Plenum owners, feedback please
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This seems to confirm consistent gains
Referencing the RSS dyno, they seems to confirm consistent gains between 3.6l and 3.8l motors. I doubt the exhaust is much of a factor.
Thanks for posting and working to clear-up any doubt.
Thanks for posting and working to clear-up any doubt.
Last edited by Gundo; Mar 6, 2008 at 06:08 PM. Reason: post update
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Greetings Again 6 Speeders,
Here are some dyno charts of the plenums (before and after the plenum install). Instead of sounding like a broken record and beating a dead horse I will just say, if anyone is not completely satisfied with gains provided by the IPD plenum you can return it for a full refund. If you're in the Southern California area we will even back up the plenum satisfaction with free install and removal at our facility, Stuttgart Performance.
We sell the plenum to Porsche dealerships and even a good number of plenums back to the motherland in Deutchland. The IPD plenum is the absolute single best performance mod you can possibly install on any late model Porsche, Period!
Thanks to everyone for all the continued support and promotion of the IPD plenums.
I know this is the 997 section but the 3.6 liter motors are essentially the same.
Here are some dyno charts of the plenums (before and after the plenum install). Instead of sounding like a broken record and beating a dead horse I will just say, if anyone is not completely satisfied with gains provided by the IPD plenum you can return it for a full refund. If you're in the Southern California area we will even back up the plenum satisfaction with free install and removal at our facility, Stuttgart Performance.
We sell the plenum to Porsche dealerships and even a good number of plenums back to the motherland in Deutchland. The IPD plenum is the absolute single best performance mod you can possibly install on any late model Porsche, Period!
Thanks to everyone for all the continued support and promotion of the IPD plenums.
I know this is the 997 section but the 3.6 liter motors are essentially the same.
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Well there is always a plus and neg to any modification, i guess it all depends on the individual whos spending the $. I just test drove my friends 997s so i never spent the $ but i didnt think that "increase in power was worth it to me" ill save my money and just be thankful i am driving the car i am.
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Wrong. It is not part of the game. We are not in the business of manufacturing and testing after market car parts. We are in the business of going to work (some of us) and making money. Therefore, when someone sells you something and makes a claim, they have to have verifiable, tangible support.
Is it just me or is this the most basic, fundamental principle? How easy would it be for all the people who argue that it "feels" faster to prove it with empirical evidence. Better yet, why not the manufacturer.
Furthermore, I'd like to point out that all companies who claim certain performance increases WITHOUT contemplating other factors, i.e., mods like exhaust, are purely skewing the results. Life is not a vacuum nor should this be. There has to be one guy out there who has evidence of each one of the dozen mods and what each one adds. I doubt if you did every single mod out there, with the exception of a super charger, you're lucky to get 400hp on a non-aspirated Carrera S. Law of diminishing returns, but of course no manufacturer states that.
Shocker.
Is it just me or is this the most basic, fundamental principle? How easy would it be for all the people who argue that it "feels" faster to prove it with empirical evidence. Better yet, why not the manufacturer.
Furthermore, I'd like to point out that all companies who claim certain performance increases WITHOUT contemplating other factors, i.e., mods like exhaust, are purely skewing the results. Life is not a vacuum nor should this be. There has to be one guy out there who has evidence of each one of the dozen mods and what each one adds. I doubt if you did every single mod out there, with the exception of a super charger, you're lucky to get 400hp on a non-aspirated Carrera S. Law of diminishing returns, but of course no manufacturer states that.
Shocker.
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I totally undertand how this mod could improve performance and if it was a few hundred dollars I would check it out and install it. However a $1000 just does not seem worth it to me at this point.
I did a simular mod to a '87 and '92 Vette. The claim was 11-14hp and the cost was something around or under $100. Ecklers and Mid-America catalogs sold this plenum air foil. I could not feel a difference with this mod but I knew it would take around 25hp to feel a difference anyway but again it was under $100 for the cast piece of metal.
I did a simular mod to a '87 and '92 Vette. The claim was 11-14hp and the cost was something around or under $100. Ecklers and Mid-America catalogs sold this plenum air foil. I could not feel a difference with this mod but I knew it would take around 25hp to feel a difference anyway but again it was under $100 for the cast piece of metal.
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I totally undertand how this mod could improve performance and if it was a few hundred dollars I would check it out and install it. However a $1000 just does not seem worth it to me at this point.
I did a simular mod to a '87 and '92 Vette. The claim was 11-14hp and the cost was something around or under $100. Ecklers and Mid-America catalogs sold this plenum air foil. I could not feel a difference with this mod but I knew it would take around 25hp to feel a difference anyway but again it was under $100 for the cast piece of metal.
