734 AWHP and 9000 RPM Mazdaspeed6 Dragcar

Discussion in 'Damond Motorsports' started by Farhan@DM, May 30, 2018.

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  1. StreetSpeed6

    StreetSpeed6 Welder Silver Member

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    Versatune allows for tuning up to like 8k right? Where does the AP stop at?
     
    StreetSpeed6, via an iPhone, Jan 13, 2019
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  2. mituc

    mituc Greenie Member

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    Yes, by default it allows you to tune up to the maximum values embedded into the ECU. But since a few years it allows you to override these values and I think the limit of the maximum values. By example you can tune past 4BAR of boost, past load 4, past 8k rpm, and so on.
    When they launched this feature I remember them saying that at least for load and RPM which a lot of tables are scaled for, these tables will be rescaled at a lower resolution by increasing the step in the last part of the table: by example for a load based table, instead of having the load step increased with 0.125 between load 2 and load 4 in those tables, it will to go, say, 0.150. This is needed for the tables to require the same size in the ECU memory.
    Of course you can't increase these limits for voltages which is enforced by how sensors work (say, MAF voltage from 5 to 6V or something), or if a number is held internally on 8 bits to go to values that need 16 (or 9) because of how these values are written in the ECU memory location, but increasing absolute RPM from 8 to 10K should not be a problem.

    Better contact them if this seems to be a possible solution for you. If it works the way you want it may be a lot cheaper than going stand-alone.

    I thinkthe AP stops at 7k and will interpolate the table/curve/whatever based on the shape of the curve/table. This is what it does with the load tables, ignition tables and everything, past 7k.
     
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  3. mituc

    mituc Greenie Member

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    @steve@versatune - what do you think? I know this is kind of untested territory but can this work?
     
  4. steve@versatune

    steve@versatune Approved Vendor

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    Not entirely untested territory for VT. Teo used VersaTuner to get 803whp from is AWD Mazd3 MPS. He launched at 8000 rpm.
     
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  5. steve@versatune

    steve@versatune Approved Vendor

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    Farhan tried using VT, but had issues over 8k. If anyone else wants to test, I am happy to work with you. I believe that all the software based rpm limits are exposed in VT. My remaining question is at what point does the ECU no longer have enough processing power to keep up and fire the needed interrupts to keep things running over 8k.
     
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  6. StreetSpeed6

    StreetSpeed6 Welder Silver Member

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    I would assume if nothing else reliability could definitely become a worry, or at least in my opinion, when revving above 8K anyways. I am just aiming to safely rev to around 8. If I had the $$$ I would definitely experiment tho.
     
    StreetSpeed6, via an iPhone, Jan 15, 2019
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  7. Sho

    Sho Platinum Member

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    Gen1/ms6 ecu has a hard cut somewhere above 7800rpm iirc .if you stay above that rpm too long, the car shuts off
     
    Sho, via a mobile device, Jan 15, 2019
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  8. steve@versatune

    steve@versatune Approved Vendor

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    Using what tuning solution to raise the rev limiter?
     
  9. Sho

    Sho Platinum Member

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    Cobb. Sorry. Thought I quoted StreetSpeed6
     
    Sho, via a mobile device, Jan 15, 2019
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  10. steve@versatune

    steve@versatune Approved Vendor

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    VT has additional rev limit constants exposed.
     

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