will15 Posted September 5, 2018 Share Posted September 5, 2018 Just got a 3 bar bosch map sensor part number 0 281 002 845 how do I go about scaling it. only info I have is 11kpa 0.25v and 307kpa 4.75v Quote Link to comment Share on other sites More sharing options...
Darryl@pcmtec Posted September 5, 2018 Share Posted September 5, 2018 (edited) Iff that data is correct then that can be done. First convert the kPa to inHg by multiplying it by 0.2953 11 kPa= 3.4283 inHg, 307 kPa= 90.657 inHg Ford uses MAP = Volts * Slope - Offset. so 90.657 = 4.75 * Slope - Offset (1) and 3.483 = 0.25 * Slope - Offset (2) Subtract equation (2) from equation (1) 87.174 = 4.5 Slope 19.372 = Slope. Substituting back gives 90.657 = 4.75 * 19.372 - Offset -1.36 = Offset, => Offset = 1.36 Edited September 7, 2018 by Darryl@pcmtec Change KPH to KPA 1 Quote Link to comment Share on other sites More sharing options...
will15 Posted September 5, 2018 Author Share Posted September 5, 2018 ok so basically if a put 19.372 into auf0037 and 1.36 into auf0038 and the valves I gave are correct it should work I don't need to change any other max or min values?. Quote Link to comment Share on other sites More sharing options...
Darryl@pcmtec Posted September 5, 2018 Share Posted September 5, 2018 Correct. Quote Link to comment Share on other sites More sharing options...
Sam Posted October 6, 2020 Share Posted October 6, 2020 @Darryl@pcmtec just having a quick look over this and correct me if I'm wrong but I believe you've put 11kpa= 3.4283, when it should be 3.2483? Which would then change the slope to 19.42 and offset to 1.61?? 1 Quote Link to comment Share on other sites More sharing options...
Darryl@pcmtec Posted October 7, 2020 Share Posted October 7, 2020 Sam, I just rechecked and 11 kpa is 3.2483 like you said. Pressure differential would be 87.409 => Slope 19.424, back feeding and Offset => 1.607 Good spotting. Quote Link to comment Share on other sites More sharing options...
JMSMotorsport Posted October 9, 2022 Share Posted October 9, 2022 On 10/7/2020 at 12:36 PM, Darryl@pcmtec said: Sam, I just rechecked and 11 kpa is 3.2483 like you said. Pressure differential would be 87.409 => Slope 19.424, back feeding and Offset => 1.607 Good spotting. Just Confirming the units is inHg and that auF0037 is 19.424 & auF0038 is 1.607 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted October 9, 2022 Share Posted October 9, 2022 18 hours ago, JMSMotorsport said: Just Confirming the units is inHg and that auF0037 is 19.424 & auF0038 is 1.607 The standard units are inHG. Turbo and non turbo offsets are inverted. One is negative, I don't know why Ford did that but make sure you use the correct value if you are using turbo logic enabled or not. Quote Link to comment Share on other sites More sharing options...
JMSMotorsport Posted October 10, 2022 Share Posted October 10, 2022 53 minutes ago, Roland@pcmtec said: The standard units are inHG. Turbo and non turbo offsets are inverted. One is negative, I don't know why Ford did that but make sure you use the correct value if you are using turbo logic enabled or not. Factory BF Mk2 Turbo Quote Link to comment Share on other sites More sharing options...
Hookey Posted January 24, 2023 Share Posted January 24, 2023 Anyone confirmed these settings work?. Seems like a simpler process than using the change over logic. Quote Link to comment Share on other sites More sharing options...
Geesix Posted May 11, 2023 Share Posted May 11, 2023 guys im not wuite understanding your symbles here im trying to set up a 4 bar boost sensor i think the black text is right just not sure what to do with the red text First convert the kPa to inHg by multiplying it by 0.2953 24 kPa= 7.0871 inHg, 400 kPa= 118.1199 inHg Ford uses MAP = Volts * Slope - Offset. so 118.1199 = 4.75 * Slope - Offset (1) and 7.0871 = 0.25 * Slope - Offset (2) Subtract equation (2) from equation (1) 111.6928 = 4.5 Slope 24.8206 = Slope. Substituting back gives 118.1199 = 4.75 * 24.8206 - Offset -1.36 = Offset, => Offset = 1.36 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted May 12, 2023 Share Posted May 12, 2023 (edited) * means multiply, / means divide, - means minus, + means add, = means equals. The arrow thing can get in the bin, you could just as well put the phrase "Offset = 1.36" on the next line and not use the arrow. 12 hours ago, Geesix said: 118.1199 = 4.75 * 24.8206 - Offset To calculate the offset from this equation you do this. 4.75 * 24.8206 = 117.89785 + offset 118.1199 - 117.89785 = offset offset = 0.22205 I didn't go through and check all your maths etc, I just showed you how to do the part you are asking about. Edited May 12, 2023 by Puffwagon Quote Link to comment Share on other sites More sharing options...
Geesix Posted May 12, 2023 Share Posted May 12, 2023 2 minutes ago, Puffwagon said: * means multiply, / means divide, - means minus, + means add, = means equals. The arrow thing can get in the bin, you could just as well put the phrase "Offset = 1.36" on the next line and not use the arrow. To calculate the offset you do this. 4.75 * 24.8206 = 117.89785 + offset 118.1199 - 117.89785 = offset offset = 0.22205 I didn't go through and check all your maths etc, I just showed you how to do the part you are asking about. thanks puff it was the arrow thing that ws getting me confused cheers Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted May 12, 2023 Share Posted May 12, 2023 Haha I thought it might have been that. Quote Link to comment Share on other sites More sharing options...
Hookey Posted May 12, 2023 Share Posted May 12, 2023 For those that dont know the arrow above means "logically implies that". Basic year 11 maths. You use it when showing your working with maths 1 Quote Link to comment Share on other sites More sharing options...
Geesix Posted May 12, 2023 Share Posted May 12, 2023 1 minute ago, Hookey said: For those that dont know the arrow above means "logically implies that". Basic year 11 maths. You use it when showing your working with maths sorry i didnt go to year 11 lol and if i did it was 30 year ago Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted May 12, 2023 Share Posted May 12, 2023 12 minutes ago, Hookey said: For those that dont know the arrow above means "logically implies that". Basic year 11 maths. You use it when showing your working with maths Haha you learn something new every day. I only learnt that fridge seals have a magnet in them a couple of weeks ago when I fixed my fridge. 42 years young here 😉 1 Quote Link to comment Share on other sites More sharing options...
Geesix Posted May 12, 2023 Share Posted May 12, 2023 2 minutes ago, Puffwagon said: Haha you learn something new every day. I only learnt that fridge seals have a magnet in them a couple of weeks ago when I fixed my fridge. 42 years young here 😉 lol 🤣 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted May 16, 2023 Share Posted May 16, 2023 On 5/12/2023 at 10:01 AM, Hookey said: For those that dont know the arrow above means "logically implies that". Basic year 11 maths. You use it when showing your working with maths I did an engineering degree and didn't even know that. Either that or I've forgotten more than I realise. Quote Link to comment Share on other sites More sharing options...
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