Road Test Results: AFE Intake vs Stock Intake

Discussion in 'aFe Power' started by Driver72, Aug 7, 2015.

  1. Driver72

    Driver72 Gold Member

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    Hello all, let me first say this post will be long and detailed, just so it's clear as to what took place.

    I did 4 different acceleration tests and they were:

    30-100 starting in 3rd gear
    50-140 starting in 3rd gear
    40-120 in 5th gear
    60-100 in 8th gear

    I did 3-4 runs in each test. I had put 265 miles on the AFE Intake when I started the runs and it had 310 on it when I did the last run. The 265 miles originally were put on in mixed city and highway driving, everything from cruising, stop and go traffic, to WOT blasts in low triple digit speeds. So I gave it plenty of mixed adaptation miles.
    I filled up the tank both times with the same 93 Octane from the same gas station hours before the testing.

    I have a dedicated road that is basically deserted, with no homes, no buildings and no side streets on either side of the road. Large grass median in between and grassy woods on each side of the road.
    I start the tests in the exact same spot each time, crossing this black sealant strip line on the road and then I go full throttle.
    I would not do the runs if there was any other cars in the area, I would pull onto the shoulder and wait for that occasional car to pass, no matter which direction they were traveling in.
    Elevation of street is 10 feet above sea level.

    Outside air conditions were:
    Stock runs:
    79-80 degrees
    77-78% humidity
    29.95 Barometric Pressure
    Gives a DA of 1597 feet

    AFE Intake runs:
    81-82 degress
    80% humidity
    29.98 Barometric Pressure
    Gives a DA of 1725

    As you can see the temps and conditions were almost identical. I couldn't wait for the temps on the AFE to drop any further as it was already midnight, and the low last night was forecast to be 78 degrees at 5 am. The stock runs were done at 11 pm and it was 80 then and dropped to 79 midway through the testing. So that 2 degrees difference was minor but I'd of needed to wait till 5 am to match the temps, but usually humidity is highest in the morning so that would of cancelled out the 2 degree temp drop if humidity went up 5-6%

    I was monitoring and recording Oil Temps, Coolant Temps, Intercooler Temps, and the all important Intake Air Temps for each run. Keeping them all about the same, but occasionally if they were different I did a run to see how it affected the times. I learned that anything from 120-140 IAT's seemed to matter none. On one run after idling for an extended period of time the IAT reached 154 degrees and the oil temp was 210 when I pulled out to go and it still matched the prior run when the IAT was at 134 and oil temp at 190.
    However on another run when the IAT was at 147 and the oil at 217, it was one tenth slower from 40-120 than it was when IAT was at 133 and oil at 210.

    So as stated before, the times on this car are amazingly consistent no matter what the temps are at. As long as you drive it a bit prior to the run, the engine normalizes the temps and all is good.
    If you sit there idling for 10 minutes there is no air going in and around the engine and it does warm up a tiny bit, but even then it seems to have little effect on the times. So the car is amazingly good at keeping "cool" or at keeping to a temp that doesn't have much affect at all on it's performance. That may be different on a race track where you are lapping and going full throttle a lot more for a lot longer duration.

    So here's the numbers:

    30-100 Stock averaged 6.9 seconds with a best of 6.8
    30-100 AFE averaged 6.825 seconds with a best of 6.8

    50-140 Stock averaged 11.533 seconds with a best of 11.5
    50-140 AFE averaged 11.566 seconds with a best of 11.5

    40-120 Stock averaged 13.633 seconds with a best of 13.6
    40-120 AFE averaged 13.566 seconds with a best of 13.5

    60-100 Stock averaged 20.7 seconds with a best of 20.5
    60-100 AFE averaged 20.56 seconds with a best of 20.4

    So as you can see the only test that had a notable average improvement (.14 seconds) was the 60-100 speed time in 8th gear.
    This is of course the most irrelevant of the tests and nobody ever will do a test like that in real life. I did it because I wanted to do a "top gear" test and lug the engine in a big way to see what the results would be. It seemed the AFE was able to help the engine along best in that test.

    I know one could say, "wouldn't the times be a bit better if the AFE tests had the same DA as the stock?" Well, first, 128 feet difference in DA is almost nothing, maybe .03 seconds difference, however, I went to my testing location in the middle of the day the other day too, when it was 88 degrees outside and I had only 165 miles on the AFE Intake. I did one of the runs for fun, the 30-100 starting in 3rd gear test, to see what it would do at that point. I got a 6.8 second run. It was the exact same time I got on the stock intake's best time, which I was excited to see that the AFE was able to match the stock intakes time when it was 10 degrees hotter with a DA of 1935 feet (338 feet higher). But it ended up also being the best time I could get on the AFE intake last night too even with a DA of 210 feet lower than that. So again the Hellcat seems to be really consistent even when temps and conditions vary by 10 degrees and 300-350 feet difference in DA. So the 128 feet difference in DA from the AFE runs and the stock runs doubtful it would make any difference at all.

