Planet 9

I have done the dyno run now.

OK, lets cut to the chase… The improvement is +12WHP (peak point +9WHP). Oh well, I had hoped for better but that’s what it produces on my car which is not stock and has all the simple bolt on mods.

The details are: 06 Cayman S manual, de-snork, Milltek headers & Milltek Cat Back, Evo V-flow filter, Snapflash and now the IPD Plenum.

Of interest is the Torque improvement. On the way back to the office I noticed the change straight away. Butt dyno can definitely detect the change . Have not done any serious driving yet but I can tell that the tires can really easily break loose now. Compared to when I first got the car I could barely get any wheel spin.

The Dynomometer type is a Dyno Dynamics. Operated in shootout mode / Porsche Cup mode. Basically you cant fudge any result in this mode and it is what is used for race car qualification. They also call it the “heartbreaker”. The Tech said "these dynos typically read lower than other model dynos because they are not corrected up", or something like that.

3 runs were done before the mods. Of this the last 2 runs were the same within 1HP.
After the install, the ECU had not adjusted itself yet and interestingly the power went to 294WHP! After that the next 2 runs produced the same power within 1WHP and the curve adjusted very slightly. The operator did not save those curves. I dont expect the ECU will push the power up over time. We could see it adjust initially and then it was pretty well solid after that.

Red is the before and blue is after. A small loss in torque at the very low end as predicted but overall a reasonable result considering a N/A engine.



Shown here is the car on the dyno.



Its been mentioned that the hose length may vary . We had much difficulty trying to make it fit. It looked completely wrong. We cut the hose per the advise, then it was too short!! So the Hose needed modifying again. After close examination the angles are all wrong as well, even if the Plenum was manipulated up or down. So after 3 hours of grunting and groaning we fabricated an adjustable adapter. Man 'o man. Ok I feel better now. Basically we cut the hose in half and inserted a length of steel tube. This allowed the length to be adjusted and the ends of the hose to be rotated plus the main angle could be tilted a bit. In addition, the metal tube insert will prevent the tube from collapsing. We compared it to one of those blue tubes and they are 2 or 3 times as stiff.
See below.



Now to give it some "what for".

Attached Thumbnails

     

First of all, thanks for sharing your results here. Highly appreciated!

Well, +9 rwhp. I agree, not your expected 20.
Sorry to hear about the issue you had with the install. I don’t get it, how can these installations vary so much. Some guys have zero issues and some have trouble…

Since RSS gives a 100% money back guarantee… are you keeping the mod, or are you going back to stock?

Great post 4x4.

I have basically the same mods as you, except B&B headers & exhaust vs. Milltek. I can't imagine that there would be much change due to that.

I am one of the fence sitters. Let me ask about the torque. I think the softest spot in the rev band is under 4k rpms, and the plenum seems to really address that issue.

Do you notice a much improved accelleration through this band, or is more of a "I think there is a difference"?

Also, I still think RSS needs to resolve the hose issue. It is unacceptable that you had to modify your install to that extent IMO.

Take care, and enjoy your mod!

Brian

I didn't expect to see 20+ hp. But any gain is a good gain. To me, it's more interesting what it's done to the torque curve. Just like gforce's dyno run, you are also showing a dip at 5,250. I am very curious if retuning the resonant flap would eliminate this. This is a question for PCA-Tech.

__________________
Gator Bite
PCA Cayman Register Advocate

Thanks, 4by4, for taking the time and $ to do a careful test and post your results!!

9 HP instead of IPD's dyno data showing 20+ HP is a bit disappointing. It will be interesting to see how the other pending dyno results compare with this as they come in. However, 9 HP, and better low end torque, is certainly worthwhile IMHO. At about $110/HP it's fairly cost effective in comparison to some other mods (e.g. Capristo is over $200/HP).

Anaysis ERROR!

Depending on were you compare the curve its +12WHP now!


Gator: thanks for the post fix up.
I predicted up to 10WHP on the monster Plenum thread and was not really expecting a huge improvement although was wishful of a good gain. So that worked out about right...unfortunatley. I guessed a lower figure than the 20WHP advertised based on that that I already have mods and marketing info is usually best case results. Oh well you get that I suppose.

I can really feel the torque improvement. I was not really expecting much change but I think thats its more noticeable than the top power increase. So its better but not like its a huge improvement or anything.

Will I keep it? Well the cost to remove it now and send it back is a bit much. Although the mod costs a bit, compared to the price of the car it all still works out much cheaper than a 997 S. Now it goes better and looks better!

I also examined the throttle body. Based on todays findings IMO, no mod on this will result in more than 2 WHP improvement. The walls are already thin and to machine it to bits will only weaken it.

If anyone cares, Dyno Dymanics really is the best dyno, for whatever its worth. Very accurate, consistent, good reputation.

