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458 engine cutoff at 100kph

Discussion in 'Technical Q&A' started by RTAB, May 25, 2020.

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  1. RTAB

    RTAB Rookie

    May 25, 2020
    7
    #1 RTAB, May 25, 2020
    Hello, this is my first post and apologies for posting a query already. I’m from the Philippines. I have a 458 Italia imported from Dubai. Whenever I’m in sport mode on the highway, whenever I slowly creep up speed and reach 100kph, there seems to be a cutoff on the engine and the asr/cst light flashes. But if I step on the throttle more aggressively, it will do this momentarily then go all the way past 120kph. It’s unnerving and weird. It’s like the engine will cough then immediately recover. Makes it extremely difficult to cruise at 100 to 120 kph which is the speed limit here. Anything below 100kph, no problem at all.
    This does not happen in race mode. Just wanted to find out if any of you guys have experienced this. Was thinking it’s preprogrammed into cars from the Middle East but it seems weird. I know the speed alarm is programmed into these cars, but not actually control the engine. Thanks in advance for any info!
     
    Aruna Seneviratne likes this.
  2. windsock

    windsock Formula 3
    Rossa Subscribed

    Nov 29, 2006
    1,153
    #2 windsock, May 25, 2020
    I suspect you have the wrong size tires on the car.
     
    Aruna Seneviratne, Rex71 and Rojo like this.
  3. greyboxer

    greyboxer F1 World Champ

    Dec 8, 2004
    12,667
    South East
    Full Name:
    Jimmie
    #3 greyboxer, May 25, 2020
    Isn;t there some weird speed limiter on Gulf cars - I recall an old thread covering this in the 458 section
     
  4. RTAB

    RTAB Rookie

    May 25, 2020
    7
    #4 RTAB, May 25, 2020
    Thanks for the replies. I have the original size tires on the stock wheels. weird thing is does not happen on race mode.

    If this is programmed on gulf cars, can the ECU be reprogrammed for another spec?

    thanks
     
  5. RTAB

    RTAB Rookie

    May 25, 2020
    7
    #5 RTAB, May 25, 2020
    @windsock. Sorry my mistake, you’re right after double checking it’s not the original tire sizes on the stock wheels. I just got the car and I assumed they were the stock sizes. After checking with the previous owner l, he put speciale size tires on the stock wheels. 245/35 20 front and 305/30 20 rear.
    Would that confuse the Stability system?
    Thanks in advance!
     
    Aruna Seneviratne likes this.
  6. windsock

    windsock Formula 3
    Rossa Subscribed

    Nov 29, 2006
    1,153
    #6 windsock, May 25, 2020
    In race mode the traction control is much less sensitive then in sport mode. I have seen this several times.
    Depending on the brand here is a rough rev per mile.
    Stock 788 front and 741 rear
    Your tires, some adjustments depending on brand but it gives you an ideal. I use Pirelli for the comparison.
    The sizes you provided 778 front and 765 rear you have decreased the front wheel speed but increased the rear wheel speed and the stability control interprets this as wheel spin and interacts. stock sizes or sizes that will be close to the same rotational ratio will resolve the issue.
     
    Akajak1 and Aruna Seneviratne like this.
  7. RTAB

    RTAB Rookie

    May 25, 2020
    7
    #7 RTAB, May 25, 2020
    @windsock
    Thanks so much for the info
    Will borrow the stock wheels and tires of a friends 458. Will let you know

    Thanks!
     
  8. martinperry

    martinperry Karting

    Jun 4, 2008
    127
    Sawbridgeworth, UK
    Full Name:
    Martin Perry
    #8 martinperry, May 26, 2020
    My Testarossa, originally a Gulf car, had a speed warning "bong" at IRC 120KMH - that was a simple unplug before exotic modern electronics!
     
  9. RTAB

    RTAB Rookie

    May 25, 2020
    7
    #9 RTAB, May 26, 2020
    @martinperry
    The sub selection to adjust the speed alarm doesn’t show up on my left tft menu. I’m thinking Must be specific to gulf cars. It’s fixed at 120kph.
    I don’t know if there is something that can be done about this.
     
  10. RTAB

    RTAB Rookie

    May 25, 2020
    7
    #10 RTAB, May 27, 2020
    @windsock.
    Change tires to 458 specs. Problem solved. Thanks so much for the help!
    Appreciate it.
     
    Aruna Seneviratne likes this.
  11. Aruna Seneviratne

    Aruna Seneviratne Rookie

    Aug 1, 2020
    1
    New York
    Full Name:
    AMS
    #11 Aruna Seneviratne, May 14, 2021
    Same issue with me. Put Speciale spec MSC2s on my Italia, and power cuts of at 62mph in sport mode. Not in Race Mode or CT off. Good to know this, as someone told me it could be the abs pump going bad - that would have been a costly unnecessary repair. Thanks @windsock. I will switch back to Italia spec tires next tire change
     
  12. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,312
    Sydney
    Full Name:
    Ian Riddell
    #12 Qavion, May 15, 2021
    On previous generation cars (F360/F430), the Gulf car bong seems to be activated (or deactivated?) by a ground wire on one of the instrument panel plugs. I wasn't able to identify a similar wire/pin in the 458 wiring diagrams. It's probably buried in acronyms and technobabble.
     

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