Log boost with Defi Boost sensor
Aug 7, 2009, 07:02 AM
#20
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The formula in Evoscan for the Defi Map sensor is (x-96)*0.21875 to read in PSI.
If you're not reading 0 with the engine off, you will have to change the 96.
Make the formula for logging boost just x. Log the value with the engine off. This will give you the correct value if 96 doesn't work where you are located.
I have a Defi Racer Series 52mm Boost gauge, I just tapped the signal and connected it to the ECU. I have a JDM 8MR using a 3 plug ECU, so I used pin 92 on the ECU.
Now I can log boost and run the boost gauge with the one MAP sensor
If you're not reading 0 with the engine off, you will have to change the 96.
Make the formula for logging boost just x. Log the value with the engine off. This will give you the correct value if 96 doesn't work where you are located.
I have a Defi Racer Series 52mm Boost gauge, I just tapped the signal and connected it to the ECU. I have a JDM 8MR using a 3 plug ECU, so I used pin 92 on the ECU.
Now I can log boost and run the boost gauge with the one MAP sensor
Aug 17, 2009, 12:50 AM
#22
Evolving Member
Aug 17, 2009, 02:20 AM
#23
Evolving Member
The formula in Evoscan for the Defi Map sensor is (x-96)*0.21875 to read in PSI.
If you're not reading 0 with the engine off, you will have to change the 96.
Make the formula for logging boost just x. Log the value with the engine off. This will give you the correct value if 96 doesn't work where you are located.
I have a Defi Racer Series 52mm Boost gauge, I just tapped the signal and connected it to the ECU. I have a JDM 8MR using a 3 plug ECU, so I used pin 92 on the ECU.
Now I can log boost and run the boost gauge with the one MAP sensor
If you're not reading 0 with the engine off, you will have to change the 96.
Make the formula for logging boost just x. Log the value with the engine off. This will give you the correct value if 96 doesn't work where you are located.
I have a Defi Racer Series 52mm Boost gauge, I just tapped the signal and connected it to the ECU. I have a JDM 8MR using a 3 plug ECU, so I used pin 92 on the ECU.
Now I can log boost and run the boost gauge with the one MAP sensor
I would like to use the above formula to log the boost but in need it to read in Bar, Please advise what changes I have to do to the formula to log in "Bar".
Thx
Aug 17, 2009, 02:29 AM
#24
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I have a HKS RS DB boost gauge and it seems to have the same specs/output voltage etc as the Defi gauge/sensor.
I would like to use the above formula to log the boost but in need it to read in Bar, Please advise what changes I have to do to the formula to log in "Bar".
Thx
I would like to use the above formula to log the boost but in need it to read in Bar, Please advise what changes I have to do to the formula to log in "Bar".
Thx
Aug 17, 2009, 02:48 AM
#25
Evolving Member
Aug 19, 2009, 06:20 AM
#27
Evolving Member
Ok so I have my signal from the HKS boost sensor (5Volt with a 2bar boost gauge) wired into the Ecu on pin 73.
I first log the raw value with the rpm at 0, and I find it shows a value of 57.
I then change the above formula to
(x-57)*0.21875/14.4493.
I do a log with rpm = 0, and it shows me 0 bar on the dot.
I start the car and at idle I am seeing about -.35 to -.4 bar. hich is about right when compared to my gauge.
I then do a 3rd gear log but my logged values are too low.
My gauge shows a spike to 1,6 bar and settles to 1.5 bar before dropping down to 1,45 bar at redline.
Below is what I logged in "Bar" using the formula above...
Code:
TPS RPM JDMMAP 100 2093.75 0.060556567 100 2093.75 0.060556567 100 2125 0.045417425 100 2125 0.075695708 100 2156.25 0.075695708 100 2156.25 0.09083485 100 2187.5 0.105973992 100 2187.5 0.105973992 100 2218.75 0.121113134 100 2250 0.121113134 100 2250 0.121113134 100 2281.25 0.151391417 100 2312.5 0.151391417 100 2343.75 0.166530559 100 2343.75 0.166530559 100 2375 0.1816697 100 2375 0.1816697 100 2406.25 0.196808842 100 2437.5 0.196808842 100 2468.75 0.211947984 100 2468.75 0.227087125 100 2500 0.242226267 100 2531.25 0.242226267 100 2562.5 0.257365409 100 2593.75 0.27250455 100 2625 0.287643692 100 2656.25 0.302782834 100 2687.5 0.317921975 100 2687.5 0.348200259 100 2718.75 0.363339401 100 2750 0.393617684 100 2812.5 0.408756826 100 2812.5 0.439035109 100 2843.75 0.469313392 100 2875 0.499591676 100 2906.25 0.545009101 100 2937.5 0.605565668 100 3000 0.666122234 100 3031.25 0.711539659 100 3062.5 0.756957084 100 3093.75 0.817513651 100 3125 0.878070218 100 3187.5 0.953765926 100 3250 1.059739918 100 3281.25 