IPD Plenum - Anyone Installed one?
01-26-2016, 12:35 AM
#31
Three Wheelin'
Hasn't the plenum topic been covered ad nauseum? Or is this IPD one special in some way? 
01-26-2016, 12:45 AM
#32
Race Director
Originally Posted by oalvarez
Hasn't the plenum topic been covered ad nauseum? Or is this IPD one special in some way?
Although there are already other threads started and we could have "saved a thread" here
01-26-2016, 01:29 AM
#33
(newbie) so as not to use the search function as much 
01-26-2016, 09:57 AM
#34
Rennlist Member
great info! note that the X51 plenum is *very* different from the S/IPD one ... if the X51 plenum is responsible for 15bhp of the total 30bhp ... from the throttle
body all the way to the cylinder heads ... I'm a bit skeptical that the IPD can match that gain being a "simple" polished improvement over the plastic S OEM part...
I'm not saying dont do it ... I'm just saying dont look for claimed improvements
body all the way to the cylinder heads ... I'm a bit skeptical that the IPD can match that gain being a "simple" polished improvement over the plastic S OEM part...
I'm not saying dont do it ... I'm just saying dont look for claimed improvements
01-26-2016, 10:34 AM
#35
Rennlist Member
I missed your question, sorry. I bought both of my IPD plenums directly from IPD in Huntington Beach, Ca. Call Greg. I think he will treat you right.
Also to your point of something cosmetic to look at, on the 997 that was the case! It really looked "cool" in there. On the 991 there is no visual 😔!
Also to your point of something cosmetic to look at, on the 997 that was the case! It really looked "cool" in there. On the 991 there is no visual 😔!
01-26-2016, 12:21 PM
#36
There is no way anyone could discern any difference between 15HP/14TQ on 400HP Carrera S, particularly given those gains are usually mostly at the top. It's 100% placebo effect. You're just not going to notice a 4% power increase. Heck, most people say you can't really feel the difference in the Powerkit and that's 30hp.
Not saying it's a stupid spend, as we Porsche owners spend a lot of money on all sorts of stuff others might think is unwise. Heck, I spent $3k just to make my car go poppity-pop. To each his own, I just think there is no real performance gain from these minor mods.
Not saying it's a stupid spend, as we Porsche owners spend a lot of money on all sorts of stuff others might think is unwise. Heck, I spent $3k just to make my car go poppity-pop. To each his own, I just think there is no real performance gain from these minor mods.
01-26-2016, 01:47 PM
#37
Rennlist Member
There is no way anyone could discern any difference between 15HP/14TQ on 400HP Carrera S, particularly given those gains are usually mostly at the top. It's 100% placebo effect. You're just not going to notice a 4% power increase. Heck, most people say you can't really feel the difference in the Powerkit and that's 30hp.
Not saying it's a stupid spend, as we Porsche owners spend a lot of money on all sorts of stuff others might think is unwise. Heck, I spent $3k just to make my car go poppity-pop. To each his own, I just think there is no real performance gain from these minor mods.
Not saying it's a stupid spend, as we Porsche owners spend a lot of money on all sorts of stuff others might think is unwise. Heck, I spent $3k just to make my car go poppity-pop. To each his own, I just think there is no real performance gain from these minor mods.
01-26-2016, 01:59 PM
#38
Three Wheelin'
In the end 15 hp of low hanging fruit wasn't something than too many people believed PAG left on the tree. (And if a Power Kit, at $17K, gives you no torque gain, (not sarcastically) can anyone explain to me how a simple plenum nets added torque.)
But lets say that your $1K to $2K Plenum investment does get you 15 extra hp. Where is that going to show up on the rev curve and in what relation to the torque curve? When you go through the calculations that show speed gains, then work out the math and subtract the increase in drag (square of speed). The real speed gain is going to very, very small. To put things in perspective, a factory power kit gives you something like 35 or so extra hp and no torque gain (997.2) and the speed gain is a 0.1 or 0.2 second zero to 60 time ($17K for a 4 to 5 percent gain).
