So they did both runs on a same day, just prior and post install?
It`s interesting. I just looked at stock plenum again, still not sure how it can be possible. But if it happens - well, good, then.

 

Sale on the plenum right now if anybody is insterested.

 

They will post the dyno soon and to your question is YES.

 

I do not know who you are and what kind of Rep you have in public but I can tell it's not much.....it's not worth while for me to say anything to someone that is brain dead

 

I did a lot of research on the Plenum and here is what I found for NA cars:

1) By itself it doesn't do much, with other mods it can make a difference
2) Most of its gains come sub 4000rpm
3) If you're going to do it, the best mod to do with it is a GT3 throttle body (bigger)
4) The "we dyno'd baseline then threw it in and dyno'd again for a huge gain" is useless. These cars have sophisticated engine management systems that need time to re-learn any changes to the car. The reason you see gains right away is because it hasn't adjusted to the new parts and still thinks the old one is in there. Once it learns the part it will adjust accordingly. You should put 50+ miles on the car before re-dyno for a more accurate reading.

 

Your actions don't match your words. But if your imaginary gains make you feel good, I am happy for you.

 

Thanks for all the comments. The IPD Plenum product line RSS represents and distributes offers a proven performance gain and improved driving experience. Other companies would not have tried to copy the IPD design and we would not have sold thousands to happy customers if this were not the case. As always, we offer a 100% money back satisfaction guarantee. In addition to the many dynos shared over the years and the many satisfied customers, here is a recent dyno on a 996 X51 with the addition of the IPD plenum:

 

The gains aren't imaginary, I was also at the bbi dynoday and stood in front of the dyno screen and saw the HP numbers being put down real-time by the '04 X51. I don't think anyone is trying to make themselves feel good but instead stating the facts of what happenned nothing more.

 

It would be interesting to see what effect it makes, if any on regular stock 997 and 997s when plenum is the only part getting replaced. 996 with x51 upgrade is not exactly standard base point.

 

This is a very interesting thread. Though I too have been dubious of the value of the plenum change, this is the first time I recall seeing a direct before/after dyno test. Yes, this x51 example does not represent my stock 997S engine, but it is reasonable science. And though, as noted, the ECU does take time to readjust parameters after driving/engine changes, it's hard to imagine that it will struggle to take power out of the system. To be fair, I don't have a clue regarding the ECU algorithms, but it would seem that if that was a key property, it would negate headers, cats, mufflers, airboxes, and other changes.
I can't say I'm completely convinced of the value and universal applicability of this mod, but a small step has been taken.

 

Time to check reality & see the graph.....on the other hand it would be useless b/c there is no cells in that brain to see the obvious. I think you just ruined your Rep. on this forum guy. Very very smart. Next time use a little brain and thought before you open your mouth

 

The engine managment system has set parameters that it deems acceptable range for the operation of the car. Anytime you mod a car, you should disconnect the battery, then re-learn the new parts. A simple plenum change and all else being the same will not make quite the gains seen here on these instant dyno runs. When you add other mods to it, like headers, cats, airboxes, throttle body's, the system is sophisticated to re-learn them and operate the car within its acceptable range of operation. You will get gains from these mods. But, to get the most gains out of them you have to re-tune the software and change the parameters of the system to maximize their effeciency.

I too would love to see a bone stock 997S baseline dyno, then the plenum installed and properly learned and re-dyno'd.

 

This thread did not need to go down this road, however I totally understand the nay-sayers, I was also very critical, but the truth is – it works. Nice as a stand alone modification and a great upgrade for those doing multiple performance modifications... This is a simple bolt-on upgrade that improves the driving experience from the stock setup...

Here is an INDEPENDENT TEST of Stock 997S vs. 997S w/ IPD Plenum (Pic#1 is Full Dyno, Pic#2 is closeup of HP graph, Pic#3 is closeup of TQ graph) with partial adaptation, even larger gains were seen after full adaptation...

 

Bryan - I am not a 'nay-sayer', but I'd prefer an unbiased approach to the products results. These graphs look good but do they tell the whole story?

Was the ECU reset before each run in these tests or just before the Plenum was installed?

You show the high and low runs of stock, but what about the high and low runs with the Plenum?

I noticed the run condition temps are different between stock and plenum, doesn't this invalidate the test?

You state 'even larger gains were seen after full adaptation...' but you don't show them? Wouldn't you want to show the products true potential if this statement were true?

Not trying to pick a fight, just looking for the truth...

 

No worries ntlgnt1 - I know you're not looking to pick a fight plus I'm sure we all have better things to do, again I was very critical of the Plenum during R&D back in the day as well so I totally understand your questions and members' critiques. If the thing didn't work, I'd be the first person on the soapbox. I will relay your specific questions about the dynos to the owner and inventor of IPD, Turbo Mike. The thing with Dynos as you probably know is that they don't tell the whole story even in the most controlled environment anyway. We show the dyno with the partial adaptation to give a baseline, moderate expectation. This particular car left the dyno, came in later and had better gains as the ecu learned. There has been a number of people doing time runs instead of the dyno before and after the plenum install which also shows good gains in performance. These trials can also be debunked for those who wish to by finding some reason to debate. At the risk of being eaten alive by you guys, the basic thing with the plenum is, it does offer proven gains and improved driving experience for those who wish to try it. Improved throttle response, improved HP and TQ, for those who don't wish to try it, it's quite simple - don't try it. For those who wish to add a little more zip, the 100% money back guarantee speaks for itself. Thanks...