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Thread: e40 2 bar scanning issue

  1. #1
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    e40 2 bar scanning issue

    I've been all over the forums looking for this answer and I'm sure somebody else has come across it.

    The LS2 cars do not have a 2 bar or 2.5 bar PID i understand that but how do you properly scale the map sensor in that case in the scanner.

    Everything points to the sensor reading 80kpa when it should be reading 40 and 160 when it should be reading 80.

    At first glance I would assume the sensor is stock and not reading correctly but then I've verified and tried 2 different 2 bar cobalt ss sensors.

    Never had an issue like this....

    Before you scream at me for show me your config file...lets talk generalities so we can help anybody else with this issue.

    uploading a histogram does you no good if its still documenting values above 105kpa that are not actually boost on the gauge....the point here is to actually tune the correct cells at the correct pressure.

    The histogram is pulling the exact same value as the graph....furthurmore the computer is behaving like those are actually the cells its tuning from. I'm having to scale the MAP table in half to get it to trim back to previous?

    Back to the computer reading the wrong sensor would be the assumption while setup for 2 bar. sensor is 12615136 (revised gm number for the ss cobalt) . Stock sensor is reading the same??? but I've got 2 of these sensors and a duralast su1078...have i just been steered wrong on the sensor P/N?

    I've got to ask...is there a glitch in the 2 bar OS? what am I missing...I've gone back to stock with the one exception ....it was previously patched for 15000HZ for a larger MAF.

    I'll upload my files but they are a mess as I've been feeling around with this trying to find home so no grief over final tune this or that...this is purely to find home and figure out the MAP scaling.

    Feeling like a moron who's never touched one of these cars...please help!

  2. #2
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    Electromechanically speaking the 2 bar should be reading at the exact same voltage

    half the airflow correct? Considering 0-5 volts would be covering double the range?

    Unpatched you should be able to put a 2 bar in a one bar os and scale the map table losing half the resolution....in theory.

    Still not helping me figure out why the stock is reading the same as the 2 bar but this kind of information is always helpful for the next person that has this or similar issues.

  3. #3
    Senior Tuner DSteck's Avatar
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    Take a pic of the sensors you're using and be sure the label shows.

    DSX Tuning - Authorized HP Tuners Dealer
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  4. #4
    Senior Tuner DSteck's Avatar
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    I can hook you up with a 2.5 bar sensor and proper calibration data... Just saying.

    DSX Tuning - Authorized HP Tuners Dealer
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  5. #5
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    I found the same site for the duralast sensor and the manufacturer that stated the su1078 was a 1 bar...so I grant you that. However, what's the story with the GM sensor reading like a 1 bar? (attached is a picture of it). Whats the GM P/N for the 2.5 bar?

  6. #6
    Senior Tuner DSteck's Avatar
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    That's a 1 bar sensor in the pic.

    There is no part number for a plug and play 2.5 sensor. There's a Cobalt 2.5 TMAP sensor but it isn't just plug in and go. The PnP 2.5 sensor is custom made. PM me for more info.

    DSX Tuning - Authorized HP Tuners Dealer
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  7. #7
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    I will say this the 12615136 that i have fails the eye test vs the earlier 0698 and some pics of this same P/N sensor on google with the double sided ears. There's something fishy with this P/N. Ordered a 12614973 just now and hoping that's correct.

  8. #8
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    Quote Originally Posted by DSteck View Post
    That's a 1 bar sensor in the pic.

    There is no part number for a plug and play 2.5 sensor. There's a Cobalt 2.5 TMAP sensor but it isn't just plug in and go. The PnP 2.5 sensor is custom made. PM me for more info.
    right the 2.5 bar requires a pigtail change and has the temp in it as well...figured that's what your talking about. 12615136 is listed as the 2 bar replacement throughout the forums here as the new replacement for the 0698 sensor...how did you arrive at the 1 bar conclusion because I concur but I want to get to the bottom of this stupidity so others don't have this issue.

    http://ls1tech.com/forums/forced-ind...d-density.html

    a correct looking pic at least of this same p/n

  9. #9
    Senior Tuner DSteck's Avatar
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    I prefer these. No BS, proper data, and they plug right in.

    DSX Tuning - Authorized HP Tuners Dealer
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  10. #10
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    I give up...I'm ordering a ZR1 sensor and wiring that in... 12614973 reads 161 kpa engine off (should be 80 here) just like the rest of the sensors.

  11. #11
    Senior Tuner DSteck's Avatar
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    ZR1 sensor won't work with the E40. You'd have to drill out the manifold to fit it, but the E40 only accepts a max of 256kPa in the linear value. The ZR1 sensor uses 312.50 in there.



    The sensor I posted a pic of will do what you want. I'll even set your file up for you.

    DSX Tuning - Authorized HP Tuners Dealer
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    Just say no to bull s***.
    IF YOU WANT HELP, POST A FILE!