Ventilated front undertray | FerrariChat

Ventilated front undertray

Discussion in '308/328' started by magnum, Nov 28, 2009.

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  1. magnum

    magnum Formula Junior

    Feb 21, 2008
    877
    Barcelona, Spain
    Full Name:
    Antonio
    #1 magnum, Nov 28, 2009
    Last edited by a moderator: Sep 7, 2017
    As you know the 308 front radiator drives lots of heat to the cabin. I've seen in one thread an Fchatter that was manufacturing ventilated undertrays, so I decided to made one by myself. Very easy to do, the final result is that the heat coming out from the radiator escapes directly under the car by Venturi effect.
    The cabin now is confortably colder and the engine temperature has dropped a little bit more. So I recommend you this solution.


    You need a satin black aluminum sheet 260 mm x 600 mm x 2 mm, and a 200 mm x 400 mm aluminum standard ventilation grill -black would be better-. You must drill the holes copying them from the original undertray, plus cutting a 180 mm x 360 mm rectangular hole. After that, I've attached the grill to the sheet with rivets. Easy.
    See the image attached.

    I've tested the car and the change on the inside temperature is notorius.
    Image Unavailable, Please Login
     
  2. Steve King

    Steve King F1 Rookie

    Feb 15, 2001
    4,367
    NY
    Great idea. How much material did you remove from the flat panel. Did you cut slots or drill holes or did you just cut out a big square hole. Thanks for the tip.
     
  3. ramosel

    ramosel Formula 3

    Sep 11, 2004
    1,237
    Meadow Vista, CA
    Full Name:
    R Moseley
    Nice.
    I've got one of the louvered ones coming from Gerry at ForzaParts... mainly because the one on my car was just missing!! Good to hear first hand knowledge that the things are truly functional as well.

    Thanks,
    Rick
     
  4. magnum

    magnum Formula Junior

    Feb 21, 2008
    877
    Barcelona, Spain
    Full Name:
    Antonio
    Steve,
    For the ventilated area I've cutted a big square hole. No problem about rigidity, because the grill reinforces the sheet. It's OK that way.

    Cheers
     
  5. enjoythemusic

    enjoythemusic F1 World Champ

    Apr 20, 2002
    10,676
    Worldwide
    Full Name:
    Steven
    Oh well, you just reduced the best way to obtain downforce without the drag backlash but then again i assume the car is just for driving on public roads so no real harm done and you added comfort.
     
  6. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,150
    way north california
    Full Name:
    chris morse
    #6 chrismorse, Nov 28, 2009
    Last edited by a moderator: Sep 7, 2017
    Hi Ntonio,

    A great guy named "Gleggy", from Down Under has manufacturered louvered plates, sump baffels, skid plates and probably a bunch of other goodies. I believe Nick's Forza might be handling some of his stuff.

    At $65. for a group buy, i couldn't pass it up.

    Here is a photo.

    The aluminum louvered piece you have shown is very very fragile. I use them on water heater closet doors. It would be super easy to flatten out the luvers by hitting leaves on the road, well almost :)

    HTH,
    chris

    Here is a link to one of the threads containing info about Gleggy's stuff.

    http://www.ferrarichat.com/forum/showthread.php?t=171706&highlight=sump+baffle
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  7. magnum

    magnum Formula Junior

    Feb 21, 2008
    877
    Barcelona, Spain
    Full Name:
    Antonio
    Thanks for the info Chris.
    Interesting to know that this stuff is available -for this reason I made my own undertray-. I know my grill is very fragile, of course, because isn't intended for this kind of job. If you want to form a buy group for this item, I'm in. Let me know. Also the skid plate sounds interesting.

    Thanks
     
  8. magnum

    magnum Formula Junior

    Feb 21, 2008
    877
    Barcelona, Spain
    Full Name:
    Antonio
    That's it.
    I don't need the aerodinamic downforce at all. I'm driving the car only on open roads with 120 km/h limitation so... Being realistic a 26 years old Ferrari can't beat a simple Renault Megane Sport... To race, better with cheaper and powerful modern cars...

