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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Modders tackle intake question



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      04-14-2014, 09:27 PM   #1
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Modders tackle intake question

I know this topic has been beaten to death, but I came across these videos by these Australian car modders/youtubers (mighty car mods for those who know them). They conducted numerous tests with both CAI and their version of DCI's (they call them POD filters) attached to various Japanese cars and basically found that there was negligible increase in hp...in fact in some of their test scenarios, the stock airbox performed better.

I'm not interested in starting another DCI vs CAI vs Stock airbox thread, though I'm sure I'm going to see those comments anyway. I just wanted to post these videos for people to view.

Video about CAI


Video about DCI (pod filters)
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      04-14-2014, 09:50 PM   #2
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Yeah dont like how they conducted their test, but you cant base one car for a general mod.

Mazdaspeed 3 intakes gain 20-25 hp because their airbox is very restrictive. So you cant exactly say that for all cars.
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      04-14-2014, 09:54 PM   #3
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Yeah dont like how they conducted their test, but you cant base one car for a general mod.
What don't you like about their testing methods?
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      04-14-2014, 09:57 PM   #4
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Methodology is shit. Sorry no good info in any of these videos.
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      04-14-2014, 10:00 PM   #5
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What don't you like about their testing methods?

You need to tune for more available air by adding fuel. Also if you don't improve exhaust flow an intake does little. They did not take any pressures upstream/downstream of filters before and after. I would trust BMS etc. dyno numbers before this crappy vid.(FYI I don't trust the DCI gains posted on BMS anyway)
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      04-14-2014, 10:13 PM   #6
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Originally Posted by Ingeniator View Post
You need to tune for more available air by adding fuel. Also if you don't improve exhaust flow an intake does little. They did not take any pressures upstream/downstream of filters before and after. I would trust BMS etc. dyno numbers before this crappy vid.(FYI I don't trust the DCI gains posted on BMS anyway)
Yeah, I definitely agree a tuning mod combined with these test runs would have made the data more accurate...I'm not sure I agree with you on the exhaust piece though.

But anyway I've seen more than a few aftermarket shops advertise that a DCI or CAI setup by itself could improve peak hp by 10-20hp, and I think that is wrong.

I do wonder though, if DCI's and/or CAI setup's did generally add more hp in combination with a tune, why don't the car makers themselves offer those setup's?
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      04-14-2014, 10:18 PM   #7
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The exhaust mostly applies to NA cars. In a lot of cases the stock headers and exhaust are the air restriction after the filter. You gain a little from the filter a lot from headers and if you put the stock air box back on you lose most of the gains. FI cars are different because 95% of the time the turbo is the exhaust restriction. Buy adding a filter you can improve turbo efficiency and lower post turbo air temp which improves intercooler duty and prevents IAT related fuel cuts.
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