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RSS Plenum DIY _ Just did it


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Just replaced my stock plenum with the RSS plenum over the weekend. I have never really done a DIY on my car so I was a bit nervous.

Thanks to Chuck Jones advice (who sold me the plenum) the job was quite simple. If I did it again I could do it in half the time.

I have to say I'm quite pleased with the performance with the new plenum. The performance is most noticible between 4500 and 6500 rpm.

The car gets to 100 mph much quicker than before. I have no idea what the gains really are.

I'm going to do a run against my friend who has a 997s coupe that is chipped. I have run against him before so I will be able to gauge the difference.

If anyone is planning to do this mod themselves pm me and I can give them some tips to make the job even easier. Tools needed are minimal. The instructions that come with the plenum are okay but not detailed enough.

:cheers:

Phillipj

Edited by phillipj
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  • 1 month later...
Just replaced my stock plenum with the RSS plenum over the weekend. I have never really done a DIY on my car so I was a bit nervous.

Thanks to Chuck Jones advice (who sold me the plenum) the job was quite simple. If I did it again I could do it in half the time.

I have to say I'm quite pleased with the performance with the new plenum. The performance is most noticible between 4500 and 6500 rpm.

The car gets to 100 mph much quicker than before. I have no idea what the gains really are.

I'm going to do a run against my friend who has a 997s coupe that is chipped. I have run against him before so I will be able to gauge the difference.

If anyone is planning to do this mod themselves pm me and I can give them some tips to make the job even easier. Tools needed are minimal. The instructions that come with the plenum are okay but not detailed enough.

:cheers:

Phillipj

Thanks so much Phillip for your feedback and input on installation tips.

I installed the part last night and put about 60 miles on the car throughout the day.

It did take about 20-30 miles of me getting on and off the gas

for the ecu computer to pick up the new airflow change and WOW! What a great difference.

My seat of the pants told me that the power curve really smoothed out a lot, especially between 5000-7000 rpm.

The more I drove the stronger that pull got throughout the day.

I then took it to the dyno today as well and I am very pleased.

I saw a before and after change of 10 hp and 10 lbs of torque between 2000-5000 rpm.

Then wow... from between 5000-6000 I gained 20 hp because my power curve use to flatten

out right before the vario cam kicked in and now it just soars and keeps climbing through the old flat spot..

From 6000-7000 rpm the hp gap goes from 15 back to 10 hp up over the old curve...

I really am impressed With the difference. Especially the smoothed out curve and 20 extra hp @ 5400 rpm.

I wish it continued all the way through the rpm range, but I have to say I am a believer now.

I paid about the same price for the powerchip upgrade, but only gained about 10-13 hp. This has

to be one of the best and easiest upgrades yet. I am very happy with it and have seen and felt

the real world difference of this product.

Take care... just wanted to share my findings with you..

Billl

Edited by qikqbn
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  • 2 weeks later...
  • 2 months later...
Can you post your before and after dyno's? After reading both your impressions this is something that is getting more and more intriguing to me.

Thanks in advance,

Pete

Hey Pete,

Now that I have had the plenum on for a couple of months I am still really happy with how it "smoothed" out the power band.

Dyno's are taken with a grain of salt. I recently found a different dyno jet shop closer to my house and had a dyno done

a few days ago. There is a 10-15 hp power difference between the 2 dynojet shops.... Ofcourse you have to always consider

outside temperature, fuel quality and all the misc factors that go into dynoing any car. No two days will ever be exactly the same....

The best thing I can say about the IPD Plenum is that there is a definite increase between 5000-6500rpm. This is where

the power really smoothed out and stayed consistently higher than before the plenum was installed. I saw a 15-20 hp difference

between 5000-6000 rpm. It was mostly due to the fact that prior to the plenum there was a dip or flat spot in power just before the resonator valve opens and vcam switches. The Plenum really helped smooth out that flat spot for me and increased the power. So for me the plenum was worth it.

Outside of that rpm range the plenum increase for me is 5 maybe 10 horspower across the rest of the rpm range.

I did some stopwatch times. I know these are not super accurate to press the stopwatch while driving, but still good to see

a general idea of where the car is at performance wise.... 3.4 liter boxster.

0-60 mph = 4.4 sec.

0-100 mph = 10.8 sec.

0-130 mph = 19 sec.

0-150 mph = 29 sec.

Edited by qikqbn
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