    My thoughts: I'm a bit disappointed. I was hoping for a .1-.2 second improvement in every test to show that the intake actually opened up some power for this car when on the road.
    As it stands, it did .14 seconds better on average in 1 test, but the one with the least meaning for me and everyone else.
    It did minuscule amounts better on average in 2 of the tests, and actually a minuscule worse on average in one test (though that test also had the AFE matching the stock intakes best time).
    On one test it did an acceptable job of improving the time but again it was a 8th gear WOT pull that you'd never do on the street or on a track.
    The AFE did have one test 40-120 where it's best time was .1 second faster than the stock intakes best time, but it wasn't consistent as the other runs equalled the stock intakes time.
    The test that is probably most meaningful is the 50-140 test. It's the biggest speed spread, covering 90 mph in the lowest gear, and it's the one test the AFE did the worse than the stock intake on average, and only matched the stock intakes best time.

    So to me, the AFE is doing very little in the power adding department, sadly the same results DAK found out on the dyno. I truly felt the intake would shine on the road tests compared to the dyno, but it didn't. This engine is amazingly capable and consistent no matter if it's on a dyno with limited fans or out on an open road. I don't think I've ever had a car that has such consistency in all areas like this.
    Sorry so long, but needed to be detailed.

    I have a feeling that without other supporting mods, an aftermarket intake on these cars is pointless and unnecessary. With a pulley and tune these aftermarket intakes would probably be more necessary and show gains over just the pulley and tune by themselves.

    I have sent the email for a Return Authorization. I will be returning the intake, as I have no plans to add a pulley and tune to my Hellcat.
    Thanks for reading this long and detailed post. :)
    Cheers
     
    Last edited: Feb 1, 2016
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  2. mdalemt

    mdalemt Hellcat Member

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    Great job Driver I think enough has been said.
     
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  3. Driver72

    Driver72 Gold Member

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    Thanks, and yes I agree. :)
     
  4. Zebug

    Zebug Gold Member

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    If nothing else, at least you were given a good excuse to play with your car:p
     
  5. Driver72

    Driver72 Gold Member

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    This is true.
    It always worries my wife a bit when I'm out late doing these tests, but I'm uber careful.
     
  6. wannagofast707

    wannagofast707 700 Club Member Hellcat Car Club HCC Charter Member South East Regional Pres.

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    At least it let's all of us know that the stock is good enough unless your doing tunes and upgrades. Suprising that all the tests with aftermarket parts are not making drastic differences. In my opinion (which isn't by any means an "EXPERT") SRT did a heck of job with these cars
     
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  7. Deputydog

    Deputydog Gold Member

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    Nice work.. Seems to be about what was expected.
     
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  8. Paladin06

    Paladin06 Have Guns Will Travel Staff Member Hellcat Car Club Gold Supporting Member

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    Thanks and a great write up.
     
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  9. Ray Hunsaker

    Ray Hunsaker Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    thank you for the hard work.....
     
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  10. Nycsrt

    Nycsrt BANNED

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    I need a beer and joint to read all that data
     
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  11. Nycsrt

    Nycsrt BANNED

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    But did you play wit all the knobs or just one knob?

    Default knob
    Street knob
    Track knob
    Launch control knob
     
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  12. X-Men Fiend

    X-Men Fiend Gold Member

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    Much appreciation for the balanced real-world test. I'm disappointed, was really hoping this would aid performance.
     
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  13. White Trash

    White Trash BMF Hellcat Car Club HCC Charter Member HCC National Vice Pres.

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    You found the Snake Oil !!!!

    WT
     
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  14. goingsolo2

    goingsolo2 Beast will be back bigger and better than ever! Hellcat Car Club Gold Supporting Member Hellcat Supporting Vendor

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    Thanks for your effort in all of your testing!
     
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  15. 440 Superbee

    440 Superbee Gold Member Hellcat Car Club HCC Charter Member

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    Thanks for the very informative write up. Between you and a few other forum members I have a high respect for, you've saved me the trouble of going through a full return. I just need to get my $100 deposit back, but won't have to deal with shipping issues to send the product back.
     
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