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Dyno Runs--DCI vs OEM air box (Hood Closed)
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08-08-2009, 07:06 AM | #23 |
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I think Former boosted IS did this test already recently... It would seem that if a true CAI had the flow rate of the DCI or similar, with lower IAT, or the same as, stock, that it would be better than the stock box or the DCI.
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08-08-2009, 07:55 AM | #24 |
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nice write up. thanks once again for the useful info Mr. 5. Please do think of more things to test for! It always seems interesting
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08-08-2009, 09:54 AM | #26 |
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The ambient air temp is the pink line in the graph of the IATs.
Look at both graphs..It's actually higher with the OEM box rather than the DCI setup yet the IATs went up drasticaly.
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08-08-2009, 09:56 AM | #27 |
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08-08-2009, 10:02 AM | #28 |
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So, with DCI HP increases on initial runs but drops off after what we presume is heat soak .
And Terry did a similar study and showed that your heat soaking is likely the cause of hp decrease. He also showed by using the ignition timing that the turbos worked harder with stock set up. so. Hp = increase initially dci Hp = Decrease with heat soak dci Turbo= Work harder with stock set up So my point that is more of a ? Why is it that stock setup maintains a more steady hp graph.. Is it the computer is adjusting the timing to compensate better for the extra work the turbos are doing, because if not the hp would slip just like the DCI. So Heat soak is the biggest problem......and the can't be fixed with computer so this lends credit to a closed box intake with better flow than stock for two reasons less strain on turbos than stock but not as less as dci but the computer can compensate and maybe not as much hp as dci but more reliable and more than stock. Wow...ok solve the riddle. tks for listening |
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08-08-2009, 10:09 AM | #29 | |
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Quote:
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Mods list got too long, lets just say more than enough.
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08-08-2009, 10:13 AM | #30 |
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My theory is this-
Daily driving, etc - street, twisty road, and so on, espically in the summer, you are better with the stock box or CAI. For Strip... One run every 30 mins to an hour, with proper cooling, DCI is better as these are "glory runs". Espically if you are'nt bracket racing. If you are bracket racing, the stock box is more consistent, which leaves you closer to your dail in. |
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08-08-2009, 10:53 AM | #31 |
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08-08-2009, 11:05 AM | #32 |
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Great test, I too wonder about longer-term testing (does the decreased duty cycle of the turbo's eventually make the DCI's better) and also with increased boost (like higher than map 3) would the DCI's be stronger to the point where they never drop below the stock air box. Even in this test the TQ numbers stayed 4-5 higher even with the heat soak condition and the DCI's. Which also makes me wonder with more airflow (my dyno is 4th gear and it goes about 140mph) if the engine bay would be better managed and less hot air would be getting sucked into the DCI's. One of my issues with a CAI is that you are extending a long pipe to the filter and it won't be as unrestricted overall as the DCI's (theoretically )
Again, thx Mr. 5 for the tests |
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08-08-2009, 11:13 AM | #33 |
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the fix
I have the answer.....Rip out one for stage 1 and two for stage2 or your airconditioner ducts and shove them into the cai..........10hp for each turn of the fan...dial........vaaala.....on max AC 50hp increase.
Hmmmm seriously that might work who wants to canabalize there car first. |
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08-08-2009, 11:16 AM | #34 | |
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glory run
Heck if its a Glory run save the money and rip out the intake completely......!!
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08-08-2009, 02:12 PM | #36 |
only in it for the torque - awuleth'umshini wami
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Thanks and much appreciation for doing the test.
Without debating the issue again i did a simmillar test two weeks ago but with the hood open - others have done this also - so nothing new. my final decision: out went the dual cones and back with stock box & K&N filter - the dyno confirmed my butt experience on the street - and the power gains and consistency with the stock box & drop in filter was NOT insignificant.
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08-08-2009, 03:10 PM | #37 |
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Nice. I was also under the misconception that dci is better EVERYTIME...Its great that someone took out the time to actually test everything to find out the real difference
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08-08-2009, 03:19 PM | #38 |
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I wouldn't limit the minority to just you two ..........
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08-08-2009, 04:44 PM | #39 |
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Looks like nice testing and matches well with BMS' testing. Funny you guys both did it on the same day! You should have met up or something. Which JB3 software are you on?
Anyway looking at your IAT data, we're talking about something like 8 degree difference between the peak with the DCI and peak with the stock airbox? Doesn't seem like much of a difference at all considering the hood was closed and there wasn't as much airflow as you'd get on the street. If you look at BMS' testing they measured the solenoid duty cycle and found the dual cone setup was actually better for the turbos. They also picked up as much as 25rw in parts on pump gas, much more on methanol, compared to the stock airbox. Mike |
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08-08-2009, 07:36 PM | #41 | |||
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Just in case, I was referring to this post here: Quote:
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I'm sure that once meth is involved, this test gets thrown out the window, but there are a bunch of people that don't have the meth installed that are running around town with dual cones. Another thing that I've thought about is the boost levels with the upcoming flashes. It seems like the they are getting as much power with lower amounts of boost so in my opinion, it would be much better to stick with the OEM box with their software. Of course, as I mentioned in the inital post, the dual cones should be used if going for the best 1/4 mile run (that is-if the car is cooled down).
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08-09-2009, 10:52 AM | #42 |
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I totally understand. IMO, I dont' like the whooshing sound, but I could totally understand the sound of the intake in my M3.
I loved the growl! EDIT** I also changed the titles of the runs so it's easier to read the graphs.
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08-12-2009, 12:36 PM | #43 |
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Wow, that's very valuable info. Thanks for the test! I'm currently running a K&N drop-in and was thinking of upgrading to the DCI for better performance at the track and on the street, but your tests show I should stick w/ the stock box, which is what I prefer visually (I prefer the stealth unmodded look).
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08-12-2009, 12:48 PM | #44 | |
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The hood in my test was completely closed during the runs and was open between runs. I think we're going to make a couple more runs. This time, no cool down time to prove/disprove heat soak. I'll make sure that both setups are started at the same exact IATs and that the oil temps are the same. I'll also do runs on the street to show real world IATs.
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