MHD single turbo boost control DIY | how to

How to set up your car for MHD 3/4 port Mac solenoid control.

[@jumpmanadam1536]

N54 Goat

[@Bertof30]

Thank you so much

[@NikkoCruz1]

If I were to do this on the B58, would I connect to the EWG actuator plug? Going big single and I'm still not understanding how the reflex+ would open and close the external wastegate lol

[@VcN54King]

Do you need to return it if it'd already tuned for single Turbo to do this?

[@lucasrobison99]

Is this still the best way for boost control or is motiv?

[@aaronph8605]

Thank you for this video. Where can I find the directions for this? I checked the MHD site but didn't see any there.

[@aaronph8605]

Nevermind. Found it on a forum just to find out the warning is on the app.. LOL 😅

[@ivanr2191]

How would I do it if I already have a 3 port Mac solonoid and a boost controller?

[@nocrewrambof2267]

Would i still be able to use if I have jb4 installed too ?? Was planning on doing a MHD bef w/ jb4 .

[@cd919performance3]

No required to do this if you use Jb4

[@N54SZN]

What if you are currently using motiv reflex+ for boost control would there be any gain switching too mhd for boost control (single turbo)

[@cd919performance3]

Both work the same.

[@JamesDean-rx6wy]

​@CD919 Performance If using reflex+, and AUX1 wired straight to MAC valve and other wire to switched 12v. Do you still need to swap PIN 7 to PIN 25? Thank-You Sir!

[@romierome6286]

@@cd919performance3 I have the same question james is asking?

[@slowbmw335is5]

@@JamesDean-rx6wyever figure this out

[@240Luver]

So if you have the plug and play one you don’t need to repin right?

[@cd919performance3]

You have to re pin no matter what.

[@FLTHY4N]

What if you’re using ReFlex+? What wiring needs to be done?

[@cd919performance3]

If using reflex+ to control boost, then this does not need to be done.

[@nicholaspoyle8411]

Where are the vacuum lines on the Mac solenoid connecting to?

[@geo335st]

Either the turbo compressor housing or you can tap the intake manifold

[@nicholaspoyle8411]

@@geo335st thanks bro I got my vacuum source by putting a t fitting from the line that goes to manifold to bov

[@geo335st]

@@nicholaspoyle8411 yup that works!

[@zglgo]

Planning to go Single Turbo next summer. Just doing as much research as I can. Just to confirm as long as you do the repin for the ECU and have a mac solenoid to the stock solenoid plug, you would not need to have a boost controller and be able to control boost with just MHD/custom tune?

[@jameswarren3020]

Good question, look forward to seeing what conclusions are drawn. Also trying to avoid having to use Jb4 and back end MHD flash tune.

[@Rvssvlle90]

Correct

[@cd919performance3]

You will not need an additional boost controller. The factory ECU controls boost.

[@azatranzport1117]

So are you able to adjust the mhd boost level or is it one setting

[@Bmw_doc_pl]

one setting, to adjust u need gfb or any other controller

[@geo335st]

Depends on your tune and target load. If you want to increase on the fly then you would need a gfb or mbc

[@donwingchun]

Incorrect, you control precise boost and WGDC percent direct from DME to MAC, you don't use a boost controller@@Bmw_doc_pl

[@cd919performance3]

MHD allows 4 map slots, so you could have 4 different boost target maps that you can change on the fly. These maps can target whatever boost you want. Throw all EBC/MBC in the trash.

[@xXspark365Xx]

So now tuner can control boost like on twins?

[@geo335st]

Yes if you don't have an electronic or manual boost controller or a JB4

[@Slo_N54]

What does that do when you pull the pin out of the dme

[@jakej86]

How is the boost read/monitored in MHD?

[@cd919performance3]

Same as it is on twins.

[@jakej86]

@@cd919performance3 Ok cool. Appreciate it

[@chrisbmw30]

Is converting to single bank fueling necessary to run MHD boost control ?

[@cd919performance3]

No you do not.

[@chrisbmw30]

What’s your email? My tuner told me you could not. Now I’m genuinely confused 🙃

[@emmanuelessane1667]

Can we use it with JB4 ?

[@geo335st]

You don't need this if you have JB4 since it controls your boost with the MAC solenoid when you update to the single turbo firmware

[@tayagio28]

I need custom turning even if i have mhd

[@reallife386]

does the 4 port mac work the same

[@cd919performance3]

Yes

[@getrichordiesliming]

what's better this or gfb?

[@brendanlogan8798]

This

[@geo335st]

I think if you want to increase or decrease your boost on the fly then a combo of both would be best

[@Dr47godamnit]

I went on limp mode

[@pvtpelnar11]

How much is your tune for single turbo n54 and do you tune with jb4

[@geo335st]

His prices are very reasonable but I don't know if he tunes with JB4. But all in all he is a reputable tuner among the N54 community.

[@pvtpelnar11]

@@geo335st yeah I know that but I'm using doc vu and he likes the jb4 so that's what I'm sticking with

[@geo335st]

@@pvtpelnar11 yeah doc vu is good too. You can't go wrong with either one. But I do know some tuners don't tune with JB4

[@pvtpelnar11]

@@geo335st yeah you're right about that wedge performance. Wouldn't touch mine

[@geo335st]

@@pvtpelnar11 yeah wedge created MHD so yeah no JB4 lol

[@kevinhuynh303]

You the one tuning my car pops hehe @2mm_4L