more proof that fujita intake sucks

[suby01]

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.Comparison: Fujita Short Ram vs. Injen Cold AirFor 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.Stock Nissan Air IntakeAbove 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!Where the stock intake gets it's power!It says Power Duct so it must be good right?Fujita Short Ram IntakeInjen Cold Air IntakeWell they definately look nicer than the stock intake but let's find out about that Dyno Proven Performance shall we?Getting the car on the DynoWe 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.Getting the car on the DynoGetting the car on the DynoGetting the car on the DynoSo 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.The stock intake out of the carNow 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.Out with the old and in with the newFujita Short Ram InstalledFujita Short Ram InstalledInstallation 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.Fujita Short Ram vs. Stock IntakeOverall 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.Out with the old and in with the newInjen Cold Air InstalledInstallation 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.Injen Cold Air InstalledSo 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.Injen Cold Air vs. Stock IntakeIntake Air Temp ComparisonAbove 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.Air Fuel Ratio ComparisonLooking 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.Acceleration Rate ComparisonThis 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.Fujita Short Ram vs. Injen Cold AirFujita vs InjenInjen Cold Air IntakeThe 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.

http://www.envisionelite.com/intakes.html

[lomita]

How about the follow-up? How's the car doing after a week of driving? The ECU should be nice and settled in now. When is the vehicle going back on the dyno?

BTW, Reading the bold type report, didn't do anything for my eyes, definitely not impressed with a report in bold type.

After reading this report, am not inclined to install an aftermarket intake to make more intake noise and get a little quicker acceleration at the cost of permanently reduced fuel mileage. Got anything on that, you know, before and after report on the fuel mileage? Aftermarket intakes have a history of reducing fuel mileage, more air, more fuel............

[CYO44Baseball32]

How about the follow-up? How's the car doing after a week of driving? The ECU should be nice and settled in now. When is the vehicle going back on the dyno?

BTW, Reading the bold type report, didn't do anything for my eyes, definitely not impressed with a report in bold type.

After reading this report, am not inclined to install an aftermarket intake to make more intake noise and get a little quicker acceleration at the cost of permanently reduced fuel mileage. Got anything on that, you know, before and after report on the fuel mileage? Aftermarket intakes have a history of reducing fuel mileage, more air, more fuel............

My miles per gallon have definitely increased since fujita intake install. I 've taking miles on the tank and divided it by the gallons put into the tank before and after. Before the intake I was 16-17 now I'm 19-20. Also I'm sure it helps engine has broken in now but the intake is mostly responsible.

[Sentientbydesign]

How about the follow-up? How's the car doing after a week of driving? The ECU should be nice and settled in now. When is the vehicle going back on the dyno?

BTW, Reading the bold type report, didn't do anything for my eyes, definitely not impressed with a report in bold type.

After reading this report, am not inclined to install an aftermarket intake to make more intake noise and get a little quicker acceleration at the cost of permanently reduced fuel mileage. Got anything on that, you know, before and after report on the fuel mileage? Aftermarket intakes have a history of reducing fuel mileage, more air, more fuel............

Did you read where it said leaner AFR? More air, less fuel.

[Jacko3]

I agree with some of the findings. Yes, my intake and plenum did lean out my car a little and thus, the better fuel mileage I experience---except for the ethanol gas blend which is now making my fuel mileage miserable---and reason for using synthetic oil for cooling car much better than with blend or conventional oil. In addition to this, before my modifications, my car's reasonable torque came on much earlier than with the modifications---between 3,800RPM and 5,000RPM. With modifications, the band for my reasonable torque has increased and stretched across a wider band from 4300RPM to 5,800RPM--this is even so for my 4th and 5th gear. Just my experience and 2 cents.

[smockers83]

Its a myth that it will increase MPGs. In partial theory it works, but it doesn't. Goes for all intakes.

[Sentientbydesign]

Its a myth that it will increase MPGs. In partial theory it works, but it doesn't. Goes for all intakes.

That's a very generalized statement with very little proof to back it up.

Factory intakes aren't amazingly efficient at getting air to the engine. They're amazingly efficient at killing noise.

[lomita]

What kind of intake are you running Sent?

[Sentientbydesign]

Currently, a very lightly modified stock intake.

I wanted the AEM or Fujita, but the general concensus is that the z-tube combined with Stillen or JWT saw the best gains and no losses.

I think both of those setups are fugly. So I'll be custom fabbing a Carbon Fiber intake. I'm still not sure if I'll be sticking with a drop in style filter or going with a cone.

Either way, I should see gains by smoothing out the air path and maximizing the scoop area.

On my I30, I custom rigged a short ram. During the cold months, I got great power, throttle response, and decent fuel economy 20/24.

I think the car was rated at 21/26, but I always drove too fast and accelerated too hard and had over 200k on the car.

My wife's Celica GT is EPA rated for 24/31. She get's 29 city and around 32 HWY with an AEM CAI and axle back exhaust.

[BrandAidDesignG35]

I have the Fujita F5 comp in black... I have found it has improved acceleration, sound, response over stock, but as mentioned in the write up, there was a loss in WHP.

Now, our resident Australian Andy has custom fabricated the Fujita tube, (which is wide, straight, and long) with the stock filter housing and upgraded K&N filter, he saw gains of 15 KW, which I think is 10hp over stock, kudos to him...

As far as MPG, I didn't notice any gains or losses over stock, until I installed the Greddy catback setup... now I get 100km more on a tank I think the huge resonator was killing the flow big time!!! My car now feels like a better vehicle all around, much more sporty.

Also, anyone look under their 1st gen sedan hood lately? GET RID OF YOUR MECHANICAL FANS!!! This will be my next project

THANKS FOR THE POST

[lomita]

It has been my experience, the ECU will not be able to keep up with modifications to the stock intake. How do we know we are getting a leaner mixture, when the ECU may be pumping in more fuel with more air flow, hence, the mileage drop? Unless you have an air fuel ratio meter, where are the findings coming from?

[Sentientbydesign]

It's common knowledge.

COBB's plug n play tuning device specifically says not to use it with intake mods due to the lean AFR.

COBB is more than likely leaning out the AFR below what Infiniti has it set to (which means they're probably dipping into Infiniti's safety margin).

If COBB is worried that intake mods will make the AFR too lean, then that implies that the intake mods are leaning out the AFR.

Realistically, with as many air sensors as our vehicles have, I highly doubt that we'll run rich until the ECU thinks it needs to run rich (WOT).

[lomita]

You mean it's common knowledge at Cobbs and for those using Cobbs products?

[Sentientbydesign]

Common knowlege on this board.

keep up!!!

[lomita]

Homey don't play that game!

[tollboothwilley]

they told me when i went to COBB that all the intakes really did was lean out the AFR and there really weren't any noticeable increases of REAL power. However, exhaust mods do the opposite.

So, you can get a good compromise with both.

I think COBB is working on making a setting for common setups in the G's

[Jacko3]

Toolboothwilley:

I await their information regarding mods and the use of this equipment.