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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 > Stick with Cobb or change to JB4/MHD with Hybrids.



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      08-22-2015, 06:45 PM   #1
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Stick with Cobb or change to JB4/MHD with Hybrids.

I am getting ready to switch from stock turbos to Pure N54 turbos and I am really unsure about what I should do with my tune. I have been very happy with Cobb and custom tunes from Wedge and PTF. However, I continue to read on this form and others that I will need more boost control with hybrids which JB4 is supposed to do better than Cobb. I have a Z4 DCT and I am also concerned that I don't slip my clutch.

I would love to hear some opinions.
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      08-22-2015, 06:59 PM   #2
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Wedge does the mhd tunes, so if youre using the same tuner with better capabilities, why wouldn't mhd be the clear choice?
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      08-22-2015, 08:05 PM   #3
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I'm running VTT Stage 2+ turbos on my 135i and I'm still on Cobb. I'll be switching to MHD with Dzenno once I get to the point where 21ish psi isn't enough. If you're happy with 21psi or less, I personally don't see the need to switch. If you want more than that, then MHD + Maxboost is a pretty good flash only option.
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      08-22-2015, 08:17 PM   #4
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I have the BMS n20 TMAP to go over 21psi if needed. I have been very happy with my flash tunes so I guess that I will stick with Cobb or MHD.
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      08-22-2015, 08:19 PM   #5
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I'm stuck in the same boat. Looking to run an e50 custom tune with wedge via Cobb but all this MHD talk is making me second guess. I don't wanna push my stockers past 18-19psi. So does that mean it's not worth the switch either ?
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      08-22-2015, 08:57 PM   #6
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I'd talk to Dimitry (BuraQ) before you do anything. He knows the DCT better than anyone.
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      08-24-2015, 07:42 AM   #7
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Quote:
Originally Posted by Lambobimmer View Post
I have the BMS n20 TMAP to go over 21psi if needed. I have been very happy with my flash tunes so I guess that I will stick with Cobb or MHD.
The DME will still be limited to around 22.5 with the n20 sensor, instead of 21.5 without.

The MAXBoost device from WedgePerformance allows tuning above 22.5 psi with MHD, while still letting the DME handle the boost.
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      08-25-2015, 09:02 PM   #8
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Quote:
Originally Posted by MHD Tuning View Post
The DME will still be limited to around 22.5 with the n20 sensor, instead of 21.5 without.

The MAXBoost device from WedgePerformance allows tuning above 22.5 psi with MHD, while still letting the DME handle the boost.
Interesting. I found the link for the MAXBoost device and it answered some of my questions.

Does MHD support IMEOS?

Last edited by Lambobimmer; 08-25-2015 at 09:13 PM.
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      08-27-2015, 03:23 AM   #9
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Quote:
Originally Posted by Lambobimmer View Post
Interesting. I found the link for the MAXBoost device and it answered some of my questions.
Does MHD support IMEOS?
When tuning, the latest firmware version for each car (ina0s for z4/335is, ikm0s for 1M, i8a0s/iej0s for all others) is always used. You can flash back to stock to an older firmware version if you performed an ECU backup.
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      08-27-2015, 05:15 AM   #10
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Quote:
Originally Posted by MHD Tuning View Post
When tuning, the latest firmware version for each car (ina0s for z4/335is, ikm0s for 1M, i8a0s/iej0s for all others) is always used. You can flash back to stock to an older firmware version if you performed an ECU backup.
I updated to i8a0s a couple of years ago at my dealership and when doing it, I opted for the "wastegate valve conversion" a.k.a wastegate retrofit. Do you know if the wastegate retrofit for the early cars is a part of the firmware, in which case those with the retrofit done are better of sticking with their own backed up retrofit-version of the firmware?
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      08-28-2015, 07:58 AM   #11
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Quote:
Originally Posted by jippii ensio View Post
I updated to i8a0s a couple of years ago at my dealership and when doing it, I opted for the "wastegate valve conversion" a.k.a wastegate retrofit. Do you know if the wastegate retrofit for the early cars is a part of the firmware, in which case those with the retrofit done are better of sticking with their own backed up retrofit-version of the firmware?
jyamona
If you have the wastegates retrofix, it will be kept when flashing a MHD OTS mpa (stage 0, 1etc).

But you can still override the behavior with the MHD progressive rattle fix option.
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