1.105157343 100 3343.75 1.180853052 100 3406.25 1.211131335 100 3437.5 1.241409618 100 3531.25 1.211131335 100 3593.75 1.180853052 100 3656.25 1.16571391 100 3781.25 1.150574768 100 3843.75 1.150574768 100 3937.5 1.120296485 100 4000 1.120296485 100 4062.5 1.135435627 100 4125 1.120296485 100 4187.5 1.120296485 100 4250 1.135435627 100 4312.5 1.16571391 100 4343.75 1.135435627 100 4437.5 1.16571391 100 4500 1.150574768 100 4562.5 1.135435627 100 4593.75 1.135435627 100 4687.5 1.150574768 100 4718.75 1.150574768 100 4781.25 1.16571391 100 4843.75 1.16571391 100 4906.25 1.16571391 100 4968.75 1.135435627 100 5031.25 1.150574768 100 5062.5 1.135435627 100 5156.25 1.135435627 100 5187.5 1.135435627 100 5312.5 1.135435627 100 5343.75 1.135435627 100 5406.25 1.120296485 100 5437.5 1.105157343 100 5531.25 1.090018202 100 5562.5 1.120296485 100 5625 1.105157343 100 5687.5 1.105157343 100 5750 1.135435627 100 5812.5 1.16571391 100 5843.75 1.150574768 100 5937.5 1.135435627 100 6000 1.120296485 100 6031.25 1.135435627 100 6125 1.135435627 100 6187.5 1.105157343 100 6250 1.105157343 100 6343.75 1.07487906 100 6375 1.07487906 100 6437.5 1.07487906 100 6468.75 1.044600777 100 6531.25 1.044600777 100 6593.75 1.029461635 100 6656.25 1.044600777 100 6718.75 1.014322493 100 6750 0.999183351 100 6812.5 0.999183351 100 6843.75 0.999183351 100 6906.25 0.98404421 100 6968.75 0.999183351 100 7000 0.968905068 100 7093.75 0.98404421 100 7156.25 0.953765926
Code:
TPS RPM JDMMAP 100 2125 58 100 2093.75 59 100 2156.25 60 100 2156.25 59 100 2125 60 100 2187.5 61 100 2187.5 61 100 2187.5 62 100 2250 63 100 2250 62 100 2250 62 100 2281.25 63 100 2281.25 64 100 2281.25 64 100 2312.5 64 100 2343.75 64 100 2343.75 64 100 2375 66 100 2406.25 65 100 2406.25 67 100 2437.5 68 100 2437.5 68 100 2468.75 68 100 2500 68 100 2500 69 100 2531.25 69 100 2562.5 70 100 2562.5 71 100 2593.75 72 100 2625 73 100 2625 73 100 2656.25 74 100 2687.5 74 100 2687.5 75 100 2718.75 76 100 2750 77 100 2750 78 100 2781.25 79 100 2812.5 79 100 2812.5 81 100 2843.75 82 100 2875 83 100 2875 84 100 2906.25 87 100 2937.5 88 100 2968.75 91 100 3000 94 100 3031.25 96 100 3062.5 99 100 3093.75 101 100 3125 103 100 3156.25 108 100 3218.75 112 100 3250 116 100 3312.5 120 100 3343.75 125 100 3375 131 100 3437.5 134 100 3500 135 100 3531.25 134 100 3593.75 136 100 3656.25 133 100 3718.75 135 100 3781.25 133 100 3812.5 133 100 3906.25 134 100 3906.25 133 100 4000 132 100 4062.5 133 100 4093.75 132 100 4156.25 132 100 4187.5 132 100 4218.75 134 100 4281.25 133 100 4343.75 135 100 4375 132 100 4437.5 131 100 4500 133 100 4562.5 131 100 4593.75 133 100 4656.25 134 100 4687.5 133 100 4781.25 132 100 4812.5 131 100 4875 132 100 4937.5 132 100 4968.75 132 100 5031.25 132 100 5093.75 132 100 5187.5 132 100 5218.75 132 100 5250 130 100 5312.5 131 100 5343.75 131 100 5406.25 131 100 5468.75 129 100 5531.25 131 100 5562.5 131 100 5625 130 100 5687.5 131 100 5718.75 133 100 5781.25 131 100 5843.75 131 100 5875 132 100 5937.5 132 100 6000 133 100 6031.25 132 100 6093.75 132 100 6125 130 100 6187.5 129 100 6218.75 130 100 6250 128 100 6281.25 129 100 6343.75 127 100 6375 129 100 6406.25 126 100 6437.5 126 100 6468.75 125 100 6500 127 100 6562.5 126 100 6593.75 124 100 6625 124 100 6687.5 123 100 6687.5 123 100 6750 122 100 6781.25 123 100 6812.5 121 100 6843.75 123 100 6875 122 100 6906.25 121 100 6937.5 121 100 7000 122 100 7031.25 119 100 7062.5 120 100 7093.75 121 100 7125 119
I am at 5600 feet above sea level and my Baro on the car shows 0,84 Bar, is there an offset of some sort I need to add in the formula to compensate?
Thx..
Aug 19, 2009, 07:36 AM
#28
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Yes
the formula is for ca. 1bar, to compensate for your value you have to add the difference, so
value_new = value_original_formula + (1-0.84).
Anyway this formula yields for a Defi sensor. I'm not sure that the scaling is the same for the HKS.
The best is if you log the raw signal and you compare it with the reading of the gauge. Try 2 or 3 points where to pressure is quite contant (e.g. full throttle in 6th gear @ 2500rpm + idle)
the formula is for ca. 1bar, to compensate for your value you have to add the difference, so
value_new = value_original_formula + (1-0.84).
Anyway this formula yields for a Defi sensor. I'm not sure that the scaling is the same for the HKS.
The best is if you log the raw signal and you compare it with the reading of the gauge. Try 2 or 3 points where to pressure is quite contant (e.g. full throttle in 6th gear @ 2500rpm + idle)
Last edited by mlocatel; Aug 19, 2009 at 07:39 AM.
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