i have a 1990 gt convertible with a GT 40 motor in it. I'm looking for the next step in horsepower. I want to add either a Supercharger or a Blower... what do you think? plus i would like to add more horsepower... any suggestions? Thanks
remember convertibles are heavy so first I would lose some weight...go with the vortech s trim with 8 psi because it is reliable...you don't want something that is going to break and cost you even more $ to fix....when I had my 99 GT conv I gained about 70 hp with that alone....better throttle body, h pipe, headers...cam, heads would be my suggestion
a supercharger and a blower are the same thing in a sence. there are 3 different types of superchargers 1-roots. which is the typical "blower" youre refering to 2-twin screw. which is somewhat like the roots only cutting up your hood is not necessary 3-centrifugal. which is the standard and all around best form of a supercharger around.
the roots supercharger or blower as its called adds a whole lot of unnecessary weight and gives power in scattered bursts rather than a coutinous stream of power
the twin screw is a lot like the roots because they both use meshing lobes. the twin screw is slightly better but still not as good as the next
the centrifugal supercharger is powered by a turbine and is the most efficient form of the superchargers and is probably your best bet considering how little work is involved in installation unless of course you like the look of that big ass blower sticking out of your hood which i must admit looks pretty mean
and as far as the turbo thing goes they give you about the same power as a supercharger but they are a real pain to instal due to having to rip up the exhaust system and can give you lag if you get one thats too big or not much of a boost at higher rpms if you get too small of one
a supercharger and a blower are the same thing in a sence. there are 3 different types of superchargers 1-roots. which is the typical "blower" youre refering to 2-twin screw. which is somewhat like the roots only cutting up your hood is not necessary 3-centrifugal. which is the standard and all around best form of a supercharger around.
the roots supercharger or blower as its called adds a whole lot of unnecessary weight and gives power in scattered bursts rather than a coutinous stream of power
the twin screw is a lot like the roots because they both use meshing lobes. the twin screw is slightly better but still not as good as the next
the centrifugal supercharger is powered by a turbine and is the most efficient form of the superchargers and is probably your best bet considering how little work is involved in installation unless of course you like the look of that big ass blower sticking out of your hood which i must admit looks pretty mean
and as far as the turbo thing goes they give you about the same power as a supercharger but they are a real pain to instal due to having to rip up the exhaust system and can give you lag if you get one thats too big or not much of a boost at higher rpms if you get too small of one
hope that was a help
The roots does not "give power in scattered bursts" its pretty linear and its in the low end of the rpm band. (The roots type blower is what you find in the 03/04) Cobra. The twin screw (Kenne Bell/Whipple) is more effecient, makes more hp at the same boost levels and basically delivers its power in the same way. (Low to mid rpms.) And neither one of these require that they stick through your roof. (Yes there are some huge roots blowers that would, but again look at the 03/04 Cobra's or any Kenne Bell, Saleen or Roush unit, they all fit under the hood, they just replace your current intake manifold.)
The centrifugal makes most of its power higher in the power band, its real push comes at red line because its dependent on the the motor to make its power. The faster the motor spins the more boost it makes. (The roots/twin screws arent rmp dependent.) And the centrifugal does not replace your intake manifold.
A turbo makes more power than any of the superchargers and generally makes more power than the SC at the same boost levels. But they cost more are harder to install and tune. And yes the bigger the turbo the more lag youll feel. But there are ways around that or least ways to lessen this. A twin turbo setup is one way. But thats another matter all together.
What are you goals for the car, street or strip? How much horsepower are you looking for? As mentioned above, positive displacement blowers (roots, twin screw) give you power down low which makes for one hell of a fun street car. Centrifugal blowers (vortec, procharger, paxton) produces boost in the higher rpms and have alittle more HP potential. I personally would do a turbo setup before centrifugal SC on a foxbody. Both have the so-called lag, but turbos are much more efficiant. If all goes as planned, I will be ordering my Kenne Bell for the 02, maybe as soon as next week. If not I will be spraying the juice.
remember convertibles are heavy so first I would lose some weight...go with the vortech s trim with 8 psi because it is reliable...you don't want something that is going to break and cost you even more $ to fix....when I had my 99 GT conv I gained about 70 hp with that alone....better throttle body, h pipe, headers...cam, heads would be my suggestion
I concur with those that say turbos are best if you can afford it. They can get pretty spendy. I put a Garrett twin turbo set up on the wifes Excursion. Water cooled and everything. By the time I got done with the transmission reinforcements, computer reprograming, 5 inch exhaust, and all the other junk that goes along with it I dropped $12,000. That's with me doing the install. $12K in parts but that truck will fly now. For the 91 convertible we're going the supercharged route. Quite frankly, because it's cheaper.
If money is going to be an issue then go centrifugal. A procharger is more than 2000 cheaper than a Kenne Bell. And a turbo is about the same as the KB but will cost a lot more to install and get in working order. What are your horsepower goals. If the goals aren't to high I would just go with nitrous.
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Supercharger or Blower? 
