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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 > Stock Intake vs Burger DCI Temp Tests on 335i



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      10-28-2013, 01:30 AM   #1
zafeniak
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Stock Intake vs Burger DCI Temp Tests on 335i

Hi Guys -

I bought a Burger DCI (Dual Cone Intake) for my 335i last week and decided to test the intake temps for myself to determine whether the heat soak myth is true.

I thought I might share my results with you guys which may help you make a decision on whether to go for a DCI setup or not.

Here it goes -

Scenario:

i) 19-20 degree (Celsius) day
ii) Tests were performed within 30 mins of each other
iii) Car was warmed up on both (Standard intake and DCI) tests to ensure oil temp was just below 120 degrees Celsius
iv) A 15 minute drive (same route) was performed with both the standard intake and DCI to measure the driving temps (not my main focus)
v) After the 15 minute drive, I measured the intake temps while the car was stationary and idling for 2 minutes (simulating a traffic light) plotting the temps every 5 seconds

Things I found using the stock intake:

* Driving normally (i.e. not thrashing the car) the intake temperature was usually between 27 - 30 degrees Celsius.

* The harder you stepped on the gas pedal, the cooler the intake temps were (due to the air being sucked in is from the outside)

* The car was quieter compared to the DCI setup

Things I found using the Burger DC Intake:

* Car sounded great (nice turbo spool sound)

* Driving normally (i.e. not thrashing the car) the intake temperature was usually between 37.5 - 40 degrees Celsius.

* The harder you stepped on the gas pedal, the hotter the intake temps were (due to the air being sucked in being from the engine bay



Heat soak results:

After driving the car for 15 mins (same route) with both set-ups, I measured the temps while the car was stationary and idling for 2 minutes (graph speaks for itself) simulating traffic light stop.

Not only was the starting intake temp about 9 degrees hotter with the DCI compared to the standard intake, the intake temps accelerated at a quicker rate (i.e. Starting temp of stock intake was 29 degrees, starting temp of DCI was 37.5, ending temp of stock intake was 34 degrees, ending temp of DCI was nearly 48 degrees after 2 minutes)


Conclusion:

Heat soak is real (both when driving and stationary)!

Now, I am sure the DCI can suck in air more efficiently compared to the stock intake given the greater surface area, however, this advantage is really crippled by the fact that the intake temperatures are significantly higher compared to the stock intake.

The only real way to measure whether the benefit of the DCI sucking in air more efficiently outweighs the con of the increased temps is to put it on a dyno... which is something I don't have.

But in any case, I hope this helps you guys in making a decision


I also have for sale a "Near new" set of Burger DCIs for a 335i (only used for about 15 minutes) located in Australia Canberra - PM me if interested.
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      10-28-2013, 01:58 AM   #2
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This has been done..
Do a
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      10-28-2013, 02:11 AM   #3
zafeniak
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I was merely sharing my results man, no need to be like that
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      10-28-2013, 02:19 AM   #4
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Nice work.
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      10-28-2013, 02:32 AM   #5
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Nice work, thanks for sharing.

I had actually wanna buy this DCI, but not anymore.
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      10-28-2013, 02:48 AM   #6
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For my point of view the only best solution is dinan Intake

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      10-28-2013, 02:55 AM   #7
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Wow! That looks promising, and shiny! How much do they retail for and who sells them?

If anyone is after some near new DCIs I'm selling mine for $90.
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      10-28-2013, 06:16 AM   #8
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Quote:
Originally Posted by zafeniak View Post
Wow! That looks promising, and shiny! How much do they retail for and who sells them?

If anyone is after some near new DCIs I'm selling mine for $90.
Its made by a company called Dinan, and it retails for around 1200.
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      10-28-2013, 06:29 AM   #9
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Where were you measuring the temps
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      10-28-2013, 07:13 AM   #10
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I would hang onto your DCI just in case you want to do more mods, like a tune, FMIC and DP's.
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      10-28-2013, 09:08 AM   #11
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imo save your money for other mods. DCI's work fine for me. lol
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      10-28-2013, 09:17 AM   #12
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If we could measure flow on one vs the other we'd have a better idea if the increased temps are worth the trouble.

Since these cars are turbocharged and intercooled, it'd be better to test the air temperature pre-turbo vs post-turbo on both setups to see if the increased temps make a large enough difference once the air is sent through the turbos.
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      10-28-2013, 09:21 AM   #13
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This is exactly why I have a sealed, true CAI. I wouldn't waste my money on the Dinan CAI, while it looks very nice, you have to remove a chassis brace to install it and there are other products that perform just as well (AFE sealed intake).
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      10-28-2013, 09:25 AM   #14
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Quote:
Originally Posted by zafeniak View Post
Hi Guys -

I bought a Burger DCI (Dual Cone Intake) for my 335i last week and decided to test the intake temps for myself to determine whether the heat soak myth is true.

