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Discussion Starter #1
Just wondering about the performance gains from the vpc... i hear alot about it but dont know alot..... just that it somehow replaces the maf sensor.... is it bigger or does the sensor leave and the car is ran off the o2s whats up>? does it help a stock twin car with 420rwhp.... thanxKevin..
 

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I think the VPC will definitely help, whether or not you get a a great deal of HP pick up from just removing the MAF, who knows? But Maury (Spool) installed a VPC and GCC on his 97 Auto and with everything set at zero, he dyno'd 380rwhp, after tuning, the car made 420rwhp @ 1.4bar 40 HP to the wheels isn't too bad in my opinion.
 

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Below is from HKS site. The power is different from car to car.

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.
 

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Pretty much the VPC lets you move on to bigger and better things like a single turbo.
 

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It will give you more on the top end.
From 5800,6k RPM to redline will have more power.
Better area under the curve:))

Tommy
T-78
 

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Exactly. I was able to hold about 400 RWHP to redline whereas many MAF BPU's are at 350 RWHP at redline. More area under the curve...it's a good thing!!!

anthracite said:
It will give you more on the top end.
From 5800,6k RPM to redline will have more power.
Better area under the curve:))

Tommy
T-78
 

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A tuned AFC will also be able to allow MAF Supra to hold over 400 to redline as well without use of a vpc. A Vpc will enhance this power. So afc/gcc and vpc como will utulize the most power when tuned.
 

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Now, if you look at these runs here...this is after I installed the VPC. These runs were with NO AFC and STOCK EXHAUST and it still picked up horsepower. I hope you can see the difference on these dyno sheets. It is easier when you own the car and you know EXACTLY what is going on. If you have any questions just ask.

Hope this helps.
 

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BTW...on those two runs, the 405/438 with Greddy SP and no VPC was on a 60 degree day....the 420/456 with stock exhaust and VPC was on a 95 degree day. Just want to get all the facts out and show how much a VPC really does help.

Don't only look at the peak numbers either, the whole curve is improved. The area under the curve is what gets the good times at the track.:)
 
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