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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 > Twin Turbo Vs. Bi-Turbo



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      04-09-2007, 02:25 PM   #23
batlin
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Quote:
Originally Posted by Sparkplug View Post
Both bi-turbos and twin turbos have different engineering advantages and applications. Bi-turbos are very versatile, being able to adapt to both male or female engines. Twin turbos offer two-on-one potential.
Is there a Trans-turbo? I personally prefer twins
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      04-09-2007, 02:31 PM   #24
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Originally Posted by s4iscool View Post
bi is a german thing. no difference.

You mean Germans are gay?
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      04-09-2007, 03:04 PM   #25
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Well not EXACTLY...

Quote:
Originally Posted by Ryan335 View Post
Same thing. Twin means two, Bi means two. you are overthinking this one just a little bit homie
Twin-sexual (which is FUN) vs. Bi-sexual (not my cup o'tea) so I'm going to argue that twin and bi are not the same.

heh heh

Oh...turbo...sorry - he's right.

Carry on.


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      04-09-2007, 03:30 PM   #26
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I had a 97 Porsche Twin Turbo. In the US it was always called the twin turbo.
in Any German videos it was described as the "Porsche bi turbo Carrera" with a thick German accent.
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      04-09-2007, 05:28 PM   #27
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Quote:
Originally Posted by ch330i View Post
Hmm but who makes better turbos than Mitsubishi. Only lately have i been seeing turbo'd mitsubishi's around here, let alone anywhere. They're on the rise Why doesn't BMW venture in to supercharged land like MB
You might just be seeing them lately (ie. evo 8, 9), but Mitsubishi has been producing turbo cars for a long time over seas, they just never brought them to the US market (there was an evo 1 before there was an evo 8 ). They also produce the turbo's for Greddy/Trust so they are a trusted manufacturer of turbos. Also, they built these turbo's to BMW's specs so I can't see how BMW could make them better if they already made what they wanted. BMW doesn't venture into MB land with SC'ers because they are way less efficient then turbo's are. You are driving a turbo with your exhaust gases, which is essentially waste from the engine, instead of using your crank pulley that leads to a loss to drive the damn thing. Don't even get me started on MB, I think that their SC'd cars drive like crap, the throttle response is horrible... i'm not a fan of their cars in general though. Long story short, Turbo > SC'er.
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      04-09-2007, 05:29 PM   #28
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Quote:
Originally Posted by paulGT3 View Post
I had a 97 Porsche Twin Turbo. In the US it was always called the twin turbo.
in Any German videos it was described as the "Porsche bi turbo Carrera" with a thick German accent.
Now that you mention that I can remember seeing videos online of the 997 TT when it first came out, and in that really thick German accent the guy said "Carrera Bi-Turbo."
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      04-09-2007, 06:29 PM   #29
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Quote:
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I would have bet a steak dinner that the 335i's were "twin turbos", since the conventional meaing of twin is "one the same as the other". I can accept that all setups with two turbos are bi-turbos, regardless of plumbing. I thought the logic would be: "All twin-turbos are bi-turbos, but not all bi-turbos are twin-turbos."
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      04-09-2007, 07:28 PM   #30
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Here is a picture of the Bi-turbos that the S4 uses, internally the turbine/compressor wheels are identical however the housings as you can see are different. So basically there are two part #'s and probably the reason they don't call them "twins"

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      04-09-2007, 07:33 PM   #31
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Quote:
Originally Posted by batlin View Post
Is there a Trans-turbo? I personally prefer twins

How about bi-twins?
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      04-09-2007, 08:26 PM   #32
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BMW's Sequential Turbo, full report here...http://autospeed.drive.com.au/cms/A_2544/article.html


1. At low engine speeds the intake air flows through the large turbocharger and is compressed in the smaller turbocharger. This supplies substantial amounts of air to the power unit, starting without any appreciable delay at idle speed. The 3.0 litre inline six-cylinder diesel develops 530 Nm of torque at as early as 1,500 rpm.

2. With increasing engine speed, the larger turbocharger becomes more important - initially as a pre-compressor. The intake air is additionally highly compressed inside the small turbocharger, the engine reaching its maximum torque of 560 Nm at 2,000 rpm. By means of a turbine control valve, the flow of exhaust air is variably distributed to both turbochargers, regulating their interaction.

