What kinda numbers are 997 's putting out at the wheels??? I read that ferrari 360's only put 320-330 stock at the wheels.... Just wondering how it would compare..

Would a 997's be able to beat a 360 from a roll...both stock cars...?

 

997 - about 280 at the wheels

997S - about 300 at the wheels

 

Some vendor sites rate them around 305-307rwhp.

 

I failed to do a baseline, but after headers, cats, intake and GIAC I only put down 318RW on a DynoJet. The problem is my PSE I believe. With an aftermarket muffler I am sure I would get a good increase.

 

As far as a 997 S being able to take a 360 from a roll, I think it would be to the advantage of the Porsche for a couple reasons. I found a test for the 360 that said it ran a 13.1 @110. I think its more of a 12.8-12.9 second 1/4 mile car around 110. The WORST test I have seen for a 997 S was a 13.0@110 with a BADDDD driver. But most of the 997 S 1/4 mile tests I have seen have been in the range of 12.5@ ~114-115. I think that if you look at 0-100 this will be the tell tale factor. The 997 S runs about 9.5 sec while the 360 Modena is about 10.5. Thats a while second difference. Also, I think that the 997 will have an advatage in weight as well as drag coefficent. This is all given that driver skill in both cars is equal, but I would give it to the 997 S.

 

Wow 318RWHP is pretty low with those mods, at least from what the vendors are quoting for power gains. GIAC claims 10-20HP, Headers and Cats 25HP, Intake 10HP. Yeah something is wrong here.

 

PSE doesn't make any power over the standard OEM mufflers, so naturally it is the restriction compared to aftermarket mufflers.

Generally I will take a tuners claimed hp increase and expect less.

 

I got a base number for my 997S a couple of weeks ago before starting down the significant mod path. I will post it later if I can find it, but the 300-310 range seems right.

 

Tuners are always using bogus numbers. Porsche, for the X51, remapped the fuel, and changed the heads, intake and exhaust manifolds, and you get an increase from 355hp to 381hp. A lot of tuners make similar claims in hp increase for headers alone. One of the European tuners made many of the same changes to the 997S as the X51 and they were only producing 375hp.

 

you can't add them up like that to get what the HP should be. individually, they may make those crank HP numbers. however, chip, exhaust, and intake don't add up 55 hp on a NA car.

another thing you should consider is peak hp vs hp at redline. that is another way to skew the numbers. you can have an exhaust that say makes an extra 10 hp for a split second, but realistically you only see 5-6 hp across the boards.

it's all a numbers game. for reference, i made around 275 rwhp on a 3.6 996. i don't think it would be unreasonable to see 305 ish on a 997S.

 

How do you know it's low?

He stated right off the bat that he did not do a baseline. There are a lot factors that could have been involved in why he put down 318.

If he did a baseline and put down 270 stock on that particular dyno, then his gains are right on point.

Make sense?

The Test #'s are worthless unless you have a base from the same dyno.

 

Just out of curiosity how much hp does the 996 Gt3 put to the wheels stock and with similar mods. Would a bolt on 997S put down the same hp that a bolt on GT3 does given the extra displacement and the restrictive stock parts on the S?

 

Different dynos put down different numbers. 318 may be a very strong number for that particular dyno. From what I remember Dynojets put down much lower numbers than Mustang.

Performance parts can be tuned for peak HP (good for racing) or area under the curve (real world driving). Without seeing a full dyno sheet on any part there is no real way to tell what they are doing. Personally I will take area under the curve any day of the week.

 

My 997s dynoed at 306rwhp when I bought it stock in 2004.

 

I heard that the B&M air filter adds 15HP. I suggest all you need to do is install one and carry and additional 9 extras in the trunk. This will give you an additional 150 HP over stock. I am sure a dyno operator can print out a graph confirming this. You may not have an additional performance on the street, but just think....you'll be on your way in winning the dyno races.