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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > MHD N55 E-Series - general discussion



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      03-29-2020, 03:37 PM   #8427
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In a nutshell, why won't the MHD OTS maps work properly with a PS2?
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      03-29-2020, 08:14 PM   #8428
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In a nutshell, why won't the MHD OTS maps work properly with a PS2?
They're designed for the stock turbo which is much different than the PS2.
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      03-29-2020, 08:50 PM   #8429
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In a nutshell, why won't the MHD OTS maps work properly with a PS2?
They're designed for the stock turbo which is much different than the PS2.
Say you were running stage 2+ FBO on a stock turbo and then just upgraded to a PS2, wouldn't it just be easier for the PS2 to make the same boost without closing the wastegate as much?
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      03-29-2020, 08:51 PM   #8430
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Originally Posted by Lush335 View Post
In a nutshell, why won't the MHD OTS maps work properly with a PS2?
Stock turbos have a narrower powerband than the ps2s, so if you use an OTS tune meant for stock turbos, you will lose out on power from 6000k to redline.
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      03-30-2020, 06:05 PM   #8431
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Quote:
Originally Posted by Lush335 View Post
In a nutshell, why won't the MHD OTS maps work properly with a PS2?
Stock turbos have a narrower powerband than the ps2s, so if you use an OTS tune meant for stock turbos, you will lose out on power from 6000k to redline.
Will everything still work properly though or will the DME still try and push the PS2 harder than it should because it still thinks it has the small stock turbo? Sorry if these are noob questions but trying to figure some stuff out.
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      03-30-2020, 09:02 PM   #8432
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Quote:
Originally Posted by Lush335 View Post
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Originally Posted by CoffeeBean View Post
Quote:
Originally Posted by Lush335 View Post
In a nutshell, why won't the MHD OTS maps work properly with a PS2?
They're designed for the stock turbo which is much different than the PS2.
Say you were running stage 2+ FBO on a stock turbo and then just upgraded to a PS2, wouldn't it just be easier for the PS2 to make the same boost without closing the wastegate as much?
I couldn't tell you exactly what would happen, but it definitely wouldn't be good. There's so much more to it than I think you realize. This might help: https://www.enginelabs.com/engine-te...-turbocharger/

18 psi from the stock turbo is a lot different than 18 from a PS2. The F series has a separate PS2 OTS map, but unfortunately we don't.
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      03-30-2020, 09:54 PM   #8433
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Quote:
Originally Posted by Lush335 View Post
Will everything still work properly though or will the DME still try and push the PS2 harder than it should because it still thinks it has the small stock turbo? Sorry if these are noob questions but trying to figure some stuff out.
I don't think I know the full answer to this, but I have seen other forum members run an OTS map as a placeholder waiting for a custom tune. I think you should be okay because MHD tunes based on target engine load, not target boost, so it'll just be an unoptimized tune (missing out on 6k to redline), but you should let more experienced members chime in.
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      Yesterday, 01:12 AM   #8434
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Anyone experience this with the new map update?

Flashed the 1.6 map and upped from 1+ to 2+. Put about 250km on the car since then, everything feels good except for a slight throttle oscillation when cruising between 100km/h -120km/h.

It happened twice under these conditions:
If Iím on flat ground (100+km/h) holding throttle input steady, the car feels like itís almost choking (loss in power) and itíll keep choking until you add or release throttle - Iíll try logging it next time Iím on the highway.

Not the end of the world, just curious if itís my car or if someone else has felt the same.
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