Intake plenum and 911 throttle body - Page 24 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

jaykay · 12-25-2019, 02:52 PM

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 · 12-26-2019, 07:12 AM

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 · 04-24-2020, 07:43 PM

Any updates on inventory of the 986 part?

Ben006 · 04-25-2020, 12:05 AM

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 · 09-21-2020, 06:39 PM

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!

ike84 · 05-18-2021, 06:04 PM

Quote:

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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Ben006 · 09-22-2020, 12:11 AM

It will rub on the engine cover :/

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

Ciao · 09-22-2020, 02:53 PM

Quote:

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 · 05-18-2021, 10:47 AM

Quote:

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 · 05-18-2021, 11:23 AM

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

Ben006 · 05-18-2021, 10:03 PM

With my plenum the throttle body stays in the normal position and doesn't rub anywhere.

With 911 plenum it's another story

Ben006 · 05-19-2021, 12:30 AM

I did a bit of reverse engineering on my own part now that I have a scanner !
here is the superposition of a stock 986 plenum, and my carbon fiber one !

As you can see, the transition is more straight between the two tubes and it has nicer bends.
For that I had to move the throttle body to the left and forward a bit to clear the starter solenoid !
What took months before would take only hours now !

ike84 · 05-19-2021, 05:02 AM

Quote:

Originally Posted by Ben006

I did a bit of reverse engineering on my own part now that I have a scanner !

here is the superposition of a stock 986 plenum, and my carbon fiber one !

As you can see, the transition is more straight between the two tubes and it has nicer bends.

For that I had to move the throttle body to the left and forward a bit to clear the starter solenoid !

What took months before would take only hours now !

I'm not sure how that would fixing the rubbing? My 996 plenum is a straight T and the issue is space between the starter housing and the engine cover, not the angle of the plenum. Also, if you've changed the angle/location of the TB, is there enough play in the stock piping to make up for this? My stock intake is long gone but from what I remember there's very little if any play in those accordion sections.

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Ben006 · 05-19-2021, 05:22 AM

Well, mine doesn't rub because the throttle is where is was stock. No above the starter solenoid wich makes it too high.

you can not reuse the stock intake tube if you go to a bigger throttle body.

Rpetrecz · 09-08-2021, 06:57 PM

Quote:

Originally Posted by Ben006

Well, mine doesn't rub because the throttle is where is was stock. No above the starter solenoid wich makes it too high.

you can not reuse the stock intake tube if you go to a bigger throttle body.

Now that some time has passed. Any luck with some dyno runs? Curious to see the numbers. Definitely interested if theres some good gains and they come back in stock.

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Ben006 · 09-08-2021, 10:45 PM

Not really unfortunately, I've been too busy building the company for the last 6 months :/

I have a customer that picked up around 30Hp with the plenum, exhaust, and a tune on his 2.7L 986.

Right now I'm testing the 996 version. it still needs a bit of work...

I had a youtuber that was supposed to come (piston Kirk) but due to COVID he couldn't make it. We'll see in the winter if he can come and we'll do a back to back dyno with the plenum installed and removed.

Ben

Rpetrecz · 09-09-2021, 06:52 PM

Quote:

Originally Posted by Ben006

Not really unfortunately, I've been too busy building the company for the last 6 months :/

I have a customer that picked up around 30Hp with the plenum, exhaust, and a tune on his 2.7L 986.

Right now I'm testing the 996 version. it still needs a bit of work...

I had a youtuber that was supposed to come (piston Kirk) but due to COVID he couldn't make it. We'll see in the winter if he can come and we'll do a back to back dyno with the plenum installed and removed.

Ben

The shop I work at has a dyno if you’re going to get these back in stock soon and want some solid data

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PaulE · 09-10-2021, 12:02 PM

Quote:

Originally Posted by Rpetrecz

The shop I work at has a dyno if you’re going to get these back in stock soon and want some solid data

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And I'm a customer of that shop if you need a car to test it on! They already have the "before" dyno data on my car!