I was favoring the S/C because I assumed I would get lag with a turbo kit. Having not driven the a turbo kit or a s/c kit I had nothing to base this on other than that the Porsche TT, despite being a twin turbo, doesn't really kick in until around 3,328 RPM, so I guessed a single stage would be more pronounced. Someone on here posted about driving their turbo and how when merging into tight rush hour freeway that boost can be a force to be careful of. I also felt it would allow me more flexibility with my exhaust, but what sold me was I found one in the box unwrapped on eBay for a great price.

 

Geez, tell me about it! I just got my mufflers gundoed, then swapped them for iPE, put in a B&M Short Throw, Dension unit, Laser Interceptor and now, while its in the shop thinking about 200 cell cats to get the iPE's to sound right!

 

Thank you! I'm looking forward to it!

 

Hey, I think I just answered the why I decide on a S/C question a second ago. The estimated at the crank sea level 997.1 HP is 355 and up here in Denver the altitude brings it down to around 290. I am expecting with the S/C to be around 400, which will more than compensate for the altitude decrease in HP. I will have it dynoed when done and will talk to the guys for the rear wheel HP relationship to the crank. I didn't dyno it before, just didn't have time. I'm hoping the shop has Dyno records on a 997.1 S at altitude, but at least I will know where it ends up!!!

 

Definately!

 

You KNOW it's going up to the BuckSnort!

 

Just heard from Velocity Motors, yesterday they installed lower supercharger bracket and the new injectors (I understand that is a tough part of the job) and they have A/C lines routed! I try to post some photos.

Here is what TPC Racing had on the sea level at the wheel HP comparison on stock and S/C a 3.8S. They experienced 110 HP gain and 125 torque gain. I am curious if my gains, in nominal numbers, will be higher due to the altitude and placing on forced induction....

Anybody know the calculation of what 413.8 HP at the wheel is translated to at the crank? I see that the at the wheel stock HP is 304.5, that's 16.58% less than the stated at the crank stock HP of 355. So if I take the at the wheel S/C HP of 413.8 and gross it up by 16.58%, I get 482.4 at the crank S/C HP. Does that calculation make sense? It does not seem right because that would be only a 69.6 at the crank HP increase.



Here is how nicely TPC packages their stuff:


Very organized with a parts checklist, an install guide and install CD.

 

Don,

Assuming that wheel HP is 304.5, like you said, and OEM crank HP is @ 355, you got ~ 16% drivetrain loss. Applying that to S/C wheel HP as shown on the graph from TPC, that puts you @ ~482 HP @ crank. That's a 127 HP increase @ crank from stock, not the 69 HP that you mentioned.

 

That's right! I wasn't basing it off the 355! Thank you! I can live with a 127 more ponies!!

 

Check your PM.

 

I would guess a lot depends on any preexisting conditions of your motor, bearings and all. Most people believe that a moderate FI at 4-5psi is not causing motor into danger zone still you are adding good 100 horses on top of what stock motor was designed for. You are definetely reducing available resource of hours to next failure on a motor with this but in practical world it all really depends of original motor condition.
Enjoy it while it lasts and keep an eye on a temperature gauge.

 

I respect that concern and the potential that I will be burning the candle brighter than it was designed to be was one of the issues I reconciled in the decision. And my answer, be it right or wrong, is the 993's, the 996's and the 99'7s have all had forced induction kits applied to their naturally aspirated engines, but no where could I find threads, let alone an outpouring of threads, claiming these kits caused damage or where the owners regretted their decision.

I suspect that the percentage of owners on the forums is relatively small, but probably statistically signficant. (LOL, that only means 5%). But I suspect the percentage of owners that place a FI kit on their cars and are also on the forums to be significantly higher. So for me unless I see data, it is a unproven wive's tail.

 

Sweet ride btw i think cattman had a his 997 supercharged idk if hes still on the forum but he would deff know alot about it. From what i remember he loved it. I also knew a guy who had a 997s supercharged my ooo myyyy what a diffrence in power! Car was a animal! Good luck to you and have fun!!

 

For what it's worth I put over 40k miles on my E46 M3 and I was running 6.5 psi with no problems. I think you'll be fine at the psi you'll be running. Looking forward to your progress.

 

Definitely want to hear your thoughts once it's done and in months to come. All the best.