Intake plenum and 911 throttle body

[Spyder_Man]

Add me to the list of individuals eager to see the dyno results for using this intake kit both without and with a tune.

[Ciao]

Originally Posted by Ben006

Hi guys !

The first two plenum have finally landed in the US !
Available here : https://uniwerksdesign.com/product/porsche-986-carbon-fiber-intake-plenum/

There're ten more coming by early July.

I have to do an oil change on the Boxster and I'm off to the dyno, I contacted the guys and we agreed on how to do it.

I'll do two passes (after driving for half an hour, so everything is already up to temp), swap the plenums on the dyno, then do two other passes. That's the most accurate way of doing it without spending a full day on the dyno...

In the future I'll get it tuned too, we might see a good increase in HP there too !


Ben.

My interest is growing; rightly priced! Let's see the dyno

[Ben006]

I'm waiting on the new oil...
I decided to switch to a thicker 10w50 oil, but haven't received it yet.

I can not wait to finally know how much gain there is !

I've been running the 74mm on the 2.7 and the 3.2 for a few years now, I know it performs well, but putting an actual number on it will be awesome !

[Ben006]

I should receive the oil tomorrow !
The car is already on the lift and empty

Getting its new coilovers too !

[Robert986]

Hi all, let me start by saying that I really admire this work, love it!

I am in the middle of my Winter-projects, got a 987 airbox incoming, 987 MAF on order, 996-TB. I´m torn between the 997 plenum and Bens beautiful creation.. If I where to keep the standard airbox/MAF I would not hesitate, but with the 987-airbox the MAF will end up just behind the oil cooler. Anyone knows how this would line up with the angle of the Ben-plenum? I realise that the kit won't work, maybe there should be another kit for us who wants to go further and add the 987-box? Any thoughts? :dance:

[Ben006]

Hi !
Thank you for your comment

The kit will work with the 987 airbox and MAF housing, I have at least two customer doing the same thing, one on a 986 2.7 and the other on a 550 edition (which has a 987 airbox from the factory).
You will just need to find the correct intake tube to connect the two. If I remember, a long 45° silicone elbow works.

By the way, the new version is out, and it features a quick disconnect to reuse the factory AOS hose, making the installation simpler and getting rid of the silicone hose I was using previously



And the 996 Version will be there in 2020 !



Ben

[Robert986]

Thanks for the answer Ben, good to know it will work with the 987-airbox. I do Believe your plenum is better then the 997-plenum (that I have considered) since it enables a smoother overall bend.

I sent you a pm btw!

[rfuerst911sc]

Hey Ben what's the possibility of making intake manifolds that are sized like the 996 but with the bolt pattern of a 986 ? The increased size of intake plenum and throttle body would be enhanced by the larger runners of the 996 . And by making the mounting foot print the same as existing 986 eliminates the drilling of the heads . Just a thought to expand your catalog of parts

[Robert986]

Originally Posted by rfuerst911sc

Hey Ben what's the possibility of making intake manifolds that are sized like the 996 but with the bolt pattern of a 986 ? The increased size of intake plenum and throttle body would be enhanced by the larger runners of the 996 . And by making the mounting foot print the same as existing 986 eliminates the drilling of the heads . Just a thought to expand your catalog of parts

I had the exact same thought, just two thoughts on this topic:

1) On the 996 intake there are aluminium "runners" 99611010152 between the plastic part and the engine, I honestly don´t understand why, however, a custom intake would then need to cover also the alu part to get the 986 bolt pattern. Actually, to adress the bolt pattern issue only the 99611010152-part with custom bolt pattern would need to be made.
2) I think that the "real" issue with the 996 intake is that it does´t fit in the bay without lowering the engine quite a lot.. So if this could be adressed while maintaining the flow characteristics of the 996 part you would have a winner!

Quite a big/complex part to manufacture i guess..

[Ben006]

You would have to port-match the heads too... pretty expensive job.

To me, it's not worth it.
Though if you really want to I'm able to make the spacers to fit the 996 intake on to the 986 heads.
With a 987 engine cover it should fit.

But then, without camshafts and a proper tune I don't think it's worth it :/

[jaykay]

Ben,

I believe the 996 intake runner port size and the 986 are the same. They are the same head to the best of my knowledge.

At a high level, you would need to: laser scan the 996 aluminium intake runner left and right bank parts; develop the 3D model; adjust the height if possible (not sure this would be easy to adjust without negatively impacting geometry); map the 986 head holes onto the bottom flange of the model; incorporate fastener feature up top as needed; 3D print in suitable material.

I am not sure about fuel rail and injector fitment

Please make this. I have been wanting adapters for years!

[Ben006]

If they are the same heads, then no need for an adapter ^^
The 3.4 engine fits in the 986 so we know there is room too !

No need for a laser scanner, it’s a human that designed it, humans like round number and geometrical disposition

It’s not hard to design, but won’t be cheap and won’t give big power gain if any.

I still think the intake manifolds on the 986 aren’t restrictions.
The small throttle body and tiny airbox are major restrictions, the rest is large enough for the stock cams/valves and displacement. And the closer you are to the valve the more you can mess the accoustic tuning of the intake and risk losing driveability :/

[aparke4]

Any updates on inventory of the 986 part?

[Ben006]

I have one left in stock ! But there is also one coming to the US for Uniwerks design. Due to the situation, I don't think he received it yet !

[Newsguy]

Though this thread is few months old, it seems the best spot for my question.
I've fitted the 997 'T" and 74mm TB. For clearance reasons, can I mount the TB with the actuator block on top rather than the side? There is enough cable to rotate 90 degrees but will it work fine in that configuration? I don't see any obvious reason it would care, but one of you might have contrary information.
Thanks!

[Ben006]

It will rub on the engine cover :/

There’s a reason why I bother making it like that

[Ciao]

Originally Posted by Ben006

It will rub on the engine cover :/

There’s a reason why I bother making it like that

tell me about the 996 version? Will it work on a 986 w/74TB?

[joshua3m]

Originally Posted by Ciao

tell me about the 996 version? Will it work on a 986 w/74TB?

Amazing job specially that it's looking so great.

Then what's actual gain in HP with the install ?
Tuned and without tuning ?

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[Ben006]

Hard to tell until I dyno one.
Hopefully this summer I'll have a guinea pig to dyno one

[ike84]

Originally Posted by Newsguy

Though this thread is few months old, it seems the best spot for my question.

I've fitted the 997 'T" and 74mm TB. For clearance reasons, can I mount the TB with the actuator block on top rather than the side? There is enough cable to rotate 90 degrees but will it work fine in that configuration? I don't see any obvious reason it would care, but one of you might have contrary information.

Thanks!

Yes, u can mount the TB in any position you want so long as the connector reaches to accommodate fitment. I have mine (82mm on modified 996 cable driven plenum) mounted with the actuator on the driver's side. I'm not sure if Ben was replying to your post but it makes contact with the engine cover but it has not caused me any problems after driving like that for several hundred miles. I don't think you will have this issue though since the 74 is smaller. You can see the pic in my diy thread.

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