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Lowering a 456GT

Discussion in 'Technical Q&A' started by Bmyth-FDC, Jul 12, 2004.

  1. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
    2,742
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    Byron
    After I put on my new 19" wheels, I noticed that there was still a considerable wheel-well "gap" on my car. Hence, I thought about lowering it a bit.

    Has anyone had any experience lowering a 456GT?

    Do these cars have coil-overs? If so, is it easy to adjust?

    Thanks!
    Byron
     
  2. rexrcr

    rexrcr Formula 3

    Nov 27, 2002
    1,572
    Kalamazoo, MI
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    Rob Schermerhorn
    Lowering Ferrari 348, F355, 550

    Just pop your wheels off and take a look for the threaded spring perch yourself. May be hidden by grime, wipe with a rag under the lower spring perch.

    Rob
     
  3. fatbillybob

    fatbillybob F1 World Champ
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    Aug 10, 2002
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    B,

    I got the tools to do the job. You need to find the 456 motion ratio in the WSM and the rest is easy but I'm doing my major now so it will have to be the week of 7/18...


    Will fix Ferraris for giggles...
     
  4. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
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    Yo C,
    Week of the 18th sounds fine to me... can we do this after work one day? How long do you reckon a job like this will take?

    Btw, thanks for the tip and link, Rob!

    B.
     
  5. fatbillybob

    fatbillybob F1 World Champ
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    Aug 10, 2002
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    Maybe 30 minutes/corner but you have to get the front and rear motion ratio from the WSM before we touch anything otherwise you mess up the chassis rake.
     
  6. F456 V12

    F456 V12 F1 Rookie
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    Byron:

    Take notes, when I get my 19" set for my 456, I will want to do the same. Make sure to take before and after pictures.

    Mark
     
  7. jimmy b

    jimmy b Formula Junior

    Dec 13, 2003
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    Yes please. Post here whatever you can (no pics no prob, but brain dump lessons learnt).
    Thanks
    J.
     
  8. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
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    Well guys,
    I did it... I spent the better part of yesterday lowering my 456GT with my friend... It was a decently "straighforward" process but NOT as easy as every says it is, for sure! I still have to make some final adjustments (might have to raise the back-end about 0.5"), but visually, it is definitely an improvement!!!... can't wait to see how it changes the handling characteristics in the twisties or on the track!

    I'll be sure to post some pictures and some detailed step by step instructions later... there's a handy trick for the rear-end that's well-documented in the shop manual, too!

    Byron
     
  9. ronsupercar

    ronsupercar Formula 3

    May 2, 2002
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    4RE-Ron
    Are you looking to put some 19" rims to go with the lowered stance..

    Please send pics asap...

    Ron
     
  10. parkerfe

    parkerfe F1 World Champ

    Sep 4, 2001
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    Franklin E. Parker
    It's a GT 2+2! A GT needs a higher sidewall for a smoother ride.Go back to the stock set-up and be happy. If you want a sports car, buy a 550.
     
  11. Smiles

    Smiles Moderator
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    Nov 20, 2003
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    Matt F
    I apologise in advance if this is daft, but what's a WSM?

    Thanks.

    --Matt
     
  12. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
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    Thanks for the suggestion - my last car was a 348 challenge and I fully enjoyed it as well... I know this is a GT car, but there's no crime in enjoying a more aggressive look and better handling characteristics! Have you ever driven a 456GT on a track? Don't knock it til you've tried it - it is phenomenally fun!

    B.
     
  13. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
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    Ron,
    I have 19" Kinesis Motorsport K19R wheels on it...
    Here are some pictures (pre-lowering and with all my player's run stickers on it)... the car doesn't have the stickers anymore...

    http://www.ferraridrivingclub.com/downloads/

    Byron
     
  14. Bmyth-FDC

    Bmyth-FDC F1 Rookie

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    WSM = Work Shop Manual
     
  15. jimpo1

    jimpo1 Two Time F1 World Champ
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    Jul 30, 2001
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    Where's the pics of the new 'lowered' ride????
     
