To clarify does this kit use the original TB (74mm)? How much for the kit in dollars ($) shipped?

It does use the 74mm throttle body, which is not the original 986 TB (68mm).
Price with shipping to the US in USD is $540.
Price is based on 450€ base price, and change rate change everyday (and paypal has its own rates...) so $540 is an indication.

Ben.

Holy Mother of God! I was chastised over this post and 1 1/2 years later the great Jake Raby says the same thing I did about the air being pulled along the short side radius. The Y shape is the most important part of the piece, even according to Jake Raby.

https://rennlist.com/forums/996-forum/944002-alternative-to-ipd-plenum-2.html#post13767949

:cool:

Is there a similar solution for the 2.5 engine?

Nope, not from me yet :/

I should do a before/after dyno comparison soon !

Well... when my car comes back from the lift and passes inspection ...


Ben

so 4 years on and it still isn't available to buy or have any dyno results etc? crazy

It's only crazy if you think this is what he does full time, for a living.
It's not. He spends the time (and money) here and there when he can. Which isn't a lot, since he's also a full time student.
His work is absolutely first rate, and he's been very helpful to the community.

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Instead of denigrating the efforts of Ben, why not offer some suggestions of how to improve his product or development process ?
We need more talented, motivated and generous members like Ben to support the Boxster. with after market products. Snarky comments are unlikely to encourage such helpful members.
Big companies are not going to create such products for such a small, declining market so THANK YOU BEN !
Yes, I was one of his first customers and the product works perfectly and was great value.
So I am a grateful, biased user .

THIS. a hundred times this.

I've got Ben's shifter, and I'm looking forward to his improvement to it becoming available.
I'll likely be lined-up when the plenum is available as well.


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What they said. Ben’s customer service alone has me sold on his products

Thanks guys for the support :D
I don't think he was serious, but I think I made pretty good progress in 4 years !
The plenums are available (and carbon fiber!), there's two coming in the US with Uniwerks Design !

I'm not a student anymore, I moved back home and I'm a full time Porsche tech, and doing my stuff the rest of the time :)

There are three plenums left, two that will arrive at Uniwerks Design soon, and one here with me.
Ten more are coming. I'll try a new thing for the AOS tube soon.

I found a guy to dyno the car... now the hard part is to find the time !

Talking of plenum, I recently made one for my 928 !
It's just a prototype for now, but looking pretty good already !
https://i53.servimg.com/u/f53/13/27/76/86/mnys6110.jpg

Thanks again to all of you :)


Ben

Hi Ben,

a little idea for improvement. The both ends of the T that lead to the hoses should have a little hump, so that the hoses can't get of the tube.

Another question: how is the T formed inside? Is there an air guidance?

Where are you located in France? I saw your video driving on Auneau Du Rin. If you live near there maybe i can help with searching a dyno near the border in Germany.

Regards, Markus

The previous 3D printed ones had the small humps you describe, but after trying with and without, it doesn't do much. They were good to help the porous 3D printed parts with sealing, but on the CF part, there is no problem at all :)

The inside of the plenum is a regular T shape, with larger radiuses to improve flow.
I didn't use a Y shape for various reason.

I live in the south, on the Riviera :)
Which video was it ? Because I never went (unfortunately for me ^^) on Anneau du Rhin.

I go back on track in two days ! Hopefully the gopro stays in place more than 5 minutes this time ! ^^

ah ok i did not know about his background. I clicked on his website, and given that he has a company name and a proper website, the natural conclusion was that this was a company doing this. apologies for any offence, Ben.

"i can help with searching a dyno near the border in Germany."
Well done Markus ! That is the best of this Forum - helping each other :-).

No worries :)
I do have a company, but I still work 8am to 6pm as a Porsche tech, so I can only work at making my stuff around an hour per day... that's not enough to do everything I want unfortunately :/

And add to that three project cars and time to socialize and take care of my girlfriend ^^

It's a fulfilled life ahah

Today I finally got the chance to take the Boxster on the track !
This time I came prepared and had no oil problem, so I enjoyed four 20minutes sessions of fast driving ! Keeping the engine below 6000rpm, I still kept up with way faster cars : 981S, 718, 718GTS, E46 M3 !
A wonderful day !

Which track did you go to, Ben?

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A small track in the south of France.
"Le Luc"

I'll post a video ;)

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.

Very nice Ben.
and fairly priced if i might add.
keep the good work.

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

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

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 !

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

Getting its new coilovers too !

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:

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 :)
https://i53.servimg.com/u/f53/13/27/76/86/img_0134.jpg
https://i53.servimg.com/u/f53/13/27/76/86/img_0135.jpg

And the 996 Version will be there in 2020 !
https://i53.servimg.com/u/f53/13/27/76/86/img_0243.jpg


Ben

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! :)

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 :D

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..

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 :/

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!

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 :/

Any updates on inventory of the 986 part?

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 !

https://i53.servimg.com/u/f53/13/27/76/86/img_2734.jpg

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!

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?

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

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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