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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 > Dyno Runs--DCI vs OEM air box (Hood Closed)



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      08-14-2009, 11:33 AM   #67
Digital.James
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Originally Posted by Mr. 5 View Post
I had the cowling removed first of all.
I routed the tack wire up towards the windshield and routed it over the passenger mirror so it would stay.
If you do this then you could slam the hood without crimping anything.

Edit...you must have had a fun time last night to post at 2:30 in the morning.
Haha I'm in Iraq so I was at work
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      08-14-2009, 02:27 PM   #68
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So from what I`ve read in this thread,the DCI is losing its effectivness after a while due to the phenomenom called heat soak
Thus a K&N Air Filter suffices for normal driving.

But what about people living in areas like...umm....Germany?
We don`t have too many hot days and most of the year it`s rather chilly..
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      08-14-2009, 08:14 PM   #69
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Originally Posted by ebeem View Post
So from what I`ve read in this thread,the DCI is losing its effectivness after a while due to the phenomenom called heat soak
Thus a K&N Air Filter suffices for normal driving.

But what about people living in areas like...umm....Germany?
We don`t have too many hot days and most of the year it`s rather chilly..
I live in Huntington Beach so the climate here is pretty nice.
No matter what, It's the under hood temps that are the problem.
I really don't care about how cold or hot it is outside.
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      09-02-2009, 06:33 PM   #70
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That cold run to cold run is surprising. We are doing some baseline product testing with my car in the next couple of days with the bone stock ECU. I will do the removing the filter test for you guys and then when the goes back into HP mode I will do it again and post up the raw findings. On our dyno with back to back testing removing the filter on stock boost or 14 psi yielded no gain. I will say on any of our runs we make sure oil temp is at proper operating level. Maybe our cold runs are not cold enough. However if that is the case we would throw those numbers out anyway as you would never want to run your car like that. In any event when I get it on the dyno I will do the test as we previously stated we would

Edit: just went back and re read your post and it sounds like we are on the same page:
Quote:
"I was actually surprised with how well the DCI setup did for the first run, but thinking about it after the fact, I honestly feel that the AITs of the DCI were lower in the first run due to the engine not being up to normal operating temperature. This is why I believe that the AITs of the OEM air box were higher than the DCI with the first run"
Other than the cold numbers this is just about exactly what I thought it would do. BMW is no joke and they knew what they were doing when they designed that airbox. I just wish they would of put a little more thought into the turbo inlet hoses.
Thank you for the test.

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      10-07-2009, 06:15 AM   #71
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+1^
Extra: and if you did put on the stock and clean(!) paper filter, the OEM would perform better.
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      10-07-2009, 08:24 AM   #72
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there is a simple way to see how restrictive an intake is:

Measure the depression (it is under the ambient pressure) inside the pipe that goes from the intake to the turbo. if the filter has zero restriction it will be close to ambient pressure, if the filter is restrictive then the pressure will go down and the turbos will have to spin up more to obtain the desired boost.

Did anyone tried this?

Will try it out by putting a boost gauge on the breather pipe (where the OCC connects to the turbo intake air pipe)
And see if OEM airbox generates pressure like a real RAM or goes under-pressure due to restrictions. After testing the DCI...
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      10-07-2009, 12:02 PM   #73
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anyone ever tried to dyno a drop in filter vs the oem?
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      10-07-2009, 12:05 PM   #74
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me likes whooshing noises =]
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      10-08-2009, 12:40 AM   #75
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I took the DCI off and replaced with stock airbox today also. Car seems to pull harder on low and mid end as well. I have not dynoed under this set up yet though.

One thing to note: my miles/gallon increased after I put the stock airbox on.
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      10-08-2009, 08:15 AM   #76
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Quote:
Originally Posted by cgeorge View Post
I took the DCI off and replaced with stock airbox today also. Car seems to pull harder on low and mid end as well. I have not dynoed under this set up yet though.

One thing to note: my miles/gallon increased after I put the stock airbox on.
Stock filter?
We have almost identical setups and my MPG definitely dropped. If you just did this yesterday then how do you really know your mileage hasn't taken a hit?

Fill'er up and give it a week ............ let me know the results then.
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      10-08-2009, 11:05 AM   #77
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Quote:
Originally Posted by Mr. 5 View Post
I live in Huntington Beach so the climate here is pretty nice.
No matter what, It's the under hood temps that are the problem.
I really don't care about how cold or hot it is outside.
Do you think gold foil wrapping on an intake's piping like the injen (sits further away from the engine) would yield any improvement?

But otherwise it seems that DCIs are no good for longer runs...how about externally piped CAI's like the Stett or UR...do you think they would suffer the same fate as DCIs?

Thanks
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      11-25-2010, 10:45 AM   #78
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Do you think gold foil wrapping on an intake's piping like the injen (sits further away from the engine) would yield any improvement?

But otherwise it seems that DCIs are no good for longer runs...how about externally piped CAI's like the Stett or UR...do you think they would suffer the same fate as DCIs?

Thanks
I guess that was a dumb question...
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      11-25-2010, 11:08 AM   #79
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I guess that was a dumb question...
I'm guessing the air moves so fast through the intake that insulating it would do nothing-you're still sucking hot air from under the hood. You'd be better off wrapping (coating) the exhaust parts to keep the temps down under the hood.
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      11-25-2010, 11:16 AM   #80
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i was also testing bms dci on dyno and i gained about 3 hp with hood closed, so with tune its should affect more i think i also have scoops
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      11-25-2010, 11:29 AM   #81
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Holy resurrected thread batman!
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      11-25-2010, 11:48 AM   #82
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Holy resurrected thread batman!
I DD my car... year round, i live in NJ.. I bought a BMS dci, should I install it or go with a Macht Schnell Filter with stock airbox instead?
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      11-25-2010, 10:06 PM   #83
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anyone ^?
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      11-26-2010, 12:22 PM   #84
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im wondering myself which is best with a tune but i tihnk the stett intake to em looks like it may help the most cant find any owners with this thou !!!
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      11-26-2010, 01:01 PM   #85
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im wondering myself which is best with a tune but i tihnk the stett intake to em looks like it may help the most cant find any owners with this thou !!!
The question is does the DCI really get so heatsoaked on a DD that it makes it worse than stock, at least with stock if you get a panel filter (better filtration may add 2 hp) but at least you won't lose as much with heatsoak.
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      11-26-2010, 01:58 PM   #86
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I did another test after this thread and saw that even though the heatsoak is there, the turbos will work harder to make the same amount of boost under the stock air box vs the DCI.

In summary, if you have the ECU is stock then go with the stock air box, but if you are pushing 15+ psi then it's easier on the turbos to run the DCI.
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      01-19-2011, 10:15 PM   #87
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Quote:
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I did another test after this thread and saw that even though the heatsoak is there, the turbos will work harder to make the same amount of boost under the stock air box vs the DCI.

In summary, if you have the ECU is stock then go with the stock air box, but if you are pushing 15+ psi then it's easier on the turbos to run the DCI.
Agreed. The DCIs are sorta pointless for stock boost (other than the intoxicating noise) but those with higher boost should go with DCIs.
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      01-20-2011, 09:16 AM   #88
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Holy resurrected thread batman!
Riddle me this...

The amount of air driving 60+ mph is more than the shop dyno fans blowing into the front grilles? Would a cowl hood help with elleviating hot engine air? With a dci setup, does the stock ram air set up not deliver outside air to the cones?

Ive been a BMW owner for less than 2 months so all these old threads are great bed time reading or even middle of the night bottle feedings for my daughter.
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