F430 rear diffuser and undercarriage repair | FerrariChat

F430 rear diffuser and undercarriage repair

Discussion in '360/430' started by V8Fun, Apr 8, 2011.

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  1. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    I was at the track over the weekend and was black flagged (meatball actually) when a corner worker noticed something hanging down under the rear of my F430. Turns out the front of the rear diffuser has somehow come loose and is hanging down just an inch or two. When driving at speed, I assume is working as an air scoop and probably pulls down further.

    I have not lifted the car yet, but from just poking my head underneath it looks like the bolt that connects it to the under-tray of the car is missing on one side, and on the other side the under-tray seems to have the spot here this bolt attaches ripped off (it is still connected to the rear diffuser there).

    My question is this. Are there any good sources for these body panels besides the dealer (not lookig for CF upgrades, just OEM parts). How difficult is it to replace these pieces, is it as simple as turning a few screws? Should I suck it up and just take the car to the dealer, or try a DIY repair? I'm somewhat of a novice when it comes to car repair, but i do know enough to safely lift the car using the proper lift points.

    Any advice is appreciated.
     
  2. steelej

    steelej Formula Junior

    Jan 15, 2007
    433
    UK
    3 bolts and 5 allen screws are all that hold the diffuser on, it's an easy job to remove, but if the bolts are all tight I can't see how it can be hanging down, get it lifted on a jack and take a quick look, remember it's just simply bolts holding on bits of plastic, should be very easy to replace.

    John.
     
  3. SfefVan

    SfefVan Guest

    Nov 28, 2008
    1,370
    Switzerland
    Full Name:
    Stef
    Sorry to hear you got this issue while tracking. Maybe your shop forgot to put back all the screws...have seen that already on my car...

    It should be easy to fix. Have a look to post #7 and #8 of http://www.ferrarichat.com/forum/showthread.php?t=310472 where I explained a bit how to remove the rear extractor. The center bold is identical to the other 4 bolds so you can use one of them as an example to get your new bold. It's really a DIY job.

    Good luck and give a shout here if you have any doubts or questions ;)
     
  4. Robdownunder

    Robdownunder Formula Junior

    Feb 6, 2009
    580
    Australia
    Full Name:
    Rob
    I had that happen after having it in for a Ferrari annual service....bad!
    2 bolts had dropped out and fortunately I have enough sense to regularly check things as much as I can.

    Fixed the problem with better quality bolts and spring washers but I still check.
     
  5. ELP_JC

    ELP_JC Formula 3

    Dec 13, 2008
    1,264
    Would you mind sharing the details (what, where, how much) of what you bought instead? There're several rounded hex bolts I need to replace everywhere dealer touched the car, and would like something sturdier, which will undoubtedly be cheaper than Ferrari bolts :). Thanks man.
     
  6. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    I got under the car and removed the diffuser. Thanks for the encouragement, it was easy. What I found was that 4 of the 5 bolts that hold the front of the diffuser were MIA. The fifth was still on the diffuser but ripped off the plastic under-tray of the car where they connect. I was able to take the bolt and washers (M6 size) to an Ace Hardware and got several to replace the missing ones. I even found one missing from the under-tray further forward!

    I now have fastened it as securely as I can, but the diffuser had been pulled all the way to the pavement by the wind-force and was damaged. The middle hole is half gone! There is also some paint damage where the diffuser bolts to the bumper because of the excessive flexing it was forced to encounter.

    Anyone know somebody who put a carbon fiber diffuser on their F430 that may want to sell me their original one? :)

    Thanks again!
    Mike
     
  7. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    #7 V8Fun, Apr 8, 2011
    Last edited by a moderator: Sep 7, 2017
  8. Doctor7474

    Doctor7474 Formula Junior

    Jun 20, 2010
    367
    Hoover Al,former Atl
    Full Name:
    Doctor
    Is it plastic?

    If so 3M is your friend, I've seen body shops put ripped bumper covers back together. This stuff is easy to use, can build tabs back, sandable and paintable.

    I'd use it to build that tab back up then sand down and repaint it. It should look good as new. Note the stuff goes through a chemical reaction and gets hot enough to the touch to burn your finger.

    http://3mcollision.com/3m-automix-ez-sand-flexible-parts-repair-kit-05895.html

    Basically you get some plastic material like garbage bag like material the heavy duty kind.

    Mix the epoxy, put it on the end and use the plastic to put on either side

    Let it set, sand and drill a new hole, then repaint.
     
  9. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    That is an interesting, and unexpected suggestion. This stuff is listed as a flexible parts repair kit.... but the diffuser is not flexible like the bumper cover. It is much harder. Also, given the missing tab/loop needs to be strong enough to hold it in place, I would be concerned about it coming off again.

    If I was hesitant to even take off the diffuser myself, or replace it, do you really think I could undertake this type of repair and have it turn out OK? While I was looking for a DIY solution, and I appreciate the reply, I must admit I'm a bit skeptical of this approach.
     
