i have electric Blitz boost gauge and my commander shows different boost/vacuum readings. actually PFC reads about 50~100mmHg higher than what the gauge reads.

for example, at idle, PFC reads about -490mmHg of vacuum where Blitz reads -390mmHg, and when boosting, Blitz - 0.80kg PFC - 0.69kg.
which one should i believe?

and these are somewhat minor questions id like to ask...
-when i turn off the car, PFC still reads -54mmHg of vacuum. sounds right?

-what kind of reading should i get for Injector Duty at idle (stock 550s, 850s)?

-when cruising, letting off the gas pedal. all of sudden Injector Duty reads 0%. ???

thanks for any input~

actually there are more little problems which i may post them in the future, but i think they are related with the major problem im fixing now (fuel leak - one of pri. Inj).

 

Wow you must have a really good engine pulling that much vacume. anyway I have yet to see a boost gauge that reads the same as the PFC, but I always go with what the PFC says because it is the brain that is controlling the engine, even if it is wrong...

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and these are somewhat minor questions id like to ask...
-when i turn off the car, PFC still reads -54mmHg of vacuum. sounds right?

This is the atmospheric pressure where you live... Since you are above sea level you have less than the 14.7 lbs per sq inch air pressure... This will also change as the weather changes..

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-what kind of reading should i get for Injector Duty at idle (stock 550s, 850s)?

Probably around 750-85% under full boost

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-when cruising, letting off the gas pedal. all of sudden Injector Duty reads 0%. ???

This is normal.. It's called lean burn during deceleration, when you let off the gas the engine will cut fuel at a certin throttle position since the throttle plates are closed and there is minimal air going to the engine, this keeps your car from flooding out..

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thanks for any input~

Your Welcome,
Chris

 

thanks for the great info Chris!

oh one more thing, at idle, what range of Injector Duty should i get?

 

I've never had stock injectors in my car with the power FC, but I would think around 4 or 5%...

Chris

 

Yeah I get about 4 or 5% at idle