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Scuderia wheel spacers

Discussion in '360/430' started by duncan1165, Jul 12, 2009.

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  1. duncan1165

    duncan1165 Rookie

    Jun 18, 2009
    25
    #1 duncan1165, Jul 12, 2009
    Last edited: Jul 12, 2009
    Just purchased wheel spacers and new titanium bolts(longer ones) for my new Scud. They are from Novitecrosso who have supplied 10mm for the front and 15mm for the rears and assured me these fit fine. Im going to increase the rear tyre size to a 305/30/19 Corsa for track work. Hence its looking like Im going to have to roll the rear guards. I have a very good man who is booked in to do this on Friday, has anyone had any issues with wheel spacers and or rolling the guards-i.e given the alloy body !
    H&R supply 15mm spacers front and rear so perhaps the 10mm might be better on the rear with the wider rear tyres ? Any issues with traction/stability computers with these changes ?
    Cheers Duncan
     
  2. Tarek K.

    Tarek K. F1 World Champ
    Rossa Subscribed

    Sep 7, 2006
    10,798
    Cairo - Egypt
    Full Name:
    Tarek K.
    #2 Tarek K., Jul 13, 2009
    Why would you want to do that.............the Scuderia has absolutely no issues on the track with it's stock tires.
     
  3. F430GT

    F430GT Formula 3

    Sep 29, 2005
    1,300
    Marco Island, FL
    #3 F430GT, Jul 13, 2009
    Actually it does, it rides on the bump stops way too much.

    I'm running a 345 tire, no spacers, no rolled fenders. No need to roll fenders.
     
  4. strad

    strad Karting

    Jul 31, 2006
    147
    Kent
    Full Name:
    joe
    #4 strad, Jul 14, 2009
    Rad is that on the Stock Scud rim?


    Joe
     
  5. F430GT

    F430GT Formula 3

    Sep 29, 2005
    1,300
    Marco Island, FL
    #5 F430GT, Jul 14, 2009
    The 295/345 are on HRE Comp wheels.

    There is plenty of space in the wheel well of a 360 and 430. I measured the available space, and the car can use the widest available tire (345) on a wheel up to 13.5", without making changes to the rear body work. A 14" wheel fits with minor trimming on the rear undertray, but no changes to the bodywork.
     
  6. F430GT

    F430GT Formula 3

    Sep 29, 2005
    1,300
    Marco Island, FL
    #6 F430GT, Jul 14, 2009
    Duncan,

    CT, e-diff, CST, ABS will work fine as long as you don't go crazy with the tire diameters, I mean too far away from the stock diameter ratios front/rear.

    You should use the 15mm spacer front and 10mm rear. The culprit of the Scuderia (and the Modena, Stradale, 360/430 Challenge) is understeer. More tire in the back is going to make it worse. If you want to stick with the Corsa, stay with the 285, and switch the front to a 245 Direzionale. It will work better at the track, and it will still understeer.
     
  7. duncan1165

    duncan1165 Rookie

    Jun 18, 2009
    25
    #7 duncan1165, Jul 15, 2009
    F430GT,
    Its good to see someone who knows a bit about motorsport, your about the only response worth reading (to date), Im sure there will be others)
    There seems to be some confusion by others over the Corsa tyres. The tyre supplied from new are the Corsa system tyres which are basically a good steet tyre(or tire as you guys spell it). The full Corsa tyre is a track tyre and is pretty well other than perhaps the Hoosier( hopeless in the wet) the track tyre of choice.
    I've got the 305 on the back and kept the 235 on the front, but as you say might be best to go the 245.
    Im going to have to roll the rear guard for sure and the guys down here are saying its standard practice and pretty well a requirement on the 430 and even more so on the 360 with any wider rubber.
    Thanks for the call on the CST etc.
    After 13 911's( including 73RS,993GT2,996GT2 and 997Supercup) you get used to understeer -slow in fast out. But having said that, the Scud should hold much better mid corner speeds.
    I've got my first Porsche Club track day on July 25th and Im just hopeing like all hell I dont get smacked by a standard GT3.
    That would suck ! So just trying to get the car as sorted as best I can to fly the SF flag!
    Have you had issues with the front getting light through fast turns. Another Scud owner down here complained of his lifting at high speed in a kick on a main straight at our local track ? He has gone the full GT front, which makes the car unsteetable
    Cheers Duncan
     
  8. F430GT

    F430GT Formula 3

    Sep 29, 2005
    1,300
    Marco Island, FL
    #8 F430GT, Jul 15, 2009
    The non-system Corsa are pretty good tires, as good as the Toyo R888 and Michelin Pilot Sport Cups. The Corsa System not so much.

    I haven't been to a high speed track yet (100+ mph). However, SportAuto tested the car at 100 km/h (62 mph) and there were 9 lbs of front lift, no lift at the back. Aero downforce (or lift) grows exponentially with speed, because the velocity is used as v^2 in the formula. If everything else stays the same (air density, body shape, rear downforce), at 200 kp/h the Scuderia should be generating 36 lbs of lift at the front axle, and close to 150 lbs at the front axle at 300 kp/h. This is valid on straight line only at constant speed.

    The car comes with very soft springs, and a low wheel rate (0.7), so during acceleration at high speeds, the squat would increase front lift even more. In addition to the squat caused by the quick acceleration (the Scuderia is quick at most speeds), the front lift changes the rake as well, and this will definitely increase front lift even more as the speed increases, and most likely the rear end won't stay at zero downforce anymore.

    I think (not my experience) that with the numbers exposed here, there could be a slightly noticeable feeling of a light front end at high speeds, but these are really low numbers. I would just drop the car (I did already) 10mm at the rear, and 15mm at the front and start from there. Just lowering the car and changing the rake will drastically change the Aero numbers.

    The rear is extremely well planted, I can put more power down than with the heavier rear and less powerful 997 GT3 RS. I ran 4mm stiffer rear sway bars, and 1,500 lbs springs at the back, and the rear still grips so well. The front is the one giving me a hard time, corner entry understeer, steady understeer, corner exit excessive understeeer. Hopefully I'll get it dialed soon. The alignment numbers are getting extremely different than the stock numbers, and weird looking in fact, but it is what works.

    A F430GT front bumper (from the FIA GT2 program) would add too much downforce on the front, so you will need a rear wing to balance the car. I don't think the car needs new body parts to solve minor Aero problems, ride height and rake will fix it quickly. Obviously, extra downforce is nice, but there are too many factors to consider.
     

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