Dog, I am with ya on that one. I am over in Apollo Beach and to get to this meet to see everyone I'd have to get up at 5am....not gonna happen!

 

The real test of the mods is to somehow do back to back run's on the drag strip....however that would be impossible for most all of us. There is a Saturday run what ya brung event over on Hwy64 at DeSoto Raceway if you are interested. Anyway....have fun with your mods as that is what really counts I guess.

 

Rear wheel horsepower and crankshaft horsepower are often confused. 16 to 17 percent loss is a typical figure for drivetrain losses. A corresponding figure for all wheel drive is 20 percent. 355 cshp(stock claimed power) x .83 =295 rwhp. 386 cshp x .83 = 320 rwhp. This looks like 31 cshp or 25 rwhp.

 

adbullah I wouldn't be suprised if you saw about 28rwhp or so from headers, cats, muffler, programing, plenum and intake... Seen it with my own eyes Whoever said 30hp from the ECU though is on something

 

sharky you're the man I have been waiting for your post you have worked on a lot of porsches but it was just wondring if these numbers are correct I would get 400hp

 

I just saw the pix of your car man... wow... You've made a really unique whitey that's for sure Enjoy it!

 

I agree with Sharky on those numbers. However, you're more than halfway to a blower at that point. Add some money to your budget and you go from 30hp increase to 125hp increase. You're probably looking at around $6k for all that stuff plus install.


Correction, EVO's stage package for the "S" is $6700 plus labor. Add the plenum in and you're around $7700 plus labor. Just to keep it simple, let's just say $8K for the whole setup including install. EVO says 40hp for their stage 4 package. I can't tell if it's crank or rear wheel. Got to assume it's crank since they didn't say otherwise. The EVO supercharger seems like a no brainer at that point considering you're picking up triple the HP (again crank) for less than double (should be $13K installed) the stage 4 package. I know what I'd do The turbos definately have a better bang for the buck when it comes to tuning. The NA cars just don't seem worth it to me.

 

That was my error. I read your previous post incorrectly. I thought you were comparing the base line rear wheel to the modded crank hp. My mistake.

When I did my B&A dyno for the headers, the suncoast headers picked up 25 rwhp max, and about 10 rwhp peak.

When I did my B&A for the plenum, I picked up around 10 rwhp peak. I think the max was a little high but I can't remember.

These parts make power for sure, I just couldn't feel it.

 

The cost, installed, of the aftermarket engine parts I used was about $7500. This is around half of the price for a supercharger kit: $12000 parts & $3000 installation. Double the cost for more than three times the gain.

There are a few other issues, however:
-Manufacturer's engine warranty is void with the blower. Of the normally aspirated parts, the only possible warranty gripe is the ECU reflash.
-For the money involved, you might as well buy a turbo. It would only make sense to install the supercharger on a car that you already owned and had significant sunken costs in, not as a planned upgrade.
-You will not be able to recoup any of these expenditures in reselling the car and may have to take a loss relative to the typical used car price. Unless you plan to keep the car long term, the blower installation doesn't make sense.

 

$3K sounds kind of high for the install. I paid less than half that.

Yes, the warranty is voided. But as you mentioned, depending on the dealer, they'll probably give you crap about the flash as well if there is a major problem.

We had to have a cab and the turbo cabs weren't available at the time. Not to mention we purchased our car used (two years old) and it was almost $40K less than the sticker price with around 8K miles on it. So I am considerably under the cost of a new turbo cab with the same or better performance.

I have no intentions of trying to recoup my investment with regards to the supercharger. It's a mod. You are lucky if you only get pennies on the dollar back. If that..... It's money out the window.

I'm not sure I understand your owning the car for long term comment. I don't think spending 8K on parts for 30hp is any more practical, especially if you don't plan on keeping it. You won't get your money back on those either. To each his own. For me, If I'm going to spend thousands of dollars on mods, they either better look cool as hell, and if it's performance related, I damn sure better be able to see it translate on the street. Spending 8K and beating a stock car by .2 seconds hardly seems worth the money. However, just the sound improvement on the exhaust is worth every penney.

