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Dyno'd my Cayman S before and after an IPD plenum install.

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38K views 24 replies 11 participants last post by  lkl777  
G
#1 ·
RSS had a dyno day and I brought my stock 2006 CS. First they ran a stock run on the dyno and my figures came out better than I ever could have expected.

According to GT pro, the tuning company that owned the dyno, that figure is about 10hp more than they have ever seen on a stock Cayman S of which they have dyno'd quite a few.

Then they installed the IPD plenum and ran the engine for a while before doing another trio of pulls on the dyno. I didn't get a huge amount of extra horsepower, only about 10hp or so, but I did get about 20lb's of torque extra right about 4800rpm. Funny thing was that the car lost a few lb's at very low rpm but the gains elsewhere more than made up for this.

Then they pulled the plenum and installed a GT3 throttle body and a new competition plenum. After another while letting the engine run they pulled another trio of dyno's and there wasn't a huge improvement, another couple of HP and a few lb's of torque. They said that you really need a easier breathing exhaust to see any real improvement from this mod, which I probably won't ever install so I decided to just go with the standard IPD plenum. They pulled the GT3 throttle body and IPD competition plenum and reinstalled the normal IPD one.

There was a good atmosphere and everything was above board. There were a few shocked 997 owners there when the first pull on the stock car came in at about 275whp and 237lb's of torque. Figuring a 15% driveline loss that equates to 315whp and 272lb's. The noise was incredible!

Greg from RSS is going to email me the dyno charts and I will post them as soon as I get them. If I left anything out feel free to ask and I will be happy to answer anything that I can.

G.

P.S When you see the stock Porsche plenum you would almost want to swap it out even if you didn't get any gains, its such a nasty tatty bit of plastic:) Still I guess that Porsche knows what there doing and its also fair to say that so do RSS and IPD.
 
G
#9 ·
I ran a 2:13.3 on config 13 at Buttonwillow, which is down from my best of 2:17.5 pre quaif dif(or P.Q.D as it will be known from now on:)).

How much was the IPD plenum, how much was the lSD and how much was the Pagids(I only ran the fronts with poterfields on the rears)? Hard to say but the one thing I noticed more than anything is how much easier the car is to drive with the slippy diff. Kick *** stuff indeed. Thanks to everyone for all of this.

G.
 
G
#6 ·
These are the last of the shots I took. Ask Greg at RSS to send you a picture, he's a good guy(as is his dad) and I'm sure will be helpful to you.

Great pieces though, nice coating on the inside, really nicely engineered.

G.
 
#10 ·
Am I correct to say that there are two configurations here?
1. IPD plenum + stock throttle body
2. New plenum + GT3 throttle body.
The first one is the one that dynoed +10-12 whp higher. The second one is inconclusive.
And none of the above was with any ECU flash. And without new software, how on earth is the engine going to adapt to the geometry of the new hardware?
 
G
#11 ·
No ECU reflash or software of any kind. The torque was a much more substantial gain compared to HP but Greg at RSS assured me that he will post the dyno's for all.

As to how, I don't know. I took a while for the car to adapt, but adapt it did.

It must be a trick:)

G.
 
G
#12 ·
The GT3 throttle body and competition plenum made a few more HP and a few more lbs of torque but without a freer flowing exhaust it really wasn't going to be at its best. I have no intention of swapping my exhaust out so I asked them to remove it and put in their standard plenum.

I was under no obligation to purchase anything but with the substantial torque gains above 4800rpm I felt that it was a worthwhile modification. I have no affiliation to RSS or IPD but there is something to the product that they sell.

G.
 
#15 ·
I admire your attitude, but a Cayman S has no chance whatsoever against a well-driven GT3. Just ask "bob", who raced a nicely set up Cayman S, what his chances are of ever catching "mooty", who drives a GT3. I watched them race at Thunderhill, and the GT3 was several seconds faster every single lap.
 
G
#18 ·
I just got the dyno charts from RSS and I have to say I kind of missed a few key points at the dyno day when I was being shown the readouts on the computer. I thought that when the crew referred to Max HP gain and Max Torque gain that these occurred at Maximum Hp and Maximum torque, but you live and you learn. I am more than happy about where the HP and torque gains are as this is where I need them at the track. Maybe if I were to have the same choice again I might have gone for the competition plenum and the GT3 throttle body as the HP curve on this doesn't dip slightly in the same manner as the IPD plenum between 6000-6500 rpm but whether or not you could really feel it I don't know. Plus when talking to the anoraks(A joke for some of our English friends) its always nice to say that you actually swapped in the wider GT3 throttle body and competition plenum onto the flux capacitator:)

G.

P.S I had a scary moment while driving to the track and noticing how low my gas milage was but on the way back I got my friend to reset his mpg on his 997 911 x-51 and came to the conclusion that I was just being nutty. I got 25mpg traveling at an average of 80mph and he got 22mpg.
 
G
#20 · (Edited)
If you look at the video that RSS posted from the event and notice the base HP and torque from the different cars its quite interesting............

987 Cayman S 276hp 238lb

997 Carrera 289hp 256lb

997 Carrera S 305hp 254lb

996 Carrera 296hp 256lb

The 997 Carrera S is supposed to have 355hp at the crank yet taking into consideration a 15% loss its only making 351hp. The 997 Carrera is supposed to have 320hp and this example has about 332hp. The 996 Carrera is a strong example with about 340hp at the crank. I'm not sure but I think they were rated at 320hp as well. The torque is better is all the bigger displacement engines when compared to the Cayman S. The Cayman S is supposed to be rated at 295hp but mine makes(made) about 317hp. It all goes to show that you never know what your going to get. You could buy a bad 997s and against a good 997 you just got kinda screwed. Just a thought.

G.
 
J
#21 · (Edited)
From the hp scale on the left, the race plenum (green) seems to have provided an average of 7.8 hp gain from 5k rpm to 7k rpm, while the other plenum (red) provided an average of 5.5 hp gain over the same rpm span.

Method: I used my clear plastic scale to estimate hp differences at 5.0k, 5.5k, 6.0k, 6.5k, and 7.0k rpm. Admittedly a pretty rough estimate. The red plenum just doesn't add anything at the 5k and at 7k measuring points, while the green plenum does. I would have tried to do the torque gains the same way, but the vertical scale is just too small.

Thanks for posting the dyno results.
 
#25 · (Edited)
I just posted on my install without the larger throttle body and very noticeable differance. And that is being mild Greg is a cool cat. Even though I did not buy from him he is working with me. I'd lay my 383 stroker on the table if it did not do what I said it did. Hope you have better gains than I with the larger system. I know I had to get a solid 5 hp at the wheels maybe a tad more check the thread out. And the next time you talk to Greg tell him Col Lambert said hey. Sent him some pic's of my old RUF and a few other beasts
 
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