987.1 Dynojet and Mustang Dyno results.

The following the mods are on my 06 Cayman S - 3.4L 2006 Cayman S 83k miles IPD PLenum with GT3 throttle body (82mm) PCS Innovations High Flow Intake Milltek Cat-Back Exhaust Stock Headers Both Dynos completed with an outdoor temp of 72 degrees on the same day. After the Plenum, Throttle body and the PCS innovation High flow intake the car feels and runs very strong! As of right now I think I am going to go with the EVOms RS350 Tune Package and then Re Dyno the Car on both Dynos to see what the gains are. I am not going to lie when I saw the Mustang Dyno numbers i was very disappointed. Mustang Dyno 242.4HP Dynojet 274.79 I am not sure what a good guesstimate is for the crank power but if anyone knows how to do the math please feel free to hook me up I would like for everyone to chime in and let me know what you guys think on the numbers the Cayman produced! Tune will be coming soon! I will keep you guys updated. Follow my Instagram for more updates @Dope_987

You would have needed baseline, stock run values before any of the mods for it to really tell you much. Its not about the actual number as you can see they can vary from one dyno to the other. Its the percentage value of change between baseline values and the modified runs that count Many people claim great butt dyno results with bigger plenums and TB upgrades only to be saddened when they discover that the actual dyno data doesnt back it up and in many cases the car lost HP and torque down low where its really needed. Tunes can help to bring things together and regain the performance, but at the end of the day the most proven and long established power gain mods on these cars comes from aftermarket headers with high flow cats and a tune and not much else unless you are willing to spend thousands more for "maybe" 2-5HP more at 7K RPM These cars are not air starved and plenums and TB changes are worth only a couple HP all the way up at redline, and thats assuming you have a tune to tie it all together and haven't actually lost power as a result of the mod. People dont seem to realize that making the TB bigger reduces the flow velocity of the air just like removing your thumb from the front of a garden hose and the water is suddenly not moving near as fast any longer. They just assume "bigger is better" ignoring the fact that Porsche is already using these same smaller TB on other cars that already produce more HP than these cars ever will You will never really know the true performance gains if any in your case without the stock baseline run. You car typically has about 260 HP at a wheels in stock form, so according to the Mustang you are down on power from stock, and you are up on the Dynojet , however you did not gain 10+ hp with nothing but a plenum/TB mod on stock headers . No one ever shows gains like that with that mod even with headers , so the real values may be somewhere in the middle between the two dynos, which if true unfortunately puts you right around the stock 260. Your car has nearly 90K miles on it, so this may actually be pretty good

IIRC, wheel HP loses about 15% from crankshaft numbers; so 240 at the wheels is about 282 at the crank. The data I had for a 2007 CS is 295 at the crank, so you've lost 13-ish in 14 years. My take is that is pretty good. Bolt you on some cat less (or reduced) headers and smile! Joe Henley

I agree with you I never thought about getting a stock dyno done! I did a clutch job on the car and then realized I had massive vacuum leak so I replaced most vacuums hoses and then I started replacing allot of parts like the Plenum and so forth. Its crazy how much difference a dyno makes! the mustang Dyno has the two rollers and the Dynojet only has a single Roller. I wonder what number the Cayman would put down on the other type of dyno that bolts onto the rear wheels.

Hey Joe so 240 at the wheels is about 282 at the crank then 274.7 at the wheels would be 315.9 at the crank. I would rather go with the Dynojet number obviously but i wonder which number is actually more accurate to what power the car actually has.

So I just did some research online and the internet says that the Dynojet is more accurate since it calculates HP by the weight of the roller and the rotation. So since the internet does not lie I am going to go with the higher number

My motor makes 496bhp on an engine dyno and 446whp on our chassis dyno. That's 11% but every chassis dyno is different..

I've heard for Porsches the difference is between 11% and 13% drivetrain loss.

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Joshua, Do you guys offer tunes for 987.1 ?

Honestly, those dyno charts aren't that useful. I'm a bit biased because I used to work there, but just as an example, if I were having my car tuned/tested with mods, I'd want a dyno chart that looks more like this one: Granted, it was easy to do these runs back to back because it takes less than 10 minutes to reflash the tune or go back to stock, but it's pretty clear what is happening to the vehicle and exactly what the result of the modifications did. The only thing missing on this graph that I'd like to see as a customer is the exact temperatures, for example the ambient temperature in the room (dyno was indoors but not air conditioned area) and perhaps the engine coolant or oil temp pulled off of OBD at the start and end of each run. I was there for the 2018 run and I remember - vaguely - something like 85°F inside the room with a big 6x6' fan blowing on the vehicle, coolant was 220° or so on the hot runs or somewhere thereabouts. All info that is important to have. I've yet to find a good detailed, calibrated dyno result for most of the common 987.1 performance mods and honestly I don't think there is very much room for improvement on these engines without going to forced induction of some kind. I think that's part of why we don't see a lot of data, it'd be a lot harder for places to sell aftermarket 987.1 parts if you showed a clear dyno chart that it barely did anything, better to obfuscate the information to keep the sales going. Edit: I should mention, no affiliation, that @arcflash above me has great dyno charts with no hidden bs. That's great!

Video of my dyno pull today: https://www.planet-9.com/posts/2252100/ Result: