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BMW 3-Series (E90 E92) Forum
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Meth with stock downpipes?
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05-31-2011, 07:54 PM | #45 | |
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05-31-2011, 08:08 PM | #46 | |
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05-31-2011, 08:14 PM | #47 | |
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You can see I'm in definite need of more power in my video. The Hankook Ventus V12 evo tires you personally recommended hook up real good. Now I need to adjust my power to the wheel spin threshold and I'm done modding. -------->
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Mods: JB4, BMS DCI Intake, HPF FMIC, Forged DVs, ceramic Tint, Black Emblems, 93 Octane Last edited by 335i 07; 05-31-2011 at 08:51 PM.. |
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05-31-2011, 08:27 PM | #48 |
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Of course it's high boost, but I took the OPs question as to whether DPs are required... i don't think it makes much difference in turbo longivity at similar boost pressures. It does matter if maxing boost or maxing power, but he was asking if he can keep stock DPs.
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05-31-2011, 08:30 PM | #49 |
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05-31-2011, 08:36 PM | #50 | |
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I like to have the power on tap..but does that mean that I blast to 16psi n every gear all the time..NO..but when I do..i like knowing that i have a lower pressure drop cooler IATs thru FMIC and minimal ar restriction thru intake, DPs and exhaust.. |
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05-31-2011, 08:57 PM | #52 |
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LMAO,,i didnt even realize u were the OP on that thread..i went to war w all those guys telling u run the Michelin PS2 for $400 more...u should go back and post how u like the Hankooks..VINDICATION..
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05-31-2011, 09:30 PM | #53 | ||
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If your talking about catless DP's when you mention DP's above. Your not running the turbo's any harder. The gained power comes from efficiency. To achieve 300 rwhp with catted DP's you need to run x psi, to achieve this number with catless DP's you could run less target boost because the system is more efficent.. meaning less power lost through wasted energy, primarily heat. Your not asking the turbos to do any more at 10 psi to make 300 rwhp then you are asking them to run at 10 psi to make 340rwhp, the power gained is not from the turbo's working harder, its from the increase in flow efficiency between the cats and FMIC. Quote:
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2014 Individual /// M5 Competition AW/AB || Vorsteiner FF-103 || BMS JB4 || Meisterschaft GTC || RPI || IND || Challenge || Last edited by ///M3THOD; 05-31-2011 at 09:38 PM.. |
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05-31-2011, 09:47 PM | #54 | |
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05-31-2011, 09:49 PM | #55 |
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I went ahead and bought the AA DPs to accommodate my future meth kit and boost increase. Such a good deal with this Group Buy. http://www.e90post.com/forums/showth...57#post9722057
If they sound loud or raspy I will just sell them here and take a $100 loss. O well. The question is will the stock exhaust still sound the same after I put miles on it. Guess only time will tell.
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2007 335i
Mods: JB4, BMS DCI Intake, HPF FMIC, Forged DVs, ceramic Tint, Black Emblems, 93 Octane |
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05-31-2011, 09:55 PM | #56 |
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Congrats,,yeah that AA group buy is a deal..dont forget to pick up the BMS o2 simm..so u dont get the running rich/lean codes froming being catless. It wont sound bad at all especially w stock exhaust..just more growl when u get on it
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05-31-2011, 09:59 PM | #57 |
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Don't think I need the Sim. Im running a JB4 tune.
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2007 335i
Mods: JB4, BMS DCI Intake, HPF FMIC, Forged DVs, ceramic Tint, Black Emblems, 93 Octane |
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06-01-2011, 12:55 AM | #62 | |
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06-01-2011, 11:31 AM | #63 | |
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Geez guy give it up. |
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06-01-2011, 11:57 AM | #64 |
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06-02-2011, 01:40 PM | #65 |
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Ok, I didn't give up and had a little extra time today. DPs matter for power only, and no advantage to turbo life when comparing boost pressure. If you lower boost, of course it's better for the turbos.
Now, a little visual aid on this topic. Below is our compressor map with the approximate plot of the N54 making around 400hp... these calcs were done by Cobb Tuning. I added the black lines representing DPs. DPs increase flow, so you can move the plot to the right at same boost, or lower boost to equal flow. I think this is a fairly accurate depiction of DPs or no cats. Clearly DPs are not needed for turbo efficiency and because of the extra flow, power you start decreasing efficiency sooner. N54 has very small turbos. IATs and octane to sustain the extra cylinder pressures and heat at increased boost is the concern. Last edited by Joshboody; 06-02-2011 at 02:13 PM.. Reason: revised attached map |
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