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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-19-2012, 05:04 PM | #1 |
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Drop In filter test! Stock, Apexi, No filter
Event: Dyno Tune/Product Testing Location: ZipTie Dynoworks, Salt Lake City, Utah Ambient Temp: 87F Elevation: 4600 Feet Weather: Sunny Car: 2013 Subaru BRZ Tuner: None, this was for a Baseline Dyno Info: Mustang Dynamometer Transmission: Factory 6-speed Gear: 4th Peak HP: 150 Peak TQ: 116 Fuel: 91 Octane Modifications: -Apexi Panel Filter -Dimple Magnetic Oil Drain Plug -Prova Oil Filter Next we wanted to see what would happen if we just removed the factory filter, so we popped the hood and quickly removed the stock filter. One thing I will point out is that the factory air filter actually looks really really good, it has quite a bit of surface area and seem to be of super high quality, so we were impressed by that. But this is not a stock filter review, we are here to get some numbers! So we made a few more pulls with the factory air filter out of the box, and we got a maximum HP of 148 and max TQ of 114. We were hoping to see more gains out of this, but it seems like the power delivery was not as smooth, and while we did gain 1 horsepower overall, the majority of the time, we were actually under power compared to the stock filter. I am guessing this has to do with the way the air floes over the MAF sensor itself, and I do think having a filter in the box creates the proper air flow over the MAF. Now that was all done, we wanted to try out the new Apexi drop in air filter. Removing it from the box, you can instantly tell this will be a much better flowing filter than stock, and if not that, at least it is looks much better. We did have some issues installing the new air filter in the air box, this might have just been us trying to hurry to get the car off the dyno, but we had to physically remove the air box, put the filter in, clamp the air box together and bolt it back in the car. Something about a bunch of monkeys and a football comes to mind looking back on this… Once the monkeys got the air filter installed, we fired up the engine for a few more pulls. With the engine breathing much better, we achieved a maximum HP of 150 and a Maximum TQ of 116. Now this is what we are talking about! Not only did we see a gain of 3 HP and 2 TQ over the stock filter, but throughout the entire RPM range it made more power than the stock filter. Not too bad for a drop in air filter and what should have been a 2 minute install haha. Driving the car, it does seem the throttle response has improved ever so slightly, and the car does seem to pull a bit easier as well through the RPM range. Not a huge performance gain, but I figure it is a very worthwhile modification if you ever have to replace the factory panel filter and do not want to go with a true aftermarket air intake system. Just wanted to give a big shout out to all of the guys over at ZipTie Dynoworks, this was the first time I have been to their new shop and it is nice to see a clean, well-organized shop, and all the smiling faces over there always helps too. Also make sure to check out our video of our little dyno adventure [ame="http://www.youtube.com/watch?v=ARCTRzX_E3k"]The Albino Rhino BRZ hits the dyno! - YouTube[/ame] Stock vs Apexi |
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06-19-2012, 05:10 PM | #2 |
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Before anyone jumps the gun!
We know it should have been a 5th gear pull. |
06-19-2012, 05:29 PM | #3 |
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Yeah we realized that after the dyno was done :-/
As long as we stay consistent with our 4th gear pulls should not be much of a issue as the results will be consistent. |
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06-20-2012, 11:26 PM | #4 |
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I am a complete noob with dynos, but why would you need to dyno it in 5th gear?
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06-20-2012, 11:33 PM | #5 | |
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Quote:
thanks, Rick |
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06-20-2012, 11:37 PM | #6 |
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Thank you for explaining that sir .
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06-20-2012, 11:39 PM | #7 |
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06-20-2012, 11:43 PM | #8 |
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what I find interesting is that the AFR increased by a half point, that is where the power was made, so I believe once we are able to tune we may worthwhile gains. Thank you for the testing!
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06-21-2012, 12:03 AM | #9 | |
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Quote:
thanks, Rick |
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06-22-2012, 03:20 AM | #10 |
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What was the average of the runs? To compare such small gains (if any) you need to do about 5 runs and average the middle 3 to get one number. Use this to compare between the different scenarios.
I'd call this even on all fronts. Which is the usual result for air filter comparisons. The filtration ability tests are normally NOT EQUAL however. |
06-23-2012, 07:28 PM | #11 | |
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Quote:
The results of our tests are the highest readings that we gathered from each testing session. As it took a few min to swap out filters and so forth the car would cool off slightly, so doing an average would have not been accurate as it was anywhere between 1 min-5min between each batch of tests. We felt that using the highest power producing runs between each test was the most accurate way to compare the data given the test environment and the limited data we where able to gather given no ECU monitoring software currently being available. I wish we had ECU data monitoring available as then we would be able to do complete testing with much better consistency, but we did with what we had at hand for the time being. Kirill RallySportDirect.com |
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06-24-2012, 07:54 PM | #12 |
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Would the lower hp of no air filter be the results of micro dust particle's reaching the combustion chamber where as the filter would have filtered it out?
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06-25-2012, 11:10 AM | #13 | |
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Quote:
We are thinking that the loss in power is more related to the air flow going over the MAF sensor being unstable, where as with a filter is not as turbulent and the sensor being able to more accurately measure it. Kirill RallySportDirect.com |
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06-25-2012, 02:19 PM | #14 |
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are you guys going to try dynoing the k&n filters?
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