DIY Mod: IPD Plenum
#31
#32
Update: John form Fabspeed called me today and we had a good chat. My issue happened 3 years ago but he invested the time to listen and did the right thing.
Last edited by user 72902; 04-15-2016 at 06:58 PM. Reason: Update
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panchosouth (08-31-2019)
#33
OK, thanks. I just recently upgraded to the 82mm IPD plenum and larger throttle body. The car has X51 headers, high flow cats and tuned by VRTuned but still on the standard 3.8L airbox. The plenum and throttle body where the last pieces.
My car runs smoother now above 4K rpms and pulls a tiny bit stronger at 5K+ rpms. But the engine growl is slightly lower below 4K. That and I had problems fitting the stiff 82mm hose between the airbox and larger throttle body - it's too long and the recesses at the attachment points make it difficult to shorten. I ended up trading that hose out for an OEM X51 airbox hose and fabricated an extension piece for it to fit properly to the standard airbox.
I'm probably going to stick with the larger TB/plenum but will admit I've thought of downgrading to the standard one.
My car runs smoother now above 4K rpms and pulls a tiny bit stronger at 5K+ rpms. But the engine growl is slightly lower below 4K. That and I had problems fitting the stiff 82mm hose between the airbox and larger throttle body - it's too long and the recesses at the attachment points make it difficult to shorten. I ended up trading that hose out for an OEM X51 airbox hose and fabricated an extension piece for it to fit properly to the standard airbox.
I'm probably going to stick with the larger TB/plenum but will admit I've thought of downgrading to the standard one.
#35
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I had the 82mm IPD plenum but I had so many problems with fabspeed and their tuner after installing their cold air intake that I reverted back to the stock throttle body. I don't want to hijack the thread but episode cost me about $5,000. But I'll say IPD is awesome to work with and have great customer service.
__________________
Porsche Performance Specialist
John@Fabspeed.com
215-618-9796
Fabspeed Motorsport USA
155 Commerce Drive Fort Washington, PA 19034
www.Fabspeed.com
Porsche Performance Specialist
John@Fabspeed.com
215-618-9796
Fabspeed Motorsport USA
155 Commerce Drive Fort Washington, PA 19034
www.Fabspeed.com
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dkfx (07-31-2020)
#36
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I changed back to the 74mm IPD plenum. I also have headers, sport cat, and non-stock mufflers. The difference between the before and after dyno was like 33hp and 34ftlbs torque. There are a few more factors to muddy the waters 1) different dynos and 2) a professional custom tune but those numbers should be representative of expected returns from the above mods. To what extent the plenum played - who knows.
BTW, I have IPD Plenums in both my wife's stock 997.1 C2S and just put an 82mm one into my '09 Cayenne Turbo S last night (haven't even driven it yet). On the 997 though, throttle response was improved, mid-range and top-end pull were both improved. No dyno #s, but definitely a difference.
Someone stated the only way to make more power is to get more air (and corresponding correct amount of fuel) in and out of the engine and how could just an intake plenum do that? With the IPD design, I believe the air going through the plenum is much straighter and probably has a higher velocity compared to the stock T-shaped plenum and that air in the stock plenum is probably much more turbulent inside. If the air is "bouncing around" in the plenum, that could certainly limit the amount of air entering the engine, thus limiting the power available. I don't have any evidence or test data to back this up, just offering it as a plausible explanation for the results that those of us with the IPD plenum are feeling.
Also, it's really a nice unit and although mostly hidden on the 997, it's front and center in the engine bay on the Cayenne TTS.
#37
I realized again today there's the headers and cats from Fabspeed plus 82mm Intake Plenum but po sold cans and replaced with Borla. I have all the flexible tubing from Fabspeed as well.
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panchosouth (08-31-2019)
#40
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Thank you very much for the kind words. This is more than a business, this is a community. It is the least I can do, and on 4/30 i'll be joining as a Porsche owner myself at long last haha
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panchosouth (08-31-2019)
#41
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I've had nothing but positive experiences with Fabspeed, the most recent being last week with Alex. Bought a set of secondary cat bypass pipes for my 957 Cayenne and needed the instructions. Sent Alex an email and within 15 minutes had a response with the instructions attached. Installed them yesterday. Fabspeed's quality is fantastic - thickness of the material, quality of the welds, mandrel bends, fitment, etc. This is my second Porsche with a Fabspeed exhaust product on it - wish they made them for my '79 928 and my 914.
#42
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I've had nothing but positive experiences with Fabspeed, the most recent being last week with Alex. Bought a set of secondary cat bypass pipes for my 957 Cayenne and needed the instructions. Sent Alex an email and within 15 minutes had a response with the instructions attached. Installed them yesterday. Fabspeed's quality is fantastic - thickness of the material, quality of the welds, mandrel bends, fitment, etc. This is my second Porsche with a Fabspeed exhaust product on it - wish they made them for my '79 928 and my 914.
#43
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Thanks - nice offer, just not very realistic since we're probably 12-14 hours apart. What I need to do is have other Rennlist buddies with the same year and model cars decide to go in with me, have them drop off their cars, and you make 2 of everything
#44
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lol I like your style! Get a thread going lets make it happen