Has anyone fitted 968 cooling ducts?

[Diver944]

ORIGINAL: sawood12

I think my car already has these fitted. I think you can see them in my pre-big black install photo attached below....

Yes thats the ones, they take air straight through the front bumper and I am guessing they are more effective than the 968 scoops which just stick out a little underneath.

I used to wax lyrical about how good M030 brakes were [8|] and I think it's because of those ducts, plus the fact that I had flexi ducting from the duct straight to the back of the brake disk. Scott, I still believe I had plain and simple brake fade due to boiling the fluid but Jon will strip everything down when the car comes back from the bodyshop and replace the master cylinder as well for good measure whilst installing the big blacks and Castrol SRF fluid (and a ruddy great anchor in the boot, with the parachute)

Foolishly I removed my flexi ducting when I fitted my new track wheels as I noticed they were fraying (after three years), and because I now had PF97 pads fitted, uprated brake fluid and was only running at 12psi boost before the car went down to Jons I thought it would be fine. Hindsight is truly wonderful []

 

[944Turbo]

The 968 scoops stick a long way under. The through the arch scoops were dropped on later turbos I feel the curve in the undertray provides a lot of air towards the disc at speed, which is my main reason for not fitting a splitter. I have also heard it said they were removed on cost grounds though. However I have additional ducting fitted as well - I persuaded some universal ones (from demon tweeks) in behind the lower grills and have some tube that points in the general direction of the disc. I still ended up with blue discs after the day at donnington though. IIRC it is frozen rotors that do the 968 duct kit in the states, but finding them on the site is tricky - there was talk on rennlist of the genuine parts being much cheaper direct from OPC ad brackets being easy to fabricate.
Bearing in mind that Porsche generally advance things through engineering analysis one day I will get round to fitting the 968 bits as well,
Tony

 

[944Turbo]

ORIGINAL: 944Turbo

The 968 scoops stick quite a long way under. The through the arch scoops were dropped on later turbos I feel the curve in the undertray provides a lot of air towards the disc at speed, maybe more than the ducts, which is my main reason for not fitting a splitter.
I have also heard it said they were removed on cost grounds, and I have fitted additional ducting as well - I persuaded some universal ones (from demon tweeks) in behind the lower grills and have some tube that points in the general direction of the disc. I still ended up with blue discs after the day at donnington though. IIRC it is frozen rotors that do the 968 duct kit in the states, but finding them on the site is tricky - there was talk on rennlist of the genuine parts being much cheaper direct from OPC ad brackets being easy to fabricate.
Bearing in mind that Porsche generally advance things through engineering analysis one day I will get round to fitting the 968 bits as well,
Tony

 

[Fen]

I have no recollection of the cost, but I got the 968 parts from Exeter OPC.

Actually I do remember - I'll sell them on at cost... They were £7k and I'll even throw in the rest of the car if anyone wants them.

 

[Neil Haughey]

ORIGINAL: Fen

I have no recollection of the cost, but I got the 968 parts from Exeter OPC.

Actually I do remember - I'll sell them on at cost... They were £7k and I'll even throw in the rest of the car if anyone wants them.

Lol, 968 ducts cost about 40 quid for all 4 parts from your local OPC.

 

[944Turbo]

I am still tempted but I am struggling to justify owning 2 to myself never mind anyone else mine would need work before I could sell it for good money and if the work was done I wouldnt want to sell it, Yours has a lot of the bits mine needs - IIRC rebuilt gearbox, rebuilt rear beam, wheel bearings, rust free boywork, etc etc. plus some bits that would be nice or could be sold on KWs, standalone, sticky rubber, uprated geabox anengine mounts etc etc. I would end up with 2 Quick 944 Turbos which while nice isn't strictly neccesary, especially without a garage to keep them in, and not having driven the one I already own for more than a month as the MOT has run out and it needs a service.

