968 Ducts Fitted

[edh]

That was a straightforward job - for once []
(Easier if you fit the lower part first though) - approx £50 from Exeter OPC with all the bolts etc..

Pic isn't great quality - cameraphone in low light.

 

[Big Dave]

So how did you fit the lower flaps.?? Or have you got 968 alloy arms fitted ,, with the lugs.??

 

[edh]

I think later turbos and S2's had the same arms as the 968 - they bolted straight on []

968 arms have a 944 part number

 

[TTM]

Late turbos and S2's did not have 968 arms.
I would bet your car was fitted with 968 arms during its earlier life - just like mine.
The problem with 968 arms is they aren't easily rebuildable as 944 arms as worn out ball joints cannot be taken out without machining the arm.

 

[John Sims]

Shall we start a sweep now as to how long the sticky down ears last. []

Looking at the design I am wondering how much more air they move compared to the "through the grill" standard 944 ducts.

 

[edh]

ORIGINAL: TTM

Late turbos and S2's did not have 968 arms.
I would bet your car was fitted with 968 arms during its earlier life - just like mine.
The problem with 968 arms is they aren't easily rebuildable as 944 arms as worn out ball joints cannot be taken out without machining the arm.

968 arms have a 944 part no & PET lists these same arms were for '90 model year onwards 944's. - I had assumed this meant they were fitted from new

John - at least the "ears" are in line with the wheels so will get the max possible ground clearance (and they are very cheap to replace). Later turbos didn't have the ducting through from the bumper, just the deflector on the duct. I think Promax are selling the ducting, but it's 3x the cost of this option. The shape of the upper part looks like it will be pretty good at firing the air into the centre of the disc.

 

[TTM]

ORIGINAL: edh
968 arms have a 944 part no & PET lists these same arms were for '90 model year onwards 944's. - I had assumed this meant they were fitted from new

You had assumed right, however :
- The first three figures of the part number are not directly related to the type of car. If you look at specific 968 parts you will also find part numbers starting with "944". Only a handful of 968 turboS/RS parts started with "968". One of our wastegate exhaust gasket begins with 930 IIRC. Although a bit of an extreme example, Turbo Cup cars feature parts beginning with 917 and 965.

- The part numbers listed in PET are often those of the revised part, meaning the part number of the part that was originally mounted on the car cannot be found out by browsing through the various sketches.
Examples : ABS control unit, fuel tank, PS fluid bottle.

 

[TTM]

Here is a way to fit 968 scoops to 944 arms :

 

[John Sims]

ORIGINAL: TTM

Here is a way to fit 968 scoops to 944 arms :

[] I'm not sure I would recommend drilling holes in the lower wishbone. I appreciate that it is a very small hole in, what would seem to be, an unstressed area but all castings have a level of internal stress due to the casting process.

I am no doubt being overly cautious but it isn't something I would be 100% happy with.

 

[Neil Haughey]

ORIGINAL: edh

ORIGINAL: TTM

John - at least the "ears" are in line with the wheels so will get the max possible ground clearance  (and they are very cheap to replace). Later turbos didn't have the ducting through from the bumper, just the deflector on the duct. I think Promax are selling the ducting, but it's 3x the cost of this option. The shape of the upper part looks like it will be pretty good at firing the air into the centre of the disc.

You may find that speed humps are a problem. I found that my car would straddle some humps no problem without the ducts but after fitting them they sometimes catch on the edge of the hump, nasty. Now I slow down and bump one wheel over the hump.

IMHO 968 ducts are brilliant. Pound for pound the best thing I have done to my S2.

 

[Diver944]

For the sake of £50 you 'could' supposedly regard these as sacrificial parts, much the same way as the lip spoiler on the GT3.

Ed that is the first closeup pic I have seen of the scoops. Have I interpreted it correctly in that there is an upper scoop too?

 

[edh]

That's right Paul - the lower "ear" deflcts the air upwards & it's funnelled into the centre of the disc by the upper part. I guess for even more cooling you could attach a hose to the upper part (I've taken mine out - the front scoops were just bodged in)

One ear is about a tenner - so one of the cheapest 944 parts you can buy []

 

[TTM]

ORIGINAL: John Sims
[] I'm not sure I would recommend drilling holes in the lower wishbone. I appreciate that it is a very small hole in, what would seem to be, an unstressed area but all castings have a level of internal stress due to the casting process. I am no doubt being overly cautious but it isn't something I would be 100% happy with.

Fair enough - 968 wishbones are actually strenghtened in the area of the hole.

 

[sawood12]

Havn't 944 turbo and S2 wishbones got 951 part numbers (I can't be bothered to fire up the PET!). Anyway the 968 wishbones are definately different. They have larger ball joints I think and might be a desirable upgrade. My car actually had a 968 on the nearside and a 944T on the offside. I did a trade with Hartech when I had my geometry correcting kit fitted as it was not suitable for the 968 arms.

 

[appletonn]

Scott, what is the 'geometry correcting kit'?

Just wondered...!

 

[Guest]

Were the 968 arms fitted to late MO30 cars? As my car has the 968 type arms and is a September 1991 registration

 

[Guest]

ORIGINAL: appletonn

Scott, what is the 'geometry correcting kit'?

Just wondered...!

Longer ball pins for when you lower the car beyond a certain point which seems to be under debate.
It corrects the roll centre which is affected by lowering (in simplistic terms)

 

[sawood12]

Yes, tommo is right. They also put your ball joint back in the correct region of operation. They are specifically for lowered cars where the wishbones would be flatter therefore pushing the ball joint pin outwards where, under heavy breaking and cornering, the pin of the ball joint can over-rotate and foul with the ball joint socket rim. This can lead to eventual failure of either the pin or the end of the arm itself. So this kit is a must for any car that is lowered significantly.

 

[Neil Haughey]

ORIGINAL: sawood12

Havn't 944 turbo and S2 wishbones got 951 part numbers (I can't be bothered to fire up the PET!).  Anyway the 968 wishbones are definately different.  They have larger ball joints I think and might be a desirable upgrade.  My car actually had a 968 on the nearside and a 944T on the offside.  I did a trade with Hartech when I had my geometry correcting kit fitted as it was not suitable for the 968 arms.

Was the same for me. The car had a full OPC history when I bought so I guess they must have fitted the 968 arm thinking it is better or under some direction from Porsche to fit the latter part. I went the other way to you and got another 968 arm to match since the car never handled evenly with the 2 different wishbones despite how much one could fiddle with the caster adjusters.

 

[appletonn]

Hmm, lowered significantly - that would be mine then! Where does one acquire said kit from, may I ask?

I knew this tuning lark was addictive, but I am going to have to get some 944 tuning patches at this rate...

Thanks
Nick