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2-15-2007
David Mann
Welcome to the first installation of the SRD Power Pages Project Car. We will be using a 2006 Infiniti G35 Coupe with 10,000
miles and we will dyno every single performance modification we put on the car. It is our goal to bring you real world results
for the products we sell. There are a lot of choices out there and it makes sense to buy the best product you can get for your
hard earned dollars.
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For our first modification, we will be installing a new air intake since this is where most consumers will likely start out on their
modification list. We have selected the Fujita Short Ram intake and the Injen Cold Air intake for this test. The Fujita system sells
for $220 and the Injen sells for $280 and both can be found in our online store.
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Above we see the engine bay with the stock intake installed. As with any stock setup it has several baffles to decrease the noise
level and give the driver a quieter ride. Unfortunately those sound baffles can disrupt intake air flow and can rob the motor of
its full power potential. But here at SRD we aren't concerned with quiet rides! We love the sound of the VQ35 and we want to let
it breathe!
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It says Power Duct so it must be good right?
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Well they definately look nicer than the stock intake but let's find out about that Dyno Proven Performance shall we?
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We took the car down to our friends at Xact dyno in Tempe to conduct our test because they use a Dynapack dyno which is a hub mounted
dyno that will allow us to measure actual torque and horsepower numbers. This will also be very useful when we install our UTEC in the car
for tuning purposes.
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So we got the car all bolted onto the dyno and ran it a few times to get a nice baseline of 241 whp and 226 ft-lbs of torque.
Not too bad for 1000 feet above sea level.
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Now that we have a baseline, it's time to pull the old intake out and install the Fujita Short Ram. Fujita claims 10 whp with their
intake system, but we're a bit skeptical of those claims. Only the dyno will tell for sure.
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Installation of the Fujita Short Ram is relatively easy and now that we've got it installed, it's time to put it to the test. Tim powers up the dyno and we see what it's got to offer.
The results are nothing less that utterly dissapointing.
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Overall the Fujita intake seems to have created a loss in power! Not exactly living up to the 10 whp claim, but it definately
sounded nice. The car actually seemed to run slightly richer with the Fujita installed and intake air temps were up significantly
over stock. Engine acceleration was greatly improved over stock though as can be seen in the comparison chart later in this write up.
Let's see what the Injen can do.
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Installation of the Injen takes slightly longer than the Fujita because it is a cold air intake, but it's not difficult when you have
done as many as we have here at SRD.
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So now that we've got it installed it's time to run it on the dyno. We're crossing our fingers that it nets better results than
we saw with the Fujita system. Unfortunately our finger crossing efforts were in vain as the Injen actually lost almost 9 ft-lbs
of torque in the lower end and midrange and stayed pretty close to stock up top. Not exactly the results we were hoping for here
either. However, taking a look at the Air Fuel Ratio indicates that the Injen system has make the car much leaner which should
result in an increase in power and yet the dyno results show otherwise. What's this mean? Well, the most likely answer is that
the computer is recognizing the leaner condition and pulling some timing to accomodate, thus reducing the motors horsepower output.
Looking at the engine acceleration comparison we can see that the Injen also increases over stock, though not quite as much as the
Fujita.
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Above we can see the relative ambient temperatures for all three dyno pulls for comparison. We kept the intake temperatures within
two degrees of each other to ensure that the motor wouldn't fall victim to heat soak and alter our results.
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Looking at the Air Fuel Ratio comparison shows us that the Injen seems to lean the vehicle out the most, which in turn gives it the
most potential for making power of the three we've tested here. If only we could get the computer to stop pulling timing to make up
for the change in AFR we should see a healthy increase in power. Looks like we'll need a UTEC installed for our next session.
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This comparison shows us relative engine acceleration times. We can clearly see that the Fujita gets the motor in the higher RPM
range quicker, which is why most people's "Butt Dyno" tells them it is making more power and the car feels faster.
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Fujita vs Injen
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The Injen was left on the vehicle because it illustrated the most "symptoms" of making more power. Once the ECU has truly had time
to learn the new setup we believe a nice horsepower increase will be realized.
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