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I have the ECS with a Novi 1500 and would also highly recommend it. It has many advantages that I will list below, but I want to explain a little about the P/C marketing.
Now first off, I think P/C makes some good stuff. The F1 is the benchmark for "street" centrifugal blowers IMO. With that being said - P/C and their dealers will tell you that you can get a blower for your car at about $6k. With this configuration, you are getting the P1SC blower, a tiny intercooler, and a bypass valve setup that leaks air when closed and under boost. This configuration had problem never been sold, as people end up buying the Stg II air to air intercooler and the upgraded blow off valve. This configuration would be the absolute bottom basement setup one should consider as it has the proper amount of intercooler for 12-15lbs of boost, and it is not going to bleed off that boost as it has a capable blow off valve (that standard PC bypass valve thing is not very good). Throw in black powder coat for everything (so it doesn't look like garbage in a year) and you are looking at $7400 before any kind of tune (PC only has a canned tune for the very bottom basement configuration).
And at this $7400 price you are getting the P1SC - which is plenty reliable, but is really at its max output at about 650hp (however you can go up to D1SC for another $250 - which I would highly recommend). So $7650, then budget $500 to tune.
The ECS kit is kind of a weird setup - it is a Vortech mounting system and is the same mounting setup that Vortech uses in their kit, however the difference is the blowers. The Vortech uses their V3-Si blower, which is a bit of an upgrade to the P1SC that P/C uses (1150cfm), but if you buy the kit from ECS, it gets a Paxton Novi 1500SL (1450cfm / 850hp) blower.
The advantage here is that with the smaller blowers, they can hit that 700+ mark, but they only flow that air when they are at their absolute peak RPM. You really won't feel the power until 5000RPM on up. The D1SC from P/C will come on a little lower, the V3-Si lower yet, and the Novi 1500 even lower again. The Novi 1500 at 9lbs of boost will make 700whp with room to grow, and will come on crazy hard at 4000rpm.
Now - to talk about the advantages the ECS kit has is that the mount is bullet proof, easy to install and work on, but the big advantage is the belt setup. See, the P/C uses a big long belt that goes from the blower all the way to the crank, with a long arm tensioner to keep it tight. This setup is known to slip at 8-10lbs of boost, so they recommend going to their 10-rib belt setup if you plan to do any "real" kind of boost, which adds $400 to the bill ( we are now over $8000).
The ECS kit uses a jackshaft - on one side of the jackshaft is a 6 rib pulley that is driven by the stock accessory drive. Though it is only 6 ribs wide, it wraps the belt around about 70% of the pulley, so it has more actual belt to pulley contact than the 8 rib setup on the P/C. On the front side of the jackshaft there is a toothed pulley that uses a Gates belt (like a chain) that goes to the blower. This setup is WAY more efficient, has much lower belt slip, is more adjustable as far as speed goes (you can change any of the three pulleys to change boost).
Beyond this - the ECS comes with a really good intercooler (it is a larger I/C than the upgraded P/C Stg II air to air), and comes with a real blow off valve that is capable of 1000hp standard.
So is it as cheap as the bottom basement ProCharger setup? No. However it is much cheaper than the ProCharger configuration you "should" buy.
$6400 gets you the ECS / Vortech kit, the Novi 1500SL blower, a good intercooler and a good BOV standard in a powdercoat or polished finish. You install the kit, and either find a local tuner to tune it for $500, or work with Doug at ECS (a forum member here) via email to tune it remotely.
With the P/C tune you have to send your ECU in to them, and it comes back in a week with a crappy tune.
Regardless what power level you are looking for, the ECS kit is a much better buy with a great amount of room to grow. It will out perform the P1SC setup at 7-9lbs of boost (and come on with more power in the mid range). You can add LT4 fueling and go to 10-12lbs of boost and make 700hp, of go to 14-15lbs and try and hit 850hp like I am.
As far as upgrades - you can get a Novi 2200SL blower (this is like the P/C F1X) which can do 1200hp all day long right from ECS for like another $700. But if you start with a 1500SL, you can get it upgraded to a 2200SL by changing the housing and impeller out to the 2200SL parts. And all the Novi head units can be upgraded to oil feed from self lubricating (that is what the SL means) to oil fed, and then you can spin them another 4000 - 5000 rpm and get another 3-4lbs of boost.
There is even a guy out there who offers a billet impeller for the Novi head units that will flow more air (15% more air out of a Novi 1500 - from 1450 to 1650cfm)
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