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Discussion Starter · #1 ·
As the title says anyone done it? It's done 102k miles so i'm beginning to save my money for it lol.

what bhp gain can you get out of a new turbo without putting the engine etc under too much stress.
 

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Discussion Starter · #3 ·
I don't suppose that you know anyone i can contact, most i have contacted already do not do decent uprated turbo's.

Many Thanks.
 

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It wont be as simple as just slapping on a bigger turbo and getting more power instantly.

You need to work out what you want from the car ie more power or better response. A bigger turbo on its own will likely not improve the power and the response will suffer due to increased turbo lag.

In order to get more power from a bigger turbo you will need to up the boost level - how will you do that?

Upping the boost will mean the car needs to flow more fuel so it doesn't run lean which will cause det so how much more fuel will your injectors flow before the reach their max duty cycle? Remember its unwise to run them much past 80% duty cycle, this leave you a safety buffer.

What will you do with the ecu? You will somehow need to get it to put more fuel through the injectors - will a remap suffice or will it need a piggyback or even a replacement EMS?

Will your engines internals i.e. rods and pistons be able to handle the increased temperatures and pressures caused by upping the boost or will they have to be replaced with forged items?

By the way I have no idea what the solutions to these questions are on a BMW but they are some of the things that you will need to think about before you shell out your "hard earned" on a new turbo.

HTH
Mark
 

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No 1: diesel's dont det, they are also very strong & can handle huge boost, about the only thing that kills a diesel is exhaust gas temps. BUT most deisels are set up to run lean to help reduice smoke/emissions so will need bigger injectors & some kind of piggyback/stand alone ecu! for BIG power increace. not many people deal with diesel tuning past a re-map, did some research into this a while ago when the turbo needed replacing on my mated L200 he wanted more power but the cost of engine management put him off and he went for standard replacement and a remap & de-cat for a little more power.
 
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