You spent 8K and there will be a barely perceptible difference on the street. I spent 13K and I literally run away from chipped/exhaust 997S's. The grin factor easily makes it worth it to me. Red Blurr watched me walk a modded 997S over and over on the highway. Money well spent

 

Putting on a supercharger on a engine designed to be N/A (ie comp ratio and piston design) has to be very negitive on reliability and longevity. I know this to be true in the marine industry but there engine are rebuilt every 250hrs. Only time will tell....

 

I could be wrong, but I don't think it's really an issue. There are some very high mileage supercharged cars running around there now, with no issues. I have yet to see anyone with engine damage (knock on wood) as a result of the blower. Suncoast was telling me about a guy that tracks the crap out of his SC'd car, with zero issues.

I think the beauty of the centrifugal supercharger system is that for the most part, there is no additional load on the engine. I have a data logger that measures boost, AF, etc and I have made many trips where I never even see positive manifold pressure. If you're not mashing the right pedal, it runs the same as a stock car. The TPC SC'd cars may make more bottom end and be slightly faster, but it would seem like they're putting more of strain on the engine even when you don't need the power.

There are hundreds of EVO cars out there. I would say at this point the reliability is good. They've been out long enough where you'd be seeing these issues, if there were in fact going to be issues. The EVO kits are very conservative running extremely low boost. I'm lucky if I see a 6 psi spike when it's 50 degrees out. It's typically runs around 5 psi. And you're only seeing that 5psi at WOT and redline. Highway onramps usually only yield 2.5 psi. If you're easy on the right pedal you can ride around in vacuum pressure. Not to mention the IC system is very efficient. I've datalogged intake temps and it's not much higher than ambient when rolling down the highway. Detonation is not an issue either. My car drops into the 10's at WOT. There is easily more room for higher boost or a custom tune. It runs good the way it is and it's operating on the safer end of the spectrum.

 

A lot of people (myself included) don't want to do a blower, we want to stay naturally aspirated. A blower is not just a few thousand more. The cost of the kit is an easy 6-7k more than a avg. bolt on. I only paid a total of $3k for my exhaust the install I did myself, a EVO intake $600 and software $1k for a total of $4.6K, more than $6k cheaper than a blower kit without the install.

If I wanted a blown car I would have gotten a Shelby GT500 and build a car that made 700rwhp without breaking a sweat for just $4k. For those of you who chose to add a huffer to your car, enjoy it...I bet it must be sweet. It's just there are a lot of us guys who want to stay NA.


Dave

 

This is true on the street, but if you ever seriously track the car the blower will add a ton of heat and I bet heat soak sets in. This is common for even cars that are designed for forced induction.

Dave

 

I was comparing it to the same mods as the other poster.
Here is EVO's stage 4, which does not include the plenum (around $1000) or install (I have no idea but I would guess it would be around 5 hours):





Price: $6,695.00 USD




Nothing wrong with wanted to stay NA. As long as you realize that you've picked up almost no real performance gains for you money over a bone stock car. Well, other than the way cool sound

Another thing to bear in mind that the blower on the Pcar doesn't change the way it drives. It's just faster. Cars like the Shelby, well, they drive a blown muscle car.

Here's the SC kit for the 997S. Figure around $1500 for install for someone that knows what they're doing.





Price: $11,900.00 USD

Evolution Motorsports along with the collaborated efforts of VF-Engineering and GIAC bring you the world’s finest OEM Quality Vortech V2 Centrifugal supercharger system for the 997 S. This package includes everything needed to make a naturally aspirated Carrera compete with the performance of a 996 Turbo. Our system is a true bolt-on kit that requires no major modifications to the car. This supercharger system adds 120 horsepower and 75 torque, while still maintaining factory reliability and drivability.