I noticed on this forum that the Stillen Supercharger is only running 5.6 boost and getting about 308RWHP while the ATI Procharger is running 7 boost and getting about 375RWHP.

Does anyone know why stillen's boost is running so low, and how hard it is to crank up the boost. Will the stillen supercharger ever be puttin out 375RWHP??


Thanks

Sean6tt

 

Do a search on Goggle and look for the ATI procharger webpage and then read every part of their technical data on SC'ing, it is very informative. What they state is one of the key evils of FI is heat and because the ATI procharger has an intercooler, that are able to reduce heat thus able to increase boost which gives you more hp. There are other risk factors of FI so read a lot of threads too. Good luck and pm me if you have more questions after you do some searching, if i can, I will answer your questions....Jeff

 

Also, they are different type of superchargers I believe. The procharger is centrifugal and stillen's are usually screw type.

 

Well, that's a multi-faceted question, with many likely answers that only Stillen really knows right now. We've had some pretty decent discussions on here about both systems...try a search. It's very simple to raise the boost with an SC, all it takes is a pulley. I would imagine that the twin screw-type SC that stillen is using would be able to support 375 rwhp, but I have my doubts about about the way that they are giving the engine fuel. I doubt the provided fuel system with their kit could safely support that amount of hp to the wheels.

 

If you go the Stillen route and actually wanna modify upon what they already got... like someone mentioned earlier, an intercooler will definately add to the netted hp. But if I do actually end up going with Stillen, I will definately change out the pulley to a higher PSI rate of around 10-12 psi (engine will be strengthed as well for street reliability). Of course though, when I actually get around to it, I will have to justify the added pains and costs with modifying the Stillen system as opposed to any other supercharger system that may be out there such as ATI, etc... I am currently going towards stillen for the instant powerband gains rather than the time it does take to spool up under engine load. Just a personal preferance

 

Although I don't like the need for a new hood (I don't like the optional add on hump) I do like Stillen's approach they have a less expensive SC, w/o IC, but at the current levels they also provide a 3 year ENGINE warranty not just SC warranty and you can probably upgrade with them as they develop more.

 

The biggest disadvantage of the stillen sc seems to be the fact that it is a positive displacement type supercharger. By nature the positive displacement SC runs hotter. If your goal is all out power your money would be much better spent on a turbo instead of modifying a the stillen. For ease and reliability the procharger seems to be the best option for SC.

 

I just can't justify buying any FI w/o an intercooler, westpak. I don't think the engine will last w/10.3:1 CR. I remember the heat from my engine bay with 8.8:1 CR and IC. I wouldn't take a chance, even with their engine warranty.

 

There is an ENGINE warrenty? What are the details of that?


I look at it this way. The Stillen, on the surface seems a lot cheaper but with the hood, take a look:

One thing to think about, and these numbers are VERY rough, but if you look at HP gains from the Stillen kit vs the ATI kit:

Stillen 250 RWHP stock goes to 300 RWHP for $3795.00 (NOT counting the $700 for the new hood)

ATI Procharger (in the same stock car) goes from 250 RWHP to 370 RWHP for roughly $5000.00

So, with Stillens kit you gain 50 HP for $3795 = $76/1HP

If you add the cost of the hood (which you HAVE to have to use this kit) it goes up to roughly $4500 so now it's $90/1HP


With the ATI kit you gain 120 HP for $5k=$41.6/1HP

 

I don't know the details but this is from their website:
We have recently received approval from Dell Financial Group to offer their extended warranty. This will allow limited coverage of the engine for 3 years or 36,000 miles as an option. This approval was granted after extensive review of our engineering designs and independent testing of the unit.

In the near future we will be adding optional parts and tuning levels to this kit. There will be parts such as intercoolers and tuning modifications to increase horsepower, torque and operating efficiency. These parts and modifications will be offered for "Off Road Use Only" and their use will invalidate any CARB certification. All foreseeable options will be sold as upgrades to the existing kit.


But your cost benefit definetly favors the procharger so I guess you would have to weigh the engine warranty vs power added and also how much cash or credit you have available, because you could reduce Stillen by just cutting the hood and adding their scoop instead of a whole hood plu some of the pricing I have seen is 3695, so you could be around 4000 but for 900-1000 more the 370 HP sure sounds good.

 

If the Stillen kit runs hotter w/o an intercooler, how could anyone think its a good buy? Also, how could anyone think it will be more reliable, because it has a warranty? Do what you want, I wouldn't pay Jesus Christ a dime for a kit w/o an intercooler. They are rushing development on their kit to try and ace out the Procharger by saying they will add an intercooler and other pieces later? Their website says your warranty from Nissan will be gone when you add the "upgrade pieces" to their kit.

Bonz, this is not worthy of consideration until they have a complete system we can examine, I wouldn't touch it.

 

If I got the Stillen,I'd have to get the intercooler & pulleys which will send me well past ATI's cost, & close if not more hp.But if I got the ATI, I think I'd have to get a modified plenum to deliver fuel properly,knowing the front cylinders arent getting enough air.I also think valve springs and injectors could be upgraded for both systems.Saving a buck or two is cool, but buying one or the other for hp/per$ isn't my way of finding the right deal.I'm more into instant hp that is reliable and made for an everyday driver,no matter what the cost.I figure I've already saved $$ by not buying a Porshe.

 

My $/HP isn't the bottom line in chosing a kit by any means. I just threw it out there for perspective.

And Boomer.....did you read the bottom of my sig?

 

Si, Patrone! Easy choice, can you say thrown together for the unamed?

 

Twin screw SC's heat the charge air less than rotor/roots type SC's (both being positive displacement). Twin screws typically have high adiabatic effeciency as well as high volumetric effeciency, and Stillen's SC running at such a low psi..... Unless the screws are tiny (they look to be a decent size from the pics), I would expect the charge air to be relatively cool.

 

adiabatic effeciency???


Whoh, better go get out my thesaurus!

Doesn't that have something to do with High Blood Sugar or something???

 

Adabatic effency is a measure of how effectively a compressor compresses air.
In and ideal world when you compress air, the temp rises. Let's call that temp increase A. However the real world is far from ideal, and not all compressors are equeal. The adabatic effency is a measure of how much the temp rose above the ideal min. A. A higher percent adabatic effency means a less heat is created for a given boost level.

 

It's low for two reasons for sure. 1. It's not intercooled yet and 2. They want to provide a nice warrenty and keep it very conservative and very safe.

 

In my ideal world, air temps WOULD NOT rise under compression...and beer would be offered in 80 packs.

 

Whatduyou mean the front 2 cyls aren't getting enough air?