I thought I might share my results with you guys which may help you make a decision on whether to go for a DCI setup or not.

Here it goes -

Scenario:

i) 19-20 degree (Celsius) day
ii) Tests were performed within 30 mins of each other
iii) Car was warmed up on both (Standard intake and DCI) tests to ensure oil temp was just below 120 degrees Celsius
iv) A 15 minute drive (same route) was performed with both the standard intake and DCI to measure the driving temps (not my main focus)
v) After the 15 minute drive, I measured the intake temps while the car was stationary and idling for 2 minutes (simulating a traffic light) plotting the temps every 5 seconds
I've done a lot of temp comparison for myself and the only point I agree on with you is that DCI temps can run about 9 degrees hotter.

I think where you went astray here is performing your tests 30 minutes apart.

Remember, You are not just measuring the intakes.....but also the impact of the starting temp of the intercooler plays a significant role.

If the intercooler was already heated up from the first session it will skew the temps from that point onwards.

Oil temps are not going to factor in starting with a cold intercooler vs an already hot one.

Case in point.....I can keep my intake temps about 10 degrees cooler by not going WOT. Once I go WOT temps rise and and the intercooler saturates and then stabilizes at a higher temp while cruising afterwards.
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      10-28-2013, 09:37 AM   #15
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I dont understand why ppl expect an intake to work like an "FMIC + Intake" ...
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      10-28-2013, 09:42 AM   #16
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Thanks for carrying out the test and sharing your results... But this was obviously known without tests needing to be carried out.

The turbos work a lot harder trying to pull air into the engine with the restrictive stock intake system. So the turbos run hotter, less efficiently and the intake temps entering the engine are also hotter.

What is important is to get a decent intercooler that can help reduce the intake temps.

It has been proven over and over again that the shortest pipe work is ideal for turbos to run at their most efficient. That's why the jap fan bois strap they filter directly to the turbo. It is a shame we are unable to do the same.
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      10-28-2013, 12:04 PM   #17
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These results are a little different than other tests I've seen so I wonder if they were carried out properly. The tests I've seen showed similar temperatures during cruise and WOT. Within a few degrees. At idle the DCI heats up a little faster but not much as most of the heat buildup comes not from the filter air temperature but the exhaust manifold/turbocharger assembly as air slowly moves through it absorbing engine heat.

Regardless, I have found that those obsessed with intake temperatures tend not to be the ones running the fastest times at the track or runway. The DCI dominates performance oriented enthusiasts but the best alternative is the Mr5 home modified airbox in my opinion.

Mike
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      10-28-2013, 12:18 PM   #18
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      10-28-2013, 01:46 PM   #19
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IMO you'd have to do the same test next day but swap which one you tested first and compare both days against each other to even have a starting point to make a thread like this.
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      10-28-2013, 02:44 PM   #20
zafeniak
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Thanks for the comments guys.

The car was driven 30 minutes with the stock intake before any testing was done.

Then I stopped at home to strap the temp guage in the air box.

I then tested the stock intake for 15 mins.

Came back home, and took me about 25 mins to install the DCI with the bonnet open the whole time, so I would say this would've been an advantage for the DCI as all the hot air was escaping.

In any case, I drove both set-ups for 15 mins to ensure any heat from being stationary disappeared.
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      10-28-2013, 03:03 PM   #21
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Quote:
Originally Posted by zafeniak View Post
Thanks for the comments guys.

The car was driven 30 minutes with the stock intake before any testing was done.

Then I stopped at home to strap the temp guage in the air box.

I then tested the stock intake for 15 mins.

Came back home, and took me about 25 mins to install the DCI with the bonnet open the whole time, so I would say this would've been an advantage for the DCI as all the hot air was escaping.

In any case, I drove both set-ups for 15 mins to ensure any heat from being stationary disappeared.
If you are measuring temperatures before the turbo then the testing is irrelevant. You need to measure temperatures as they enter the engine to have a relevant comparison. And you'll find they are fairly similar between the factory and DCI intakes. The DCI may be a few degrees higher but the turbo does a lot less work at higher RPM as a result of the DCI's higher flowing characteristics.

Mike
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      10-28-2013, 03:19 PM   #22
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For the DCI defenders, what is the advantage(S) of the DCI over the stock one? show technical prove.
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