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1 bar MAP and turbos

This is a discussion on 1 bar MAP and turbos within the Forced Induction forums, part of the LSx Technical Help Section category; I was talking with a guy that programs ECMs, and he stated that for boost levels of 7-8psi, that he ...

  1. #1
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    1 bar MAP and turbos

    I was talking with a guy that programs ECMs, and he stated that for boost levels of 7-8psi, that he can easily program the computer to run with a 1 bar MAP sensor. How is this possible? How can the computer detect the boost?

    This guy is a pro, so I am sure there is something I am missing, but I don't know what.

    Thanks.

  2. #2
    Member Boosted89rs's Avatar
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    once the map sensor is maxed 0.5 psi or so the computer goes into pe mode allowing u to tune it a lil bit depending on the ecm

    89 RS 3.1L v6 1LE suspension,wonderbar ,3way drag shocks ,(iroc taillights,gauge cluster,steering wheel,rims)
    t67 turbo 27+ psi,100 wetshot,and a 4500 converter

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    Do you get more tunability with the 2 bar MAP? Otherwise, why use it if you can tweak in PE mode?

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    Member Boosted89rs's Avatar
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    Quote Originally Posted by general23cmp View Post
    Do you get more tunability with the 2 bar MAP? Otherwise, why use it if you can tweak in PE mode?
    if the ecm can be made to read a 2 bar map yes u get alot more tuneability
    tuning it in pe mode with a 1 bar sensor is pretty much only tuned for wot/max boost.
    the ecm does not know if u are at 2 psi or 7 psi, it only knows that u have gone above the map limit

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    Member cailey37's Avatar
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    Not sure why he'd want to use a 1 bar sensor....these are typically just for N/A cars.........would be curious as to his reasoning on this one......think I'd ask some more questions on that.....

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    Member Boosted89rs's Avatar
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    Quote Originally Posted by cailey37 View Post
    Not sure why he'd want to use a 1 bar sensor....these are typically just for N/A cars.........would be curious as to his reasoning on this one......think I'd ask some more questions on that.....
    the onyl reason to tune with a 1 bar map would be if the stock ecm couldnot use a 2bar+ map and would only see low boost.

  7. #7
    Junior Member JunkyardTurbos's Avatar
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    1 bar is tunable until you max the MAF around 512g/sec. Then it's time for a 2 or 3 bar speed density setup.

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