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Thread: Turbo: nobody home?

  1. #61
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    Quote Originally Posted by jthj View Post
    Octane compensation had occurred to me also but if he*s bellow 4k I dunno.

    Or just a tuning quirk.
    Maybe it's a quirk of exhaust flow that somehow keeps the "butterflies" closed longer than should be, and limits air to the turbo?

  2. #62
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    Quote Originally Posted by 2001birdowner View Post
    After driving a GT-R for a few weeks now, I know exactly what Savage Geese is talking about. Sometimes I get on it and the throttle response is there but it just feels like itís lacking power.

    Today I noticed it on the way into work. After 8 miles at 75 I got off the highway and had to stop for a red light at the end of the exit. Light turned green and I stomped on it expecting the 310 ft pounds to thrust me to 40 in no time. Not quite what happened. It got me there just didnít push me into the seat like it should have. Shifted at about 4K into second in auto non sport mode.

    I was only stopped at the light for a few seconds and itís 10 degrees, so heat soaking shouldnít be the issue.
    As a rule of thumb on my non turbo but tuned cx5, I almost always turn TCS off when I'm moving from a stop ( I tend to wring first gear). And click it back on when I move to D. Might wanna try it.

  3. #63
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    Quote Originally Posted by Chris_Top_Her View Post
    As a rule of thumb on my non turbo but tuned cx5, I almost always turn TCS off when I'm moving from a stop ( I tend to wring first gear). And click it back on when I move to D. Might wanna try it.
    What does turning the TCS off moving from a stop accomplish?

    I legit don't know.
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  4. #64
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    Quote Originally Posted by ColoradoDriver View Post
    What does turning the TCS off moving from a stop accomplish?

    I legit don't know.
    I believe the traction control pulls power when it detects slip. So it would prevent that I think.

  5. #65
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    Quote Originally Posted by jthj View Post
    I believe the traction control pulls power when it detects slip. So it would prevent that I think.
    Ah. Thank you.
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  6. #66
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    Iíve been using shell v-power 93, so octane isnít a problem. It could be a combination of all the things folks are mentioning(hopefully not the manifold valve malfunctioning). It was only in the single digits today, so weather could be playing a big factor. However, in my experience, colder temps have helped performance. This is my first turbo charged vehicle though.

    Iím thinking it might just be the way this car feels. I took the long home today get more time behind the wheel. If I roll into the throttle around 2500 when the car is already moving, it feels great. If I just stomp on it from a stop, Iím not impressed. It could be that all that torque is dropping off around 4K and the 250 HP just feels meh compared to the 310 ft pounds.

    If only Mazda installed a boost gauge so that I could feel better about there not being an actual problem.

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    Cold is good boost weather but not good traction weather.

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    Quote Originally Posted by 2001birdowner View Post
    I*ve been using shell v-power 93, so octane isn*t a problem. It could be a combination of all the things folks are mentioning(hopefully not the manifold valve malfunctioning). It was only in the single digits today, so weather could be playing a big factor. However, in my experience, colder temps have helped performance. This is my first turbo charged vehicle though.

    I*m thinking it might just be the way this car feels. I took the long home today get more time behind the wheel. If I roll into the throttle around 2500 when the car is already moving, it feels great. If I just stomp on it from a stop, I*m not impressed. It could be that all that torque is dropping off around 4K and the 250 HP just feels meh compared to the 310 ft pounds.

    If only Mazda installed a boost gauge so that I could feel better about there not being an actual problem.
    I sincerely doubt it's the manifold valve. I know I talk some shit, but Mazda has consistently been VERY on-point with their SA-G (T/NA) engine designs. I don't honestly think we can point to any SA non-diesel engine and say "See? that's a model to avoid because..."

    I simply mentioned it because it is always possible. Likely? Doubt it, but it is certainly a thing.

  9. #69
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    Well...discovered this tonight, myself. Turbo was home, but something is up. 0-60 in about 10 seconds, 0-85 in about 16 seconds. I was running 91 octane. Still, that's a HUGE gap in performance from what SHOULD be happening. It IS 12*F out. I turned TC/stability control off, and couldn't even squeak a tire neither on a shift or stomping it from a stand-still. The vehicle was plenty warmed up as I'd driven it for half an hour.

    My only explanation for this is that Mazda has tuned it to pull mad timing in the cold to prevent loss of control/spinning at low speeds/launch. It still felt find from a 60mph punch. If anything was "off" bad enough to add 4 seconds to my 0-60 times, it would have lit the dash up like a christmas tree.

    I will call Mazda in the morning and get answers. If this is a feature...okay...weird flex, Mazda...weird flex. But if it's a bug, I want it fixed yesterday.
    Last edited by Unobtanium; 03-06-2019 at 06:50 AM.

  10. #70
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    Sounds very similar to what Iíve experienced. How were you measuring 0-60?
    Last edited by 2001birdowner; 03-06-2019 at 07:17 AM.

  11. #71
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    Quote Originally Posted by 2001birdowner View Post
    Sounds very similar to what I*ve experienced. How were you measuring 0-60?
    I videoed it and then timed that.

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    That seems like a large difference. I think itís safe to rule out heat soak but even if it was it shouldnít reduce the power that much IMO.

  13. #73
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    Quote Originally Posted by jthj View Post
    That seems like a large difference. I think it*s safe to rule out heat soak but even if it was it shouldn*t reduce the power that much IMO.
    Who knows, but yeah, it FELT weak as hell, too. It's honestly not something I'm very happy about right now. Felt totally gutless.

  14. #74
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    Quote Originally Posted by Unobtanium View Post
    Who knows, but yeah, it FELT weak as hell, too. It's honestly not something I'm very happy about right now. Felt totally gutless.
    Yeesh. Sounds awful.
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  15. #75
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    Quote Originally Posted by ColoradoDriver View Post
    Yeesh. Sounds awful.
    Yeah, pretty much.

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