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      08-02-2020, 08:24 PM   #1
Twistm4
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Airbox Modification Tests

Just curious if anyone has done some tests with different air intake configurations in regards to tuning/logging/dyno data. I see manufacturers claim one thing then private dyno sessions claim another. So I am looking at 3 different air intake configs so far and comparing the same three points of data in different conditions. IAT, Boost and Wastegate duty cycle. All in the same gear, on the same road at the same RPM.

Has anyone tried modifying their stock airbox for giggles? I know on the n54s people had luck with opening up the bottom of the boxes so more air could get into the filter when the car was not moving as fast. Seeing as I am focused on drag racing more and more, I cut a series of holes in my bottom airbox to research any differences in the data.

Three configs (all using Macht Shnell Air feed Scoops): OEM with BMC Filters, Injen evolution Intake and OEM modified with Drop ins.


Injen Evolution:
Average DRAGY 60-130 = 7.7

IAT: 84 | 86 | 82

Boost: 23.2 | 23.2 | 23.1

WGDC: 92.4 | 93 | 93.4

OEM Intake with Drop Ins:
Average Dragy 60-130 = 7.5

IAT: 95 | 102 | 100

Boost: 23.2 | 23.1 | 22.8

WGDC: 91.1 | 92.9 | 92.3

Modified Oem Intake with Drop ins: Average Dragy 60-130 = 7.4!

IAT: 75 | 90 | 90

Boost: 22.6 | 23.1 | 23.2

WGDC: 88.5 | 90.6 | 90.8

100-200kmh 6.43, 6.11, 6.04

CTS INTAKES Average Dragy 60-130 = 7.33

FINAL MODS CTS Intakes + Air Feeds + Fully Catless Straight Pipe Exhaust Average Dragy 60-130 = 7.1


As you can see, going back to the OEM airbox actually GAINED an average of 1% Wastegate Duty Cycle with even HOTTER IATS over the aftermarket injen evolution. Next to test is the modified OEM airbox vs. the MST hybrid open intake.
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      08-02-2020, 08:35 PM   #2
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Great work!!!
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      08-04-2020, 05:31 AM   #3
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So I got on the dyno today! Curious to see the differences between e30 2+ and e85 custom tune. My buddy with Cary e85 is going to same low reading dyno tomorrow and I can't wait to see his numbers.

The air cuts seemed to further drop the average but not by much. My iats were quite hot on the dyno after first pull but sat around 16-20* over ambient on the drive there.
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      08-04-2020, 07:57 AM   #4
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Could you post the dyno graphs , thanks again👏👏👏
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      08-04-2020, 03:02 PM   #5
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Quote:
Originally Posted by jballer123 View Post
Could you post the dyno graphs , thanks again👏👏👏
Its not much to look at. Dude couldn't get the tach wire hooked up. It was 85* and humid in an outside garage shop. No real fans for air flow. He also mentioned his reads about 4-6% low. So this is 21.5psi and 12.5*. On the street it sees 24-26psi and 13.5*. We think this number is more like 572 in this heat, and then around 6 ish with STD correction.

But hey if people ask Im gonna tell them it makes 550 because thats what it did xD
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      08-04-2020, 03:34 PM   #6
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Lots of power, thanks for posting, i have worked for a race teams and we always put DEI gold foil tape around our air boxes and air intake tubes to help lower ait's 👍
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      08-05-2020, 05:51 PM   #7
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hey man, can i send you the bottom of my stock airboxes and pay you to modify them?
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      08-05-2020, 06:09 PM   #8
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Sorry complete newbie here so I am a little confused

So the full intake had lower intake temps than stock ran slightly better boost but the waste gate duty cycle was higher thus making it slower?

I presume the lower the WGDC the better?
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      08-05-2020, 06:59 PM   #9
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your tests data are much more clear and easy to read than other BIG intake companies out there. we need to see the data like yours. instead they are feeding us some fancy pictures of air flow and whoknows dyno graph!
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      08-05-2020, 09:48 PM   #10
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I donít think youíll find much power from that cutting of the box but itíll pick up in the sound department
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      08-05-2020, 11:45 PM   #11
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Quote:
Originally Posted by Smee View Post
Sorry complete newbie here so I am a little confused

So the full intake had lower intake temps than stock ran slightly better boost but the waste gate duty cycle was higher thus making it slower?

