Updated BHP power table 2009

Raw BHP Ranking Model---------------Disp.-- Power --BHP/Liter-- Bore---Stroke GT3-----------------3.6----415-----115.3-----100-----76.4 997 S (2009)--------3.8----385-----101.3------99------82.8 997 S X51-----------3.8----381-----100.3------99------82.8 Modified* Cayman S--3.4----365------107------96------78 997 S----------------3.8----355-----93.4------99------82.8 997-(2009)-----------3.6----345-----95.8------96------82.8 997------------------3.6----325-----90.3------96-------82.8 Cayman S (2009)-----3.4----310-----91.2------96------78 Cayman S------------3.4----295-----86.8------96------78 Cayman (2009) ------2.7-----255----94.4-------85.5----78 Cayman--------------2.7----245-----90.7-------85.5----78 BHP/L Ranking Model---------------Disp.--Power-- BHP/Liter -- Bore---Stroke GT3----------------- 3.6---- 415----115.3-----100-----76.4 Modified* Cayman S--3.4-----365----107-------96------78 997 S (2009)-------- 3.8-----385----101.3-----99------82.8 997 S X51---------- 3.8-----381-----100.3-----99------82.8 997-(2009)----------3.6-----345-----95.8------96------82.8 Cayman (2009) ------2.7-----255-----94.4------85.5----78 997 S----------------3.8----355-----93.4-------99------82.8 Cayman S (2009)-----3.4----310-----91.2-------96------78 Cayman--------------2.7----245-----90.7-------85.5----78 997------------------3.6----325-----90.3-------96------82.8 Cayman S------------3.4----295-----86.8-------96------78 * My "Bolt on" Modifications are: 1. "De-snork" 2. Milltek headers & Milltek Cat Back. 3. Evo V-flow filter 4. Snapflash 5. IPD Plenum 6. BBI UDP

Putting a modified car on there even if its dyno tested is useless especially unless you dyno tested the other cars.... Also I promise you don't have a 365 BHP Cayman. You maybe got 365 or so WHEEL horsepower on a dyno which people usually write as WHP. Unless you figure you have a 400 whp Cayman with your exhaust and intake mods... Sorry to be so negative but this is just getting ridiculous on this forum.

I also think it's quite ridiculous to think that a few bolt-ons can get you to 365hp. My guess is you might get 20-30hp max if you are lucky.

Are the 2009 specs true?

Agreed, but isn't the BHP measured at the crank? Confusesesesed :wall:

Where did you get your numbers for the 2009 models?

Brake Horsepower numbers are measured at the crank by a an engine dynomometer. The only number we can measure is the Rear Wheel Horsepower number. Then you can try to convert to crank horsepower...the number manufacturers state. It is all witchcraft. A rolling race answers all questions. A modified Cayman that can pull on a Carrera S in a Youtube video is the only evidence I will accept. Maybe K-Man can find a buddy with an X-51 C2S and do a video?

Yo Yo Yo checks this out I gots a 2.7ELL Caymanight and she cranks out 245 bhp+ all my sweet mods 20+ per wheel for the de-snork mod, and I saved 100 lbs of unsprung weight by letting out 25 lbs from each of my 4-tires. My friend named Dino (close enough) said I'm putti out likes fie hundred..Juice baby! Joe King P.S Hey its Friday

I learned the hard way. You cant add claimed HP from mods together to come up with a total. I thought WHPX1.18=BHP on the CaymanS? at least I thought Ken posted that somewhere, let me find it...

None of those 2009 HP numbers are official for the Cayman or Cayman S. Now let me comment on BHP or brake horsepower - it can ONLY be accurately measured by placing an engine on a stand and hooking it up to a dyno that measures at the crankshaft. This is what Porsche dooes with each engine at the factory. When you run a car on a chasis dyno where the wheels are run up on rollers you are measuring wheel horsepower (WHP). WHP is ALWAYS less than BHP because of drivetrain losses, friction, etc. The Cayman S is rated at 295 BHP from Porsche, various dyno runs have show WHP anywhere from 250 to 280 with most being in the 265'ish range. Does that mean you can apply some math to the WHP numbers to get BHP? Yes you can apply the math but NO it may not be accurate, in fact it probably isn't, as again the only way to accurately measure BHP is to put the engine on an engine stand dyno and measure at the crank. You can probably safely say that if your car produces 318hp at the wheels like mine does, that its BHP is somewhere higher than that, but any number I throw out is just an educated guess based on factors used to make that guess. We really need a Dyno 101 Primer in the FAQ...