    Cheers
     
  9. AZDoug

    AZDoug Formula 3

    Jun 17, 2009
    1,606
    Along the Verde , AZ
    Full Name:
    Doug
    Yes, the tradeoff.

    You may be able to regain some of the lost aero efficiency by adding an airdam of some sort right at the front of the tires, but of course you lose more ground clearance.

    You may also be able to make it up by extending the belly pan as far back as possible before it starts to interfere with engine cooling, or maybe the belly pan is already as far back as possible before engine air is compromised, as teh frame seems to have some air scoops welding into it here and there.

    Doug
     
  10. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,150
    way north california
    Full Name:
    chris morse
    Hi Antonio,

    I am not suggesting we do the group buy, but rather that i was able to take advantage of one through Daniel Cookson in the above mentioned post. It is a nice piece.

    And as Steven mentiones, yes, you might just possibly loose 1.02 pounds of downforce at street legal speeds - but anything we cando to help keep the interior cool and lower engine temps is welcomed :)

    chris
     
  11. rizzo308

    rizzo308 F1 Rookie
    Silver Subscribed

    Sep 12, 2004
    2,781
    Perth, Australia
    Full Name:
    riggio
    #11 rizzo308, Nov 28, 2009
    Last edited by a moderator: Sep 7, 2017
    The grills are sorta ok it comes to getting rid of the of some of the excess heat from front every little bit helps ...i had the my grill installed for 4 yrs and there no way the the temp in the cab has been improved very little hot air is directing from under the wheel tub and out the grill but what about the top the tub it is that close the the rad the hot air hits it and is diverted to the sides of the tub then hits the fire wall next time you drive your car on a warm/hot day pop the front feel the wheel tub yes it's hot feel around the brake booster etc the booster will aslo be hot all the heat coming of the booster hitting it
    and then f/wall lift the carpet around the pedals see how hot it is ..............
    now remove the batt lid and feel the front face of the batt it is cold see there is a steel plate at the front which diverts hot air around the batt every thing around that area is hot
    except the batt to fix this problem i had to divert all the hot air coming off the rad
    out to the sides of the car towards the fender grills and around the underside..........this is my fix and works for me the cab is now way cooler its not pretty but everything is reversable it needs to be painted yet and a new piece fabbed to cover the batt with the engine running and the rad fans on you can feel the heat coming off the rad and out the fender grills
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  12. ace_pilot

    ace_pilot Formula Junior

    Sep 6, 2007
    921
    Long Island, NY
    Full Name:
    George
    Wow, that is some serious solution to this problem. I hope you got the functional part working cause the aesthetics are just insane!

    Ace
     
  13. rizzo308

    rizzo308 F1 Rookie
    Silver Subscribed

    Sep 12, 2004
    2,781
    Perth, Australia
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    riggio
    all works well ....took about a day to fab up nothing lost alot gained ..........cheers
     
  14. TURBOQV

    TURBOQV Formula Junior

    Mar 6, 2003
    838
    NV and Utah
    Do the louvers really work? My wife hates the heat that comes in. Sure would be nice to eliminate this. Are the louvers and skid plate still available?

    Thanks
     
  15. rizzo308

    rizzo308 F1 Rookie
    Silver Subscribed

    Sep 12, 2004
    2,781
    Perth, Australia
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    riggio
    My 2c worth no they don't not so you will notice the diff in the cab
     
  16. TURBOQV

    TURBOQV Formula Junior

    Mar 6, 2003
    838
    NV and Utah
    Thanks. I guess i wont bother than! the skidplate looks like a good idea though.

    Cheers
     
  17. ramosel

    ramosel Formula 3

    Sep 11, 2004
    1,237
    Meadow Vista, CA
    Full Name:
    R Moseley
    I got the skid plate from someone who never installed theirs, but I have been in contact with Gerry (new email - [email protected]) and I have one of the louver plates and the extra sump baffle coming as we speak (errr, type) - so yes they are still available.

