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      10-30-2019, 02:42 PM   #1651
6ixSpd
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If only MHD allowed a "stage 0" tune for preventing the catless CEL. I have no desire for more boost, but I want downpipes for the sound
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      10-31-2019, 06:34 PM   #1652
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Quote:
Originally Posted by Wegz View Post
Does this work with the 2013 yet? Looking for more power out of my car, currently dinan stage 2 flash and BMW perf exhaust. Can I back up my Dinan tune and restore it if I dont like MHD?
Yes, but your DME has to be unlocked. Justin @ Twisted Tuning provides this service with a quick turnaround time.

https://twistedtuning.com/products/l...ies-dme-unlock


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Originally Posted by 6ixSpd View Post
If only MHD allowed a "stage 0" tune for preventing the catless CEL. I have no desire for more boost, but I want downpipes for the sound
There is a stage 0. You need the Flasher License though.
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      11-07-2019, 01:47 AM   #1653
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2011 135i  [5.00]
MHD Tuning , Twisted Tuning, @anyone els that can help.

In this thread in the California sub forum https://www.1addicts.com/forums/show...6#post25431986 there are a few people that failed smog even though MHD was removed from the vehicle. Some people have heard it is due to a mismatch in check sums which can be seen after flashing the dme.

Is the non matching checksum the reason for the error showing up during smog? How can can we make them match?

Thanks
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      11-13-2019, 11:14 AM   #1654
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Helping a friend out with his E-series N55. MHD Tuning Twisted Tuning

Flashed MHD Stage 2 (95 Ron) and the car feels significantly slower than stock afterwards. Only code present was a "32C9 - Poor road surface detection" which I assume is unrelated as it has yet to come back...which I found quite odd considering how dead it feels.

Car was flashed via a cable I've used many times on my own cars, but with a USB-A to USB-C converter so he can use his Huawei phone...not sure if this is perhaps relevant.

P.S. I realize logs would be an advantage but I'm just checking if anyone has perhaps encountered the same issue and found it to be related to something going wrong during the flash process? If not I will insist he buy the monitor module and run some logs with him.

P.P.S. Flashed it back to stock afterwards (full flash) and still feels dead. It seems,to me at least, that something happened during the flash that has screwed something or other up.
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      11-15-2019, 07:26 PM   #1655
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Hey there fellas, Is one of you geniuses able to check out my log.

Car was feeling slow so I thought there was a boost leak, not too sure maybe something else it wrong?

This was a 3rd gear pull.

Info on car DCT 98RON Stage 2+

Here's my datalog from MHD, hopefully I've done it right.
https://datazap.me/u/matankau/data-3?log=0&data=4-20

Would appreciate it alot of someone could let me know if the car is running normally.

Thanks in advanced fellas

Last edited by MatanKau; 11-15-2019 at 07:31 PM..
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      12-02-2019, 09:16 AM   #1656
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Hey all,

I have a question about MHD logging on the N55 platform. I noticed that when my car is idling boost PSI is reading either 0 or 0.1 is this normal, or do I have a vacuum leak/wastegate issue? I know other platforms tend to show vacuum pressure via negative PSI on the boost gauge (typically around -14 PSI), and have even seen negative PSI readings on the MHD logger on N54s.

Is this normal for logging on the N55 or do I have a legitimate issue? I recently tested for and fixed any boost leaks (to my knowledge) so this is puzzling.

Thanks
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      12-02-2019, 04:38 PM   #1657
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Quote:
Originally Posted by ghost135i View Post
Hey all,

I have a question about MHD logging on the N55 platform. I noticed that when my car is idling boost PSI is reading either 0 or 0.1 is this normal, or do I have a vacuum leak/wastegate issue? I know other platforms tend to show vacuum pressure via negative PSI on the boost gauge (typically around -14 PSI), and have even seen negative PSI readings on the MHD logger on N54s.

Is this normal for logging on the N55 or do I have a legitimate issue? I recently tested for and fixed any boost leaks (to my knowledge) so this is puzzling.

Thanks
I've noticed the same thing too and assume it's normal. The N55 added valvetronic variable valve lift and duration control which can take care of the throttling of the engine instead of a typical butterfly throttle plate (N55's still have a traditional throttle as well as a safety measure). Now this is just an educated guess on my part, but I assume that because of this system, the throttle plate can stay fully open even at idle, which means that the intake manifold pressure should be almost equal to atmospheric pressure, or 0 PSI-gauge. This is likely done for 2 reasons:
1. Efficiency - pressure losses across the throttle are an area of inefficiency in gasoline engines. Throttling with the intake valves is a more efficient way of controlling airflow.
2. Transient response - With the intake manifold already at or near ambient pressure during low-load/cruising, it will likely take less time to reach target boost pressure than an engine that is starting with a vacuum in the intake. i.e. going from 0 to 10 psi can happen faster than going from -10 to 10 psi. Just spitballing here, but this may have been another part of the justification to go from twin to single turbo between the N54 and N55.

Other platforms that use a throttle plate for airflow control at idle (including N54's) will have a negative pressure in the intake manifold as you've seen before.
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