JeffHarper
New Member
Has anyone ever tried a HKS VPC to improve the air flow control?
VPC (Vein Pressure Converter)
This device allows the removal of the stock air-mass sensor. It simulates the signal that the air-mass sensor normally supplies the computer. It uses standard speed-density measurements to determine (estimate) the air mass being consumed. Speed-density works by factoring together engine RPM and manifold pressure. Barometric pressure and ambient air temperature also also fudged into the final calculation. The calculations are highly dependent on the volumetric efficiency of the motor. For this reason, the VPC needs to be "tuned" differently for engines that have different levels of modifications. Many people report that low speed operation and idle quality is adversely effected. While this is not always the case, it is an indication of the fact that this device isn't a "plug n' play" solution. Once the VPC is tuned to provide a reasonable facsimile of the signals that the stock Airflow Sensor previously provided, the major advantage of the VPC becomes apparent. The elimination of the stock (restrictive) air-mass sensor increases incoming airflow capacity substantially. It is credited with providing very substantial horsepower increases mainly by virtue of the reduced intake restriction. Some advantage is also attributable to the fact that the air-fuel mixture can be easily changed with the front panel controls. Supposedly, the output signals from the VPC are held within a range that won't cause the ECU to fall into a fuel-cutoff mode. (A few people report that fuel cut problems still exist however - despite their best efforts to cure them)
http://www.rit.edu/~sjb2096/dsminfo_pages/hks_vpc_manual.pdf
http://www.rit.edu/~sjb2096/dsminfo_pages/vpc-gcc.html
http://www.taboospeedshop.com/VPC.htm
It sure seems to have some potential.
VPC (Vein Pressure Converter)
This device allows the removal of the stock air-mass sensor. It simulates the signal that the air-mass sensor normally supplies the computer. It uses standard speed-density measurements to determine (estimate) the air mass being consumed. Speed-density works by factoring together engine RPM and manifold pressure. Barometric pressure and ambient air temperature also also fudged into the final calculation. The calculations are highly dependent on the volumetric efficiency of the motor. For this reason, the VPC needs to be "tuned" differently for engines that have different levels of modifications. Many people report that low speed operation and idle quality is adversely effected. While this is not always the case, it is an indication of the fact that this device isn't a "plug n' play" solution. Once the VPC is tuned to provide a reasonable facsimile of the signals that the stock Airflow Sensor previously provided, the major advantage of the VPC becomes apparent. The elimination of the stock (restrictive) air-mass sensor increases incoming airflow capacity substantially. It is credited with providing very substantial horsepower increases mainly by virtue of the reduced intake restriction. Some advantage is also attributable to the fact that the air-fuel mixture can be easily changed with the front panel controls. Supposedly, the output signals from the VPC are held within a range that won't cause the ECU to fall into a fuel-cutoff mode. (A few people report that fuel cut problems still exist however - despite their best efforts to cure them)
http://www.rit.edu/~sjb2096/dsminfo_pages/hks_vpc_manual.pdf
http://www.rit.edu/~sjb2096/dsminfo_pages/vpc-gcc.html
http://www.taboospeedshop.com/VPC.htm
It sure seems to have some potential.