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  1. #1
    Sturm215's Avatar
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    make sure to check afr's

    I have the 8350 tune and run a et 140r charger with bosch 48's ext cooler and got the tune and runs incredibly rich at idle and mid.. idle is mid 11's ... can't correct it with the regulator.. so I have to get another flash.. hoping to do some datalogging so I can get it to vtech so I can get it spot on. Other than that.. the handheld unit is a breeze and just the fact you can do it yourself is a plus. Mine doesn't bog down low but can definatly feel some sluggishness.


  2. #2
    Bob 1tommygunner1927's Avatar
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    How many tunes have you received/tried? IMO, its better slightly too rich than too lean.....but low/mid 11's is simply too rich at idle. VTech needs to get this corrected fast!!!

  3. #3
    Sturm215's Avatar
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    I'm sure they will haven't got with them yet been too busy

  4. #4
    Adrenaline Junkie's Avatar
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    Interesting. I'm running the 8650 on my 08 PX. Stocker sc and injectors so didn't bother with AFR gear but noticed it was idling really rough when it was cold two days in Parker last weekend. Seemed like it may have been knocking but hard to tell with a helmet. I think I'll run it today in Phoenix, which is about 1000 feet higher in elevation, and see if it's still idling rough.

  5. #5
    Bob 1tommygunner1927's Avatar
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    If its running rich at sea level, it will be richer still at altitude.....less oxygen.

  6. #6
    Moderator beerdart's Avatar
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    The stock ECU compensates for altitude. Not sure if the V-Tech defeated this or not.
    Quote Originally Posted by 1tommygunner1927 View Post
    If its running rich at sea level, it will be richer still at altitude.....less oxygen.

  7. #7
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by beerdart View Post
    The stock ECU compensates for altitude. Not sure if the V-Tech defeated this or not.
    How so?

  8. #8
    Moderator beerdart's Avatar
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    Err MAP
    Quote Originally Posted by 1tommygunner1927 View Post
    How so?

  9. #9
    Bob 1tommygunner1927's Avatar
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    Manifold Air Pressure.......the fuel map in the ecu is fixed.......the map "senses" less pressure but the fuel map is fixed........what makes the adjustment to the fuel map? If its the MAP sensor, then why can't it go the other way......when pressure is higher......like with more boost?

    Now I'm confused......

  10. #10
    Adrenaline Junkie's Avatar
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    Quote Originally Posted by silicon View Post
    Interesting. I'm running the 8650 on my 08 PX. Stocker sc and injectors so didn't bother with AFR gear but noticed it was idling really rough when it was cold two days in Parker last weekend. Seemed like it may have been knocking but hard to tell with a helmet. I think I'll run it today in Phoenix, which is about 1000 feet higher in elevation, and see if it's still idling rough.
    Turns out this issue was just coincidence; had nothing to do with the vtech. Bad intercooler and was ingesting water. These intercoolers are dropping like flies. Friend of mine had two go bad on two different skis of his in the last month. If you have an x boat intercooler; beware.

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