  10. Doctor7474

    Doctor7474 Formula Junior

    Jun 20, 2010
    367
    Hoover Al,former Atl
    Full Name:
    Doctor
    #10 Doctor7474, Apr 8, 2011
    Last edited: Apr 8, 2011
    The stuff is strong, it's stronger than thermoset plastic that most bumper covers/auto plastic bits are made of. I was at Spies Hecker (huge paint supplier part of Dupont) last year and we 'welded' bumpers back together than took vise grips and tried to rip it apart and the plastic tore before the epoxy. It's pretty easy to use and if you mess up well you can cut it off or sand it off and try again it's like making something out of clay but you got about 10 minutes to get it done, you could probably reinforce it with some thin metal washers around where the hole it. Once you get it right just sand down the rest of the diffuser with say 1000 grit sand paper then repaint it. Should be easy peasy, well at least better than paying out the you know what for a new diffuser.

    Thats how a body shop would repair it. What do you got to loose? You either try to repair it or get a new one. I'd take my chances with the epoxy and see how it turns out then if it doesn't work well you are back where you started, if it does work well you fixed your own car and saved some cash which I love working on my own cars.
     
  11. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    You do have a point there, I guess there is not much to lose if the alternative is the same as my current "Plan A", and the cost to try is minimal. I guess I could try the same on the under-tray where the hole was ripped off. I would hate to replace that whole thing just for one mounting hole being damaged if it could be easily fixed.

    I like the idea of imbedding a washer into the resin where the hole should be, for extra strength.

    Anyone else have any thoughts on this approach?
     
  12. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    Been reading more and it looks like the OEM diffuser is FRP (Fiberglass Reinforced Plastic). The 3M Flexible Parts Repair kit says it is not for use on "SMC/fiberglass". I think that just killed this as a possible solution.
     
  13. Doctor7474

    Doctor7474 Formula Junior

    Jun 20, 2010
    367
    Hoover Al,former Atl
    Full Name:
    Doctor
    Well if it's fiberglass then repair it with fiberglass and imbed some washers around the holes. :)
     
  14. 123jf

    123jf Guest

    Feb 26, 2011
    4
    Hi guys,
    Drove down to Monaco last week to the grand prix which I have to say was a great experience.

    Anyway as we were driving over the alps through Grenoble I hit a small rock in the road that continued under the body of my car that made a horrendous noise as it passed under. Upon my return to the Uk I had it to a friends garage and we had it up on the ramp to my horror the rock pushed the floor pan (drivers side) up leaving a gaping hole. Plus the front plastic shield is damaged which is not a problem as I will replace that.

    I havnt used my f430 since as I do know it has to be repaired. Any advise guys would be greatly appreciated.
     
  15. V8Fun

    V8Fun Karting

    Aug 16, 2010
    135
    Chicago West Suburbs
    Full Name:
    Mike
    I ended up using a local body shop to repair the diffuser. The rear bumper had also cracked/ripped from the stress when the diffuser was pulling down in the wind. Both parts look as good as new and the repair was not too expensive (far less than buying new parts). I did shop around and got a large variation in price, so don't go with your first estimate.

    The underbody parts are not fiberglass and can't be repaired or rebuilt. Also, you will want to check under them to see if there was any damage beyond just the underbody.

    Good luck, I know the feeling when the car is damaged. Hope you get it taken care of and back on the road soon!
     
  16. 123jf

    123jf Guest

    Feb 26, 2011
    4
    There is no other damage apart from a approximate 10cm x 5mm gape in the aluminum floor pan where the rock hit the under carriage. Not sure if it's wise to have it welded or a rubber based silicon to fill the gap up.
     
  17. Exotica Motorsports

    Nov 1, 2003
    3,673
    Washington
    Full Name:
    Jason Godsil
    I have an OEM diffuser here for sale. PM for pricing.
     
  18. SfefVan

    SfefVan Guest

    Nov 28, 2008
    1,370
    Switzerland
    Full Name:
    Stef
    #18 SfefVan, Jun 14, 2011
    Last edited by a moderator: Sep 7, 2017
    While I was at the factory of Capristo in Germany, I discovered that they are also making CF extractors for the F430. Here's photo of one of them. It's very nicely done in state of art using premium components.
    Image Unavailable, Please Login
     
  19. big_luke

    big_luke Karting

    Aug 28, 2010
    151
    I had a similar problem a few months back. I bottomed out a few times and when I looked, the under-tray didn't look well.
    so I un-bolted it and it was about $500 at Ricambi.

    so I took it down to a local boat shop that does fiberglass.

    it was $100 bucks to repair some glass and a coating of epoxy that made it look almost brand new.

    http://ferrarichat.com/forum/showthread.php?t=321292
     
  20. R99MUS

    R99MUS Rookie

    Sep 26, 2019
    8
    Full Name:
    Reece Musson

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