[Kjaerulff]

Hey guys,

I just flashed my 435i with MHD stage 2 (tried Stage 1 and was disappointed with the result so gave Stage 2 a go) and I am experiencing really subpar performance.

Before giving MHD a go I was running an off the shelf map giving me 360hp/550nm - and wanted the features of MHD.

My dragy 0-100kmh times dropped an entire second when doing this from 5.1 to 4.1.

I’ve contacted MHD but was wondering if anyone here can see what could be wrong?

Running 100 octane Shell Vpower fuel
Stock IC and Stock down pipe
BMS open air filter and alu charge pipe

Log:
https://datazap.me/u/kjaerulff/435i-...og=0&data=3-13

Dragy links:
https://ibb.co/x1KgjR2
https://ibb.co/Byfdxv4

Appreciate it guys

[thejeremyman9]

What tune were you running before? Do you have a log from that?

You shouldnt be running stage 2 without an IC. Really shouldnt even do stage 1. Your 100 octane is helping your timing but you are no doubt losing power with IATs skyrocketing to 140F. Boost is also quite a bit below target in 3rd gear for some reason.

[Kjaerulff]

Originally Posted by thejeremyman9

What tune were you running before? Do you have a log from that?

You shouldnt be running stage 2 without an IC. Really shouldnt even do stage 1. Your 100 octane is helping your timing but you are no doubt losing power with IATs skyrocketing to 140F. Boost is also quite a bit below target in 3rd gear for some reason.

An off the shelf map made by a Danish tuner called Landberg!


Constantly monitoring my iAT and max I’ve seen is 105F, mostly quite below. But you’re right I was simply testing to see if I’d feel any power like I expected with stage 2; but just feels super slow…. Flashing back to Stage 1 later today!

[thejeremyman9]

Originally Posted by Kjaerulff

An off the shelf map made by a Danish tuner called Landberg!


Constantly monitoring my iAT and max I’ve seen is 105F, mostly quite below. But you’re right I was simply testing to see if I’d feel any power like I expected with stage 2; but just feels super slow…. Flashing back to Stage 1 later today!

Now that you have the MHD monitoring capabilities, you can flash back to the tune you had previously from the danish tuner and you can log it with MHD. You dont have to be running a MHD tune to log with MHD. Post that log and it should explain why there might be a power difference.

[Kjaerulff]

Originally Posted by thejeremyman9

Now that you have the MHD monitoring capabilities, you can flash back to the tune you had previously from the danish tuner and you can log it with MHD. You dont have to be running a MHD tune to log with MHD. Post that log and it should explain why there might be a power difference.

I wasn’t smart enough to make a backup! 😅

[Kjaerulff]

Wait; does flashing with xHP overwrite MHD?

[thejeremyman9]

Originally Posted by Kjaerulff

I wasn’t smart enough to make a backup! 😅

flash back to stock through MHD should reinstall whatever tune you had on the car before you installed MHD.

And no XHP doesnt flash the DME, XHP is a transmission tune

[chinniciF32]

Originally Posted by Kjaerulff

Wait; does flashing with xHP overwrite MHD?

MHD flashes the DME and XHP flashes the TCU which is separate so no it doesn't overwrite MHD infact you can pair it with MHD and the next time you flash after you install XHP theres an option in the MHD settings to Flash your car with XHP installed.

[Kjaerulff]

Alright still trying to get my old tune file for testing; but wondering if the MHD log indicates any problems with my car?

Flashed back to MHD Stage 1 an now gettin 5.4-5.5s times 0-100kph, which is slower than stock 🧐

[harkes]

Originally Posted by thejeremyman9

What tune were you running before? Do you have a log from that?

You shouldnt be running stage 2 without an IC. Really shouldnt even do stage 1. Your 100 octane is helping your timing but you are no doubt losing power with IATs skyrocketing to 140F. Boost is also quite a bit below target in 3rd gear for some reason.

3rd gear probably that low because Commanded WGDC was also used for these OTS maps as discussed in another thread.

[harkes]

Try to load the Stage2 93oct map. All that timing correction is hurting performance more than running a little lower and consistent timing.

[Kjaerulff]

Originally Posted by harkes

Try to load the Stage2 93oct map. All that timing correction is hurting performance more than running a little lower and consistent timing.

