how proven is MHD flash tuning for n54?

[usmcgruntz]

Originally Posted by Johnnyblaze535i

I saw another post about options. I seem to have have miss fires and cant even get this dam thing to get out of 3rd gear. I can feel the power just awaiting to unleash... What options did you install... I have 08 535i E60

I dont went the loud burble but want as much power as possible

I just did a Mhd tune and the next day I got constant misfires.

I replaced the coil pack for cylinder 2 and it fixed the misfire. Also got a brand new set for the rest plus new plugs on the way. I didn’t know this. Lol. Anything else I should replace that is a common failure or things I should know?

[MRCW]

The higher the stage tune the more you should modify. I have the stage 1 installed with no upgrades other than plugs and coils...

The more boost/ power, thy more upgrades are needed such as FMIC, exhaust etc... lots of info here and other boards

[B21]

Originally Posted by usmcgruntz

I just did a Mhd tune and the next day I got constant misfires.

I replaced the coil pack for cylinder 2 and it fixed the misfire. Also got a brand new set for the rest plus new plugs on the way. I didn’t know this. Lol. Anything else I should replace that is a common failure or things I should know?

Plugs n coils are relatively obvious and the cost benefit straight forward…after that it’s as other day a mixture of a lot of money for relatively trivial gains ..but…the more you push the greater,likelihood of other things starting to give..on an E89 35i…fuel pumps, injectors, turbos….but as long as you realise that and tackle the issues as and when they arrive you’ll be fine..

[Y888]

Originally Posted by MRCW

The higher the stage tune the more you should modify. I have the stage 1 installed with no upgrades other than plugs and coils...

The more boost/ power, thy more upgrades are needed such as FMIC, exhaust etc... lots of info here and other boards

any high temp issues with stage 1?
wondering should i wait for fmic and downpipes before i flash mhd

[B21]

Originally Posted by Y888

any high temp issues with stage 1?
wondering should i wait for fmic and downpipes before i flash mhd

No net effect on cooling…if you’re concerned ask MHD to run coolant in sport mode or track mode..

Depending where you live than a decent FMIC may help performance/knock control a bit or if it’s really hot where you are +35c then quite a lot..

[MRCW]

Originally Posted by Y888

any high temp issues with stage 1?
wondering should i wait for fmic and downpipes before i flash mhd

I'm in Florida and this is just a weekend driver. No overheat issues...i have an X1 35i that I'm getting light track ready with an N55 and tune. I'm adding allot of bolt ons...

[usmcgruntz]

I got a tune and the transmission started giving me a phase black code and missing a shift in comfort mode after a MHD tune. BMW recommended me take the tune off because it can confuse the computer. I contacted MHD but they said it’s not because of the tune.

[B21]

Originally Posted by usmcgruntz

I got a tune and the transmission started giving me a phase black code and missing a shift in comfort mode after a MHD tune. BMW recommended me take the tune off because it can confuse the computer. I contacted MHD but they said it’s not because of the tune.

Almost always what’s actually happening is there is an underlying steady deterioration in coils/plugs/injectors which are then exacerbated / precipitated by the burden of the tune…

Happens quite often given 10+ year old cars 50k+ miles dubious maintenance history etc

Probably got a leaking gearbox..

[usmcgruntz]

Originally Posted by B21

Almost always what’s actually happening is there is an underlying steady deterioration in coils/plugs/injectors which are then exacerbated / precipitated by the burden of the tune…

Happens quite often given 10+ year old cars 50k+ miles dubious maintenance history etc

Probably got a leaking gearbox..

Took it to Bmw. Said the transmission fluid level is fine and was at normal levels.

[B21]

Originally Posted by usmcgruntz

Took it to Bmw. Said the transmission fluid level is fine and was at normal levels.

Well something must be astray with your gearbox..100s if not thousands of N54 MHD tunes..no empirical evidence to suggest the marriage of MHD OTS tune with Getrag DCT causes issues..

The only other logical explanation is somebody did a duff tune using MHD which is more than possible…