Results 1 to 17 of 17

Thread: Boost Reading

  1. #1
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7

    Boost Reading

    Hi,

    I am new on this World of HP Tuner and American Cars. I am helping to a friend to tun e his car. I read some manuals online and look at the forum to start the game.

    My main problem is with the boost reading, I made a Histogram for boost using the Map PID minus 14.7 but the car dont past of 0.24 on the value, even if the car is going with 2 psi or 4 psi.

    Thanks for your help and advices.

    Regards.
    Attached Images Attached Images
    Attached Files Attached Files

  2. #2
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7
    The car is a Camaro LS1 5.7 1998.

  3. #3
    Tuning Addict
    Join Date
    Jan 2015
    Location
    Franklin, NC / Gainesville, Ga
    Posts
    6,733
    You forgot to make it imperial. Should look like this. [PID.11.IMP]-14.5
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  4. #4
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7
    I just tried but now is showing high outputs at wot. See the attachment please.
    Attached Images Attached Images

  5. #5
    Senior Tuner mowton's Avatar
    Join Date
    Mar 2007
    Location
    Florida
    Posts
    3,773
    Do you have a 2 bar map sensor in the car? If so you need to log the 2 Bar PID.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    [email protected]

  6. #6
    Tuning Addict
    Join Date
    Jan 2015
    Location
    Franklin, NC / Gainesville, Ga
    Posts
    6,733
    Your Map is way off in your tune (356kpa) --- Even at our altitude if I do my math right 356kpa - 91kpa "my baro" = 265kpa, 265kpa converted to psi (265x.14503773773020923=38.435psi) - Plus there's the fact that your only flowing 248.37g/sec on your Maf "at the very same time the map reading is", indicates your only making somewhere in the neighborhood of 298hp at the same moment the supposedly 38.435psi of boost was being made. This all tells me the map is way off in your tune. With the key on you should be reading "your" barometric pressure whatever that may be. You can install a scan tool in a "like" vehicle or average out 3 different vehicles readings if your unsure of this.

    After you get your map fixed and your baro figured out, just reverse the math shown above to get "your" atmospheric value to subtract from the PID. This should be pretty spot on after you get all this fixed.

    Hope this helps.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  7. #7
    Senior Tuner mowton's Avatar
    Join Date
    Mar 2007
    Location
    Florida
    Posts
    3,773
    Quote Originally Posted by GHuggins View Post
    Your Map is way off in your tune (356kpa) --- Even at our altitude if I do my math right 356kpa - 91kpa "my baro" = 265kpa, 265kpa converted to psi (265x.14503773773020923=38.435psi) - Plus there's the fact that your only flowing 248.37g/sec on your Maf "at the very same time the map reading is", indicates your only making somewhere in the neighborhood of 298hp at the same moment the supposedly 38.435psi of boost was being made. This all tells me the map is way off in your tune. With the key on you should be reading "your" barometric pressure whatever that may be. You can install a scan tool in a "like" vehicle or average out 3 different vehicles readings if your unsure of this.

    After you get your map fixed and your baro figured out, just reverse the math shown above to get "your" atmospheric value to subtract from the PID. This should be pretty spot on after you get all this fixed.

    Hope this helps.
    I want to know where the 356 MAP reading came from, the log he posted was 42 KPa at idle (cool) and slowly ramped up to 103 at full throttle (Boost) and why originally he only showed .24 of boost.. which told me he only had a 1 bar map sensor???????

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    [email protected]

  8. #8
    Tuning Addict
    Join Date
    Jan 2015
    Location
    Franklin, NC / Gainesville, Ga
    Posts
    6,733
    Am I looking at the wrong thumbs? The one picture below his last post shows 356.6Kpa on the bar graph with the histogram pegged at 15.2 psi. BUT your right, I didn't look at the first thumbs. In those it shows the boost starting at 2.2 and then building to 8psi. Guess it's just how he has his datalogger setup as you stated with the 2bar.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  9. #9
    Senior Tuner mowton's Avatar
    Join Date
    Mar 2007
    Location
    Florida
    Posts
    3,773
    Quote Originally Posted by LS1_Guy View Post
    I just tried but now is showing high outputs at wot. See the attachment please.
    Help us out, what are the two logs you posted, they look completely different? Which is correct? What PIDs are you using? Do you have a 2 Bar Map sensor in the car?