Despite running 100octane fuel? Some insights would be massively appreciated. I’d love to understand why you suggest this

[harkes]

Originally Posted by Kjaerulff

Despite running 100octane fuel? Some insights would be massively appreciated. I’d love to understand why you suggest this

Running a higher octane than your tune is designed for should mean you will never see timing correction (theoretically). You will only get problems running lower octane than a tune is designed for.

Having more beer than you can drink = good. Having less =

[thejeremyman9]

Originally Posted by Kjaerulff

Despite running 100octane fuel? Some insights would be massively appreciated. I’d love to understand why you suggest this

The problem is your IC man. You absolutely should not be running these tunes without an IC. Your IATs go over 140F which not only hurts performance directly due to the air temp but its causing timing corrections even though your fuel octane is far higher than the map octane. You can only support like 5 degrees of timing.

[harkes]

Originally Posted by thejeremyman9

The problem is your IC man. You absolutely should not be running these tunes without an IC. Your IATs go over 140F which not only hurts performance directly due to the air temp but its causing timing corrections even though your fuel octane is far higher than the map octane. You can only support like 5 degrees of timing.

Air temp alone should not be causing ign corrections as there are tabels to correct target based on air temp.

As I remember he is running a 102RON map on 100RON, hence I recommended him to run the 98RON map instead.

[n55david]

Originally Posted by harkes

Air temp alone should not be causing ign corrections as there are tabels to correct target based on air temp.

As I remember he is running a 102RON map on 100RON, hence I recommended him to run the 98RON map instead.

Actually it can.. it will cause detonation 100%

[thejeremyman9]

Originally Posted by harkes

Air temp alone should not be causing ign corrections as there are tabels to correct target based on air temp.

As I remember he is running a 102RON map on 100RON, hence I recommended him to run the 98RON map instead.

He is running 100 octane fuel on a 95 octane map so his fuel is way higher than the map. I am not sure about the tune actually reducing timing targets based on IAT but it didnt look like it. The high air temp is also directly reducing power.

[AmuroRay]

Originally Posted by thejeremyman9

He is running 100 octane fuel on a 95 octane map so his fuel is way higher than the map. I am not sure about the tune actually reducing timing targets based on IAT but it didnt look like it. The high air temp is also directly reducing power.

The tunes should and would do that. My car (load based) with drop targets with high IATs - but obviously try to make power elsewhere, like more boost.

He needs an Intercooler. Period.

[harkes]

Originally Posted by thejeremyman9

He is running 100 octane fuel on a 95 octane map so his fuel is way higher than the map. I am not sure about the tune actually reducing timing targets based on IAT but it didnt look like it. The high air temp is also directly reducing power.

Yes 100RON fuel (we use RON in Denmark) on a 95AKI/102RON map

[dangerus_car]

I don’t understand why people are buying tune first instead of hardware. It’s like buying a fillet mignon raw steak but have no bbq grill to cook it, how are you going to enjoy that fine steak?

I support being cheap, but please do it with risk management. Do you want to blow up your car just with tune without proper hardware?

[Kjaerulff]

Thanks for all the feedback! Intercooler ordered; Wagner EVO 2.

Tried running 93oct maps and had no timing corrections; still bad performance.


I guess in the end I don’t fully understand why my old tune (360hp/550nm) could easily give me good performance with no upgraded FMIC; but with MHD I need one to get good performance! Oh well - looking forward for the IC upgrade!

I also ordered a custom tune for the car which will happen in a month from now; will update on results of both MHD tune with better FMIC and then the result of the custom tune

[AmuroRay]

Originally Posted by Kjaerulff

Thanks for all the feedback! Intercooler ordered; Wagner EVO 2.

Tried running 93oct maps and had no timing corrections; still bad performance.


I guess in the end I don’t fully understand why my old tune (360hp/550nm) could easily give me good performance with no upgraded FMIC; but with MHD I need one to get good performance! Oh well - looking forward for the IC upgrade!

I also ordered a custom tune for the car which will happen in a month from now; will update on results of both MHD tune with better FMIC and then the result of the custom tune

You overspent on a subpar Intercooler. I would cancel that order and get something better like a CSF or (Better still) VRSF..