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@Alan, could you supply a link to what you found as an equivalent replacement?
Thanks,
Gary Knox
Gary - it was a very long time ago. I used 2 different things - one that looked very much like an improved (less lumpy and more consistent) stock version. Then I swapped to yellow/black to match some intake changes. Both held up well (the first pair live on happily in another GTS).
2nd https://rennlist.com/forums/showthre...eferrerid=6055 Post #12 I believe they also had Black/Black, Black/Gray as well as other color combo's at the time (but min order was maybe 25' - enough for 2 cars easily). I can't find this anymore - though there is quite similar on the referenced site
I must admit I had a moment when I thought - hey, I can use some chimney stuff or so, but lack of time and the fact it’s a GTS made me go the easy way. I’m happy this is fixed and moving to the next things on the to do list. When these break maybe (if I have time then) I’ll try the DIY way. Thank you for sharing the links!
Thank you very much @Alan. The US Plastics minimum of 25' is a bit much! I've been using the set of 4 MB intake tubes on my S4's and GTS's for about 15 years, and currently have them on the '95. I'll probably order from K-mac Plastics if I decide to come closer to the OE setup. I took the OE ones that were on this GTS off the 3rd day I had the car and put them in the trash - after 26 years, they were truly UGLY. Kept the attaching sleeves, so a K-mac installation should be good for a long time.
Gary
PS: I still have that pix of our 5 GTS's at Denver OCIC on my hobby garage wall!
While being completely out of time for anything, in the meantime I developed that small addon.
Not sure yet when I will have time to test fit it though.
A few 928 friends in Poland already said they want one, so probably I will make a small batch after testing that design in my GTS.
Looks very close to mine ha ha. Seems not much to think of when the space is limited and you have a 3-piece shaft sleeve.
However I see some differences, I want to use this part as an addon to the factory clamp. In theory there is enough room before the factory clamp to fit my additional one. However this will shorten the lever compared to the one you linked on the 3 pieces of the shaft sleeve, so the clamping force in the end might be lower on my design.
On the other hand, I’m still going to use the factory clamp, that will be backed up by mine, so for sure it will be better that just with OE.
There is a step on the inner surface in my clamp added, as the sleeve is machined that way, that close to the factory clamp there is slightly less diameter. I want to utilise that in two ways, first it will lock the clamp in place if anything between the OE clamp and this groove on the sleeve, second - it will push the 3 pieces together most close to the OE clamp (but I’m not 100% sure it will work that way, as the 3-piece design is quite wobbly and when tightening the parts together these just get aligned to the surface, so it seems just the „lock” will be achieved).
I use 7075 T6 aluminium with helicoil inserts and M10 bolts. This should allow me to tighten safely to 79Nm with 10.9 grade bolts or 93Nm with 12.9 grade bolts.
Gary - it was a very long time ago. I used 2 different things - one that looked very much like an improved (less lumpy and more consistent) stock version. Then I swapped to yellow/black to match some intake changes. Both held up well (the first pair live on happily in another GTS).
2nd https://rennlist.com/forums/showthre...eferrerid=6055 Post #12 I believe they also had Black/Black, Black/Gray as well as other color combo's at the time (but min order was maybe 25' - enough for 2 cars easily). I can't find this anymore - though there is quite similar on the referenced site
BTW these are IMO better options - but certainly not cheap options - you pay for quality materials (or Porsche's name)
Alan
As a follow-up to this - I now find myself in need of new intake tubes. I recently installed Han's slimline fan shroud and now my intake tubes aren't long long enough to fully engage on the CAI horns & Airbox. I found www.ducting.com that seems to have the same hose material available in 12.5' lengths. I found the 3" ID hose fits the stock GTS hose ends the best. Its constructed from thermoplastic rubber, has good chemical and abrasion resistance and long term flexible performance over a -40F to +275F temperature range. Pretty ideal for under-hood usage. A good length for one or two cars ~$130 shipped.
As a follow-up to this - I now find myself in need of new intake tubes. I recently installed Han's slimline fan shroud and now my intake tubes aren't long long enough to fully engage on the CAI horns & Airbox. I found www.ducting.com that seems to have the same hose material available in 12.5' lengths. I found the 3" ID hose fits the stock GTS hose ends the best. Its constructed from thermoplastic rubber, has good chemical and abrasion resistance and long term flexible performance over a -40F to +275F temperature range. Pretty ideal for under-hood usage. Good length for a single car ~$130 shipped.
Alan
How about going back the S4/GT style intake tubes?
The URO copy of the OEM part is longer by about 2" and are intended to be trimmed to size (Part Number: URO-012423). I bet they would work for you. I remember I trimmed off about 1" to get them to fit onto the OEM shroud.
I prefer the S4/GT to the GTS version, they are lighter, more durable, and have far less material to absorb and retain engine heat, unlike the thicker options. Plus they are much more affordable at $100 each. The GTS version was nearly to reduce noice
As a follow-up to this - I now find myself in need of new intake tubes...
All things considered, really glad I tried siscogts and warf's idea on using speaker foam on CEET tubing. First picture below is from 2014 when I first did it. The second picture is from a car show earlier this year. As you can see, they look as good as new. For a GTS, I can't think of a better looking tube--it looks "semi" original, but doesn't quickly turn to crap.
How about going back the S4/GT style intake tubes?
Ahh - An option I suppose - but those are not not for me - and I also didn't like the GTS foam look even when new. I know the yellow stripe would not be to taste for many - Link>: These are of course also available in Black/Black too for a more stock look - however that is a 25' minimum - sufficient for multiple cars (~4-5?) - still comparable total cost to the S4/GT pair (and you could sell the excess to others recoup).
I replaced the insulated air ducts, wasn't cheap, but at least install was a pleasure ...
I wonder how will the new ones survive the next 30 years or so. This is for sure a different vendor doing them for Porsche now.
I don't know if its too late by now - but save those old GTS hose ends - they stand up rather well and are great finish to any alternative hose - helps to snugly match the hose end to the airbox & horns & avoids the need for a perfect hose ID match.
06-06-2024 | 03:21 PM