  16. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
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    Jim - they are forthcoming... I'm finishing up the step-by-step instructions right now...I'll try to upload them along with the pictures later tonight.

    Byron
     
  17. Hubert

    Hubert F1 Rookie

    Jan 3, 2002
    2,642
    The Left Coast
    Newsflash! The 550 is a GT car too, smartypants.

    Byron: was shopping for new wheels, and saw (your) 456 on the site, and thought it could use a drop, to match the new wheels; looking forward to reading your DIY.
     
  18. winston

    winston Karting

    Nov 3, 2003
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    don
    How much of the under nose-body would you like to scrape off? Do not lower your 456.
    Winston
     
  19. Bmyth-FDC

    Bmyth-FDC F1 Rookie

    Oct 4, 2002
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    Hey guys,
    Here are the step by step instructions - it was too large to attach onto fchat, so I uploaded it here instead:
    http://www.ferraridrivingclub.com/downloads/Lowering a 456GT.doc

    It was a fun experience overall - thanks to fatbillybob for helping me out! :) The car is more responsive on turns now (but still needs an alignment)... plus, I'm absolutely thrilled about how it looks! I achieved a ~0.75" drop in the front and ~1.5" drop in the rear (I'll be adjusting the rear up by 0.5" before I go for an alignment).

    For those that may venture into trying this, please just use my steps as a reference and make certain you have all tools, manuals, and background knowledge to do this if you choose to try it on your own...

    Enjoy!
    Byron
     
  20. RyanZX6R

    RyanZX6R Formula Junior

    Nov 4, 2003
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    Byron, looks great. Especially with those wheels.
     
  21. rexrcr

    rexrcr Formula 3

    Nov 27, 2002
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    Did you reset toe-in and camber?

    You may like the gain in static camber for the track, but your tires tread life will not like the change in toe.

    Rob
     
  22. Bmyth-FDC

    Bmyth-FDC F1 Rookie

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    Rob, you have mail.
    Byron
     
  23. fatbillybob

    fatbillybob F1 World Champ
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    Aug 10, 2002
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    A couple foot notes to Byron's write up. 1) the motion ratios are not in the WSM for the 456. You really need to find these as it makes the whole job easier because you know exactly how many turns= how much you lower. 2) you can estimate the MR by doing some math and just figuring the MR from the first guess from the result of turning the spring collars relative to the initial chassis ride height. So since the shock is 1.5mm per turn if for example 10 turns drops you 15mm you know the MR is 1:1 (the ratio is always somehting else since you ove the ride height trough suspension arms. 3) You can do this wo/ the MR by knowing the factory ride heights and just making sure the lower heights are the same amount lowered front and rear "from factory" but it takes more trial and error=more time 4) this was my first exposure to Ferrari's hydralics. To do this the quickest way you should depressurize the system first so that the car is sitting on springs not part spring part pumped up shock. Then lower the car to where you want it. then reset the hydralics full ladened per the WSM. 5) IMO slip plates are mandatory so you don't have to drive the car around to settle the suspension.
     
  24. Hubert

    Hubert F1 Rookie

    Jan 3, 2002
    2,642
    The Left Coast
    billy bob: i always thought the motion ratio was used to determine the neccessary damper / shock valving for a given (desired) wheel rate and spring rate combination; as the motion ratio is the amount of damper movement divided by the wheel movement, and is calculated by removing the springs,wheels and anti-roll bars from the car, and measuring the distance b/w the suspension pick-up points at max and min droop v. the change in wheel movement between those settings.
    are you sure that you're not interchanging roll center for motion ratios?
    moreover, i 've never relied on the # of threads to determine how many inches i'm lowering the car. instead, i've always left that up to the scales and cornerweighting, as i've allowed the cornerweights, and cross-weights determine the ride height - since non-aero, fendered tubs like ours aren't all that sensetive or ride height dependant.
    sorry if i've read your comments incorrectly.
    hubert
     
  25. fatbillybob

    fatbillybob F1 World Champ
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    Aug 10, 2002
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