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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 > Does DCI help performance at all?



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      03-24-2009, 02:04 PM   #1
GAaaAR
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Does DCI help performance at all?

I notice recently some people are claiming the DCI does absolutely nothing. In the beginning people were raving about how it feels more responsive, tuners are claiming hp increases and some say it only helps when you have a tune.

Now I'm noticing people like HotRod that claims he didn't find any conclusive evidence that DCI helps at all and it even slowed down his car a bit. Vyruz Reaper also feels it doesn't do much. Some ppl are saying they don't really notice a difference in performance


Let's settle this once and for all. Looks aside, does DCI do anythign at all for performance. What I mean by performance is not hp numbers on a dyno, but quite simply, are there any evidence whatsoever that supports it making your car go faster? I think we can all agree a DCI won't do much, but does it do anything at all or even worse slow you down?
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      03-24-2009, 02:07 PM   #2
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Quote:
Originally Posted by GAaaAR View Post
I notice recently some people are claiming the DCI does absolutely nothing. In the beginning people were raving about how it feels more responsive, tuners are claiming hp increases and some say it only helps when you have a tune.

Now I'm noticing people like HotRod that claims he didn't find any conclusive evidence that DCI helps at all and it even slowed down his car a bit. Vyruz Reaper also feels it doesn't do much. Some ppl are saying they don't really notice a difference in performance


Let's settle this once and for all. Looks aside, does DCI do anythign at all for performance. What I mean by performance is not hp numbers on a dyno, but quite simply, are there any evidence whatsoever that supports it making your car go faster? I think we can all agree a DCI won't do much, but does it do anything at all or even worse slow you down?

more for sound but a little better throttle response too...
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      03-24-2009, 02:12 PM   #3
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Originally Posted by ultimateendz View Post
more for sound but a little better throttle response too...

Yes, but the question is, would the throttle response be reflected in any type of performance testing? Higher traps, Faster 1/4mile, faster 0-60, faster 0-100 or even faster 0-150mph?
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      03-24-2009, 02:16 PM   #4
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Originally Posted by GAaaAR View Post
Yes, but the question is, would the throttle response be reflected in any type of performance testing? Higher traps, Faster 1/4mile, faster 0-60, faster 0-100 or even faster 0-150mph?
Most people probably wouldnt be able to tell the difference unless they were running a tune...in that case yes some of your times may be quicker...people chime in here if im wrong...
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      03-24-2009, 02:16 PM   #5
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Oh god, not another one of these threads. They are so cheap used ($60), pick one up and try it. If you're not happy with it, flip it and get your money back.

I personally felt no increase in power; however, the sound alone is worth the 60 or so bucks.
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      03-24-2009, 02:19 PM   #6
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I'm a nonbeliever, and very happy with my stock intake . Only intake I would consider would be a true cold air intake, like the one Dinan will be releasing soon.. I felt an increase in throttle response and the spooling sound of turbos with my tune + catless dp's..and feels like 20-30 hp more from my butt dyno because my car always breaks traction now, and rarely did before.
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      03-24-2009, 02:20 PM   #7
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Too bad I installed DCI only few days after i did tune. The only thing i could tell was the sound.
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      03-24-2009, 04:38 PM   #8
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It's not about the money. I just want to know exactly what it does. I know about the sound and looks, but not so much the performance.

Quote:
Originally Posted by Rotary Rasp View Post
Oh god, not another one of these threads. They are so cheap used ($60), pick one up and try it. If you're not happy with it, flip it and get your money back.

I personally felt no increase in power; however, the sound alone is worth the 60 or so bucks.
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      03-24-2009, 04:40 PM   #9
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Once you get over about 13psi, the stock airbox becomes a restriction and your turbos will work harder to make the same boost.

