Did you sell me a 993 intake system at the DDK auto jumble?

[sladey]

I bought the 993 intake system off someone at the DDK auto jumble in I think 2021 at greatworth classics

I’m pretty sure he is/you are called Andy - he’d/you’d previously fitted it to a 3.2 carrera and I’m intending to do the same. You were selling it as you’d switched to jenvey ITBs after you’d helped test out their classic ITBs

I’m really sorry but I’ve forgotten your username otherwise I’d PM you

It’s been sat in a barn since I bought it as I’ve been busy doing other stuff, but I am planning on starting to fit it after I get back from CLM. Today I’ve got it all out and I’m trying to suss out what goes where. I appreciate some of it will be more obvious when I take the existing system off but I could do with a bit of help on a few things.

I’ll put the questions here

So firstly this (the black bit at the bottom with the small bell rank on it) looks like an additional throttle opening which is powered by a vacuum. Is that right and does that work on the 3.2? If so then how? - does it kick in when the vacuum gets strong enough? If I’m barking up the wrong tree completely then what is it?

Also, below the main throttle body is that silver round thing jutting out - should anything connect into there?



This electrical plug is on the top - did you plug anything into this? Do you know what it does? It seems to have vacuum lines coming out of it - one of them going to the additional ‘throttle’ in the previous pic



These vacuum lines were loose in the box - there’s a Y piece. Can you remember where they goes? (Can’t see anything obvious)


There is this hole on the back of the intake. Should this be plugged? Did you plug it? If not did something else go into the hole? Can’t see anything obvious



Finally for the time being, this connector comes out of one of the intake stacks. Any idea what this should be connected to? I don’t seem to have anything comparable on the 3.2 (unless it replaces one of the 3 connectors on the left hand side of the engine bay……


Thanking you in advance for any help you can give

Cheers

Mark


Sent from my iPad using Tapatalk Pro

[Bootsy]

My name is not Andy and I didn’t sell it to you - glad to have been of help

[sladey]

Thanks Thomas that narrows it down considerably.

I’m sure other people will know his username. At Greatworth Classics his stall was just inside the building on the right hand side

Does anyone know who it would have been?


Sent from my iPad using Tapatalk Pro

[sladey]

Bingo - I remembered I paid by bank transfers and so I found it in my old bank statements - it’s Andytat.

I’ll PM him


Sent from my iPad using Tapatalk Pro

[DustyM]

Mark,
I’ve not seen this conversation to a 3.2 before. What benefits are you expecting with the 993 intake (it’s not the Varioram version judging from your pics)

Cheers
Jon


Sent from my iPhone using Tapatalk

[sladey]

Hi Jon,

I believe it’s basically better breathing and therefore hopefully horsepower. When I spoke to Andytat before buying it he’d got a useful increase in power. RIchard Bernau on Impact Bumpers did something similar to his car - I thought he’d used 964 intakes but looking again I think they were 993

https://www.impactbumpers.com/forum/ind ... d/page/14/

Actually his was 964 intakes and with other stuff he ended up with 280+bhp

This page has more information on the reasons he did it

https://www.impactbumpers.com/forum/ind ... od/page/6/

Makes me question whether mine are 993 or 964. Either way they are going on

Edit: mine is 993. Pre variorum, it’s very similar to the 964

Cheers

Mark

[DustyM]

So will get the ecu remapped afterwards to make the most of the increased breathing?

The other thing which the 964/993 manifolds have over the 3.2 is a twin throttle butterfly which helps with driveability.


Sent from my iPhone using Tapatalk

[sladey]

Yes I’m planning on a remap once I’ve got it going again

Twin throttle butterfly. Hmmm. Is that something on the main butterfly or an extra butterfly. From initial looks the main butterfly seems normal looking but there is this extra one in the secondary tube that I understand opens at 5300 rpm and changes the primary length or something (waaaay out of my comfort zone here)

[rhd racer]

It doesn’t look dissimilar to what I did when I converted my Boxster 2.5 to 2.7 Mark, and the hardware looks identical. Not familiar with the 993 intake, but see if any of the below makes sense;
1. Boxster 2.5/Carrera 3.2 use a single flap in the intake manifold
2. Boxster 2.7/ 993 use two flaps, the 2nd opening at a certain rev range to maximise torque up to that point
3. The first flap is operated by the throttle via a lever on a pivot arm
4. The 2nd flap is operated by a vacuum and some code in the ECU
5. All those pipes with the Y junctions are about 2mm bore and they push into the rubber manifold bellows, and provide the vacuum to a small phallic shaped reservoir that is located on the top of the case. They have tiny round non return valves which maintain the pressure to the solenoid for 1 or 2 operations of the 2nd flap. They often seize (test by blowing one end) but can be brought back to life with WD40 and more blowing
6. You will need Wayne Schofield to do the clever bit and put some code from a 993 ECU into yours. On mine he added a string of 996 code to my 2.5 ECU to operate the solenoid.

FWIW my engine was new, so needed running in and I did a track day at Donington with the 2nd flap cable tied open. It was as flat as a flat thing but did run and drive, just no guts at all.

I think you are looking at exactly the same development but for a different car. Happy to help where I can, and you can come and look at the Boxster set up at the weekend if it helps

Cheers
Wayne

[sladey]

Thanks for that Wayne, and yes I was planning visiting Wayne Schofield

I’d also seen someone mention an MSD rpm-activated switch as an alternative to the ecu-activation

[andytat]

Guilty as charged -_-
I've sent you a pm Mark but if it's of interest to others
I'll answer any queries you have here.
Cheers

Andy

[andytat]

I have just looked through the photos and I'll try and answer your questions.
1st photo.
I don't know the purpose of the silver round thing but it's not an open hole to
the throttle body or anywhere else so nothing to worry about.
The black thing is a vacuum solenoid that operates the resonance flap
and connects to the vacuum reservoir via the switch in the next photo.
2nd photo.
This electrical switch is controlled by the ECU to operate the resonance flap
I think the 964's with plastic manifolds and the 993's trigger this around,
4,650rpm
3rd photo.
Vacuum lines. There is a small port either on the throttle body or intake
manifold that supplies vacuum for the resonance flap as well as the fuel
pressure regulator. There is a plastic vacuum reservoir on the left hand part
of the plastic intake as I remember. The pipework should be something like:
Intake manifold vacuum to non return valve. Non return valve to Tee piece
port 1 Tee piece port 2 to vacuum reservoir and Tee piece port 3 to solenoid
in photo 2.
4th photo.
The original 993 air temp sensor goes here
5th photo.
Wire with plug goes to a redundant air temp sensor that wasn't used and I
didn't have a suitable plug for the hole so I left it there.
I hope that helps Mark and sorry for boring the rest of you to death.

Cheers.

Andy

[sladey]

Thanks Andy - much appreciated.

No doubt I’ll be asking you more when I start doing the swap