After tuning the engine on the World Dyno, Mitch worked with us in cleaning up low end driveability a little and tuning the launch control.
Our results in tuning our Cayman were nothing short of amazing! Our 9A1 engine went from 300 whp to 354, that’s 54 more whp! Torque went from 251lb/ft to 288 lb/ft, an increase of 37 lb/ft! These are huge gains for a naturally aspirated engine. The power gains are across the board with peak gains in power and torque of 80 hp and 80 lb/ft in some spots in the powerband. This is an amazing amount of power gain and goes with the theory that Porsche intentionally corked up the Cayman to keep it under the 911 models.
Mitch had done some tuning on a late model GT4 Cayman and had its baseline dyno data. Getting close to the GT4’s power with our project was one of our goals but as you can see here we have easily surpassed the GT4! Our project is a whole lot cheaper than a GT4! Unfortunately the GT4 also responds very well to mods and can easily make a lot more power than our car but a stock GT4 is no match for our Cayman S!
Our tuned car is amazing, it is so much faster and more responsive to throttle input. The PDK transmission now shifts harder and faster. Our launch control was previously bog and slip now lets the car leaves the line at 6000 rpm and smoothy engages the clutch, putting the power down efficiently. The stock 9A1 engine runs out of steam at 6500 rpm and the power falls quickly. Our engine pulls hard to the 7500 fuel cut and screams like a GT3 Cup Car. The way our car feels is reminiscent of the 997 3.8 liter GT3. It really sounds like it too!
After studying other modded Caymans, ours has the best top end of any dyno charts we have seen and the major difference is the Dundon intake manifold runners. Our car is the only 3.4 liter engine running the Dundon runners and we have proved that they are a viable mod for the 3.4. Our car is the most powerful 3.4 liter that Mitch has tuned and the most powerful dyno chart we have been able to find on the net for a naturally aspirated 3.4 liter 9A1.
Now with our engine matching the performance of our suspension and brakes, we will be next working on the bodywork with some functional aerodynamics from Verus Engineering!
26 comments
The 9A1 is just an incredible motor. Simple breather bolt-ons (albeit expensive ones) and tune have you well past 100whp per liter. That motor is literally make the same power per liter as the 4.5 liter V8 from the 458 Italia. Such an underappreciated engine.
I think this is the record for us as far as NA bolt ons go.
Cost? 0-60 before and after? Would love to know
All the suppliers are listed in the many articles we have linked. Dyno results are better than 0-60.
I’d guess it has to be sub 4 seconds on a good surface. PDK and over 400hp in a ~3000 pound package.
Bring it to Laguna and I’ll set a lap for you. We can even use the tires off my 987.2. 🙂
Nice job, in the video are you shifting manually or letting the ECU do it?
I shift manually, except for upshifts on straights at 100% throttle, where the car does it for me automatically. The 987.2 PDK is very good, but it’s not perfect so there are a few short moments on every track I’ve been to where it’s better to go manual. The 981 PDK shifting logic is much better, and I didn’t mind letting that car do all the shifting for me.
Your car puts the power down very well at the corner exit! I was impressed by how early and how much you were able to get on the throttle.
The car is set up pretty well, and the tires help of course. One guy with a GT4 refused to believe the engine wasn’t tuned because with a good exit, my car and a GT4 are about even below 90ish MPH.
What tires are you running?
The 1:38.3 was on new R7s that I was trying for the first time. 37s definitely possible. I can do low 1:40s on NT01s, and 1:41s with PS4S. With aero your car is going to be crazy fast.
1:38 is fast for that power level of car! Awesome job.
In the video where you had the transmission failure, are you running any additional cooling for it?
Unfortunately no, other than the 3rd center radiator. The air temp was 57F and the coolant temp was 214F at the time of failure. Only within the last few months did I discover that transmission temps could be a problem, and I was considering adding cooling over the winter… now I’ll be replacing a transmission and adding cooling. 🙁 I’m going to at least get a larger PDK cooler, but I’m not sure which of the other items I’ll add.
Did you see how we added a larger oil pan too? Your temperatures don’t seem too out of line. Do you know what failed in the transmission? Do you think the transmission could have starved due to oil slosh?
Indications are the gear position sensor failed. I think it was due to heat but we don’t really know, and Porsche actively makes it difficult to find out. I wish I had access to the gear oil temperature.
I did see the larger pans (thanks for the awesome in-depth articles btw). I think I’m favoring a second cooler for the transmission oil right now.
Wasn’t the 3.4L 9A1 rated at 320 hp in stock form?
Thats 320 hp at the crank, a dyno typically sees about a 15-20% loss through the drivetrain. So our engine is making about 400 crank hp.
Impressive results ! Thanks for putting in the work to get it dyno tested.
For the baseline run of 300hp and 251 ft/lb in the first graph, is that stock ? If that’s the case it looks like there’s very little drivetrain loss (6.5%) from the crank figure of 320hp. With the mods and putting 354hp to the wheels, it looks like it should be around 377hp at the crank which is almost in the GT4 territory.
Also, in the second graph, is the dotted line with 302hp and 255 ft/lb supposed to be a stock GT4 or is it the stock Cayman S?
Stock GT4 on this dyno.
I’d just like to point out a mistake in the article – “Our 9A1 engine went from 288 whp to 354, thats 66 more whp! Torque went from 251 lb/ft to 300 lb/ft, an increase of 49 lb/ft!”
The torque actually went from 251 to 288 ft/lb (increase of 37 ft/lb) and the hp went from 300 to 354 whp (increase of 54 whp)
I realized you were right when I looked at the chart that I read the numbers at the bottom wrong! All fixed.
To be fair, the stock GT4’s dyno is through cats and is full emission legal, isn’t it?
Would love to see what kind of power your project car would put down while remaining emission legal. I think this would be a really fun street car!!
In our state unfortunately, passing an emissions test isnt emissions legal.
Heya guys and gals
Awesome project and write-up! Thanks
There’s one thing here that I don’t get.
I’m fully aware of crank hp and wheel hp, and that different dynos measure different results etc.
However, you wrote on a comment that the car is making around 400 crank hp.
However, isn’t it a lot more?
If the GT4 which has an official 385 hp at the crank measured 302 whp at this dyno.
Then if we assume that the GT4 has the official 385hp and use that to calculate the loss, and apply the same numbers to your Cayman then the actual crank hp would be around 451hp!
Am I missing something here?