pressure sensor
01-27-04, 11:57 PM
#5
The n318 is for turbo cars, and is calibrated for a range of vacuum up to and including atmospheric, and then up to about 15psi. Voltage range of 0-5v or so.
The n326 is for NA cars, and is calibrates for a range of vacuum up to and including atmospheric and no farther. Voltage range, still, of 0=5v.
So, what does that mean? At, say, 3.5vdc, the turbo sensor may be indicating 6psi. However, since the NA sensor uses the same voltage range but a much different pressure scale, it's 3.5v may indicate well below atmospheric, still in vacuum.
What this means is that, in a car with a turbo ecu, and an NA pressure sensor, going up to atmospheric in reality makes the computer think the car is boosting 8psi or more. This means you could hit fuel cut without even boosting, or could be retarding timing while still in vacuum.
Bottom line, it'll screw things up, don't do it.
The n326 is for NA cars, and is calibrates for a range of vacuum up to and including atmospheric and no farther. Voltage range, still, of 0=5v.
So, what does that mean? At, say, 3.5vdc, the turbo sensor may be indicating 6psi. However, since the NA sensor uses the same voltage range but a much different pressure scale, it's 3.5v may indicate well below atmospheric, still in vacuum.
What this means is that, in a car with a turbo ecu, and an NA pressure sensor, going up to atmospheric in reality makes the computer think the car is boosting 8psi or more. This means you could hit fuel cut without even boosting, or could be retarding timing while still in vacuum.
Bottom line, it'll screw things up, don't do it.
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