To me, compared to many other similarly or less expensive sports cars, 911s are not the best in straight line speed. I also get the sense that it is axiomatic that PAG generally builds a 911 sacrificing straight-line hp for speed through the corners. So then, my pea brain gravitates to spending money to accentuate what a 911 already does well, handling, than to try and buy hp that may translate into much less of a benefit.
But in the end, it is your money, spend it on whatever you like.
01-26-2016, 02:01 PM
#39
Rennlist Member
Well, truer words - but isofar as I know on the 997 Board. Back starting in around 2009 or 10 (maybe even earlier) there were long, long threads on this. Dyno results (debated), engineering and even back-and-forths with a manufacturer. I seem to recall the consensus was that for the 997 the Plenum upgrade was useless (unlike what was stated in an earlier post as a quote from a mechanic). The thing was, how would you get meaningful results? Sure, use a dyno, but depending on the calibration and other external factors, these numbers can be dubious.
In the end 15 hp of low hanging fruit wasn't something than too many people believed PAG left on the tree.
But lets say that your $1K to $2K Plenum investment does get you 15 extra hp. Where is that going to show up on the rev curve and in what relation to the torque curve? When you go through the calculations that show speed gains, then work out the math and subtract the increase in drag (square of speed). The real speed gain is going to very, very small. To put things in perspective, a factory power kit gives you something like 35 or so extra hp and no torque gain (997.2) and the speed gain is a 0.1 or 0.2 second zero to 60 time ($17K for a 4 to 5 percent gain).
To me, compared to many other similarly or less expensive sports cars, 911s are not the best in straight line speed. I also get the sense that it is axiomatic that PAG generally builds a 911 sacrificing straight-line hp for speed through the corners. So then, my pea brain gravitates to spending money to accentuate what a 911 already does well, handling, than to try and buy hp that may translate into much less of a benefit.
But in the end, it is your money, spend it on whatever you like.
In the end 15 hp of low hanging fruit wasn't something than too many people believed PAG left on the tree.
But lets say that your $1K to $2K Plenum investment does get you 15 extra hp. Where is that going to show up on the rev curve and in what relation to the torque curve? When you go through the calculations that show speed gains, then work out the math and subtract the increase in drag (square of speed). The real speed gain is going to very, very small. To put things in perspective, a factory power kit gives you something like 35 or so extra hp and no torque gain (997.2) and the speed gain is a 0.1 or 0.2 second zero to 60 time ($17K for a 4 to 5 percent gain).
To me, compared to many other similarly or less expensive sports cars, 911s are not the best in straight line speed. I also get the sense that it is axiomatic that PAG generally builds a 911 sacrificing straight-line hp for speed through the corners. So then, my pea brain gravitates to spending money to accentuate what a 911 already does well, handling, than to try and buy hp that may translate into much less of a benefit.
But in the end, it is your money, spend it on whatever you like.
01-26-2016, 02:05 PM
#40
But that's my point, a random roll on test with another car is totally unscientific and part of the placebo effect. Even if you achieved a full 15hp difference at the wheels, that will not have one car accelerating away from the other. A 4% difference in HP on these cars will result in an almost imperceptible difference in speed/acceleration on the road.
05-30-2016, 05:43 PM
#41
Advanced
Plenum
Went to my local Porsche dealer today to ask about what would they charge for installing an IPD plenum and was told that it will bring on an engine check light. Is that true?
05-30-2016, 05:44 PM
#42
Rennlist Member
05-30-2016, 05:52 PM
#43
Advanced
It very frustrating to have a dealer not know the facts about what you are asking them to install and then hand them the keys to work on your vehicle and charge you over $125 an hour. Thank God for this forum.
05-30-2016, 06:01 PM
#44
Rennlist Member
they may not have seen an IPD plenum before, or be comfortable in installing aftermarket parts (warranty) ...
05-30-2016, 06:23 PM
#45
Rennlist Member
"downwind" of all the engines intake sensors, so I dont really see how it
would result in a MIL ...