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Old Oct 25, 2006 | 09:03 AM
  #1  
bennihill's Avatar
bennihill
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Joined: Apr 2006
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Default setup suggestion

i know a few people on here already know i am getting a gt for christmas. i was thinking differently on the setup. i want a supercharger so i don't have any lag when i take off but supposedly turbos are better in the long run because once the boost builds up they haul *** (and i heard they are capable of handling more hp consistently). is a supercharger/turbo setup possible? i want to have around 800 rwhp as a daily driver. i contacted jdm and they said they don't know about the setup on a stang but they said they can change out the internals so the engine can handle 800+ hp.

some guys say at 800 hp the belts tend to slip or break on s/c's but i know they are quicker off the line. the base 8 psi kenne bell intercooled runs supposedly 445 rwhp, my question is is it possible to hook up two small turbos or one medium sized turbo up and just run the air out of the turbo directly into the intake tube for the s/c? once again internals are not a problem for me as i will have them changed out when i get the car.

i was also wondering how the twin screw s/c's work if anyone knows. i was taught that a turbos' spool will only spin so fast pushing only so much air. is it the same with the kenne bell? because the whole point of my theory is so when the top end rolls around on the s/c BOOM! the turbo(s) kick in. i don't want any turbo or supercharged car out there on the streets to be able to touch this.

i do have a some mechanical experience and i can do the installs. if this is not possible then let me know and i'll stop wasting time thinking about this setup. thanks for any info guys.
Old Oct 25, 2006 | 11:22 AM
  #2  
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CrazyAl
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Default RE: setup suggestion

Turbocharger-Supercharger combinations have been done in the past, mainly on fairly exotic drag-race cars. So, it is definatley possible to do so. However, it is also extraordinarily complicated. You'd be the only guy in the world with that setup. Finding out what size/type turbo to run, and then getting everything tuned afterwards would be a LOT of work, requiring a real expert. Even well known shops like JDM aren't likely to touch that project. If you find someone that will, it's going to require some serious money up. I mean BIG. Also keep in mind that all your pumbing will need to be custom, so you'll have to find someone that can fabricate custom intake and exhaust piping for you.

Twin screw blowers work great. Like any air pump, the air flow is proportional to the speed at which the rotors turn. That's why changing pulley sizes will alter your boost. Turbochargers work the same way. The output of a turbocharger compressor depends on the speed at which the turbine end is spun (by the exhaust). You know how you can change your boost ratio on a SC by swapping pulley sizes? You can do the same thing on a turbo by changing different turbine or compressor blade shapes.

I think you have some misconceptions about both turbos and S/Cs. Go read some books on the subject.

I suggest:

Turbochargers by Hugh MacInnes (describes superchargers and combo setups as well)
Supercharged by Bell
Maximum Boost, also by Bell

...get some real knowledge under your belt and you'll know what you're getting into.


You want my advice? I know enough about turbos and superchargers that I wouldn't want to undertake a crazy project like that. My suggestion, get a turbo kit. Modern turbos have very little lag. If you don't belive me and you're dead-set against turbos, then get a twin-screw blower instead, and set up for a lower HP goal, like say, 600. Then get yourself a nitrous kit.

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