[Grabber523]

The roots aren't as efficient as the twin screws because they can't move the volume of air for a set p.s.i or per revolution that a twin screw can. To compensate for this lower flow potential of the roots style you have to run a higher p.s.i. pulley, which creates more heat through compression and "chop", which is what happens in over-boosted turbos and centris as well...the air inside starts to stall and shear as a result of "pushing" the air so hard that it starts to spill back out of the blower towards the intake, heating it dramatically because of the turbulence-induced friction. A screw blower doesn't need to run a high p.s.i. to get good, (relatively) cool airflow because of the way it's designed.

[Taboo]

Whipple. It's the cat's meow....

[forensicsteve]

Don't concentrate on brand names. Research the technology to decide which form of supercharger will best suit your driving habits and goals.

Remember, there is a lot of bias in opinions and with very few exceptions, a user has only had experience with his/her one type of supercharger on his/her vehicle. For example, I had a Procharger and loved it...but I cannot claim it's better than any other since I never had a KB or Whipple or Roush etc etc etc. on the same vehicle.

[catchtheroadrunner]

If you like to stop and start a lot, get a roots or screw. If most of you fun comes after you are already roling than get a centrifugal (vortex). The nice part about centrifugals is that you can skip the intercooler. I just read an article in "Building 4.6/5.4L Ford Horsepower On The Dyno". On page 140, Test 5 is a 05 Gt with different ignition, JBA LT, 2.5" collector, and F.A.S.T for air and fuel. The setup gave a base dyno of 356/392. With the SC the numbers went up to 559/513 with no intercooler. On page 148 they do a test of intercooling on a cobra with a non-intercooled Paxton. The Cobra started with 766hp/618ftlbs before interooling, and dyno'd at 687hp/563ftlbs after the dyno. The end result was a 81hp/66ftlbs loss of power due to the bends in the intercooler and the restrictions in the radiator. The article notes that the thermal efficiency of the centrifugal design helps reduce the amount of of heat generated by boost.

[1LOUDGT]

Link please. If there is a way of getting that heavy a$$ intercooler out of my car i want to know.

[catchtheroadrunner]

Originally Posted by 1LOUDGT Link please. If there is a way of getting that heavy a$$ intercooler out of my car i want to know.

It's a book. I gave all the info in the post. It's at Barnes and Noble if you want to go check out the details. I gave the page numbers.

The article says an intercooler will help eliminate detonation, but if you ask me I'd rather just retard the timing another degree. At any rate, it appears that anything under 500, on a centri, does not merrit intercooling (v8 speaking).

[05mustang_kb_charged]

the reason for the lower efficiency of the Roush and eaton is they don't compress the air in the blower housing, they compress air by forceing more than the motor can use at any given rpm.

the reason that kenne bell, saleen, and whipple have a higher efficieny is because they compress the air inside the blower housing and then transfer the compressed air to the motor

kenne bell, whipple, and saleen are known as compressor's because they compress the air in the housing

roush and eaton are known as blowers because they don't compress the air they just force more air than the motor can flow and that causes boost

[GT/CS]

I've done a decent amount of research on ATI prochargers and those things are amazing and far cheaper than the twin screws you are talking about plus are far more efficient than either a roots or twin screw, raise engine temps less, and can still make unreal power depending on how you set it up. People blab about centrifugals having a similar ramping effect like turbos but it's quite irrelevant when your car starts making serious HP especially if you swap gears. Just my opinion. Those other blowers are still sick though.

[1LOUDGT]

Originally Posted by catchtheroadrunner Originally Posted by 1LOUDGT Link please. If there is a way of getting that heavy a$$ intercooler out of my car i want to know. It's a book. I gave all the info in the post. It's at Barnes and Noble if you want to go check out the details. I gave the page numbers. The article says an intercooler will help eliminate detonation, but if you ask me I'd rather just retard the timing another degree. At any rate, it appears that anything under 500, on a centri, does not merrit intercooling (v8 speaking).

Oops thought you meant magazine when you wrote article. Thanks. I'll read it then throw it at my mechanics head.

[Pastor J]

I chose the Roush Supercharger only because I could buy the stage 3 that came with it and have a full 7 year power train warranty including the supercharger. Now if I want I can retune the car and get better performance from the SC than comes with the stock Roush tune, but for now I'd rather run a tad bit slower and know that everything can be replaced for free.

[dvf1973]

Originally Posted by Pastor J I chose the Roush Supercharger only because I could buy the stage 3 that came with it and have a full 7 year power train warranty including the supercharger. Now if I want I can retune the car and get better performance from the SC than comes with the stock Roush tune, but for now I'd rather run a tad bit slower and know that everything can be replaced for free.

see now thats what i was thinking... but i am torn...the roush sc is expeted to add 40% more hp, well thats what they claim..thats 415+ on my car,,, i think thats fine for me for now...i mean to be able to pull 1g in my daily driver is pretyamazing and it being covered under my warranty is even more so

[Pastor J]

Well, I purchased the Stage 3 package primarily to get the SC w/warranty and the suspension. I don't regret getting it at all. Of course there are other ones out there that give you a ton more horses but in all reality unless you are taking it to the track you really can't use that much more than 415 on a daily basis.


One thing that Roush offers now is "Off Road Exhaust". Very easy to install, I think it took me all of 30 minutes to change out the Roush exhaust that came on the car with this exhaust and the difference is amazing.

It gives you more of a growl and a little of the popping sound when decelerating.

[dvf1973]

hehheh ore growl.. sheesh every time i up or down every cop in the south turns their head..... i down shifted into second on a slow turn yesterday and was well under the speed limit and a cop pulled a u and followed me for quite awhile, so much for my stealth like capabilities..hehe..but yes mods are surely being entertained..i am gonna attempt to keep the whole of the car roush based if at all possible..i assume you have got a bunch of punch in your 3, so over all your happy with it...?

[Pastor J]

I'm absolutely thrilled with my Roush. And yes, you get lots of attention from everyone INCLUDING law enforcement in it. We have an unmarked Charger that is in charge of traffic enforcement in the town I live outside of. For the last three months he has followed me through town and once I met my wife for lunch and when I came out he was parked across the street and then followed me to the county line.

I've done quite a bit of mods to the car so far and will be glad to help with any questions you've got. I placed a CAI on a Roush Roadster about a month ago and I've placed a Boost gauge, Oil pressure gauge, and push button start on my car this past week.

I also changed out the front grill with one that removed the pony and brought the fog lights in closer. Plus I've added lots of bling under the hood.

Any help I can give just let me know. Maybe you can learn from my mistakes.

[SEANMD81]

dude i would go with the paxton novi sl, but then again you said you didn't wont to go with a cent. s/c. but i would listen to what forensicsteve said everyone is going to be byess to there particular way of doing things. i would sucribe to 5.0 mag. they do a lot of dyno tests on a lot of the new s/c and turbos. have fun shopping