Now show me some pictures and change my mind

Tony

 

[Hilux]

Scott, I still believe I had plain and simple brake fade due to boiling the fluid but Jon will strip everything down when the car comes back from the bodyshop and replace the master cylinder as well for good measure whilst installing the big blacks and Castrol SRF fluid (and a ruddy great anchor in the boot, with the parachute)

People tend to forget the rear brakes. The rears do not get a lot of air past them and can also fade. If they fade then the fronts will work twice as hard. I know as my Westy used to have the back try to overtake the front when hot and a lot of the Westy boys add in ducting to the inside of the rear discs.

Paul, you have a v powerful car but good pads and fluid. You will approach bends much quicker than most of us. Consider the rears as well??

 

[Fen]

ORIGINAL: 944Turbo

I am still tempted but I am struggling to justify owning 2 to myself never mind anyone else mine would need work before I could sell it for good money and if the work was done I wouldnt want to sell it, Yours has a lot of the bits mine needs - IIRC rebuilt gearbox, rebuilt rear beam, wheel bearings, rust free boywork, etc etc. plus some bits that would be nice or could be sold on KWs, standalone, sticky rubber, uprated geabox anengine mounts etc etc. I would end up with 2 Quick 944 Turbos which while nice isn't strictly neccesary, especially without a garage to keep them in, and not having driven the one I already own for more than a month as the MOT has run out and it needs a service.

Now show me some pictures and change my mind

Tony

The gearbox was the bit that wasn't touched, neither rebuilt nor upgraded mount. I'm not selling it if you're only going to strip it for parts anyway []

At risk of hijacking the thread here's one of my faves. I haven't got any pictures recently. In fact I think I last saw the car a few months ago. I'm toying with several options just now; I don't really want to sell it and I wouldn't really notice the money if I did, so I guess the reason it's available is because I can't really put much time into it just now nor do I reallly want to spend any more money on it at them moment, but I have to do something as I can't leave it where it is and move to NZ.

 

[sawood12]

ORIGINAL: zcacogp

I'm lost .... anyone got pictures?

In the piccie above, I guess the air duct is the end of the rectangular-section pipe that pokes into the wheel arch at the front - non?

So, given that I know what is on the struts of an S2, what is on the struts of a 968?


Oli.

Yes, the rectangular hole in the wheel arch is where the through-duct directs the airflow into the wheelarch with the strut mounted scoop supposed to deflect some of the air onto the back of the disc - even though there is a disc dust cover preventing the airflow actually getting onto the disk. I would imagine it would be only effective when driving in a straight line.

The 968 scoops are mounted horizontally on the lower wishbones and scoop air from under the car and the strut doesn't have anything fitted to it at all.

Who knows why they went to a different system on the 968, it might not be because the 944 system was ineffective but either way no system is anywhere near as effective as having a hose to direct 100% of the airflow onto the disc. It's a shame no-one makes a rectangular to round funnel you can attach to the rectangular 944 duct so you can mount a hose. I've also seen a plate assembly that attaches to the rear of the hub and funnels all the airflow from a duct directly into the disc forcing the airflow through the internal passages of the disc to exit around the rim. This has to be the ultimate setup. In any case with Big Blacks it appears that no cooling is necessary - at standard power levels at least, as proved by Andy Sweatenham who uses standard disks and pads with his big blacks and he seems to get round OK.

Talk of replacing the master cylinder is very sensible, espeically when you look at the cost of them. They are cheap as chips. I am also suspicious of the ABS unit. It's been sitting under the wheel arch liner for 20yrs and seems to have a hell of alot of brake pipes going in and out of it's housing with many opportunities for a seal to suddenly stop working. I'm not even sure how effective the unit is - it doesn't seem to be that effective on my car. I wonder if it is possible to retrofit an ABS unit from a more modern car?

 

[TTM]

Yes Scott, there is an additional plastic duct mounted on 968 struts. It comes sort of "in line" with the duct mounted on the wishbone.

