POLL: twin screw or centrifugal s/c
Thread Starter
2nd Gear Member
Joined: Sep 2007
Posts: 343
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RE: POLL: twin screw or centrifugal s/c
yeah true, this guy does know a lot about cars though, i gotta give him credit. hes never dealt with centrifugal superchargers before and hes hit pretty much everything on the head apart from that. im definitely gonna get a TS over the centrifugal though haha. the polls do not lie
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5th Gear Member
Joined: Jul 2006
Posts: 3,834
From:
RE: POLL: twin screw or centrifugal s/c
The polls are not lying....I am by no means going to belittle or downgrade the centri. I chose twin screw myself for the following reasons.
1: power and torque down low. Centri cant match it
2: the look; Centri looks like an afterthought. It just looks like you put the engine together and leftover parts and decided...heck just bolt it to the front somewhere
3: someone who said that the boost of a twin screw is more harmful than that of a centri needs to do a little more research. (No disrespect)
overall if I were to do it all over again 20 times....20 out of 20 I would go with the twin screw...but thats just me...well me and the others who chose TS here....
1: power and torque down low. Centri cant match it
2: the look; Centri looks like an afterthought. It just looks like you put the engine together and leftover parts and decided...heck just bolt it to the front somewhere
3: someone who said that the boost of a twin screw is more harmful than that of a centri needs to do a little more research. (No disrespect)
overall if I were to do it all over again 20 times....20 out of 20 I would go with the twin screw...but thats just me...well me and the others who chose TS here....
Retired Mod
Joined: Jan 2007
Posts: 7,658
From: Long Island, NY
RE: POLL: twin screw or centrifugal s/c
ORIGINAL: Briscoe
haven't ever noticed this "fallin a bit flat" with my saleen twinscrew. It seems to pull like crazy all the way to the rev limiter.[sm=badbadbad.gif]
haven't ever noticed this "fallin a bit flat" with my saleen twinscrew. It seems to pull like crazy all the way to the rev limiter.[sm=badbadbad.gif]
ORIGINAL: sawyer
A bit flatyou havn't ridden in my TS'd car. A violent thrust with barely any time to shift before redline.
A bit flatyou havn't ridden in my TS'd car. A violent thrust with barely any time to shift before redline.
vs. as an example
the centri HP is climbing faster and stronger IMO from 5000 +
my .02...
5th Gear Member
Joined: Jul 2006
Posts: 3,834
From:
RE: POLL: twin screw or centrifugal s/c
no doubt...however....look at the torque curve down low and the flatness of the torque throughout on my TS...also my HP still climbed at 5000...I need the power throughout....my only weakness with my TS is traction and hooking up well....but with the right set of DR and a couple more suspension mods as well as a TC with the right stall....and non issue...my .03 cents worth
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[IMG]local://upfiles/42783/35BB85F51E2047B5AC823366F05209B7.jpg[/IMG]
6th Gear Member
Joined: Sep 2006
Posts: 11,278
From: Gainesville, FL
RE: POLL: twin screw or centrifugal s/c
That's not a good example. Those are two different graphs and if you look at power increase from 4k-5500rpms on both you'll see th centri went from about 270hp to 380hp and the twin screw went from 300hp to 400hp. What's so different about that?
ORIGINAL: Stkjock
the centri HP is climbing faster and stronger IMO from 5000 +
my .02...
the centri HP is climbing faster and stronger IMO from 5000 +
my .02...
5th Gear Member
Joined: Jun 2007
Posts: 2,276
From: Orlando, FL
RE: POLL: twin screw or centrifugal s/c
Driving the car on the street (which I assume is what the original poster is wanting) is all about the power under the curve. T/S have power everywhere while centi are good up top. I should know I had one, (Vortech on a 99 GT), I have also driven in an 03 cobra that had similar power to my GT and it was plain better, i.e. more fun for me.
Plus what you are talking about with a positive displacement blower losing out on top end is only true for a blower that has maxed out its effieciency. I am willing to bet that you are stating this fact from articles on Lightning's and Cobra's where people are replacing pulleys looking for more power. The eatons (roots blowers) are very inefficient and they were sized to work at the stock HP level. Trying to ring out more power is only going to get you heat and little additional airflow and that is why power suffers up top. Put the right sized blower on for the power you want to make and the thing will pull like a banshee to redline.
So I will say you are sort of right, pushing a positive displacement blower past its efficiency will cause what you state. Do it right and it wont.
As a quick side note too, T/S are much more efficient than roots blowers so they run much cooler and make more power at lower boost. And 10lbs of boost is the general line in the sand to not crossuntil forged internals. With the right tune it doesnt really matter which form of FI you are using, you go over 10 lbs and you are on borrowed time. I and alot of other people can be the guinea pigs and I will let you know when 8psi kills my motor. Where are you going to be in 20 years? (j/k)
Like I said earlier both are good just amatter of how you would like your power. Its all good.
Plus what you are talking about with a positive displacement blower losing out on top end is only true for a blower that has maxed out its effieciency. I am willing to bet that you are stating this fact from articles on Lightning's and Cobra's where people are replacing pulleys looking for more power. The eatons (roots blowers) are very inefficient and they were sized to work at the stock HP level. Trying to ring out more power is only going to get you heat and little additional airflow and that is why power suffers up top. Put the right sized blower on for the power you want to make and the thing will pull like a banshee to redline.
So I will say you are sort of right, pushing a positive displacement blower past its efficiency will cause what you state. Do it right and it wont.
As a quick side note too, T/S are much more efficient than roots blowers so they run much cooler and make more power at lower boost. And 10lbs of boost is the general line in the sand to not crossuntil forged internals. With the right tune it doesnt really matter which form of FI you are using, you go over 10 lbs and you are on borrowed time. I and alot of other people can be the guinea pigs and I will let you know when 8psi kills my motor. Where are you going to be in 20 years? (j/k)
Like I said earlier both are good just amatter of how you would like your power. Its all good.
6th Gear Member
Joined: Sep 2006
Posts: 11,278
From: Gainesville, FL
RE: POLL: twin screw or centrifugal s/c
ORIGINAL: 05gtdriver
On a built motor, the T-S is very much a better choice as the forged internals(with a necessary drop in C/R) will handle the boost from a pull and will scream at the top with the proper cylinder head/cam/gear mods to maximize the T-S's boost potential. Plus the full on inter-cooled centris run about $1000-1500 cheaper than the equivalent inter-cooled T-S(forged short block money?).
On a built motor, the T-S is very much a better choice as the forged internals(with a necessary drop in C/R) will handle the boost from a pull and will scream at the top with the proper cylinder head/cam/gear mods to maximize the T-S's boost potential. Plus the full on inter-cooled centris run about $1000-1500 cheaper than the equivalent inter-cooled T-S(forged short block money?).
I think you'd be hard pressed to find anyone that threw a rod with 8lbs of boost. I'm sure it's possible, but it's usually in the upper 400rwhp range when the rods fail. 8lbs is only going to get you lower 400's on a mostly stock gt.