Owner: Alan Viado
Dynamometer model: Dynamic Test System Australia
DYNO 1: Baseline
Air temp @ 60.4 Degrees Fahrenheit
Peak.HP 192.0
Peak.Tq 177.2
Baseline Horsepower: 192.0
Baseline Torque: 177.2
Pros
Given this is our third Power Page for a WRX, we have been able to find out that with the many different routes you can follow when building your WRX, the end result can always be different. This time around we were able to add quick power by jumping straight into the Invidia header which eliminated the random misfire sound from the WRX.
Cons
We screwed up last time around and quoted the wrong pricing for the Invidia Downpipe. The real price is $399.99. Invidia stainless exhaust system goes for $799.99. Other then that for this second time around our power was back to the same level as last time.
Dyno Notes
The torque and horsepower reads high at 3500 rpm which was due to a load rpm of 25 mph. True torque reading came out to 177.2 @ 4300 rpm.
DYNO 2: SPI Motorsports VF34 Turbo
Air temp @ 63.6 Degrees Fahrenheit
Temperature difference from previous run 3.2 Degrees Fahrenheit
Peak.HP 245.9
Peak.Tq 182.3
2000 to 3500 HP Range: -15 to 5
2000 to 3500 TQ Range: -20 to 6
3500 to 5500 HP Range: -5 to 5
3500 to 5500 TQ Range: 0 to 7
5500 to redline HP Range: 10 to 50
5500 to redline TQ Range: 4 to 50
Peak Horsepower: 245.9
Peak Torque: 182.3
Pros
The turbo is a direct replacement so there is no need for modification to install the new unit, making the install much easier. The turbo also comes with new oil and water fittings.
Cons
The turbo doesn't come with new gaskets for the turbo to up-pipe or turbo to downpipe.
Parts include:
Turbocharger, water and oil fittings.
Tools required for install:
10-, 12-, 14mm sockets, 14mm wrench, slotted screwdriver and needle nose pliers.
Dyno Notes
Power in the low to mid range was sacrificed for more top end power so in first gear the turbo takes much longer to spool up. Considering that our in between shifts do not go below 4500 rpm and this turbo hits max boost at 3800, the horsepower tradeout was well worth it. HP and TQ are corrected at the flywheel.
Install time: 2-2.5 hours
DYNO 3: A'PEXi AVCR
Air temp @ 69.3 Degrees Fahrenheit
Temperature difference from previous run 5.7 Degrees Fahrenheit
Peak.HP 279.3
Peak.Tq 238.8
2000 to 3500 HP Range: -5 to 0
2000 to 3500 TQ Range: -4 to 0
3500 to 5500 HP Range: -6 to 10
3500 to 5500 TQ Range: -6 to 14
5500 to redline HP Range: 10 to 60
5500 to redline TQ Range: 14 to 56
Peak Horsepower: 279.3
Peak Torque: 238.8
Pros
The AVC-R is not only able to control max boost pressure, it is also able to control a turbo's spool time. With the proper programming the boost controller can also stage boost by gear.
Cons
The controller is easy to install but programming can take some time. However, there is a basic default mod that lets you use the controller as a normal boost controller without all the options.
Parts include:
Boost solenoid, boost controller, vacuum lines, vacuum tees, wiring harness, mounting brackets, double sided tape.
Tools required for install:
10mm socket, wire crimper, wire stripper and needle nose pliers
Dyno Notes
It took some getting used to, but we were able to take full advantage of the controllers boost duty cycle in the low- to mid-rpm area. This allowed us to get the VF34 turbo to spool up a little quicker than normal. HP and TQ are corrected at the flywheel.
Install time: 1.5 hours
DYNO 4: A'PEXi S-AFC ii
Air temp @ 62.5 Degrees Fahrenheit
Temperature difference from previous run -6.8 Degrees Fahrenheit
Peak.HP 308.1
Peak.Tq 234.6
2000 to 3500 HP Range: zero
2000 to 3500 TQ Range: zero
3500 to 5500 HP Range: 2 to -9
3500 to 5500 TQ Range: 2 to -10
5500 to redline HP Range: -12 to 14
5500 to redline TQ Range: -8 to 58
Peak Horsepower: 308.1
Peak Torque: 234.6
Pros
This fuel computer has been a valuable asset to Power Pages, and now that it has been revamped too hold two maps and more NE points the S-AFC is that much better. Since the instructions come with wiring diagrams for most popular imports install time is very short.
Cons
Programming the new unit takes just as long as the old unit but there are a few new functions to learn. After some time playing with the piggyback unit I'm sure program time will become much shorter. A little known fact is that this computer also changes timing unintentionally. While the changes are minimal it does have some effect on horsepower whether it is for plus or minus power.
Parts include:
Fuel computer, wiring harness, connectors, mounting bracket, and double sided tape.
Tools required for install:
10mm socket, 6-inch extension, wire stripper and wire crimper.
Dyno Notes
Tuning the fuel computer has become second nature to most shops and on this particular one we were lucky enough to make minor changes to make a lot of power. Our only major sacrifice was the lost in mid range power. We did lose power in the mid but made it up in the top end. Depending on the type of racing you do, you can take the power either way, whether it is drag racing or road racing. Horsepower and Torque are corrected at the wheels.
Install time: 1 hour
| Parts Cost |
| VF34 Turbo | $1450.00 |
| A'PEXi AVC-R | $639.00 |
| A'PEXi S-AFC II | $439.00 |
| MSRP total | $2528.00 |
| Performance Chart |
| | HP Level | HP+ | TQ Level | TQ+ |
| Baseline | 192.0 | * | 177.2 | * |
| VF34 Turbo | 245.9 | 53.9 | 182.3 | 5.1 |
| APEXi AVC-R | 279.3 | 33.4 | 238.8 | 56.5 |
| APEXi S-AFC II | 308.1 | 28.8 | 234.6 | -4.2 |
| Final | 308.1 | 116.1 | 234.6 | 57.4 |
Conclusion
By simply added a mere three parts our power level went up an additional 116 horsepower. Of course, the turbo played a very important role, the fact is it take the two other parts to make the most out of the turbo. Tuning plays an important role when applying parts on a vehicle and with the cars today, knowing what will or will not work on the car is extremely important.