Fen, stop beating about the bush with your car and bring it back to at least road-worthy spec instead of messing around with dull estates []

 

[hotblack944]

ORIGINAL: Fen
I wouldn't really notice the money if I did

So give it to me [][][]

 

[zcacogp]

TTN - thanks. A pic is worth a thousand words. That one helped a lot.

Scott, such a retangular-to-round funnel can't be hard to make with a bit of sheet aluminium and a pop riveter. And some sealant to ensure that the joins are all air-tight, if you wanted to do a posh job of it. You would then run a hose from the back of the hole in the bumper to the round end of the funnel and Bob would be your uncle. The problem as I see it would be to arrange enough support for the hose where it travels from the back of the bumper to the funnel, as you would risk having it catch on the inside edge of the wheel.

As far as the ABS goes, what do you mean when you say that you don't think the unit is effective? I have had the ABS on mine working on one occasion for sure (an experiment on a greasy road at 40ish MPH, as I have never had a car with ABS before.) I can't comment on how well it would stop the car compared with a modern system (almost certainly not as well). Retrofitting a modern system? Could be a complete pig of a job. There's quite a lot to an ABS setup. You could try and use the existing wheel sensors, but you would need a new control unit and a new ECU. And then interface it into the existing braking system. But that's a bit much of a project for a Sunday afternoon.

Fen - that's an interesting pic. For some reason I always thought your turbo was black, not sure why. What are the sill trims on it? And is it really as lowered as it looks, or do the trims simply hang lower down the side of the car?


Oli.

 

[Fen]

Oli,

That pic makes it look a bit lower than most and yes the skirts (which are from a 968) do hang a bit lower than the sills. It's never been black though.

Thom,

I like estates, and I also like acceleration, hence an estate that can accelerate really appeals to me. It's nice to know you can get a wardrobe from 0-100 in under 12 seconds if you need to.

 

[Diver944]

ORIGINAL: zcacogp

The problem as I see it would be to arrange enough support for the hose where it travels from the back of the bumper to the funnel, as you would risk having it catch on the inside edge of the wheel.

I wish I had a pic of my setup to show you how to route it.

Basically I had 1.5 metres of 3" diameter flexi brake hose from Trident Racing Supplies at Silverstone. Cut in half it was simply Duct Taped to the rectangular aperture in the bumper and then by means of two small holes in the plastic inner wing it was cable tied to hug the inner edge of the wheel arch before turning 90 degrees to point to the disk when level with the PAS pump. It was then bolted to the strut with two bolts and large washers using the holes left behind after removing the standard metal deflector plates.

Sounds very Heath Robinson but it was aesthetically quite pleasing to the eye and it stayed in place happily for over three years, 30k miles and umpteen track days. More importantly if you held a hair dryer to the front of the bumper you got a great big blast of air into the centre of the disk. The same hairdryer without the ducting yielded barely a trickle of air

 

[Hilux]

is it really as lowered as it looks, or do the trims simply hang lower down the side of the car?

I fitted KW V3 on Fens recommendation, guess which is my car [] Fen`s has KW fitted also.

 

[Diver944]

That pic doesn't show 17 of us Register members sitting in your car checking if the ashtray bulb is illuminated []

 

[TTM]

ORIGINAL: Hilux

That seems a bit too low. Any issue with tyre rub ?

 

[Hilux]

None, loads of room. []

Its also got mahoosive Weltmeister ARB`s (also as per Fens recommendation) so the body roll is minimal [8D]

 

[Hilux]

That pic doesn't show 17 of us Register members sitting in your car checking if the ashtray bulb is illuminated []

ROFLOL,


Damn, I was hoping no-one would mention that one [][][][]

 

[edh]

I've just ordered them from OPC Exeter - GBP 44.11 for all the parts inc nuts, bolts & washers.
- should be on the car before Silverstone next Tuesday