149095 Speed sensor for $180. Installed and working | FerrariChat
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149095 Speed sensor for $180. Installed and working

Discussion in '348/355' started by carwhisperer, Mar 16, 2016.

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  1. carwhisperer

    carwhisperer Formula Junior

    Sep 29, 2014
    426
    Sacramento, CA
    Full Name:
    Brian
    #1 carwhisperer, Mar 16, 2016
    My 355 speedo wasn't working. I checked the circuit and reached the conclusion that the fault was in the sender. I checked prices and the best I could do stateside was about $280 shipped. I found that Scuderia in the UK had one for 119 pounds. I ordered it and after shipping I paid about $180 US. I installed it and the speedo is working. BTW, I haven't calibrated it yet but it appears to be wildly optimistic. My car could probably actually reach the claimed top speed of 183 according to this speedo. Obviously none of that is Scuderia's fault. I had a pleasant experience with them and I just thought I'd pass that along!

    Brian
     
  2. hjp

    hjp Formula Junior

    Feb 23, 2013
    591
    Kansas City, Mo.
    Full Name:
    Jerry Peterson
    #2 hjp, Mar 16, 2016
    Brian.

    My speedo was bouncing around below about 40 mph above which it would read normally. This went on for a few months and I assumed it was the sending unit so I put a new one in from Eurospares. Now it doesn't register at all (except for one brief moment for a few seconds when it bounced a time or two and then went back to doing nothing....I was going below 40 again at the time).

    I am going to dbl. check the connection at the speedo itself in the next couple of days since I'm going to have the cowl out to change some light bulbs but I don't think anything is really wrong there since I had it out not long ago and used a high quality electronic contact enhancer on the plug terminals when I put it back (and the plug only goes on one way). I also bought a used plug for the sending unit connection in case it might be faulty but it hasn't arrived yet.

    Exactly how did you check your circuit? Any ideas what else could be wrong with mine? Do you think the speedo itself could be the problem (I recently found a guy in St Louis, MO that can confirm operation/repair if I need to go that way)? By the way, how do you calibrate it if its off because of the new sender. Is this typical when you replace the sender (it was spot on before this started)?.

    Needless to say, this is frustrating since I thought the new sending unit was going to take care of my problem.
     
  3. carwhisperer

    carwhisperer Formula Junior

    Sep 29, 2014
    426
    Sacramento, CA
    Full Name:
    Brian
    #3 carwhisperer, Mar 16, 2016
    Sorry to hear about your trouble. I am a cheap skate and try not to buy parts hoping it will fix things. With my 348 almost every problem seemed to be due to a corroded connector. This car has less of those problems, I think mostly because it never lived in a state like Florida. Anyway, what I did was run power to the hot side of the wire that goes to the sender, since I couldn't find any there. When I did this it powered up the entire circuit, turning on the stereo and some other stuff, can't remember what exactly. So I concluded the hot side of the circuit was intact. The other side goes more or less straight to the speedo. I think I tried quickly sending it 12v, hoping to see the speedo jump a little. I didn't, but wasn't too sure of the validity of the test. At any rate, I was pretty sure that half of the circuit was good.

    I think a better way to test that circuit would be to ground it at the sensor end and see if you can detect ground at the speedo end with a DVM.

    Also, I took apart my sender and found that the internal circuit was pretty much toast so I knew I needed a new one either way. Also, I put some silicone on top of the new sender in hopes of preventing water penetration since I think that is one of the main problems of sender failure.



    As far as checking for calibration, I plan to take the car down a stretch of highway with mile markers and run my stopwatch, and calculate the actual speed. I don't plan to actually calibrate it, other than try some slightly larger diameter tires.

    Brian
     
  4. hjp

    hjp Formula Junior

    Feb 23, 2013
    591
    Kansas City, Mo.
    Full Name:
    Jerry Peterson
    #4 hjp, Mar 17, 2016
    Thanks Brian, I'll try what you suggest. When yours wasn't working, what did it do or not do?
     
  5. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,487
    Sydney
    Full Name:
    Ian Riddell
    #5 Qavion, Mar 17, 2016
    You could probably even get an App for a smartphone with GPS speed. It's probably safer if your friend monitors the phone while you're driving.... although some have a Head-Up Display (HUD) which shines on your windscreen, with your smartphone on the dashboard. Even the free apps seem to get 5 star ratings.
     
  6. carwhisperer

    carwhisperer Formula Junior

    Sep 29, 2014
    426
    Sacramento, CA
    Full Name:
    Brian
    #6 carwhisperer, Mar 17, 2016
    My speedo was completely dead. So what it didn't do was work :)
     
  7. John_K_348

    John_K_348 F1 Rookie

    Sep 20, 2013
    2,757
    Boston, MA
    Full Name:
    John E. Kenney
    #7 John_K_348, Mar 17, 2016
    Cool. Just had mine done. When I worked out the shipping, exchange rate and my upcoming trip to Brazil, it made more sense just to go with Ferrari (not Maserati version either) and get the two year warranty. It's working fine and I made a heat jacket for it. A couple strips of header tape cut to form a square. Then covered one side with fire proof foil tape. Made some mounting straps out of the same tape and molded it around the sensor and connected the straps over the sensor cable facing the header. It worked pretty well. May add silicon to keep the water out. I heard heat was worse. The tape is heavy and malleable so it forms into place too. Open on the trans side for ventilation.
     

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