Limited power but no warnings?

Discussion in 'Issues, Warranty, Recalls, TSB' started by wtf, Mar 26, 2020.

  1. wtf

    wtf Well-Known Member

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    Hi guys,

    My A90 supra is totally stock, and I have been surprised that few people seem to have mentioned any kind of power limiting on their car especially for those who have upgraded turbos, downpipes, tunes and so forth.

    I came across this issue first on the circuit, after 2 laps, it seemed the car went into a limited power almost limp mode at high speed, basically on the straights at top of 4th.

    Essentially it felt like I was only pressing 50% throttle which was frustrating as it was happening just before crossing the start/finish line and killing my lap times.

    There are no warnings, no CEL, nothing obvious that would suggest there was a problem.

    If I bring up the "sports displays" I noticed the power was maxing out at around 145kw instead of the usual 245kw on the screen.

    If I backed off for 10 seconds the car went back to normal, which made me think maybe it was intake temp related.

    Ideally I would have liked to be logging oil and intake temps via obd but I was already busy with getting myself sorted for the track sessions that I didn't have time to do debugging.

    I later turned the air con off and for the rest of the day, I didn't experience a power limit.

    Now here's were it's strange, last night in cool night air, on the highway I experienced the same issue for the first time *on the street*, after overtaking a few cars to get into the off ramp.. same symptoms, limited power, no warning, but power displays only going up half way.

    Being that it was a chilly night I didn't expect anything of the sort.

    I know another Australian supra had the same issue at roll racing, but I am wondering if anyone else has narrowed down the issue and has an answer/solution?

    I mean Australia is typically warmer than rest of world, but it seems pretty stupid I get no warning or CEL to indicate there's an issue..

    Any help or experience welcomed :)

    Mark


    82442535_10218932082190991_2528645395471400960_o.jpg IMG_20200325_014121_412.jpg
     
  2. a90moe

    a90moe Well-Known Member

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    Did you check for any codes?

    Also, if fuel level was low and on the track it could be fuel starvation
     
  3. fireball

    fireball Active Member

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    What QR event was this ? I've been meaning to go out with the supra but have just been just too busy :(. at a guess it could be fuel because jackie ding did mention having to run a full tank to avoid cut out in 1 video. the other like you mentioned could be overheating
     
  4. OP
    OP
    wtf

    wtf Well-Known Member

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    Unfortunately I had power cycled before I got a chance to check, but there was no fuel starvation issues. Last night it did it on the highway with a full tank of fuel, in a straight line..

    If starvation you'd expect it to happen on heavy cornering, but every time it's happened was half way down a 1km straight, which is about as far from a corner as you'd get.

    Confusing me greatly, and strange more people aren't experiencing it.
     
  5. OP
    OP
    wtf

    wtf Well-Known Member

    First Name:
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    First event was King of QR, came third in "Track tuned forced induction class" completely stock.

    Second event was with the new wheels and tyres, at a regular sprint day.

    Does very well for a stock car, but it's atrocious ESC/TRC tries to put you into the wall even when it's disabled..

    Not impressed with some of the track handling at or on the limit in the car.
     
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  6. fireball

    fireball Active Member

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  7. XPOTTEDPLANTX

    XPOTTEDPLANTX Well-Known Member

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    Never heard of or felt any power loss other than when traction control is triggered.
     
  8. OP
    OP
    wtf

    wtf Well-Known Member

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    Yeah at those speeds traction control not an issue, this is at 140+kph then just stops accelerating normally..


    First track day I didnt do an alignment, but there was very little alignment adjustment on the car anyway, the front gives you a tiny bit of caster/toe but that's all.

    My alignment from stock was pretty much spot on.
     
  9. Twisted Tuning

    Twisted Tuning Well-Known Member
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    OP, your car is stock entirely, or stock physically with tune?
     
  10. OP
    OP
    wtf

    wtf Well-Known Member

    First Name:
    Mark
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    Bone stock.

    Not even an exhaust.
     
  11. a90moe

    a90moe Well-Known Member

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    Try to replicate and then scan for codes :)
     
  12. OP
    OP
    wtf

    wtf Well-Known Member

    First Name:
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    Had expected it was only a track day thing, so didnt really think to log street driving..

    I might start logging next time i take the car for a drive... But it has never done it in 3000km driving, except on the track, so might be needing a good flogging for it to happen aaha
     
  13. s219

    s219 Well-Known Member

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    Jackie Ding experienced this I believe. There can be a range of reasons. I think that even things that affect tire pressure, TPMS, tire size, ABS sensor, etc can trigger various limp modes. Transmission or differential temperature may also be a trigger.
     
  14. Torquem

    Torquem Well-Known Member

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    I was reading another forum member that was complaining of cut power after flogging on his car. Street driving. Said after a few minutes of normal driving it would go away. Would make me think it is temp related.
     
  15. Twisted Tuning

    Twisted Tuning Well-Known Member
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    The issue is the trans, or the rear diff.
     

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