stock intake vs aftermarket?

NORAGRETS · 01-03-2015, 05:41 AM

i have an afe CAI on the car now, its ok, sounds good, not crazy about it...

wondering if people have switched from an aftermarket cai back to the stock intake and noticed that the stock actually makes more power/tq than an aftermarket?

realize this is a hotly debated topic....

Solo_M_Tech · 01-03-2015, 06:02 AM

Dyno the stock intake vs your afe and see. There are so many factors that will dictate the results. The only way to know is a side by side dyno comparison. I'm putting my car on the dyno this spring. If this isn't resolved by then I'll do it.

NORAGRETS · 01-03-2015, 06:04 AM

Quote:

Originally Posted by HooningB2G

Dyno the stock intake vs your afe and see. There are so many factors that will dictate the results. The only way to know is a side by side dyno comparison. I'm putting my car on the dyno this spring. If this isn't resolved by then I'll do it.

I don't have dyno access for a while, new job takes up too much time to go. I dynoed my afe and numbers were expected, but rough idle and hot air from engine on hot days were only downsides

Solo_M_Tech · 01-03-2015, 06:11 AM

Everyone knows colder denser air makes more power. On turbo cars, sealed vs open intakes don't make much of a difference because the air is heated by the turbo. Any increase in power is by shear volume of air being fed into the turbo. Make a heat shield for the open intake or find a way to make the stock intake flow better. I almost every case a hybrid style intake makes the best power. Again the fmic efficiency has more to do with the power made vs the intake. Methanol injection should be considered if the cold side intake charge is still too hot. As for the rough idle, you might need to clean the intake air temp sensor in e intake tube.

NORAGRETS · 01-03-2015, 06:15 AM

Quote:

Originally Posted by HooningB2G

Everyone knows colder denser air makes more power. On turbo cars, sealed vs open intakes don't make much of a difference because the air is heated by the turbo. Any increase in power is by shear volume of air being fed into the turbo. Make a heat shield for the open intake or find a way to make the stock intake flow better. I almost every case a hybrid style intake makes the best power. Again the fmic efficiency has more to do with the power made vs the intake. Methanol injection should be considered if the cold side intake charge is still too hot. As for the rough idle, you might need to clean the intake air temp sensor in e intake tube.

good advice and never thought about cleaning the temp sensor, i will do that this weekend thx!

NORAGRETS · 01-03-2015, 06:18 AM

what i really need is a tune for being catless

Solo_M_Tech · 01-03-2015, 06:29 AM

Quote:

Originally Posted by Twhill19

what i really need is a tune for being catless

That will create more fuel trim issues and rough idle characteristics than the intake or its sensor. The tune makes all the difference.

NORAGRETS · 01-03-2015, 07:18 AM

Quote:

Originally Posted by HooningB2G

Quote:

Originally Posted by Twhill19

what i really need is a tune for being catless

That will create more fuel trim issues and rough idle characteristics than the intake or its sensor. The tune makes all the difference.

Yeah i have a spacer in for state inspection now and it got me thinking that the tune is all the difference but I want to clean up what I can in regards to AF/r and trim

jturboawd · 01-04-2015, 08:43 AM

If you have not walnut blasted and you have more than 40k you may want to consider. Cleaned up my rough idle .

Andrewcoja · 01-04-2015, 06:35 PM

I had my CAI on and swapped back to stock for the recall. It was quieter and felt a bit more dull.

NORAGRETS · 01-04-2015, 06:41 PM

Quote:

Originally Posted by jturboawd

If you have not walnut blasted and you have more than 40k you may want to consider. Cleaned up my rough idle .

25,000 miles

Solo_M_Tech · 01-05-2015, 12:29 AM

My curriosity resides with this: In colder temps where the fuel trim is affected more by temp changes as you drive, would swapping to the factory intake in colder temps help? I don't know what kind of intake you are running, and I haven't had any issues with a rough idle on my car personally, but I wonder if this might have an affect for some.

NORAGRETS · 01-05-2015, 12:36 AM

Quote:

Originally Posted by HooningB2G

My curriosity resides with this: In colder temps where the fuel trim is affected more by temp changes as you drive, would swapping to the factory intake in colder temps help? I don't know what kind of intake you are running, and I haven't had any issues with a rough idle on my car personally, but I wonder if this might have an affect for some.

Afe "stage 2" CAI. I'm in boston so it's cold now...but 8 months of the year it's 60-100 degrees

mike@x-ph.com · 01-05-2015, 10:22 AM

Quote:

Originally Posted by Twhill19

i have an afe CAI on the car now, its ok, sounds good, not crazy about it...

wondering if people have switched from an aftermarket cai back to the stock intake and noticed that the stock actually makes more power/tq than an aftermarket?

realize this is a hotly debated topic....