Greetings Again,

First off, thank you 4by4 for jumping on the dyno and posting your results. We at RSS greatly appreciate all your efforts.

I would like to make 2 very important points.

1. The overall graph is still very consistent with our dyno graph. Power is realized throughout the entire rev range, which is pretty impressive considering most mods deliver gains up high OR down low. So your NET power gains (Not MAX power gains) are really quite nice.

2. We claim that the IPD plenum will provide an additional 24 hp when installed on a STOCK Cayman S. As we all know (or maybe we don't) as you climb the proverbial "Performance Ladder" horsepower is harder to come by and gets more expensive. You will ALWAYS get greater hp yields on your car with your early stage mods than if you install the same mods during the late stage modding process. If you have 4 mods, each claiming/delivering 10 hp you do not get a combined number of 40 hp.

9, or 12 hp gain is pretty damn good considering all the other mods that are installed on the car. Ken will probably see similar gains on his car. Now, all we need are the independent dyno results of the IPD plenum on a stock car.

I hope this sheds some additional light on the subject. Thank again to 4by4 and everyone else for their contributions.

Cheers,
Greg

I would like to see a stock CaymanS run on a dyno and then add the plenum to it. Then run it again back to back without any mods, especially the software. While we see a gain it would be more accurate than perhaps having the software compensating more for the added plenum then it would be without it.
Basically we want to cut any interaction out and test just the plenum.

Agree.... so it seems, assuming other dynos verify similar results, that the smart money will add the plenum first to the stock CS, spending what... maybe $50/hp gain...and then have to really think twice about spending $2-3K for a complete exhaust system that will then offer much lower hp gain....spending ~$200-300/hp gain? Pending further testing, my money's on the plenum...forget the exhaust...stock sounds fine to me.

__________________
Cold Croc
38 years of continuous Porsche ownership

Ride History
1966-1969 ---- 1961 Rambler Classic (Sorry)
1969-1970 ---- 1969 Mustang Mach I (Engine lasted 49K mi... swore I'd never buy another American car)
1970-1972 ---- 1964 356C - Rust Bucket
1972-1976 ---- 1972 914 - Ball Buster
1976-1977 ---- 1973 911T - Was I crazy?
1977-2007 ---- 1963 356SC 306K mi
2001-2003 ---- 1984 911 SC Targa - For my son
2000-2005 ---- 1997 Ferrari 355-F Brain Fart
2007- ???? ---- 2007 Cayman S
2008 ---------- 2008 Audi R8 - Delivery late spring '08

I agree, save the money and put in a LSD or TBD.

Greg, my CS has a little over two thousand miles and it is bone stock, I would consider donating the car for a good cause... ha!

Eventually I would love to install your plennum, but right now my main priority will be coilovers, then an LSD and afterwards the plennum.

Gilles, from OC

Gilles,

I would happily extend an invitation for you to have the plenum installed here at RSS / Stuttgart Performance in Costa Mesa, OC. We will also help subsidize your dyno effort. A 100% money back guarantee on the plenum and no labor to install (or un-install) the plenums. Absolutely nothing to loose and everything to gain. Let me know if you're interested.

Give me a call at 714-545-1046

Cheers,
Greg

Thats what the Tuner said too. As they are made here, almost every tuner or workshop has this model as opposed to an imported dyno. The interesting thing is he said you can dyno at the other guys shop down the road and get almost the exact same result within 2/3 WHP, however best to stick with the same machine if comparing mods over time. Mind you the whole state is at sea level, its never humid here and most days are sunny (good for people, bad for plants).

Anyone make any sense of the Torque curve values?

Well, I am the guy for the stock run post plenum. I installed less than two weeks ago. Pre plenum showed 283 at the rear wheels. I have no mods, not even a de-snork.

I will try to get over to IA next week for post install dyno. I expect gains as I feel more power across the band. As mentioned earlier, I can spin out in 1st and even 2nd. Was not able to do that pre plenum.

283 at the rear wheels would be 317bhp with the 12% loss that the 6spd. 987 has. This is unusually high ????

my guess would be inflated dyno jet numbers.

True, I was just pointing out for the next run and it may be less when the plenum was on and it would not be accurate data.

The plenum should be removed then and a test run or runs done to set a base with the stock plenum to verify. The runs with the plenum could be used though if they were done accurately. The DME will set within 3 runs so there is no requirement to drive it.

Did you see this!
OMG, Gilles, do it! You have nothing to loose and if you add the Softronic Snap-Flash on top of this you might be up for even better gains in the near future.

What are you waiting for

gforce,
If it works out for all the parties involved I will definitelly go for it, but it will depend if RSS and the dyno shop can coordinate their busy schedules to make it work.
Recovering from recent lower back surgery would not allow me to try to do any mechanical work (my wife will kill me for sure..), but I can watch right? (oh, yes!)
Gilles