A real supercharger!
Former Moderator
Joined: Jun 2003
Posts: 18,852
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From: New York
Registered User
Joined: Dec 2003
Posts: 2,432
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From: South Jersey
You're crazy if you think a centrifugal blower for this car is better than a screw/roots style. Why pay all that money for something that gets full boost at redline? "There's 7psi, oops time to shift!". That setup above is obviously a bit crude and looks like a one off prototype. I'm sure someone could make a clean install roots style kit for this car. It also seems as though the steering column wouldn't be a problem, but I can't tell from that pic.
The Jackson chargers didn't do well because of Jackson, not because the design of the blower. Jackson didn't do the best R&D on their kits. The do sell their kits with a "Power Card" now, which does a pretty good job at controlling fuel and drivability has improved.
http://www.vf-engineering.com/images/mx5dyno2.jpg
The above is a dyno graph of a '99 Miata with a Vortech SC on it running 8psi (blue line).
http://brpforum.infopop.cc/eve/ubb.x/,s,95...ost_Upgrade.pdf
This chart is a '99 Miata with a MP62 based roots style SC running roughly the same boost as the kit above (use red line, blue line is a boost upgrade).
http://brpforum.infopop.cc/eve/ubb.x?a=tpc...75&m=2966047885
Follow this link for an 11psi/intercooled example of the same kit with exhaust mods.
The differences in low end hp and torque are amazing, while peak hp is not much different. You've got 115ft-lb at 3.5k RPM with the Vortech vs. a smidge over 150ft-lb torque at 3.5k with the roots. In fact, I don't think the Vortech ever makes more torque than the roots at any RPM. I can't see why a centrifugal blower is better for small displacement motors like these. I'd be willing to bet the S2000 would be faster with a roots style SC running just 5psi than a Vortech based kit running more boost. Why? More usable power/torque and a much more easy car to get out of the hole.
Kris
The Jackson chargers didn't do well because of Jackson, not because the design of the blower. Jackson didn't do the best R&D on their kits. The do sell their kits with a "Power Card" now, which does a pretty good job at controlling fuel and drivability has improved.
http://www.vf-engineering.com/images/mx5dyno2.jpg
The above is a dyno graph of a '99 Miata with a Vortech SC on it running 8psi (blue line).
http://brpforum.infopop.cc/eve/ubb.x/,s,95...ost_Upgrade.pdf
This chart is a '99 Miata with a MP62 based roots style SC running roughly the same boost as the kit above (use red line, blue line is a boost upgrade).
http://brpforum.infopop.cc/eve/ubb.x?a=tpc...75&m=2966047885
Follow this link for an 11psi/intercooled example of the same kit with exhaust mods.
The differences in low end hp and torque are amazing, while peak hp is not much different. You've got 115ft-lb at 3.5k RPM with the Vortech vs. a smidge over 150ft-lb torque at 3.5k with the roots. In fact, I don't think the Vortech ever makes more torque than the roots at any RPM. I can't see why a centrifugal blower is better for small displacement motors like these. I'd be willing to bet the S2000 would be faster with a roots style SC running just 5psi than a Vortech based kit running more boost. Why? More usable power/torque and a much more easy car to get out of the hole.
Kris
Joined: May 2003
Posts: 3,401
Likes: 0
From: Va Beach, VA
The Vortech is a pain to work on (tightening the belt, fighting the brackets). The root style looks much cleaner and is in a better spot to work on. It just bolts to the side on the head, there's no way to mess it up. I also like the auto belt tensioner being retained.
Now, I wanna see one for a LHD car.....
Now, I wanna see one for a LHD car.....