Sounds like Mr.Kor got it backwards.....I am now unconfused! Ken, I think a dyno for dummies would be helpful, even just to identify the different types that are used these days. I do believe that the large variances we see in HP#'s are generated from a wide array of sources. Drive train loss can contribute just as much differences as motor's, mods, fuel, altitude, humidity,temp, age of oil, tire pressure and dyno calibration just to name a few. Thinking of everything in percentages 5% would show even a bone stock CS at 310bhp, if you simply added a educated guess of drive train loss. When flying around in a Cessna you get to play with all sorts of engine mods on the fly, like air fuel ratio, EGT, cold air intake, dual ignition, carb heat, if your too lazy even carb ice. You get to see first hand effects of just how altitude and temp can affect power. The Lycoming engine is even a air cooled boxer, just like vintage Porsche and runs on car fuel or 100ll avgas.

Unfortunately based on evidence to date no one would a) read it, b) understand it or more likely c) would claim to know better.

Power is at the Engine not the wheels. My BHP is obviously calculated from the WHP on a calibrated Dyno. Its not a value that can be written is gold but it should be close, for what its worth. Some people dont like to compare Dyno form one car to another. All I can say is whatever, if its similar then good enough. A 997S on the same dyno measures a bit less than mine. The dyno operator says the drive train loss changes with power output so technically its not that accurate to use a constant % loss factor. Now as the 997S had virtually the same power less 7-8WHP then you can calculate BHP reasonably. 2009 997 power is released. The Cayman power calculates about right bases on 997 figures and agrees with info I got from a contractor to Porsche in Germany who deals directly with some of the the R&D guys.

How are you calculating this? Your blog dyno shows 303 whp. It looks like it includes all your mods. At 12% loss thats maybe 339 bhp, not 365. Where is the 365 number coming from?

I didn't have it backwards I just didn't write it very clearly. I meant that he is unlikely to have a 365 BHP car because he probably meant WHP because he probably got a dyno done or something like that. I think this guy is obviously delusional :/

So take this example: Stock 997S gave 295 WHP so thats 20% loss from 355 BHP. My CS measures 303 WHP, using 20% loss gives 365 BHP. Yes this makes a few assumptions, I dont expect it to be super accurate but it acts as a guide. Unless my calulator is delusional

It doesn't work that way. You can't say that the results of a totally different vehicle on one day yielded something ... and then extrapolate that to a totally different car using a sample size of one. For example, how do you know if that 997 wasn't a weak example? You have no true idea as to the bhp and your guessing based on comparing different vehicles. I have no idea what that number might be but by sticking that number in the chart without explaining your method of guessing, IMO, is misleading to the readers. Just my opinion.

Im using a loss of 20%. Some use a lower loss and usually that is because the WHP reading as reported by other members is even higher than mine with the same mods, so in that case the BHP back calculates to a similar value. The Dyno I used has all the Porsche correction factors built in (selected Porsche mode on Dyno). The only inaccuracy I expect is the correction is for the 996/997 transaxle and not the 987 type, however I dont expect a huge difference. I could also have taken the BHP printout from the dyno which is about the same number (365). Again other members have reported higher than this again. The point is that the Stock 997S reads about the same or just a bit under mine meaning that both direct measurements and cross checking work out about right. You can read other threads where F/Loles do direct BHP extrapolation measurements all the time. At the end of the day the 997S put down less power. As a side note I have run against several stock 997S and none are faster as yet. Suffice to say 987S/997S BHP are fairly consistant from the factory. When some people report high or low Dyno numbers it is usually a result of the Dyno measuring accuracy or lack thereof. Power jump method for 2009? DFI, thats all. Hope that makes sense. If not oh well... Next set of mods should give another small bump up. :cheers: Oh forget to mention 98 RON fuel here.

If people would like to know dyno's do not measure HP they measure torque and then there is a conversion to HP. Do not have the formula in front of me but it is a function of rpm, torque and a constant.