run your car with open intakes - no afm necessary! no more running rich from boost leaks or blow off valves and no intake restriction to boot. the VPC measures pressure from your plenum, converts it to an AFM voltage and sends that to the standard ECU. MAP sensor conversion with standard ECU. 1) run wires and sensors into car (labelled for you, super easy) 2) tee off MAP sensor to manifold 3) throw AFM in the bin and fit twin filters under the headlights it's that simple. worked wonders on my car but since I'm going to a stand alone ECU no longer necessary. $320 brand new pair of OEM bosche O2 sensors. $120 posted. -A
What is the max boost this can be run at? I'm thinking of using this for my twin turbo conversion. What psi is the limit of the map sensor? Abraham
O2 sensors sold I believe 21 PSI. When we had my car on the dyno the operator reckoned it was 14, but we pushed it well past that. Considering the amount that they ****ed up on the day I'm not really giving the benefit of the doubt, and everywhere I read it's 21 PSI.
If it's a one bar sensor it's 14.7psi. Never heard of a 1.5 bar sensor although the f con uses a 1.7 bar Denso devise perhaps this is what you're thinking of? Do you have a part number for your sensor?
Yes I do, it's a Denso 949940-6110. According to the two below sources this is known as a HKS Sensor 1, and is 1.7 BAR (24 PSI) @ 4.5 volts - the same one you're thinking of Rob. I meant to put these in the OP but forgot, lol. http://1jzmerc.com/hks-faq/hardware/ http://fc-hako.com/pfc/tuning-guide/map-sensors
Just so everyone is clear a 1 bar sensor is only good for atmo pressure a 2 bay sensor is good for 1 bar of boost. Its measured in total pressure not positive pressure. Although it is like an afm just because its rated at 1 bar doesnt mean you cant push past it. It just means the tune wont be optimal.
My skeptical senses are tingling. I had it higher than that on the street. edit: I work for a HKS dealer. I'll get in touch with them and clarify what pressure exactly the sensors are rated to.
The HKS VPC is a fuel management device that is designed to physically and electronically replace the OEM air metering devices for improved air flow and precise fuel delivery control. OEM air metering devices, such as Air Flow Meters (Flapper/Plunger types) and Air Mass Sensors (Hot wire / Karmen Vortex types) measure the amount of air flowing into the intake manifold in order to properly control fuel enrichment levels. Aside from offering no adjustment or reprogramming options to take advantage of dramatically higher amounts of airflow or larger fuel injectors, the OEM air meter also represents a significant restriction to the intake system. To overcome this restriction, the VPC physically removes the OEM air meter to dramatically improve airflow capacity and converts the system to what is referred to as a speed density system. By utilizing a 16-bit central processing unit, the VPC reads it?s own intake air temperature sensor and absolute pressure transducer (B-MAP sensor) signals and then converts those signals to one that is recognizable by the factory ECU. The VPC also incorporates the ability to upgrade the internal application specific ROM program to correctly compensate and take full advantage of larger, Higher flowing, HKS fuel injectors and/or the greater air flow characteristics of larger turbos. Each application specific ROM program is calibrated for a specific injector size, fuel pumps, camshafts, and/or turbos, ensuring that the correct injector pulse width is calculated to prevent driveability and reliability problems. Since the VPC ?piggy-backs? the factory ECU, all factory systems are still intact and operational. Fine tuning of fuel curves can be further achieved by integrating the plug-in GCC or by wiring in a Super AFR.
The unit is chipped for standard 370cc injectors - VG30DETT the chip is labelled. That's only really relevant if you plan to tune using this device. Totally possible, but I prefer Nistune. With Nistune programmed for my 550cc injectors and the standard chip in the VPC the car ran fine.
I spoke to HKS today. Their sensors are pressure rated above atmosphere, meaning 1.7 on top of atmosphere. This means the VPC is good for up to 24 PSI of boost. I knew "that's retarded" wasn't springing to mind for no reason...
