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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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      04-07-2007, 10:20 PM   #1
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Post Twin Turbo Vs. Bi-Turbo

what on earth is the difference lol? from my perspective, the twin kicks in at the same time while the bi turbo one blows off earlier other spools and the other kicks in later continuously switching off...

PS: anyone know who makes the superchargers and turbos for benz amg's? one of my friend jokin bout the 335i alot as the turbos are from mitsubisishi calling it rice LOL. he is a friend and i know its a joke but i just wanna know the benz so i can show him up too
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      04-07-2007, 10:33 PM   #2
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Same thing. Twin means two, Bi means two. you are overthinking this one just a little bit homie
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      04-07-2007, 10:36 PM   #3
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The bi is if you want to make a lot of power. A small turbo, then a larger turbo for a lot of boost. BMW uses a bi-turbo in the 335 diesel. The diesel needs tons of boost (26psi) to make decent power verus only 8.5psi of boost for the 335i petrol.
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      04-07-2007, 11:02 PM   #4
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My 2000 Audi S4 was called a bi-turbo.
Don't really see a difference between the Audi bi-turbo and the 335 twin turbo. My Audi stock wise put out less then 10 PSI, total, of boost. Since my Audi was a V6, it had a turbo for each side of 3 cylinders.

The 335 turbos are manufactured by Mitsubishi but they were completed engineered by BMW, I think.

Makes sense to me to have a company that actually produces turbo charged cars make the turbos instead of BMW having to hope to get it right.

And tell your friends that their Benz has plenty of non-german parts in it.
Almost all cars nowadays have parts from all different countries in it. Its all about who can provide the best product for the cheapest nowadays.
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      04-07-2007, 11:05 PM   #5
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When the 335i coupe was first announced, I was talking to a BMW guy at an X-Drive event, and I was severely corrected for calling it a twin turbo. He said it was not a twin turbo, but rather a bi-turbo. It was almost as if I hurt his feelings.

I think they are the same thing.
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      04-07-2007, 11:08 PM   #6
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The window motors for Benz's are made by Hyundai. Tell him his windows are rice.
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      04-07-2007, 11:53 PM   #7
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bi is a german thing. no difference.
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      04-08-2007, 12:12 AM   #8
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Quote:
Originally Posted by PSI Power View Post
The 335 turbos are manufactured by Mitsubishi but they were completed engineered by BMW, I think.

Makes sense to me to have a company that actually produces turbo charged cars make the turbos instead of BMW having to hope to get it right. nowadays.
Will the 335 turbos ever be manufactured by anyone other than Mitsubishi in hopes of further perfecting the beast or producing more horses?
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      04-08-2007, 12:29 AM   #9
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Mitsubishi makes better turbos than bmw. In japan they dont care about big blocks and big engines. It is all about Booosssttt. At this day and age, I would much rather have my turbos be produced by Japs rather than Germans.
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      04-08-2007, 12:34 AM   #10
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Quote:
Originally Posted by IMJUSS2NASTY View Post
Mitsubishi makes better turbos than bmw. In japan they dont care about big blocks and big engines. It is all about Booosssttt. At this day and age, I would much rather have my turbos be produced by Japs rather than Germans.
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
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      04-08-2007, 12:38 AM   #11
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The two vehicles that come to mind when Biturbo is mentioned are the Maserati and the 335i. The term twin turbo has been often given to vehicles that use sequential turbos, a small one for low rpm torque, and a larger one for higher rpms and power. The biturbo system in the 335i uses two equally sized turbos, one fed by cylinders 1-3, and the other by cylinders 4-6. They are not sequential or in series, but in parallel.
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      04-08-2007, 02:44 AM   #12
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There's another thing called sequential turbo charging which is what the OP was also talking about. This sequential turbo charging is in BMW's diesel engines. It consists of two turbos. One smaller sized lower inertia turbo charger for low engine speeds. Then another one is a larger one which spools up at higher engine speeds to provide more boost for more power. The benefit here is that the engine would suffer less from turbo lag in the lower range of the power band with the small turbo providing power initially and then switching to the larger turbo when there is enough 'exhaust power' to spool up the larger turbo. This approach is taken by most manufacturers.

The one in the 335i or the N54 engine take the approach of implementing two small turbos both simultaneously providing boost to the engine. (3 cylinders each) These small turbos should spool up very quickly therefore the driver should experience only very minimal turbo lag.

BTW, bi-turbo and twin turbo has the same meaning.
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      04-08-2007, 03:04 AM   #13
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Quote:
Originally Posted by picus View Post
The window motors for Benz's are made by Hyundai. Tell him his windows are rice.
Hahaha, I remember when I mentioned the turbos on his 335i was made by Mitsubishi he wouldn't believe it but they do make the best turbos!
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      04-08-2007, 08:44 AM   #14
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Quote:
Originally Posted by ch330i View Post
Hmm but who makes better turbos than Mitsubishi.

No one...
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      04-08-2007, 08:57 AM   #15
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no one? how about Garrett.
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      04-08-2007, 09:35 AM   #16
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+1

And I thought that these turbos were pretty much out of Mitsu's parts bin.
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      04-08-2007, 09:41 AM   #17
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Quote:
Originally Posted by tctic View Post
There's another thing called sequential turbo charging which is what the OP was also talking about.
This is what Toyota implemented on the Supra in the 90's.
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      04-08-2007, 09:50 AM   #18
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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.
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      04-08-2007, 10:05 AM   #19
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Quote:
Originally Posted by E90330iS View Post
Hahaha, I remember when I mentioned the turbos on his 335i was made by Mitsubishi he wouldn't believe it but they do make the best turbos!
Correct, Mitsubishi engineering makes the 335i turbos

But they also make the turbo for the 320d, which had MANY MANY turbo failures , especially in the E46.

Interestingly the new turbo diesel 4 cylinders as found in the facelift 1 Series and soon the 3 Series have their new vastly improved and state of the art turbos made by Borg-warner
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      04-08-2007, 10:56 PM   #20
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so the turbo setup on bi and twin turbo are the same? it is just the name that is altered? so no bs about this one spoolin first on the bi while twin is simotanuously?

any idea who makes the benz superchargers and turbos?
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      04-08-2007, 11:23 PM   #21
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twin is usually referring to the sequential turbos... bi is usually two equal size parallel turbos. I think it doesn't really matter. bi means it's got 2, twin means two... japanese cars would advertise 'twin sequential' and point out the sequential part. whatever you call it, it's the same 'fast'
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      04-09-2007, 01:58 PM   #22
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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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