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    [email protected]

  10. #10
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7
    Thanks Guys,
    I just test the car again rigth know. I uploaded the log and config file.

    The Map sensor is Just 1Bar. The boost gauge show us 5 psi on this test. So i dont understand why the map stuck in 53kpa with the 4 psi pulley(before) and the 8 psi pulley (now).

    Thanks for your help.
    Attached Files Attached Files

  11. #11
    Senior Tuner mowton's Avatar
    Join Date
    Mar 2007
    Location
    Florida
    Posts
    3,773
    Quote Originally Posted by LS1_Guy View Post
    Thanks Guys,
    I just test the car again rigth know. I uploaded the log and config file.

    The Map sensor is Just 1Bar. The boost gauge show us 5 psi on this test. So i dont understand why the map stuck in 53kpa with the 4 psi pulley(before) and the 8 psi pulley (now).

    Thanks for your help.
    I am sorry but I dont have a clue what you are saying or asking? Your MAP is pegged at 103 in WOT which is about as high as the 1 bar sesor will go. Where is the MAP stuck at 53kPa? There is no Boost PID in your supplied .cfg!....please reiterate your question and the data you are providing in support of it.

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    [email protected]

  12. #12
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7
    I am talking about difference in the map reading in the gauge and the table display. 53kpa vrs 107kpa at wot. The boost gauge on the car show us 5 psi at wot and the BOOST on the table display shows 0.44 psi.

    Sorry for my english. lol
    Attached Images Attached Images

  13. #13
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7
    In the honda world the oem Map sensor 1bar can hold up to 10 psi, but i am assuming that is the same thing here, Is that my mistake ?

  14. #14
    Senior Tuner SultanHassanMasTuning's Avatar
    Join Date
    Nov 2009
    Location
    All Around
    Posts
    3,149
    the honda is 1.7 bar stock, LS1 is 1 bar =100kpa only.

    you need to switch to a difference map sensor to support high boost reading and to properly tune the vehicle



    Quote Originally Posted by LS1_Guy View Post
    In the honda world the oem Map sensor 1bar can hold up to 10 psi, but i am assuming that is the same thing here, Is that my mistake ?
    Follow @MASTUNING visit www.mastuned.com
    Remote Tuning [email protected]
    Contact/Whatsapp +966555366161

  15. #15
    Senior Tuner mowton's Avatar
    Join Date
    Mar 2007
    Location
    Florida
    Posts
    3,773
    So the simple answer to your question is the 1 Bar MAP PID is capped at 103 kPa as the MAP sensor is also. That is the limit you can get unless you add a 2bar sensor. Interestingly, I fanagled the Custom PID for an hour or so and couldnt get the .imp to report PSI???? I eventually had to add the conversion factor to the PID??? So what was I doing wrong? Also at some point I mangaed to change the PID and F'd up the MAP PID to a huge number....much like the thumbnail picture up above, again dont know how that happened???

    sorry

    Ed M
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    [email protected]

  16. #16
    Potential Tuner
    Join Date
    Mar 2015
    Posts
    7
    Quote Originally Posted by SultanHassanMasTuning View Post
    the honda is 1.7 bar stock, LS1 is 1 bar =100kpa only.

    you need to switch to a difference map sensor to support high boost reading and to properly tune the vehicle
    Yo are totally right.
    I switched to a 2Bar map sensor and now it is reading Booost

    Thanks.

  17. #17
    Tuning Addict
    Join Date
    Jan 2015
    Location
    Franklin, NC / Gainesville, Ga
    Posts
    6,733
    OK, did further testing and for whatever reason like Ed stated the usual pid - 14.5 doesn't work... Here's what I found to be nearly spot on.

    ([PID.11]*.14503773773020923)-(90*.14503773773020923)

    Just enter your barometric pressure reading where my 90 is. You may have to add or subtract 1, but never the less it should read 0 psi key on engine off.

    Hope this further helps.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC