RPM and Speed bounce/boggles

Discussion in 'Mazdaspeed 3 Troubleshooting' started by Ms3orDie, Mar 10, 2021.

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  1. Ms3orDie

    Ms3orDie Greenie Member

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    I am not sure whats wrong but when im in 2nd and 3rd gear driving like a grandma, from 2k to 3k on the rpm, the rpm sorta struggles to get to 3k. The rpm bounces, you can hear the engine sorta struggles to get to 3k and you can feel it throughout the entire car. But if i dont drive like a grandma and step on it to get boost, it drives fine. Looking around the engine bay i am not seeing anything that could cause this issue. Could it be because I have all damond mounts? Maybe someone has dealt with this before and can chime in? Appreciate it.
     
    Ms3orDie, via an iPhone, Mar 10, 2021
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  2. JohnnyTightlips

    JohnnyTightlips Motorhead Silver Member

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    Do you have a logs, have you checked fuel pressure?
     
  3. Ms3orDie

    Ms3orDie Greenie Member

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    No logs but i will log today. Fuel pressure looks good.
     
    Ms3orDie, via an iPhone, Mar 10, 2021
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  4. Awafrican

    Awafrican Moderator Gold Member

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    Definitely not because of your damond mounts.

    What's your fuel pressure send Afr? Try taking some logs also how old are your spark plugs
     
    Awafrican, via a mobile device, Mar 10, 2021
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  5. Ms3orDie

    Ms3orDie Greenie Member

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    Here is a log for my drive home from work. The plugs are maybe over 10k old. I do have new ones and am planning to install them this weekend when I do the valve cleaning work and CS Injector Seals. I noticed when the boggle happens, the AP AFR reading is very sporadic jumping back and fourth from any value between 8 to 20 very fast. But, my wideband AFR gauge bounces between 14-15.
     

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    Last edited: Mar 10, 2021
  6. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Check the wires at the maf sensor
     
    Easter Bunny, via a mobile device, Mar 10, 2021
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  7. Ms3orDie

    Ms3orDie Greenie Member

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    maf wire and connections look good. Also cleaned the maf as well. I could not locate the issue. I am hoping its something simple :tired:
     
  8. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Did you jiggle the wires while the car was running

    How much boost are you able to hit?
     
    Easter Bunny, via a mobile device, Mar 10, 2021
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  9. Ms3orDie

    Ms3orDie Greenie Member

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    I jiggled the wire this morning and no changes. Max boost is set for 25 and i was able to hit 24 psi. I am not sure if i am saying this correctly but it seem to take long to hit 24. I hit 24 at the end of my powerband. If that makes sense.
     
    Last edited: Mar 11, 2021
    Ms3orDie, via an iPhone, Mar 11, 2021
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  10. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    Boost leak
     
    Easter Bunny, via a mobile device, Mar 11, 2021
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  11. Ms3orDie

    Ms3orDie Greenie Member

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    Yeah im googling symptoms right now and its suggesting a boost leak. I have no idea how to look for the leak but ill research a bit.
     
    Ms3orDie, via an iPhone, Mar 11, 2021
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  12. neganox

    neganox Feline Führer Moderator Platinum Member

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  13. Ms3orDie

    Ms3orDie Greenie Member

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    Ms3orDie, via an iPhone, Mar 11, 2021
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  14. Mikey27

    Mikey27 MSM Motorsports Greenie Member

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    What bpv/bov are you running?
     
    Mikey27, via a mobile device, Mar 20, 2021
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  15. Ms3orDie

    Ms3orDie Greenie Member

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    I am running a turbosmart bov. Ive noticed if i move the nozzle for soft/hard it affects the boggling that i mentioned.
     
    Ms3orDie, via an iPhone, Mar 26, 2021
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  16. Mikey27

    Mikey27 MSM Motorsports Greenie Member

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    That's exactly it. The tension is too soft and the valve is hanging open causing a massive vac/boost leak.

    Need to fine tune the valve, on that one you're likely going to have to crank it all the way down iirc.
     
    Mikey27, via a mobile device, Mar 26, 2021
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  17. Ms3orDie

    Ms3orDie Greenie Member

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    So crank it all the down to soft? I have it in the middle right now.
     
    Ms3orDie, via an iPhone, Mar 26, 2021
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  18. Mikey27

    Mikey27 MSM Motorsports Greenie Member

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    Turn it clockwise (in/down etc.) to "hard".
     
    Mikey27, via a mobile device, Mar 26, 2021
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  19. Ms3orDie

    Ms3orDie Greenie Member

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    I will try this. Thanks!
     
    Ms3orDie, via an iPhone, Mar 26, 2021
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  20. JohnnyTightlips

    JohnnyTightlips Motorhead Silver Member

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    I had this issue with my Precision 50mm BOV, I ended up needing another washer to get the pressure right for when my car pulls 11 psi of vac at idle and clutch in. This is not uncommon for bigger BOV's to need adjusting like that. If you can't seem to get it right you might be able to add a washer as well to increase the spring tension.
     
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