I presume the lower the WGDC the better?
The higher iats was because it was much hotter outside when the tests were taken. Typically WGDC rises with heat. Cold air is much easier to compress than warm for instance. So yes the oem intakes actually performed SLIGHTLY better. I am finishing up my modified airbox readings today!
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      08-05-2020, 11:48 PM   #12
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Quote:
Originally Posted by Bluer2 View Post
hey man, can i send you the bottom of my stock airboxes and pay you to modify them?
Sometimes its hard to tell sarcasm in text. Are you trying to joke or actually serious? lol. If I could do it over again I would have left the bottom part in tact and cut just the sides and front out. Basically catching the air thats passing through the headlight area etc. Can also take out weather stripping for more airflow but not really gonna make a difference. I just used a cheap dremel tool and cleaned up with files and sandpaper. I could make it look much neater but would just take more time.
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      08-06-2020, 02:23 AM   #13
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Wow guys. Just finished up my results with modified airbox. I am actually stunned at the results!! I will update post with new findings!
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      08-06-2020, 07:38 AM   #14
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What were ambient temperatures during the tests?
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      08-06-2020, 04:15 PM   #15
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Quote:
Originally Posted by GoodtoGo View Post
What were ambient temperatures during the tests?
Take about 15-20 off IAT
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      08-06-2020, 04:16 PM   #16
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Quote:
Originally Posted by Railgun View Post
%age in and of itself is not an indicator of performance.



It's neither easier nor harder to compress. It's all about O2/density. Colder air simply doesn't require as much compression.
WGDC is an indicator of turbo work load. Which is also an indication of airflow. Using it to see if FLOW mods are making changes is beneficial. For instance, if the car is making 23 psi at 90% WGDC.. and then you put catless downpipes and exhaust on the car and now the car is making 23 psi at 87% WGDC, it means the turbos are working less to produce the same air.

Also, if all this doesn't matter how do we explain the dragy improvement? One even in worse conditions?
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      08-07-2020, 12:35 AM   #17
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Today I deleted the rear cats off the car so it is completely catless for testing. WGDC has continued to be improved just by removing the cats
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      08-07-2020, 03:26 AM   #18
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How I tested the airbox was comparing the GT4 race car air box components with the road car and it's all the same. That tells me the stock air box works efficiently enough to leave it alone The GT4 parts list also tells us it has catless downpipes to confirm the primary cat delete likely does reduce the waste gate duty cycle and performs more efficiently than stock (catted) downpipes.

Last edited by RevNev; 08-07-2020 at 03:31 AM..
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      08-07-2020, 04:22 AM   #19
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Quote:
Originally Posted by Railgun View Post
I said WG DC in and of itself...

And I never said it doesn't matter.

Draggy......that's the end result, not the why.

What changed with Inj DC? At what RPM is peak boost reached/how much earlier? What's the MAF reading? How does the ignition timing change? How much less RPM are the turbos spinning?

Sure, you can look at a singular metric and say yeah, this is great. You're not a tuner, obviously, and while this is a relatively benign change, anyone who only looks at and reports it as you have are only doing everyone else a disservice.

This platform, as capable as the ECU is has apparently made everyone a "tuner."
You're right no one should do any independent testing of anything we should all do or research nothing we don't know what we are doing. We should all rely on the manufacturers way more detailed dyno graphs and CFM flow tests.

..and reporting patterns with certain air intakes is.. claiming to be a tuner? You are quite a gem.

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      08-07-2020, 04:29 AM   #20
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Quote:
Originally Posted by RevNev View Post
How I tested the airbox was comparing the GT4 race car air box components with the road car and it's all the same. That tells me the stock air box works efficiently enough to leave it alone The GT4 parts list also tells us it has catless downpipes to confirm the primary cat delete likely does reduce the waste gate duty cycle and performs more efficiently than stock (catted) downpipes.
Yes so far my data and dyno results point to oem modified with drops and air scoops to be the best of all three so far!
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      08-07-2020, 04:31 AM   #21
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I have a cts intake on the way. I am going to create my own heat shield out of 1/4" sheet metal basically to mirror the MST intake and test + dyno + dragy.
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      08-07-2020, 06:21 AM   #22
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great, is good make all kind of test. a few years back in vey hot weather we had similar results them upgrade to front mount cold air intakes and reduce 0.20sec 100-200pkh.
keep it up !
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