N54Tech.com - International Turbo Racing Discussion
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Sonne Sonne is offline
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Car: BMW 335i coupe
Default upgrading turbos help - 05-01-2019, 03:06 PM

Hey everyone,

I've got rattle and my wastegates can't hold boost for long. Getting the over boost error. EVERYTHING is checked, so it must be these.
Anyway, i decided i wanna get new turbos.

I'm thinking about buying these:

https://www.hm-turbotechnik.com/bmw/...i-n54-biturbo/

There no direct link, but its the HM540 i wanna buy.

My question here is:

Could I have these optimized turbos installed and run map 2 and see a difference in performance? Or would I have to get someone to help me play around with map6?
My guess is that when the turbo has better flow, the map2 will make more power than with the OEM ones?

Can someone tell if that's right or wrong?

And... does someone have experience with these turbos?

Thanks in advance!


BMW 335 e92 '07

Upgrades:
JB4
BMS open filters
7" FMIC
Chargepipe
Non-catted deepee's

Always running 100 octane
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tisdrew tisdrew is offline
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Car: 2009 e90 335i 6MT
Default 05-02-2019, 07:49 AM

I heard these topped out at like 500whp and like maybe hit 600 pushing them with race gas. Why not go with vtt 2's or something? Unless you're in europe, getting any warranty work done is going to be a pita and honestly I don't know much about these.

Whenever someone asks for upgraded turbos I just tell them to go with Pure.
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Sonne Sonne is offline
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Posts: 30
Join Date: Jul 2018
Car: BMW 335i coupe
Default 05-02-2019, 08:07 AM

Yeah and I'm in Europe and the pure stage 2 are a bit too expensive for me. I'll be happy with 500bhp.

Do you know how it works with the Jb4? Do I have to create a custom map 6 or will the turbos be effective and bring me more power by just continuing to run on a preprogrammed map?


BMW 335 e92 '07

Upgrades:
JB4
BMS open filters
7" FMIC
Chargepipe
Non-catted deepee's

Always running 100 octane
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tisdrew tisdrew is offline
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Posts: 23
Join Date: Mar 2017
Car: 2009 e90 335i 6MT
Default 05-02-2019, 08:10 AM

Hire a well-respected and known BMW tuner.
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kipitrl kipitrl is offline
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Join Date: Jan 2018
Car: BMW 335I
Default 05-15-2019, 06:30 PM

Im using Trebila and happy with communication and advise so far. Custom tune in progress...
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