Hi ! When I got an issue with my 612, I often find the answer on this forum. So thanks for that! But this time, I did'nt find how to fix the problem. So: I have a 612 F1 (march 2006) and I installed 21'' Forgiato wheels on it. Since that, sometimes, at low speed, I have a lack of power during 1 sec and the display shows "CTS intervention". Then it diseaper. I saw that the original 19" rear tires are 2cm bigger than the new one ... Does anyone have an idea ? Thanks you in advance ! Nic
CTS is your traction control goin off. It means you may not be getting as much bite out of your tires when you give it a bit of push. Check your tire pressures. I had a small issue with mine, and it turned out my pressures were very off. It still kicks in from time to time...but the 612 is slightly light from there rear and easily breaks traction.....at least on the roads I drive on which are not the greatest of quality asphalt. MJ
Nicolas- The ABS system, which runs the traction control system, does not care about the diameter of the wheels and tires you mount, it only cares that you keep the same differential in diameters between the front and rear tires, within ~5% of OEM differential. Your new tires are green, and the CTS light just tells you traction control is limiting torque to the rear wheels to prevent wheelspin. Since your 612 has a digital throttle, you feel nothing through the throttle pedal, unlike earlier systems where you could feel the throttle pedal kick as it rolled back. Once your tires wear in a bit, they should have better grip. If not, you probably need better tires, like the OEM Pirellis. Michelins, or Bridgestones. Your car has 588 Nm of torque, and that is almost as much as a 7 liter Corvette, so needs good tires. Taz Terry Phillips
I have a pea-stone driveway, and this behavior is standard when trying to get out onto the road! Interestingly in the winter (with snows) its not a problem, but now that the ground is unfrozen again, its hard to get out of the driveway
Thanks for your replies ! The thing is that the CTS runs even when I keep the same speed (without giving "a bit of push") Before I bought new wheels, my dealer told me about CTS and ABS issue even if I bought 20'' OEM Ferrari challenge wheels. I mounted Continental SportContact 3 cause I heard there were more confortable than the pirelli. But Tire pressure was 2,8. That seems to be to high in comparison with the 2,3 I had in my OEM pirelli tires. I will lower the tire pression and try again ! An interesting thing I noticed is that I put new TPMS captors on the wheel and after 10km, the system automaticaly detected them and monitors pressure on the display ! If I found how to post a picture, I will upload some pic of my 612 with the new wheels...
Nicolas- Tell me what size tires you have front and rear, and I will calculate the front rear differential vs OEM and see if that is causing your problem. Simply changing wheel size will not cause a problem. Taz Terry Phillips
Hi Taz, Here is the spec: CONTINENTAL SPORT CONTACT 3 > 255/30/21 : Wheel 9x21 > 295/25/21 : Wheel 10,5 x21 I decresed the tires pressure and the CTS seems to do a beter job. But still not perfect. Thanks for helping me ! Nic
Nic- OEM tires 245/45 18 F, 285/40 19 (245x0.45x2)/25.4=8.68"+18"=26.68" (285x0.40x2)/25.4=8.98"+19"=27.98" Differential 27.98-26.68=1.30"/26.68"=+4.87% (255x0.30x2)/25.4=6.02"+21"=27.02" (295x.025x2)/25.4=5.81"+21"=26.81" Differential 26.81-27.02=-0.21"/26.81"=-0.78% Differential from stock is 4.87%+0.78%=5.65% The max differential from stock is ~4-5% for the ABS to work properly, and you are way over that. Either you need smaller front tires or larger rear tires or your ABS will be screwed up and that is why you are getting the CTS lamp. You sure you have 255/30 21s? TireRack shows only a 265/30 21, which is even worse. Not much choice in those tires since they only have 2 sizes. You are screwed right now, you either need a 20" front wheel and new smaller tires there or change your tires to the only ones I saw that will work, Pirelli PZeros size 245/40 21 and 295/35 21, 28.6" and 29.1" in diameter. That will make your differential 1.75% and the difference from stock 4.87%-1.75%=3.13%, within limits for the ABS. Taz Terry Phillips
Hi Taz ! Well, seems that the ferrari dealer was right and the Forgiato dealor not ! Humm, so If I change the tires for the pirelli, I could be better according to you. This afternoon, I drove about 50km without any CTS message. I don't know if it 's because I lowered the tire pressure. Well, I will speak with the forgiato dealer about the differencial difference between oem and custom setup ! I thank you very much for your explanation ! Best regards, Nic By the way, how can I add a picture of my car on the forum ?
Nic- The wheels had nothing to do with the problem, it was strictly a tire size issue, but the dealer should have tried to match the tire diameters as closely to OEM as possible. It is their screw-up and not yours. Five minutes of research would have pulled up the OEM tire diameters. Unfortunately there are limited 21" sizes avaliable. My wife's car has equal sized 10Jx21" wheels all around (GL 550) and there are only two tires, Conti and Pirelli, that fit. To post a photo, look below the text box and hit Manage Attachments, Browse through your drives until you find the photo you want, select one, and then upload it to the thread. You can select 4 photos before having to hit Upload. Taz Terry Phillips
Hi Taz! THanks for your help ! Here is the pic of my car : Your opinion: should I keep the black Forgiato center wheel clap ou put the original yellow Ferrari caps ??? Image Unavailable, Please Login Image Unavailable, Please Login
Nic- That is a whole lot of black. The yellow caps would provide a bit of color relief and contrast. You can always remove them if you do not like them. An alternative is the silver ones made for several Ferraris, like these for the 456M. But they are about 4 times as expensive as the yellow centers. Taz Terry Phillips Image Unavailable, Please Login
Hi ! Well, thanks for your advices ! I going to try with the yellow caps ! champagne612, Nice looking 612 too with the challenge wheels !!! I noticed that you change your rear headlamp. I have one orange/red and one white/red but you have both white/red ! How did you do that ???
Nic- US/Cdn tail-lights have different color lenses than Euro tail-lights. Either set will work on your car, but US lenses may be against local laws. http://www.ricambiamerica.com/parts_catalogs.php?M=FE&P=&V=diag&I=1258 Taz Terry Phillips
Thanks ... I have some extra titanium center caps that cost me 250.00. A spare set of yellow - all center caps are not created equal
Taz, This is a crazy website !!! I can find everything from any Ferrari ! I dreamed about a website like this since years Thanks By the way, I drove with my 612 during all the week-end and had no CTS intervention at all since I decreased tire pressure and used a thin layer of the new tires... Hope the CTS story is behind me .... and when I'll have to change the tire, I will buy the pirelli you mentioned!
Nic- I would recommend you make a couple of max performance stops with ABS engaging to confirm the ABS is working properly. If it is, you should be ok. Do not need to be made from high speed. Taz Terry Phillips
