Supercharger w/gears

[Roxy89]

OK so I have been trying to decide on a supercharger lately and have a lot of mixed reviews between centrifugal (vortech & paxton) vs twin-screw (kenne bell). So as everyone already knows, kenne bell is better down-low and centrifugal is better up top, BUT, I was thinking, is kenne bell really better for a DD? Yes most daily driving is in the low rpm range and kenne bell makes gobs of torque down low on contrary to the centrifugal that doesn't reach full boost until about 3k rpm, but w/traction being an issue, would the kenne bell really help? Also, w/kenne bell you really can't run too much of a gear, probably no more than stock or a 3.27, but w/the centrifugal you could run about a 3.73 gear (on a 5spd). I think the gear would pretty much even out the difference between kenne bell's extra low end torque and the centrifugal's lack of it. Thus the centrifugal w/3.73's IMO would be good both on the low and high end of the rpm range. I am not bashing kenne bell's design by any means, so those who have it please don't misunderstand me. I actually have it in my choice of superchargers, but being that the centrifugals are much cheaper, i think I could get a nice setup w/the gears. What do you guys think?
:SNSign:

 

[GTOreturns]

OK so I have been trying to decide on a supercharger lately and have a lot of mixed reviews between centrifugal (vortech & paxton) vs twin-screw (kenne bell). So as everyone already knows, kenne bell is better down-low and centrifugal is better up top, BUT, I was thinking, is kenne bell really better for a DD? Yes most daily driving is in the low rpm range and kenne bell makes gobs of torque down low on contrary to the centrifugal that doesn't reach full boost until about 3k rpm, but w/traction being an issue, would the kenne bell really help? Also, w/kenne bell you really can't run too much of a gear, probably no more than stock or a 3.27, but w/the centrifugal you could run about a 3.73 gear (on a 5spd). I think the gear would pretty much even out the difference between kenne bell's extra low end torque and the centrifugal's lack of it. Thus the centrifugal w/3.73's IMO would be good both on the low and high end of the rpm range. I am not bashing kenne bell's design by any means, so those who have it please don't misunderstand me. I actually have it in my choice of superchargers, but being that the centrifugals are much cheaper, i think I could get a nice setup w/the gears. What do you guys think?
:SNSign:

If moneys not an issue I'd get a KB? Less maintainance and more durable.JMO

 

[bentley429]

What exactly are you looking to do? Just have a mild car with a blower....or? Personally when I sell my powerdyne Iam 90% sure Iam going with a S trim, overall seems to be a good blower for the street/strip, and can make more then enough boost then Iam looking for and flows great. There are many h/c/i cars with a S trim making WAY over block splitting power on a 302/306. If your just looking to make alittle more power, check out powerdyne Ive run mine for over a year now,bought it used and its fine. Saw 6 psi then I swapped out the headunit pulley and see about 8-9 with no problems at all. Just dont go over that limit cause then you'll start breaking belts, which is why I need a gear-drive unit.....Iam addicted to boost. Guess what, you'll be too

 

[gt90stang]

"would the kenne bell really help? Also, w/kenne bell you really can't run too much of a gear, probably no more than stock or a 3.27, but w/the centrifugal you could run about a 3.73 gear (on a 5spd)."

I run 3.73s with my 8psi KB and an AOD works great, and having 8psi anywhere in the RPM range is awesome on a DD.

Don

 

[Black Sun 5.0]

I just talked to a guy running a centri' blower and said he had to get rid of his 3.73's and move down to 3.55's in order to keep his rear tires on the ground. Anyone else have an opinion on that? I have to install gears in the car I picked up and originally wanted 3.73's, but now I'm a bit wary because I plan on going with an SC-trim hopefully next summer.

