics. They generally produce no power below 2000rpm, unless you are running an insanely small pulley. They are, however, much more efficient than your typical roots blower, meaning they love making lots of PSI, where as a positive displacement blower heats up real fast and can only make soo much boost. Centrifugel blowers reign supreme over all other superchargers on the dyno as far as peak HP is concerned. These types of blowers are ideal for the track, because of the smooth power delivery and the fact that they keep on building power as the rpms increase.
I've had both types of blowers on my old Maxima, both a Vortech SQ trim V1 blower @10psi, and an Eaton M90 roots @8psi. The Eaton had more punch down low, but ran out of steam around 5500rpm, where the Vortech shined.
Anyways, theres my .02.
White360RFnSwee said:Bottom Line.. Twin Screw doesnt give as much upper RPM power as the Centi.. Centi make boost all the way to 8000 rpms with these carss
I would check the Kenne Bell web site for more info.40th Sonic GT said:Hey, thanks for the replies. I'm looking at a Procharger now. Their website says high 11's for a stock '02 GT with only exhaust mods. 8 psi I think. Thats relativly safe.
kirkyg said:misconception #1...twin screw and roots are the same type supercharger & twin screw is positive displacement. NEITHER is true. Twin screw is the best of both worlds.
Jordan_J said:No, not to be a dick but they are actually different than each other, the roots uses fan type things to push air in and creates a lot of heat, but twin screws use "screws" and they are intercooled. If I would go with any I would go with a twin screw myself. The Saleen blower is a Whipple supercharger which is only using about 8 psi. If you were to get a higher psi verison, you'd make as much or more power than a the other superchager types, plus you'd have the power instantly.
I did not have it dyno tuned. This is KB tune. My first run the dyno I saw 373 rwhp becuase there was in issue with my speed (shaft) limit. I reported the results back to KB and they sent ma new chip to fix the problem. With the new chip I'm at 398 rwhp on the power mode and 418 on the shootout mode. I have the switch chip by the way.drexebo said:hey el_kid... did you have your stang dyno tuned when you got your kit? if so or if not, what was the baseline run w/ your kenne bell kit and chip before you got it to 418 horses?
Pretty impresive number00s281sc368 said:Mine made 433rwhp @9psi on 91 pump gas with the standard KB chip. I haven't seen yet a Vortech or Novi that gives as much HP and torque for the same boost.
The KB twin-screw is the best for low end power and high end power as well.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?