    Does it work? I think this is like anything we discuss here... folks are going to argue both ways. My feeling is if you give the hot air some place to dump, it will. I haven't tried it yet, I can only go by what Magnum (and others have) experienced... he seems to think it perceivable difference. I never really felt much heat in the car when mine was on the road (oh so many years ago now). But my car was missing that plate all together!! I was concerned how putting a plate back on there was going to affect engine cooling and passenger comfort. I felt Gerry's plate to be a worthwhile compromise. Looks like Magnum has a nice home-grown adaptation as well.

    But yeah, I can also see where dumping a bit of hot air into that air stream under the car will probably have some impact on downforce... I wouldn't do it on our race cars... but my 308 isn't a race car. And... I'm going back together with a deep Euro nose so I think I've compensated for whatever loss I may induce with a vented lower panel.

    my $.02 worth,
    Rick
     
  18. Nurburgringer

    Nurburgringer F1 World Champ

    Jan 3, 2009
    11,187
    Texass
    I drove my 308QV for about 2500 miles this summer with no panel at all and there was still quite a bit of heat 'bleading' into the footwell area. For some of this both fiberglass liners were in place, for some only the front piece, and for some neither.
    Most if not all of the hot air seemed to be comiing in through the large center dash vent hose. Stuffing insulation around the hose seemed to help a bit.
    Luckily we had a cooler than normal summer here, but until I worked on a bit my feet were still frying.
     
  19. LarryS

    LarryS Formula Junior

    Nov 14, 2003
    302
    Fremont, CA
    Full Name:
    Larry S
    On hot days I pull the front compartment release,
    it pops up about an inch, maybe relieves the positive
    pressure in there?, seems to help keep the heat out of the cab.
     
  20. greg328

    greg328 F1 Rookie

    Nov 17, 2003
    4,209
    Austin, TX USA
    Full Name:
    Greg
    Rizzo, I love your car, its mods, and your posts, but i sure wish you would use periods (.) in your posts, would be easier to read!

    :)

    Greg
     
  21. tatcat

    tatcat F1 World Champ
    Owner Silver Subscribed

    Sep 3, 2001
    11,013
    panama city beach FL
    Full Name:
    rick c
    i bought one in the group buy. it works great. reduced the heat intrusion by 40%. the wife even mentioned the improvement so it must be making a difference.
     
  22. miketuason

    miketuason F1 World Champ
    Owner Silver Subscribed

    Feb 24, 2006
    15,813
    Cerritos, CA.
    Full Name:
    Mike
    #22 miketuason, Nov 29, 2009
    Last edited by a moderator: Sep 7, 2017
    Got mine from danielcookson when we had the group buy along with the skid plate.
    It's anodized aluminum. Works great and noticeably reduced heat.
    Image Unavailable, Please Login
     
  23. Dino246gt

    Dino246gt Formula 3

    Mar 26, 2007
    1,038
    Winnipeg, Manitoba,
    Full Name:
    Dennis Ezmerlian
    Miketuason, is that piece for the rear, and is it still available? I'm kind of confused if you guys are talking about the front or rear pieces. Thanks, Dennis (Dino246gt)
     
  24. magnum

    magnum Formula Junior

    Feb 21, 2008
    877
    Barcelona, Spain
    Full Name:
    Antonio
    Thanks for the info Mike.
    But one question: aren't the louvers inverted? On my design the louvers are facing the rear, and on this plate the louvers are facing the front of the car. Maybe the picture is inverted? That way the air enters directly to the front compartment -no Venturi effect-, my way the air flow allows the heated air to escape -Venturi effect-.
    Maybe I'm wrong or maybe that louvered plate works different.
     
  25. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,150
    way north california
    Full Name:
    chris morse
    In the picture, you are lookning at the bottom surface. The louvers point to the back, as you would expect, otherwise it would be a scoop, picking up pieces of gravel off of speed bumps :)

    chris
     

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