IPD Plenum - best performance mod?

[ike84]

Michael,

Very nice writeup about the tuning. I can't stand when people talk about all the power you get out of custom tunes, and how tunes are written for specific "parts" like catless headers. There may be some room for advancing spark in this motor but as soon as you knock the dme will pull the timing. You can alter the AFR target in closed loop operations, as it looks like yours has been, but your gonna pay for it one way or the other (either with more heat or more fuel).

A huge barrier to tuning is the ME 7.2. Even on the nefmoto site, which is probably the internet's best group of euro tuning junkies, the consensus is to not try to mess with it. Too complicated, no aftermarket support, no technical education. All guess work, and lots of risk. FVD claims that their tuners are trained in ME 7.2 but amazingly enough I could never get one of these guys on the phone.

Im surprised that you managed to get any bump out of a tune with fabspeed. I spoke with them directly about developing a tune last fall and let's just say I was fairly convinced they didn't know they first thing about tuning.

There is another thread where Pedro's plenum was dyno test and showed nearly identical number to yours. The theory with both of these plenums is that the Y shape helps to improve laminar flow around the split, but clearly this is not the case.

There is always the interesting war between CAI and short ram fans. One thing that I think is true that some engines do better with one over the other, and I think that the M96 may like short rams.

The reason I say this is because of my fuel trim data on my base 986. I run a 996 tune with a 996 plenum, 82mm TB, and short ram 3.5" dual filter intake that runs straight into my trunk. It's about as short and fat as you can make it.

My long term fuel trims are -17% on both banks. What's interesting here is that a 2.7L is 20.6% smaller than the 3.4. But my setup (which in closed loop runs at 14.7+-.2 at all times, I have a WB sensor installed) is managing to pull more air. By my calculations, I'm getting 4%ish more air than what I should proportional to displacement. And that's actually with my intake temps running hot because of the heat in the trunk, about 100F. I have no idea if this has translated into more power but I found it interesting.


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[michaelpetersen3]

Hi Paul, I really like the idea of the direct connect dyno. It takes one more variable (wheel rolling resistance) out of the equation. Should give you more consistent results. Im pulling 79HP/L on my 3.2. You should be able to pull 285HP from your 3.6 w/ exhaust work, maybe 290/295HP if you eliminate rolling resistance. BTW, if you want to see the details on my exhaust mods and dyno results, I posted a vid several years ago here: https://youtu.be/MdCQg2tJFYg.

Hi Ike, Sounds like you have more depth on the Porsche tune than I. We ran the car back to back with the stock tune vs Fabspeed. It was an honest 4-5 HP. Not huge, but honest. Looked like the achieved it through a leaner A/F ratio. That said, when I spoke to Fabspeed they clearly outsourced their tune, but I do not know to whom. Fabspeed acted as the intermediary. It took them 2 tries to find the few HP, but they did. As I mentioned, they are no longer offering tunes as the EPA shut them down. Disappointing, as the number of tuned cars is 0.001% of the overall car population, and most of these cars see little street time. They are chasing mice nuts IMO. Government agencies finding more reach than value (I'll stop my political rant now, sorry).

[ike84]

Originally Posted by michaelpetersen3

Hi Paul, I really like the idea of the direct connect dyno. It takes one more variable (wheel rolling resistance) out of the equation. Should give you more consistent results. Im pulling 79HP/L on my 3.2. You should be able to pull 285HP from your 3.6 w/ exhaust work, maybe 290/295HP if you eliminate rolling resistance. BTW, if you want to see the details on my exhaust mods and dyno results, I posted a vid several years ago here: https://youtu.be/MdCQg2tJFYg.

Hi Ike, Sounds like you have more depth on the Porsche tune than I. We ran the car back to back with the stock tune vs Fabspeed. It was an honest 4-5 HP. Not huge, but honest. Looked like the achieved it through a leaner A/F ratio. That said, when I spoke to Fabspeed they clearly outsourced their tune, but I do not know to whom. Fabspeed acted as the intermediary. It took them 2 tries to find the few HP, but they did. As I mentioned, they are no longer offering tunes as the EPA shut them down. Disappointing, as the number of tuned cars is 0.001% of the overall car population, and most of these cars see little street time. They are chasing mice nuts IMO. Government agencies finding more reach than value (I'll stop my political rant now, sorry).

I'm 100% on board with your rant. ****************, you cant even buy a new tractor without a def system on it. I recently stripped all my emissions gear on my Duramax 3500 - not because I ever roll coal, but because the rules are so stringent that when a part breaks it puts the truck into limp mode with permanent dtcs that can't be cleared without a gm reader.

Our forum has a lot of super knowledge guys and gals with tons of experience, but the thing we don't have among us are engine builders. They just don't really thrive in the Porsche world. I'm certainly not one, but I can tell you this - there are only two ways to make REAL power gains on a NA motor - built engine with lighter/stronger components and more aggressive cams OR conversion to forced induction. Unfortunately there aren't great kits for either of these available for the M96 motors. The x51 option was a "built" version of these motors but was never offered as an aftermarket kit so that's out the window. TPC made the SC and now the TC kits for these cars but I wouldn't trust them. So, people are left with intake/exhaust mods or engine swaps.

I will say one thing though, twin mitsu td06h are perfectly sized to run a low boost setup on the 2.7s good for 300 hp

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[PaulE]

Originally Posted by michaelpetersen3

Hi Paul, I really like the idea of the direct connect dyno. It takes one more variable (wheel rolling resistance) out of the equation. Should give you more consistent results. Im pulling 79HP/L on my 3.2. You should be able to pull 285HP from your 3.6 w/ exhaust work, maybe 290/295HP if you eliminate rolling resistance. BTW, if you want to see the details on my exhaust mods and dyno results, I posted a vid several years ago here: https://youtu.be/MdCQg2tJFYg.

Thanks for the video Michael. Interesting that the Max Flow mufflers actually make a little more HP than the Super Cup ones! I've already got those same Fabspeed headers with 200 cell catalysts, so if I get the itch for more power, replacing my CircuitWerks mid pipes and stock muffler would be the next step.