Intake plenum and 911 throttle body

[jsceash]

I'm not saying in any of this that the 997 T body mod is bad, or the IPD is the best. Each has it's place and both have compromises. Members of the forum who haven't bought one have justified their decision based in rumor or hear say and COST. I guess the $795 is high when compared to the $299 for Pedro's upgrades (some reason not available for our years any more), but why would Softronic's slam IPD. FYI they make a kit, aluminum T and tune $1975 ouch. Sometime there are ulterior motivation. I'm sure if you called Pedro to solicit an opinion he put down Softronics. I you called IPD they would down play Pedro's Kit. There each in the market to sell their product. Suncoast Porsche sells only IPD products. They state its an improvement over the stock Porsche parts but it's still $795.

[KRAM36]

Originally Posted by jsceash

The flow would be very close in both systems with the Large radius T maybe even having a slight advantage for RPM below the point where the secondary tube damper opens. The second the secondary tube dampener opens, the IPD has the 997 tube hands down. Once the cylinder pulse has a secondary route the wedge no longer has to deal with the back flow.

I get a significant power and torque boost at that point.

That's interesting. I don't get a sensation of extra boost through the RPM band. I get a steady very strong pull across the RPM band. Feels like I'm driving a small block V8, put the throttle down and I get a steady relentless pull to the next gear. After I got done with the intake mods and took it out for the first time, I knew it had added a lot of power.

[Ben006]

Thanks everyone for the clarification on what's going on inside of that T

I will try my best to give you accurate result of before and after the installation (on my car, wich is now in fairly good shape). But I don't think I will be able to dyno it :/

as I said, the main advantage of my plenum over the 997 plenum (which I recon, is a good deal), is the perfect fit "as original". Is it worth it ? I think it does !

Ben.

[heliguy]

If your plenum has any advantages and it's plug and play, then I'm in. I'm looking for simple installation with a hp gain at a reasonable price.

[BRAN]

Awesome project

My IPD intake plenum package should arrive soon, breathe baby breathe ...

[BRAN]

Originally Posted by BRAN

Awesome project

My IPD intake plenum package should arrive soon, breathe baby breathe ...

It is installed, finally: "Not cheap, but good investment"...noticeably more "umpf" through all ranges... pulls & sounds better = more smiles per gallon

[Ben006]

NO I have not forget !
I'm just very busy and it's raining everyday in south florida (no garage...) :/



It fits ! really well ! but ... my intake tube does not ... so again, I have to wait for parts...
and my paypal account is locked ...
yes, i'm out of luck ^^

soooo, next time ...

[heliguy]

It rains everyday at about 4:00! That one looks like aluminum, I thought they were going to be 3D printed.

[Ben006]

yep, almost everyday, and when it's not raining, you're frying :/

it's heat insulation

I figured that I can have a bigger radius, so the next ones will be even better

[heliguy]

Got ya, so when's it gonna be ready for sale?

[Ben006]

I really don't know :/
My paypal account is locked for 4 weeks (because it was created before I was 18...)
so I can't buy the parts I need for the intake tube...
And in the same time I'm studying for my ASE cert, my finals, and I'm going back to france the 25th :/

[heliguy]

:'-( We want it.

[Ben006]

Me too ... it takes way too long but I have priorities

[Ben006]

Hi !
I receive a new elbow coupler. you should get news soon

[Ben006]

Ok ...

I know, it's been a looong time no news...
I've had some problems and more important things to do over the last months :/

Now, I have a new clutch, AND a new IMS bearing, AND a new flywheel AND the intake tube fitted !
That means my car is ready to get the plenum fitted !

I will try to do it this weekend if it's not raining !

By the way, switching from a 987 to a 986 clutch sucks ...

[Ben006]

It's IN !
And working !

https://www.facebook.com/benjamin.nenert/videos/10207860314604181/?l=7273786639763200972

The idle is slightly higher, probably due to the fact that I didn't do an ECU reset, but I should !

I drove it for 1/2h without problem, but I need a hose clamp and some heat shrink since mine is not a final version ...

I did a test run, @25°c and 85% ambient humidity.
0-10 km/h: 0.99 sec
0-20 km/h: 1.90 sec
0-30 km/h: 2.53 sec
0-40 km/h: 3.16 sec
0-50 km/h: 3.74 sec
0-60 km/h: 4.35 sec
0-70 km/h: 5.02 sec
0-80 km/h: 6.59 sec
0-90 km/h: 7.47 sec
0-100 km/h: 8.35 sec
0-110 km/h: 9.28 sec
Elapsed Time
60': 3.41 sec @ 39.5 km/h
330': 7.63 sec @ 87.4 km/h
Miscellaneous
Max Speed: 113.4 km/h
Max Acceleration: 0.49 G's

It's not a hard launch, I went on the throttle after 2000rpm, and I think the road goes up slightly.
Sorry, it's metric

I will put everything back to original tomorrow, for the week, and do another timed run on the same road to compare (I forgot to do it before).

I will also try with a ECU reset to see if it improves.

Ben

[jaykay]

Please do some roll on tests from 3K in third and fourth gear
What did you use for timing?

[Ben006]

I'll try, but on open roads it's going to be quite hard to do a 3000 to 7000 in 3rd and 4th!

I used Dynolicious, it has always worked quite good for me, the thing is to use it to compare, not to get an absolute result. And always get measurement on the same road going the same direction.

[Ben006]

I just reset the ECU, we'll see how it does tomorrow.

I tested the intake at up to 240F, but I measured only 150F after a drive, so it should be good from a temperature point of view

[Ben006]

Hi !
Just did 55miles today on my daily commute, and everything worked fine !

I only did one pull WOT, and yes, it feels more powerful even on the first gear (1st gear pull are usually not showing great improvement due to flywheel inertia).

The intake sound changed too ! louder at any speed when you put your foot down !
I wanted to make a video at home, but my neighbours were there trying to rent their condo, therefor I couldn't rev the engine, it would have looked bad !

I'll try with the dashcam if I don't forget it.

Also, I found a better way to measure the effectiveness of the modification.
Taking acceleration measurement is hard because you have to repeat the exact same procedure each time.

So instead, I'll use my OBDII scanner to get MAF readings.
What we want with the plenum is better airflow at WOT, and it's easy to see it with the scan tool.
We'll see if there is an improvement over stock, or it's just the noise that makes me feel that.
I just have to do pulls from 1000rpm to 7200rpm in any gear to compare.
As long as the weather conditions are the same: Today 29°C and 55% of humidity.

Ben