All the big dyno numbers come from cars with DCI's
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      03-24-2009, 04:43 PM   #10
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If you're stock, the DCI will do absolutely nothing in terms of performance, at least nothing the butt-dyno can tell.
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      03-25-2009, 05:13 PM   #11
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aFe Dual Cone Intake for the 335i:



I noticed a difference, but then again, my 335i is in the 400hp territory and this was the last mod I put on, so it made it easier for the turbos to make more boost.
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      03-25-2009, 05:37 PM   #12
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I found it doesn't do much. Shows a slight gain on the dyno, but at the track & road it doesn't seem to gain anything. Weird as usually intakes don't show gains on the dyno, but work on the road.
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      03-25-2009, 05:43 PM   #13
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It should increase HP... but your butt dyno will certainly not notice 15 Hp increase which equates to roughly 5% power increase...

As everyone said, the power increase is noticeable only on tunes cars, otherwise the only real tangible benefits are the addicting WOOOSHHHHH sound and the looks
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      03-25-2009, 05:46 PM   #14
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      03-25-2009, 05:47 PM   #15
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Quote:
Originally Posted by Jlevi SW View Post
aFe Dual Cone Intake for the 335i:



I noticed a difference, but then again, my 335i is in the 400hp territory and this was the last mod I put on, so it made it easier for the turbos to make more boost.
Those numbers on the AFE are in such conflict that I don't think any customer has even come close to the +27whp marketed gain. There are even 3-4 members that showed an actual loss in power with AFE. IMO I think it just falls somewhere in the middle, +10-15whp gain.
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      03-25-2009, 05:52 PM   #16
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Quote:
Originally Posted by RiXst3r View Post
Once you get over about 13psi, the stock airbox becomes a restriction and your turbos will work harder to make the same boost.

All the big dyno numbers come from cars with DCI's


I dyno'd my car with the aFe last summer and, though I have the Dinan Stage II & upgraded exhaust, I had a sustained 13-17 rwhp increase with the DCI installed. Mind you this was with less than friendly conditions ........ 97 degrees w/ near 70% humidity and less than adequate "wind" with the dyno. BTW, unbeknownst to me at the time my car was also suffering from a faulty HPFP that was replaced within a couple of weeks of the dyno run.

Not sure what I would have now considering I have catted DP's installed.
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      03-25-2009, 06:17 PM   #17
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Quote:
Originally Posted by Jlevi SW View Post
aFe Dual Cone Intake for the 335i:



I noticed a difference, but then again, my 335i is in the 400hp territory and this was the last mod I put on, so it made it easier for the turbos to make more boost.
shame on you guys for spreading that utter BS.
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      03-25-2009, 07:18 PM   #18
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definately helps if you are tuned
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      03-25-2009, 07:55 PM   #19
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shame on you guys for spreading that utter BS.
No kidding. I don't want to scroll up to see who posted up the screenshot of the AFE dyno claiming 27 horsepower as I don't want to hold a grudge but seriously... SHAME ON YOU!
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      03-25-2009, 09:13 PM   #20
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Those dyno results I believe are taken directly from aFe's own site ........ results are attainable, just not to THAT degree.

By the way, just to have an environment THAT perfect to dyno test a product is next to impossible unless you're the manufacturer of the product.
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      03-25-2009, 09:19 PM   #21
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Quote:
Originally Posted by Jlevi SW View Post
aFe Dual Cone Intake for the 335i:



I noticed a difference, but then again, my 335i is in the 400hp territory and this was the last mod I put on, so it made it easier for the turbos to make more boost.
What is going on over there at jlevi. It's like someone hacked your account and started spewing nonsense in every sub-forum.

It's common knowledge that NO ONE has replicated the dyno gains that aFe claimed.
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      03-25-2009, 09:58 PM   #22
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What is going on over there at jlevi. It's like someone hacked your account and started spewing nonsense in every sub-forum.

It's common knowledge that NO ONE has replicated the dyno gains that aFe claimed.
Times are tough; the economy is in the crapper...the deep recession has decreased sales so some companies pull out all the b.s. to try to sell more.

FWIW, I have the aFe DCI, and I may just go back to the stock intake on my '10 335i (on "pre-order ).
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