I did a simular mod to a '87 and '92 Vette. The claim was 11-14hp and the cost was something around or under $100. Ecklers and Mid-America catalogs sold this plenum air foil. I could not feel a difference with this mod but I knew it would take around 25hp to feel a difference anyway but again it was under $100 for the cast piece of metal.
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Thanks RSS for your repost. You are preaching to the deaf. Most of the guys left on this thread already know all the answers. Maybe one of the others will do a dyno. If so I hope they do it for themselves, not because of the pressures here. I would have to remove the headers at this point and start over. Then some would claim foul because of the day of the week the run is made. I do understand where the objectivists are coming from. Btw, roll on will not work unless you have done a pre install "test". That would be cool. I may come back to this because I am not real happy w the way the headers added after the plenum seem to have jerked the power curve around. If so, I will do it differently. I truly am confident with the plenum mod. Cheers Gerry
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I'm selling mine. See it in the FS section.
https://www.6speedonline.com/forums/...d.php?t=121301
https://www.6speedonline.com/forums/...d.php?t=121301
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I didn't spend 150k on my car so not everyone bought their Porsche with money gushing out of their wallets. I got a good deal on my car so i bought it. About the plenum deal I'm satisfy with the way it drives so i won't be dynoing. It's all a matter of if you're satisfy with what you spend who cares what others think.
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Thanks RSS for your repost. You are preaching to the deaf. Most of the guys left on this thread already know all the answers. Maybe one of the others will do a dyno. If so I hope they do it for themselves, not because of the pressures here. I would have to remove the headers at this point and start over. Then some would claim foul because of the day of the week the run is made. I do understand where the objectivists are coming from. Btw, roll on will not work unless you have done a pre install "test". That would be cool. I may come back to this because I am not real happy w the way the headers added after the plenum seem to have jerked the power curve around. If so, I will do it differently. I truly am confident with the plenum mod. Cheers Gerry
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The car felt stronger with plenum right from off idle to redline. No problem. I then added ebay headers as a cheap experiment. The power curve seemed to shift up with a loss on the bottom end and I can't tell whether there is a true gain on top or not. For that I would have to dyno the car. This is not a problem with the plenum. I am not so sure whether the ebay headers are an improvement or not. I have been told I need to flash now to regain all of the bottom end but I am reluctant to risk it. Let me be clear: the plenum is an improvement throughout the power band. It does not "feel stronger on top because it lost bottom end". That may be true for the headers though. Sorry if I confused the issues. Note this is using stock, non PSE, cans if that matters. Gerry
Last edited by Gpjli; Mar 7, 2008 at 09:00 PM.
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The car felt stronger with plenum right from off idle to redline. No problem. I then added ebay headers as a cheap experiment. The power curve seemed to shift up with a loss on the bottom end and I can't tell whether there is a true gain on top or not. For that I would have to dyno the car. This is not a problem with the plenum. I am not so sure whether the ebay headers are an improvement or not. I have been told I need to flash now to regain all of the bottom end but I am reluctant to risk it. Let me be clear: the plenum is an improvement throughout the power band. It does not "feel stronger on top because it lost bottom end". That may be true for the headers though. Sorry if I confused the issues. Note this is using stock, non PSE, cans if that matters. Gerry
The AWE cats do add noticeable extra 'go' right through the rev range however, with no apparent losses anywhere. Reverting to the stock cats makes the car feel noticeably slower (in direct contrast to the headers). The AWEs are now a permanent fixture!
I'm going to try a pair of X-51 headers next and a plenum. Be interesting to see what results I get.
Ian
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What I wish would happen is that some of these Porsche magazine get it together and test some of these parts. Wouldn't be nice if Excellence put together a 3 part article on 997S engine mods and provide dyno and track results for each mod? This way we could see what headers do to the power curve and see how the plenum affect power and what mods work together as a package and what mods do not work together. Vette magazines do this all the time!
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+1 regarding headers. I had a pair of Fabspeed headers on my 997S (together with AWE cats and the stock mufflers) and it never felt quite right. Reverting to the stock headers was a revelation! The loss of top end is barely noticeable compared to the Fabs but the increase in low- and mid-range torque was startling. Didn't realise just how much had been taken away. The car is a much nicer drive on the stock parts.
The AWE cats do add noticeable extra 'go' right through the rev range however, with no apparent losses anywhere. Reverting to the stock cats makes the car feel noticeably slower (in direct contrast to the headers). The AWEs are now a permanent fixture!
I'm going to try a pair of X-51 headers next and a plenum. Be interesting to see what results I get.
Ian
The AWE cats do add noticeable extra 'go' right through the rev range however, with no apparent losses anywhere. Reverting to the stock cats makes the car feel noticeably slower (in direct contrast to the headers). The AWEs are now a permanent fixture!
I'm going to try a pair of X-51 headers next and a plenum. Be interesting to see what results I get.
Ian