3. At high engine speeds work is done primarily by the large turbocharger, the power unit reaching a maximum output of 200 kW/272 bhp at 4,400 rpm.
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      04-09-2007, 10:23 PM   #33
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Quote:
Originally Posted by s4iscool View Post
bi is a german thing. no difference.
so does that mean that Bi-sexual = Twin sexual???
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      04-10-2007, 10:20 AM   #34
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Quote:
Originally Posted by Railgun View Post
+1

And I thought that these turbos were pretty much out of Mitsu's parts bin.
Actually, and I don't know this to be fact (since I haven't talk to any BMW engineers from the 335i design team) but I read in a few places that the turbos concept was from the parts bin, but the materials from which they are made was not. BMW knew of the heating problems that would occur from such small turbos so they had them made from heat absorbing materials---more heat absorbing than other turbos. I wish I could remember what the material was, it was made out of something, and then sprayed with another layer of something else that further absorbs heat. BMW wants the turbos to go 200,000 miles, and not start blowing up at 90-120 and kill their reputation of building cars that last forever....so they say. Course, an oil cooler would have gone a long way to help with that......hehehehe----I know, that last bit was
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      04-10-2007, 10:25 AM   #35
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Quote:
Originally Posted by BoostedBMW View Post
You might just be seeing them lately (ie. evo 8, 9), but Mitsubishi has been producing turbo cars for a long time over seas, they just never brought them to the US market (there was an evo 1 before there was an evo 8 ). They also produce the turbo's for Greddy/Trust so they are a trusted manufacturer of turbos. Also, they built these turbo's to BMW's specs so I can't see how BMW could make them better if they already made what they wanted. BMW doesn't venture into MB land with SC'ers because they are way less efficient then turbo's are. You are driving a turbo with your exhaust gases, which is essentially waste from the engine, instead of using your crank pulley that leads to a loss to drive the damn thing. Don't even get me started on MB, I think that their SC'd cars drive like crap, the throttle response is horrible... i'm not a fan of their cars in general though. Long story short, Turbo > SC'er.
Don't forget the 3000GT VR-4 (bi or twin turbo, whichever you prefer) and GTX Eclispe (single turbo)...that is dating back to the early and mid 90's
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      04-20-2007, 03:48 PM   #36
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do benz make their own compressor and turbos? i just found out the alpina b7 uses asa superchargers
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      04-20-2007, 04:00 PM   #37
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Quote:
Originally Posted by ch330i View Post
Hmm but who makes better turbos than Mitsubishi. Only lately have i been seeing turbo'd mitsubishi's around here, let alone anywhere. They're on the rise Why doesn't BMW venture in to supercharged land like MB

Mitsu makes really serious turbos and they have been for years! I wish there cars were as good
Why do you think evos and srt4's (some srt4s) go so good!

Forget superchargers they use hp to make hp!
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      04-20-2007, 09:12 PM   #38
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Quote:
Originally Posted by s4iscool View Post
bi is a german thing. no difference.
What I thought all women are Bi inside. I guess I will be looking to find some good porn from Germany.
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      04-23-2007, 08:28 AM   #39
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lol guess nobody knows the turbos manu. for benz...
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      04-23-2007, 02:50 PM   #40
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I believe M-B does design and make their own SC's, as I've seen references to other cars being hot-rodded utilizing Mercedes superchargers. I've also seen references to M-B Eaton S/C's, so perhaps Eaton makes some of them?
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      04-23-2007, 08:17 PM   #41
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eaton? is that a brand?

my conclusion between twin turbo and bi is this please correct if wrong..

twin turbo: can be same size turbos or different but either way turbos alternate boost.

biturbo: same size turbo and both kick in at one time.
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      04-23-2007, 09:13 PM   #42
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Just so you all dont get confused, the turbos were developed by Mitsubishi Heavy Industries not Mitsubishi Motors. World of Difference. I am a ship owner and i have tugs with engines from Caterpillar to Mitsubishi. Mitsubishi was the only engine i did not hae ANY problems with the turbos except for minor problems like the impellar. Its marine grade shiatz. And its helluva lot more torture than anythign else. BMW made the right choice by going with Mitsubishi Heavy Industries as i belive this is the only division so far that have not sacrificed Magenesium Turbines for Titanium Ones. BMW indeed made the right choice. And i reckon no one else make better turbos them them.

Right..PLs comment.
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      04-24-2007, 04:42 PM   #43
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what is difference between the mitsubishi motors and industries? they are both owned by mitsubishi though right?
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      04-24-2007, 09:03 PM   #44
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Quote:
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what is difference between the mitsubishi motors and industries? they are both owned by mitsubishi though right?
Yes they are owned by Mitsubishi. But completely different industry. What i am trying to say is the BMW did not actually make use of Mitsubishi Motorsports division to do the turbos. They used the industrial grade version of the turbos which Mitsubishi did for them specially. Mitsubishi Heravy Inddustries make fantastic offshore engines and their turbos are really quality top notch. I can vouch for that. least of my problems being a tug owner with various engines.
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