ECU not seeing correct boost level?
#1
ECU not seeing correct boost level?
It's tough to know exactly how much boost the ecu is seeing, because my analog boost guage always seems to give me a different reading than the pressure level on the SAFC. The SAFC is only in my car because i'm too lazy to take it out; I am using Uberdata. The SAFC settings are all on 0%. My question is, if the boost guage is displaying 10 psi, and the SAFC is only at about 0.5 bar (7.4 psi I guess), is the ecu only seeing 7.4 psi of boost, or is the SAFC just interpreting the MAP sensor voltage incorrectly?
#2
Re:ECU not seeing correct boost level?
when your at ambient, is your analog gauge right on 0?
I have one of those Autometer Ultra Lites, and it sits at about 2lbs at ambient.
Maybe your gauge is off? ..I wouldn't lean towards the SAFC being too off unless you set it correctly(?).
I have one of those Autometer Ultra Lites, and it sits at about 2lbs at ambient.
Maybe your gauge is off? ..I wouldn't lean towards the SAFC being too off unless you set it correctly(?).
#3
Re:ECU not seeing correct boost level?
Originally Posted by TurboEF9
when your at ambient, is your analog gauge right on 0?
#4
Re:ECU not seeing correct boost level?
Honda MAP sensors are absolute aren't they not?
most boost gauges are relative so the boost gauge may be seeing 10psi of preasure difference from the manifold to ambient while the ecu is only seeing 7.4psi above sea level?
correct me if i'm wrong
most boost gauges are relative so the boost gauge may be seeing 10psi of preasure difference from the manifold to ambient while the ecu is only seeing 7.4psi above sea level?
correct me if i'm wrong
#5
Re:ECU not seeing correct boost level?
Originally Posted by ComputerJLT
Honda MAP sensors are absolute aren't they not?
most boost gauges are relative so the boost gauge may be seeing 10psi of preasure difference from the manifold to ambient while the ecu is only seeing 7.4psi above sea level?
correct me if i'm wrong
most boost gauges are relative so the boost gauge may be seeing 10psi of preasure difference from the manifold to ambient while the ecu is only seeing 7.4psi above sea level?
correct me if i'm wrong
#8
Re:ECU not seeing correct boost level?
Originally Posted by Will
Originally Posted by ComputerJLT
Honda MAP sensors are absolute aren't they not?
most boost gauges are relative so the boost gauge may be seeing 10psi of preasure difference from the manifold to ambient while the ecu is only seeing 7.4psi above sea level?
correct me if i'm wrong
most boost gauges are relative so the boost gauge may be seeing 10psi of preasure difference from the manifold to ambient while the ecu is only seeing 7.4psi above sea level?
correct me if i'm wrong
if the map sensor is absolute then yes. it will see the absolute pressure inside the manifold as it would be at sea level. makes sense to me but i really have no idea if the map sensor is relative or absolute.
but yeah; the general rule of thumb is that cheap boost gauges aren't verry accurate.
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