EFI Source 3 bar map values
EFI Source 3 bar map values Going over my tune last night before the first start up and came across the map scaling. I'm using the 3 bar map from EFI Source and tried to find info on the values used for scaling. I've seen some say 0-315 and I've also seen 0-305 on their site. Would someone be willing to share what values they used who's used it with the Holley EFI? Thanks.
Alright, just tested the EFI Source 3 bar map sensor with a mytivac and a pressure regualtor with a gauge. As far as vacuum goes, the sensor was right on. However, when pressure was applied, the sensor was off by about .75 to 1 psi in lower ranges (below 10 psi) and off roughly 1.5 to 2.0 psi up high (over 25 psi). In all cases, the sensor was showing lower than the actual pressure applied. After adjusting the voltages in the software, the sensor is now accurate and the repeatibility is there in both the high and low ranges. Just thought I'd what I found.
Edit; this information was found when using the voltages or the "custom" 3 bar map in the Holley system.
Edit; this information was found when using the voltages or the "custom" 3 bar map in the Holley system.
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From: Norn Iron
Even with a genuine sensor, it's best to test so it reads as you expect.
but with a chinese sensor, it's almost essential.
Ultimately it doesnt really matter...but to do it right, you want to know all the numbers things are telling you are correct too.
but with a chinese sensor, it's almost essential.
Ultimately it doesnt really matter...but to do it right, you want to know all the numbers things are telling you are correct too.
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Verdad Gallardo It's still 0-315, I'll get you the voltages used to get it to read correctly under pressure and vacuum when I fire my laptop back up.
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From: Norn Iron
Those readings may apply to your setup....again, given inconsistency with some chinese sensors, there's no guarantee all other sensors will read the same, although they should be close.
Agreed in every respect. It's easy enough to check any sensor and adjust it accordingly of your system allows.
Agreed in every respect. It's easy enough to check any sensor and adjust it accordingly if your system allows.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
Different ecu's allow you to scale sensors in different ways. Some simple and straightforward...others in really weird ways. End result will be the same which is what matters.
Easiest and most sensible is just a 0-5v table where you enter the pressure values that correspond with voltages throughout that table, with as many data points as necessary. Although for a linear sensor only 2 should really be needed. Not all sensors do behave linear though, even if they should.