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Thread: MAP + TPS: Am I choking my engine?

  1. #1
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    MAP + TPS: Am I choking my engine?

    Hello everybody.

    I have a single seat AR51 buggy with a 2006 GSXR1000 motor and I have a question.

    Some info:

    The conventional wisdom with running these motors in an off road buggy is that the standard air filter is not good enough to cope with the dirt/dust etc. So as a quick and easy solution I have cut the ends off 2 foam pod filters and stuck them over the 2 intakes leading to the stock airbox. I have a "standard" K&N filter inside the airbox as per normal.

    Now after cutting some laps on the weekend I have pulled the datalogs (I run the woolich racing ecu editor setup) and I have found my manifold pressure hits a brick wall at around 71kpa. From 30-80% TPS it doesnt seem to change. It seems to run pretty damn well, although it was bogging down in some of the deeper sandy sections of the track.

    Is this normal?
    Do many motors see the magical 101kpa(atmospheric pressure)??
    Am I choking my motor with my dodgy pre-filter setup?

    Some pics for info and showing off. (If you zoom in on the third one you can see the "pre-filter" on one side.














  2. #2
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    You should definitely be soon closer to 100kpa. There's a restriction somewhere. Fuck that looks like fun

  3. #3
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    And a vid...


  4. #4
    Unregistered User Permit Roadsailing's Avatar
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    Drive it somewhere clean with the pre filters off?

  5. #5
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    Ok so I went through a few datalogs and found that the MAP is reading 75kpa with the engine off. Digging around to try and find if this is the normal range for a GSXR MAP sensor.

  6. #6
    Purist, whats that? Jason Broadhurst's Avatar
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    Probably the sensor scale. What ecu?
    Jason Broadhurst

    Someone once asked me if they could use my mower. I said "sure, so long as it doesn't leave my yard"

  7. #7
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    Stock suzuki with the woolich racing editing box and software.

    I will ask on their forum as well.

  8. #8
    Purist, whats that? Jason Broadhurst's Avatar
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    I would check the sensor voltages. You should expect about 4.7v at atmospheric but look up a 1 bar MAP sensor voltage table to confirm.

    It could be scaling in the log viewer too.
    Jason Broadhurst

    Someone once asked me if they could use my mower. I said "sure, so long as it doesn't leave my yard"

  9. #9
    sack riding 10sec rx7's Avatar
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    whats it read with key on and engine off
    im a cunt
    and apparently i dont know shit...

  10. #10
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    It reads 75kpa.

  11. #11
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    I will have to call woolich tomorrow and find out if this is normal. My understanding of it is that over a certain kpa it switches from MAPxRPM to TPSxRPM, so maybe the suzuki MAP sensor only goes to 75kpa??

  12. #12
    Purist, whats that? Jason Broadhurst's Avatar
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    It will be a 1 bar sensor for an NA car mate.
    Jason Broadhurst

    Someone once asked me if they could use my mower. I said "sure, so long as it doesn't leave my yard"

  13. #13
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    Thats what I thought yes.

  14. #14
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    Ok so it seems a new genuine one is around $150. Is there any reason I can't use an aftermarket one or is the scaling different? The woolich tuning software doesn't seem to have any features to adjust the scaling of the MAP sensor. I guess it assumes you will use the stock one.

  15. #15
    Registered User Euronymous's Avatar
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    I have nothing useless to add, but came to say, fuck this thing is tits!

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