Norge911

You be better off with a 991.2 base and adding tune to it.

adding hp to natural aspirated engine cost $$$$$ if you want more then around 30hp.

911.

Scott for being so heavy into the racing world, I would think one would have some sort of data. Maybe I am the outlier here thinking that. So when I read desmotesta's comment it made me think of the lack of data offered.... The VAG comment is really more or less directed to the Porsche vehicles, since we are on a Porsche forum.

Softronic

Well one also has to look at what data is being posted as I can say most of the dynos being shown are not actual dynos yet nice made graphs posting as them and being accepted as them when they are not. Then again most are aware that self generated dynos companies post themselves are lets say made to order in many cases, kind of like showing an air freshener generating 15hp to the wheels yet we can call it product X. You can look in the prior articles Ive done in the Panoroma magazine, Technical or others on the subject.

By the way the car shown below that won Daytona generated 480bhp... As it was a 3.8 conversion we did for Napleton Porsche.
Best,
Scott

97supratt

With full bolt ons yes you’ll make more power. Custom Cobb tune, sport or race headers, exhaust, and if you add an intake manifold you will definitely have more power than a GTS.

Here’s the thing, the X51 package or supercharger will cost you less than all those parts combined.

garfunkle

FVD sport Headers: 4,000
IPD Plenum: 1,000
FVD Tune: 1,500
BMC Filters: 200
Labor: 1,000

Total: 7,700

Exhaust(iPE): 5,000
Total with exhaust: 12,700

These are about my numbers from memory. I did my own labor but threw that in there as a line item guess. My car dynos at 370-375 RWHP on a dynapack in 90+ degree heat and about the same on a mustang dyno. It will pull pretty hard against a GTS below triple digit speeds. @ ~120+ its pretty even with a GTS. ~ 150+ A GTS breathes better and has a slight advantage; in Mexico.

garfunkle

I'll also add that the FVD tune really smooths out the dip in power when the car comes on cam. You can see this dip in a much more pronounced manner in the Cobb Tune vs FVD. This is an affect of drivability and a pretty good bump in low end grunt - as far as NA goes. [Blah blah blah turbo car tune comments here - you get much more increase on a tune with a boosted car - we know.] This changes the way the car feels and preforms much more than the numbers suggest.

desmotesta

I will look into FVD tune.. I wonder if someone has an FVD on the OFT

97supratt

I didn’t mean the IPD plenum, I mean intake runners from dundon.

garfunkle

I've talked to them about this and it all depends on how you're using your car. I think it's neat for a track car who lives at the top of the rev range and will most definitely help with top end as well as peak dyno numbers.

97supratt

If we’re trying to beat a GTS, the runners definitely help. Most cost effective route at this point is the RR racing supercharger.

AdamSanta85

If I wanted to spend the money I would do...

BMC filters, Soul long tube headers, Dundon runners and a pro tuned Cobb. That theoretically will get you high 385+whp

or RR Supercharger

garfunkle

If you are chasing power then stay away from Soul headers for the 991.1 and keep with FVD, Cargraphic, GMG or Dundon. Of course - boost is way less work to make power! Would love to experience RR one day. Soul has improved their design on the long tube headers but doesn't have much science or engineering behind that product. (this takes away nothing from their customer service or fine sounding exhausts)

pride355

When you look at the official Porsche dyno chart figures of stock 3.8 vs X51, it is weird that stock 3.8 has an almost flat power curve from 6400 rpm to up until 7400 where it peaks. It makes me think that it placed there with Ecu.
On the other hand, X51 just climbs up till 7400 rpm and the power then drops all of a sudden with the same cut-off. It may rev another 400-500 rpm if Porsche would allow but this would put it too close to GT3 terratory.

We all know that Porsche is not very generaous with hp figures it gives its cars. It is also very ridiculous for 3.8 to put less power than 997 GTS/997.2 Power kit.
Anyway, I think upper rev power of the 3.8 is locked by Ecu. GTS runs very strong from 6400 up until 7400 but has the same cut-off as stock, which makes me believe that Porsche again held back the power.

So, my belief is that with better flowing cats, a good tune can give noticeable power gains to 3.8. I don’t think an afremarket exhaust helps for power over PSE at all, though. It will just provide different sound.

pride355

By the way, check below to see how much speed I gained just with 200cell HJS cats (the headers are stock) on a 991.1 Carrera S cabrio:

AdamSanta85

My understanding is the real power is in the intake manifold once you’ve done headers/ecu. Dundon has aftermarket runners that makes big gains but are big $$$.