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  1. #1
    MM-FXSVHO's Avatar
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    3 Bar Map Sensor Needed?

    Hoping someone can shed some light on whether a 3 bar map sensor is needed for 20lb boost pressures. According to the info on Riva and other sites, its needed for anything above 14.7 psi, but hearing from many other sources that as long as you have an aftermarket fuel system and dialed in correct AFRís, itís not needed. As reference, this is for a stage 3+ 20lb wheel FX SVHO running 87mph. Thanks!

  2. #2
    Hurricane1000's Avatar
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    Are you running a maptuner?
    Or Dean's Team flash?

    Dave

  3. #3
    MM-FXSVHO's Avatar
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    Maptuner

  4. #4
    im running a riva maptune 9500/17lb tune with riva 100lb inj. stock fuel pump. no 3 bar sensor.i check my afr and text jesus and he made the fix for me in the tune. a friend of mine is running a 20lb wheel riva maptune 9500/20lb tune 100lb inj. stock fuel pump, no 3 bar sensor...

  5. #5
    You dont need it for the riva tunes but if you data log you wont get a true reading with the stock one maxed out around 16psi


  6. #6
    mittens's Avatar
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    My question here is how come everyone is ok running a factory 2 bar? That's only 14.7psi.. The stock wheel at 9000-95000 is well over that.


  7. #7
    Its not ideal but you can tune an ecu without so not necessarily needed for the majority of people is what I would assume

  8. #8

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    1 bar is 14 psi and 2 bar is 29 psi. I run the 3 bar in my skis.

    Robert

  9. #9
    Quote Originally Posted by mwhc View Post
    Its not ideal but you can tune an ecu without so not necessarily needed for the majority of people is what I would assume
    jesus said i would be ok with the 2 bar if he would have said i needed the 3 bar i woud have done it...so that what im tuned for high 87 to low 88 mph at 9120-9200r's arf at 11.9-12 in the spring so its a little rich during the summer.

  10. #10
    mittens's Avatar
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    Quote Originally Posted by rcrisafulli View Post
    1 bar is 14 psi and 2 bar is 29 psi. I run the 3 bar in my skis.

    Robert
    that is not correct. A 2 bar map sensor can read up to 29.4 psi.... but atmospheric pressure is 14.7.. so a 2 Bar map sensors can only read 14.7 psi above atmospheric pressure/boost.

    a 3 bar is needed for 14.7- 29.4lbs above atmosphere/boost.

    look it up.

    that being said.
    When I read a tuner (Dean or Jesus whom ever) says they can tune it based on a 2 bar when the ski is pushing more then 14.7lbs of boost. I read it as "I will follow the linear graph I see with boost vs rpm and fuel needs (as boost and rpm are directly related) and will faten the tune appropriately to be close on anything above 14.7lbs."

    but the correct answer is to have a tune set up to add fuel for the air/boost it measures and not guess on the top end. Granted causes customers don't want to buy more parts and we want to go fast cheaper. But it is what it is.

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