opinions: STS vs RADIX
Sep 12, 2004 | 09:25 PM
#191
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From: Chesapeake, VA
I have no real points for discussion on the values of a twin screw vs roots. I do know that if Whipple made an intercooled blower for GM trucks, I believe most would migrate to it for it's efficiency differences alone.
As to the original topic of the thread, I guess there's not much more to say that hasn't already.
As to the original topic of the thread, I guess there's not much more to say that hasn't already.
Sep 12, 2004 | 09:29 PM
#192
Originally Posted by BenKey
I have no real points for discussion on the values of a twin screw vs roots. I do know that if Whipple made an intercooled blower for GM trucks, I believe most would migrate to it for it's efficiency differences alone.
As to the original topic of the thread, I guess there's not much more to say that hasn't already.
As to the original topic of the thread, I guess there's not much more to say that hasn't already.
Sep 12, 2004 | 09:35 PM
#193
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Joined: Mar 2004
Posts: 4,632
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From: Sun Diego
What was the question again? 
Seriously, I think the consensus will be:
(1) The Radix is the most complete kit out. If you don't want to fool with anything (or much) after install, get the Radix. Because of the upgraded injectors and intercooler, you can get more out of it than the stock 5-6 psi just with a smaller pulley, but of course you will be sacrificing your warranty.
(2) The STS is new, probably has more potential, but is not complete IMO. If all you will ever want is 5psi boost, then in its present form it is probably okay. But as soon as you start wanting more, you've got issues to address, mainly injectors, intercooling, tuning, etc. You better be a tweaker if you get the STS kit.
Now regarding twin screws, in spite of the superior technology, the manufacturers of Lysolm kits just don't have their **** together in the form of a complete kit including tuning, injectors, intercooling, etc. It's the raw frontier out there as far as twin screw blowers (unless you're a Ford fan, then Kenne Bell has kits for you).
Of course, if you wire those Aussies over at Starr Performance...they'd be happy to send you a complete intake-mounted, bolt-on Whipple kit with all the goodies - for $9,800 U.S.
Seriously, I think the consensus will be:
(1) The Radix is the most complete kit out. If you don't want to fool with anything (or much) after install, get the Radix. Because of the upgraded injectors and intercooler, you can get more out of it than the stock 5-6 psi just with a smaller pulley, but of course you will be sacrificing your warranty.
(2) The STS is new, probably has more potential, but is not complete IMO. If all you will ever want is 5psi boost, then in its present form it is probably okay. But as soon as you start wanting more, you've got issues to address, mainly injectors, intercooling, tuning, etc. You better be a tweaker if you get the STS kit.
Now regarding twin screws, in spite of the superior technology, the manufacturers of Lysolm kits just don't have their **** together in the form of a complete kit including tuning, injectors, intercooling, etc. It's the raw frontier out there as far as twin screw blowers (unless you're a Ford fan, then Kenne Bell has kits for you).
Of course, if you wire those Aussies over at Starr Performance...they'd be happy to send you a complete intake-mounted, bolt-on Whipple kit with all the goodies - for $9,800 U.S.
Sep 12, 2004 | 09:38 PM
#194
Originally Posted by Naked AV
What was the question again?
Seriously, I think the consensus will be:
(1) The Radix is the most complete kit out. If you don't want to fool with anything (or much) after install, get the Radix. Because of the upgraded injectors and intercooler, you can get more out of it than the stock 5-6 psi just with a smaller pulley, but of course you will be sacrificing your warranty.
(2) The STS is new, probably has more potential, but is not complete IMO. If all you will ever want is 5psi boost, then in its present form it is probably okay. But as soon as you start wanting more, you've got issues to address, mainly injectors, intercooling, tuning, etc. You better be a tweaker if you get the STS kit.
Now regarding twin screws, in spite of the superior technology, the manufacturers of Lysolm kits just don't have their **** together in the form of a complete kit including tuning, injectors, intercooling, etc. It's the raw frontier out there as far as twin screw blowers (unless you're a Ford fan, then Kenne Bell has kits for you).
Of course, if you wire those Aussies over at Starr Performance...they'd be happy to send you a complete intake-mounted, bolt-on Whipple kit with all the goodies - for $9,800 U.S.
Seriously, I think the consensus will be:
(1) The Radix is the most complete kit out. If you don't want to fool with anything (or much) after install, get the Radix. Because of the upgraded injectors and intercooler, you can get more out of it than the stock 5-6 psi just with a smaller pulley, but of course you will be sacrificing your warranty.
(2) The STS is new, probably has more potential, but is not complete IMO. If all you will ever want is 5psi boost, then in its present form it is probably okay. But as soon as you start wanting more, you've got issues to address, mainly injectors, intercooling, tuning, etc. You better be a tweaker if you get the STS kit.
Now regarding twin screws, in spite of the superior technology, the manufacturers of Lysolm kits just don't have their **** together in the form of a complete kit including tuning, injectors, intercooling, etc. It's the raw frontier out there as far as twin screw blowers (unless you're a Ford fan, then Kenne Bell has kits for you).
Of course, if you wire those Aussies over at Starr Performance...they'd be happy to send you a complete intake-mounted, bolt-on Whipple kit with all the goodies - for $9,800 U.S.
Have I convinced no one of the Radix's off idle boost superiority?
Sep 13, 2004 | 02:37 AM
#198
Back to the original topic, radix or sts, I know there have been tests of the parasitic drag of the superchargers, but has anyone measured exhaust backpressure on the turbos? I would like to see someone dyno an sts equipped vehicle first without the turbo, then with the turbo on the exhaust, but without pressurizing the intake. Wouldn't this give an idea of the percentage HP loss because of the backpressure? I personally use a modified whipple setup, so I am only asking out of academic curiosity.
Sep 14, 2004 | 04:45 PM
#200
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Joined: Sep 2004
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thoughts?
The Twin Screw argument should be; and I may be wrong, how does the thermodynamic law help the twin scew SC overcome its greatest negative, "any Off Boost Condition", so that it equals or out performs the Radix/modified roots blower, in building off idle boost quicker.
Again, my position is, there is no way the twin screw SC can build off idle boost faster than a Radix due to the fact that it must first overcome its greatest negative to then build boost, however, once it starts to build boost it is more efficient at it. The radix, however, is a cheetah waiting to explode into a full sprint, so to speak, it is 1 step away from productive boost, while the twin screw is 2 steps. Now, can the twin screw really boost faster off idle? I say no.
The Twin Screw argument should be; and I may be wrong, how does the thermodynamic law help the twin scew SC overcome its greatest negative, "any Off Boost Condition", so that it equals or out performs the Radix/modified roots blower, in building off idle boost quicker.
Again, my position is, there is no way the twin screw SC can build off idle boost faster than a Radix due to the fact that it must first overcome its greatest negative to then build boost, however, once it starts to build boost it is more efficient at it. The radix, however, is a cheetah waiting to explode into a full sprint, so to speak, it is 1 step away from productive boost, while the twin screw is 2 steps. Now, can the twin screw really boost faster off idle? I say no.