In looking for performance upgrades for our cars there are only a few option (intake, headers, tune) and in reading various posts, I saw mixed results. As I navigated the options over the last couple of months I wanted to capture the stats and share my upgrade path. With the disclaimer that your mileage may vary... overall I gained a calculated 25 HP peak at the crank or 340 vs 315 stock. Included below are dyno charts and the numbers in detail. I also did some before and after 0-60 and 1/4 mile runs.
I choose to install the IPD competition plenum with 82mm TB, Fabspeed sport headers 200-cell cats, Cobb access port and a ProTune from FabSpeed and K&N air filter. I left the factory cat-back exhaust as-is, most show little improvement in HP/TQ and I wanted to avoid exhaust drone as I drive the car on the street occasionally and to/from the track.
The car is a 2011 Cayman S PDK with 78K on the clock and completely bone stock. All of the Dyno runs were performed at National Speed in Richmond VA. Recently opened, National Speed has a climate controlled dyno room that supposedly adjusts for humidity, temp etc so runs on different days are more comparable? There shop is very cool and all the guys are gear heads and easy to work with. If you're in the Richmond area I recommend (no affiliation). The baseline and final runs were performed three months apart. I installed all of the performance parts except the headers. I had my local shop (Lufteknic) install them and put a set of fresh spark plugs in.
Here are the measured performance stats before any performance mods
Average of 4 runs using Launch Control
0-60 4.77 sec
1/4 mile 13.04
After IPD and Headers, Plugs, and Air filter (no tune)*
0-60 4.40 sec
1/4 mile 12.41
0-60 4.09 sec
1/4 mile 12.07
* all of these runs on the same day were at low temps (45 F) and I had issues with wheel spin at launch and it took about 10 runs each to get the 4 good runs. This to say, if I could keep the wheel spin down I may have been able to get below 4.0 and 12 sec on these runs.
Dyno Chart, three runs. Baseline (3 months prior)-yellow, Performance Mods no tune-red, and with Pro-tune-blue (same day). 93 octane from the same top-tier station. Note how the Mods without tune shows a marked reduction in HP & TQ below 5K RPM. I'd read several posts where only hardware were installed and resulted in worse performance. I think this shows without a ProTune, the investment in parts is not fully realized. Also note the baseline run shows 286HP peak at the wheels. I think this number is high, in fact I'll assume all of the numbers are higher then they actually are. So better to compare % increase rather then raw numbers. Otherwise 286HP with a rough 18% drive train loss = 337HP at the crank and 308 = 363 and I'm not buying that.
Peak % Increase Results
Performance Mods no tune 5%
Performance Mods w/protune 8%
Calculated [email protected] 315*1.08=340HP
IPD is a quality product. I'd give it 4.3 out of five stars. The casting in some areas on the outside seemed rough and the install instructions were awful! There is a much better guide on planet-9. Time to install, 4-5 hours. Pay attention to the vacuum lines its confusing, double check 3 times cut once! Or, you will be out at your parts store looking for 3mm hard vacuum line. Buy some small angle picks or you will break plastic stuff.
Top quality, material and welds, exact fit, sound is perfect. 5 stars. Wife approved and just throaty enough to let you know something is not stock.
Cobb Access Port
I'm a tech guy and so the access port itself and the software gets just 3.5 stars. Mostly because I expected more based on cost. Yes it does what you need it to do. I like the performance measurements and I can now monitor oil pressure on the car. But for the cost.... I expected more. Still buy it again mind you. Side note I bought the PDK option also but having trouble with it. Need to flash PDK controller with PIIWIS to get it to work. I plan to post about this in another thread.
It was a simple and easy process, connect Access Port, collect data, fill out form and email to FabSpeed. Wait two days, get tune in email. Done!
The combo of intake, headers and tune definitely wake the car up. It's more responsive and the seat of the pants feel is great and the numbers support this. At about $6K was it worth it? Yeah I'd do it again. While just 25 peak, you have to look at the whole power band and it makes a difference. First track date is end of March so as long as I don't burn this car up like the last one I'll post an update.
Questions I have??
Is the mid-range dip in power something to live with or could it be improved with another round of tuning?
Is there something in the graphs that look wrong or should be corrected?
Fuel Air Ratio is decidedly different on the protune. I assume this is a good thing (not too lean?).
Hope this helps others looking to improve performance. K