Which would be the best 4 your money when it comes to superchargers the eaton,vortech or the saleen srew driven charger. Is it true the lower the compression the better it is that is y that saleen starts with a base gt 2v 4.6 liter engine then using 4v cobra 4.6 engine. I when that the imports r using sohc vetec 2 be able 2 boost higher because of the lower compression then the dohc vetec. Does the same principle apply, lower compression the higher hp gain overall.
The lower the compression the bigger the boost you can run safely.I think thats how it goes.
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Black 2001 Stang GT with bullit rims and scoops.
Best 1/4 mile 13.5 at 107.9 mph
Mods-flowmasters,steeda lowering springs,vortech V-2 supercharger,Y2K Cobra R wing.
A stock 99+ Gt has 9.4:1 compression ratio if I remember correctly and Cobras have 10:1. 10:1 is too high to be run safely on a car but 9:4 isn't. Kenne Belle has the best supercharger in my opinion and Vortec has the best reliability.
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2008 Toyota Tacoma Prerunner SR5 Reg Cab
2.7 4 banger
No mods (yet...)
Originally posted by Monkey Boy A stock 99+ Gt has 9.4:1 compression ratio if I remember correctly and Cobras have 10:1. 10:1 is too high to be run safely on a car but 9:4 isn't. Kenne Belle has the best supercharger in my opinion and Vortec has the best reliability.
Stock 99 has 9:1 CR up to 2002 where the CR goes to 9.4 or 9.5 I'm getting old and can't remember. Cobra's are sitting close to 10:1 and I believe they are right at 9.8:1 ....
ATI and Vortech I have heard nothing but good things about. But when I install a supercharger, which is years and many mods away, I will go with Kenne Belle. How can you go wrong with someone who does almost exclusively mustangs? I've been looking at their website and they have all the CR's and all HP gains. That's what I am going with.
I have two cars. One has a vortech and the other has an ATI. The
Vortech is easier to install and work on. The innercooled ATI works
great on the street. At the track you should use high octane gas no
matter which blower you use. That takes the innercooler out of the equation. I installed the ATI on my 94 in three days. I could do it 1 day
now but I could always do the Vortech in one day. I've looked at Kenne
Bell style blowers at the track and I've never seen any of them perform
as well as a centrifical blower. Lightnings would be the only exception,
but they have much more displacement, and the ones that really go fast
also use nitrous. No matter what you install, you'll think somebondy
snuck a big block under you hood. The most important thing with the
addition of a blower is your fuel system. Make sure you have more that enough fuel. If you run a little rich you might not go as fast as possible but your motor will last longer. Good luck.
Compression is a factor when building a blower setup. The lower the better. Idealy..8.5.1 That way you can safely increase your boost. As far as comparing a roots type to a centrifical there really isn't much to compare. The roots makes great low end boost right from idle on to the midrange but a blower like a Vortech or Procharger will kill the other mid to top end and keep pulling like a mofo. I have a friend with a Kenne Bell and he hates it. Not only that he see's nothing but my taillights when we race.
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89GT
Completely built 306, Vortech S-trim
Slicks are just band- aids....try doing it on Drag Radials!!!
Last edited by blown89stang; 12-08-2002 at 01:50 AM.
The only problem with high compression is cylinder heat from the already compressed air from a 10:1 motor. Without an intercooler, you're just adding more hot air into that cylinder, and you're using fuel as an agent to cool the cylinder, much like FFW and NMRA EFI Renegade racers do with their cars. If you look at some of the combos from these guys, some were running damn near, or at, 10:1 and making in excess of 28 lbs. of boost. That's a lot of fuel needed to cool the cylinder...time to wash the rings out...and the total timing numbers of these things coming through the traps were stupid....hardly any timing...
I run a root blower. The ideal of the roots blower is that the blower moves more air than the engine can move, therefore creating boost. ie I run a 1:1 drive ratio one turn of the blow will move 671 ci air wile the engine turning at the same speed will only move 351 ci of air. A centrifical blower simply moves a large volume of air from the center of the blower outwards. It has to do this at a very high RPM(50000rpm) other wise the air form the outside of the blower will not have enough velocity to move more air out wards. That's when the air will move back to the center decreacing the amount of boost. That's why they don't tend to work a low RPM's. A good example is stirring a liquid in a glass. At low speed the liquid will move from the center and back. The faster you spin the the liquid equals more liquid moving towards the outside edge. At some speed the liquid, will not return to the center of the glass and there will be nothing in the center.
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Black,79 Mustang mostly carbon fiber/kevlar body, M-2300-k brake kit, full roll cage, maximum motorsport suspension, custom geared 6 speed, 2 inch rear fender flares, 1 inch front, motor being built (no eta). Looks like the Mad Max interseptor and weighs about 1800lbs w/o motor (450hp 351w installed to move the car around)
Black, 82 Capri RS 5.0L, B303, 1.7 rockers, World 180 heads, +150hp N.O.S, Turbo coupe rear end, T-56(tremec tko would be beter), 80 cobra nose
compression 4 superchargers 