As mentioned above the only way to be 100% positive is by doing a Dyno.
That being said the gains / loss will not be of anything significant between CAI and stock(1-2 whp)

NORAGRETS · 01-05-2015, 11:32 AM

id like to make a custom seal for the intake but not sure how to go about it...the rubber strip on the edge of the intake/air box def does not "seal" to underneath the hood...may take some fabrication

01-03-2015, 05:41 AM	#1
NORAGRETS Colonel 813 Rep 2,753 Posts Drives: 2017 F80 M3 ZCP BSM 2012 E82 1 Join Date: May 2012 Location: Boston, MA iTrader: (0) Garage List 2017 BMW M3 ZCP LCI [10.00]	stock intake vs aftermarket? i have an afe CAI on the car now, its ok, sounds good, not crazy about it... wondering if people have switched from an aftermarket cai back to the stock intake and noticed that the stock actually makes more power/tq than an aftermarket? realize this is a hotly debated topic.... __________________ 2017 F80 ZCP BSM - InkedCustoms.PureStage2+.ActiveAutowerkes.AR-Design.BootMod3.ApexTitanium.ProjectGamma.RW Carbon.UCP.UUC.Dinan.MachtSchnell.TMS.Eventui.aFe. RIP - E82 135i - 7/7/2021
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01-03-2015, 06:02 AM	#2
Solo_M_Tech Brigadier General 1725 Rep 3,149 Posts Drives: 2014 M5 6MT Join Date: Nov 2013 Location: Massachusetts iTrader: (7) Garage List 2014 BMW M5 [0.00]	Dyno the stock intake vs your afe and see. There are so many factors that will dictate the results. The only way to know is a side by side dyno comparison. I'm putting my car on the dyno this spring. If this isn't resolved by then I'll do it. __________________ 2014 M5 6MT
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01-03-2015, 06:11 AM	#4
Solo_M_Tech Brigadier General 1725 Rep 3,149 Posts Drives: 2014 M5 6MT Join Date: Nov 2013 Location: Massachusetts iTrader: (7) Garage List 2014 BMW M5 [0.00]	Everyone knows colder denser air makes more power. On turbo cars, sealed vs open intakes don't make much of a difference because the air is heated by the turbo. Any increase in power is by shear volume of air being fed into the turbo. Make a heat shield for the open intake or find a way to make the stock intake flow better. I almost every case a hybrid style intake makes the best power. Again the fmic efficiency has more to do with the power made vs the intake. Methanol injection should be considered if the cold side intake charge is still too hot. As for the rough idle, you might need to clean the intake air temp sensor in e intake tube. __________________ 2014 M5 6MT
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01-03-2015, 06:18 AM	#6
NORAGRETS Colonel 813 Rep 2,753 Posts Drives: 2017 F80 M3 ZCP BSM 2012 E82 1 Join Date: May 2012 Location: Boston, MA iTrader: (0) Garage List 2017 BMW M3 ZCP LCI [10.00]	what i really need is a tune for being catless __________________ 2017 F80 ZCP BSM - InkedCustoms.PureStage2+.ActiveAutowerkes.AR-Design.BootMod3.ApexTitanium.ProjectGamma.RW Carbon.UCP.UUC.Dinan.MachtSchnell.TMS.Eventui.aFe. RIP - E82 135i - 7/7/2021
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01-04-2015, 08:43 AM	#9
jturboawd Private First Class 63 Rep 184 Posts Drives: e36, e46, 135i, m4, x4m Join Date: Oct 2013 Location: houston iTrader: (0)	If you have not walnut blasted and you have more than 40k you may want to consider. Cleaned up my rough idle .
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01-04-2015, 06:35 PM	#10
Andrewcoja First Lieutenant 11 Rep 385 Posts Drives: 2011 135i MSport Join Date: Aug 2013 Location: Texas iTrader: (0)	I had my CAI on and swapped back to stock for the recall. It was quieter and felt a bit more dull.
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01-05-2015, 12:29 AM	#12
Solo_M_Tech Brigadier General 1725 Rep 3,149 Posts Drives: 2014 M5 6MT Join Date: Nov 2013 Location: Massachusetts iTrader: (7) Garage List 2014 BMW M5 [0.00]	My curriosity resides with this: In colder temps where the fuel trim is affected more by temp changes as you drive, would swapping to the factory intake in colder temps help? I don't know what kind of intake you are running, and I haven't had any issues with a rough idle on my car personally, but I wonder if this might have an affect for some. __________________ 2014 M5 6MT
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01-05-2015, 11:32 AM	#15
NORAGRETS Colonel 813 Rep 2,753 Posts Drives: 2017 F80 M3 ZCP BSM 2012 E82 1 Join Date: May 2012 Location: Boston, MA iTrader: (0) Garage List 2017 BMW M3 ZCP LCI [10.00]	id like to make a custom seal for the intake but not sure how to go about it...the rubber strip on the edge of the intake/air box def does not "seal" to underneath the hood...may take some fabrication __________________ 2017 F80 ZCP BSM - InkedCustoms.PureStage2+.ActiveAutowerkes.AR-Design.BootMod3.ApexTitanium.ProjectGamma.RW Carbon.UCP.UUC.Dinan.MachtSchnell.TMS.Eventui.aFe. RIP - E82 135i - 7/7/2021
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