 

[Roxy89]

What exactly are you looking to do? Just have a mild car with a blower....or? Personally when I sell my powerdyne Iam 90% sure Iam going with a S trim, overall seems to be a good blower for the street/strip, and can make more then enough boost then Iam looking for and flows great. There are many h/c/i cars with a S trim making WAY over block splitting power on a 302/306. If your just looking to make alittle more power, check out powerdyne Ive run mine for over a year now,bought it used and its fine. Saw 6 psi then I swapped out the headunit pulley and see about 8-9 with no problems at all. Just dont go over that limit cause then you'll start breaking belts, which is why I need a gear-drive unit.....Iam addicted to boost. Guess what, you'll be too

Well for now I plan on just leaving it as a mild car with a blower. My budget can't afford more right now because I want to do everything right if I start to add more power, so I would go all out on the parts I buy. So that is why that will wait probably a couple years, but I want a nice setup for now. I was looking at powerdyne, but kept hearing horror stories about the internal belt breaking. Some were recommending a bypass valve to relieve pressure on the belt when the throttle closes, but I wasn't sure if I wanted to risk it. How much HP are you putting down to the ground w/your setup right now? What supporting mods do you have? What HP did you put down when it had the 6lb pulley?

 

[Roxy89]

"would the kenne bell really help? Also, w/kenne bell you really can't run too much of a gear, probably no more than stock or a 3.27, but w/the centrifugal you could run about a 3.73 gear (on a 5spd)."

I run 3.73s with my 8psi KB and an AOD works great, and having 8psi anywhere in the RPM range is awesome on a DD.

Don

Do you have suspension work to keep that power on the ground? Because i thought it would be difficult to get the twin-screw's torque curve and a 3.73 gear planted to the ground. Hell I thought it would be hard to get just the KB to the ground w/out supporting suspension mods.

 

[gt90stang]

Roxy89,

I'm running 275/40R17 Nitto DRs, Maximum Motorsports lower and FMS upper control arms, Transgo shift kit and 9.5" 2500 stall converter. You can't just floor it off the line on the street careful application is required. On a roll coming out of a corner it is awesome and you can get on it real hard then. Traction is the limitation but that is where I want to be.

Don

 

[Roxy89]

Roxy89,

I'm running 275/40R17 Nitto DRs, Maximum Motorsports lower and FMS upper control arms, Transgo shift kit and 9.5" 2500 stall converter. You can't just floor it off the line on the street careful application is required. On a roll coming out of a corner it is awesome and you can get on it real hard then. Traction is the limitation but that is where I want to be.

Don

True, I would love to be to the point where my limitation is traction, not the engine setup. Anyway, for now I am decided to go with a paxton novi-1000 6psi base kit. I will be ordering it soon. I would love the kenne bell, but my budget can't fit it in right now and I rarely see them for sale for our fox bodies on the classifieds. I think I will be happy w/the paxton "for now". LOL.

 

[Hi-Po]

Roxy, I went through much the same arguing when I started looking for a supercharger, but I was lucky enough to get a ride in both a fox with a KB and a SN-95 with a Vortech. I went for the KB, and I have not regretted my choice for a second!
The instant boost low down from the KB was enough for me to make up my mind as thats what I wanted since my car is basically my daily driver.
I am still running the stock rear end, works like a charm both for street driving as well as on the highway; and after all thats what you want for a daily driver, isnt it?

 

[bentley429]

Well for now I plan on just leaving it as a mild car with a blower. My budget can't afford more right now because I want to do everything right if I start to add more power, so I would go all out on the parts I buy. So that is why that will wait probably a couple years, but I want a nice setup for now. I was looking at powerdyne, but kept hearing horror stories about the internal belt breaking. Some were recommending a bypass valve to relieve pressure on the belt when the throttle closes, but I wasn't sure if I wanted to risk it. How much HP are you putting down to the ground w/your setup right now? What supporting mods do you have? What HP did you put down when it had the 6lb pulley?

I never got the car on a dyno, but other then the powerdyne the car has a edelbrock intake, 30 lbs injectors, full exhaust, roller rockers etc and a wasted bottom end. The car still rips, if your interested I might be selling the powerdyne.

 

[Allforspeed]

i've always wondered kind of the same thing about the gears

ie: what is the best gear for a 350HP or so car on pure street tires? i've been in some NA cars that made the first two gears totally useless with 3.73's, i can only imagine with a blower and a t5....

 

[MustangGT95]

I have rode in several Centri supercharged cars. And unless they had major mods they blew the tires off.

Buddy had a 1991 AOD GT with offroad h and a 9psi paxton. With the stock 2.73 gears it would blow the tires off at 45mph. It was insane.

I found a good deal on a KB so I think I will be getting it asap.