mobonic

That's the beauty of being single, if the gf doesn't like how loud it is..... you just get a new one (gf not mufflers)

KeninBlaine

For the record, your review is SUBJECTIVE. An OBJECTIVE review would be based on actual measurements of some sort that could be analyzed.

Since dynos seem difficult to use for measuring the small power differences (if any) from various mods such as the plenum, I'd like to see blind tests done on similarly equipped cars, one with IPD plenum and one without. Then let a driver drive each car back to back, and see if he can identify which car has been modified. It wouldn't be easy, but it would be revealing.

mobonic

You are right... I meant subjective. Thanks for the English lesson

997GiTi

Can a 3.6 plenum fits a 3.8 engine?

kdurg

^^^ Yes.

JackQ

I am skeptical that any power will be added by a Plenum change, Porsche would have already built it that way. Even Headers and CATS make a small increase in 15- 20 maybe, no one’s butt is accurate enough to really feel the difference. I tested my car with a Gtech before and after Awe CATS and no measurable change was detected. All of the “magic” change to get easy HP that have been independently tested have shown no increase in HP and sometimes less.

alexb76

You just contradicted yourself, no one is saying Dyno is gonna give you an accurate HP number, but from options available to compare before/after effects of a mod, is THE BEST tool.

You could have easily done a base HP, records all number (temp, humidity, engine oil/water temps), install the mod, ensure ECU adopts to it after driving it for a while... then do another dyno on the same machine, trying to mimic the same environmental conditions (temp, humidity, engine oil temp, etc...).

All else is just all subjective assessment of mod efficacy!

This is THE ONLY way small shops and tuners can tune their cars without expensive labs, and resources only available to car manufacturers!

mobonic

Alex,

It was a contradiction, I agree.

But if you know the background to the plenum debates, there have been 5-10 individual dyno's (before and after) with plenums and exhaust (shops and individuals) and every time a huge debate arises. (Im sure a search will bring up 10+ threads just on this 1 forum).

We did a before an after at the track with laps times, but did not publish because again, too many variables (Tire degradation, track temp, track conditions.....) so what was meant to be an OBJECTIVE review became SUBJECTIVE after we decided that too many variables could come into play, just like the dyno debate.

So I decided to just give my thoughts on the plenum to other members and they can use my subjective info to make a decision.

I believe in the dynamics and science behind the plenum, and thats why i bought it, no other reason.

When "I" buy a mod for my car I ask myself and my mechanics one question.

"Will it make my car better or more reliable for track use". If the answer is yes or maybe and I believe the science behind it. Then I'm willing to give it a shot.

mobonic

for what its worth, a year later i still have the IPD plenum on my car.

alexb76

Fair enough, but your observations are lot more subjective than a proper dyno run before and after. Neither completely objective but the goal is to take as many variables as you can out of the equation...

Well, I'd say 90% of them answer "Yes"! as his answer to your question is the MOST SUBJECTIVE answer you can get!

Bjarke Hjort

Hi :-)
What throttle body do you have on your car? 82mm or 74mm

Kind regards
Bjarke Hjort

love2drive

I appreciate this review but it only reinforces that status quo on IPD Plenum; it' just not worth the grand. Period.

$200, maybe

Appraiser

Sweet tap dancing resurrection of a thread...

For whatever it's worth - I swapped the IPD plenum on my otherwise stock M96 motor and found my acceleration times increased marginally. I did a write up with numbers on it using GPS and a lap timer for acceleration sprints. Others have dyno'd it before/after and lost horsepower. But then again it seems nearly every day race team with a 911 has run or runs it to their success.

For used money it's a fun mod and blings the engine bay a little more. Brand new it's too expensive for my coffers. I am curious to see what/how it may change with a tune... whenever Softronic goes on sale!

gasongasoff

Interesting. First I've heard of this. Do you have a link to a dyno where the plenum sucked away HP?

Appraiser

https://www.6speedonline.com/forums/...ss-plenum.html

You can skip ahead to post #71