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| D2 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc. |
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#1
8th January 2020, 03:20 PM
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Galvanising front and rear subframes
My recently purchased 2.8QS needs a complete front & back control arm and shock absorber set and seeing as both subframes are quite rusty on this almost 20 year old car I was also thinking of getting them sand blasted and galvanised.
Have any of you done this? I don't want do do powder coating as its not as permanent and protective as galvanising. Any opinions? 
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#2
8th January 2020, 03:37 PM
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Interesting idea. The only challenge I see with it is that the bushes are pretty much unobtanium now, and you'd need those out to hot dip it otherwise they would just burn up. IIRC I bought the last full set of S8 bushes with the last subframe I stripped, but the 2.8 bushes may still be around somewhere. If you can find them and are willing to spend the cash then go for it.
Generally I just blast and re-paint with something like Rust-oleum combicolor when the bushes are intact. I agree powder coat is definitely not tough enough for a job like this - it tends to flake off the sharp edges and welds quite easily.
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#3
8th January 2020, 03:57 PM
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I looked into galvanising when I had my subframes replaced a while ago but decided to go with a coating of POR-15 instead.
__________________
Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------  ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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#4
8th January 2020, 04:29 PM
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I really like the idea of galvanising the subframes. I managed to get hold of a pair of very good condition front and rear subframes last year. Both have very little corrosion and are ideal for galvanising.
I managed to get hold of a full set of bushes actually quite easily. The fronts (8 of them) from Audi main dealer and the rears (4 needed but 2 different part numbers) from ECS Tuning in the US. Except to pay good money for them though. I think mine were around £700 for them all. Removing the old bushes is also a challenge. Especially the front ones as they cannot simply be pushed through. I managed to get hold of the genuine Audi tools for removing the bushes but I still had to do some improvising. When I get done with my rear suspension refurb in the spring I'll start to look at getting the frames galvanised or some other suitable coating. I want something that involves "dipping" as the frames are hollow and painting the inside would be difficult.
__________________
Audi S8 D2 2002 88k mls Ebony pearl effect black. Grey interior.
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#5
8th January 2020, 05:29 PM
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Quote:
 I know when I asked recently there were three left. Fat lot of use that is!
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#6
8th January 2020, 07:33 PM
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According to my info the pn for the bush is 4D0399415K and its shared between phaeton and found lots of them on ebay?
My plan was to buy the 2 subframes from forum sponsors then get them galvanised and then give it to my mechanic, this would avoid the car being in bits for probably weeks.
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