Flashing MHD tune today and have a couple questions.

Slim415 · 05-31-2020, 04:44 PM

Quote:

Originally Posted by E92only

I'm only speculating here without your logs, but it could likely be your IATs. My car would do the same before I got an intercooler.

Well it's a good thing I have a VRSF FMIC ordered :]

Slim415 · 05-31-2020, 04:48 PM

Quote:

Originally Posted by Smgs1992

If its dying off around 5500-6000rpm that is completely normal as that's where the stock turbos die off. It's much less noticeable until you tune the car. Simply shift sooner and it shouldn't be a problem.

Really? I thought that's where you get most of the power in that range. Why would the turbos die off that soon, and wouldn't the tune bring more power into that higher RPM range as an improvement? Seems kind of an odd engineering design.

Bimmer_Engineer · 05-31-2020, 05:32 PM

Quote:

Originally Posted by Slim415

Really? I thought that's where you get most of the power in that range. Why would the turbos die off that soon, and wouldn't the tune bring more power into that higher RPM range as an improvement? Seems kind of an odd engineering design.

The stock turbos don’t have the volumetric throughput to keep up with the air needs of an engine running a tune...

Smgs1992 · 05-31-2020, 08:11 PM

Quote:

Originally Posted by Slim415

Really? I thought that's where you get most of the power in that range. Why would the turbos die off that soon, and wouldn't the tune bring more power into that higher RPM range as an improvement? Seems kind of an odd engineering design.

The stock turbos are rather small and it's pretty common in general for newer turbo cars to use tiny turbos. They're designed to produce low end torque and offer punchy driveability which means it sacrifices on the top end.
It is what allows the N54 stock to produce 300ft lbs of torque at 1400rpm.
Short shift around 6k and you'll be fine. The upgraded twins pull to redline and inlets can help some too even on stock turbos.

type-dRew · 05-31-2020, 08:20 PM

Linear throttle is definitely the move, just feels like cable throttle. Feels how it should, not fake huge throttle blade openings at next ti no throttle.

My car was jumpy at tip in, pulling away from a light cleanly was aggravating at best.

That being said, I didn't like it before my trans tune from Rod Sutphin, but with it, it's perfect. I think it's how he programs the torque converter that makes it considerably better matched than xhp ots.

Quote:

Originally Posted by mweisdorfer

Quote:

Originally Posted by Slim415

1) Should I go with the V.9 beta or V.8 maps?

2) Can I do stage 2+ with DP's but no FMIC? I ordered a VRSF FMIC and it will ship mid June. Will it be okay till then or should I just get stage 2 and then purchase the 2+ map in a few weeks when I get the FMIC?

3) When using the battery charger should it be in boost or trickle mode?

4) For the "OEM/catted DP's" I do not check this since I'm using catless DPs correct.

5) What should I set "coolant target at?

6) Linear throttle mapping good or not?

I personally don't flash anything unless my car is on a battery charger. It's not worth taking the chance of bricking the DME. True, the 2 min flash probably won't do this in all likelihood. Just make sure your battery is in great condition. Remember, the DME is hyper sensitive and doesn't like voltage below 14.5, when flashing.

When you play around with ISTA, you will learn that this program requires the battery to be on a trickle charger that keeps the battery at 14.50 at all times.

lol. I have never hooked my car to a charger. Not even for the first long flash.

No ill affects. Flashes fine every time.

Not advice, just my experience.

type-dRew · 05-31-2020, 08:26 PM

Quote:

Originally Posted by Slim415

Quote:

Originally Posted by Smgs1992

If its dying off around 5500-6000rpm that is completely normal as that's where the stock turbos die off. It's much less noticeable until you tune the car. Simply shift sooner and it shouldn't be a problem.

Really? I thought that's where you get most of the power in that range. Why would the turbos die off that soon, and wouldn't the tune bring more power into that higher RPM range as an improvement? Seems kind of an odd engineering design.

This is an extremely well known fact. Just look at any stock turbo dyno.

I lose a half second or more in the 1/4 mile and lots of trap speed if I let it run to 7k every shift.

Shift at 5700-6000 and you'll be good. I have my trans tune setup to shift that early so it's not even a thought anymore.

Slim415 · 05-31-2020, 11:14 PM

Learn something new everyday

Saif2018 · 06-02-2020, 06:20 AM

Quote:

Originally Posted by Slim415

Really? I thought that's where you get most of the power in that range. Why would the turbos die off that soon, and wouldn't the tune bring more power into that higher RPM range as an improvement? Seems kind of an odd engineering design.

Stock turbos are designed to die off from about 5500rpm.

Your right about tune, a tune will typically keep the power/torque going longer into the rpm range, usually at least till 6-6.5k.

Upgraded turbos will hold boost up to about 7k.

stewbets · 06-02-2020, 01:43 PM

Quote:

Originally Posted by Saif2018

Stock turbos are designed to die off from about 5500rpm.

I wouldn't say that. I would say the stock turbos are designed to produce 8 pounds of boost instead of the 18+ these tunes call for. They simply cannot keep up with the volume needed for 18+ pounds at 5.5k+ RPM's.

Saif2018 · 06-02-2020, 04:42 PM

Quote:

Originally Posted by stewbets

I wouldn't say that. I would say the stock turbos are designed to produce 8 pounds of boost instead of the 18+ these tunes call for. They simply cannot keep up with the volume needed for 18+ pounds at 5.5k+ RPM's.

Your right, I was referring to the stock map, torque falls off a cliff from about 5k,

Targeting 18lb+ at 5.5k?

Which stage is that?

I thought I read stage 2 maps taper off 12-14lb?

https://mhdtuning.com/collections/mh...d-n54-map-pack

Or are you referring to Custom maps?

Smgs1992 · 06-02-2020, 04:47 PM

Mine holds 18-20psi at 5500rpm it does off a bit after. Stage 2+ I do have inlets though

Saif2018 · 06-03-2020, 05:40 AM

Quote:

Originally Posted by Smgs1992

Mine holds 18-20psi at 5500rpm it does off a bit after. Stage 2+ I do have inlets though

I assume you have a custom map, because stage 2+ ots doesn't target that high?

I wonder how long the turbos gonna last at that psi boost if you daily the car.

Smgs1992 · 06-03-2020, 08:03 AM

Quote:

Originally Posted by Saif2018

I assume you have a custom map, because stage 2+ ots doesn't target that high?

I wonder how long the turbos gonna last at that psi boost if you daily the car.

OTS map i have inlets though so it overboosts a bit.
They should last quite awhile theyre brand new with less than 5000miles on them. I plan on running a custom tune with E60 with around 24psi

Saif2018 · 06-03-2020, 09:38 AM

Quote:

Originally Posted by Smgs1992

OTS map i have inlets though so it overboosts a bit.
They should last quite awhile theyre brand new with less than 5000miles on them. I plan on running a custom tune with E60 with around 24psi

24 psi!!! Are they stock turbos?

Smgs1992 · 06-03-2020, 09:41 AM

Yessir. Im looking to make 470-480whp.

Saif2018 · 06-03-2020, 09:45 AM

Quote:

Originally Posted by Smgs1992

Yessir. Im looking to make 470-480whp.

That's crazy man, I hope it goes well for you.

You plan on dailying 24psi?

Smgs1992 · 06-03-2020, 09:54 AM

Thanks man it should be pretty doable with my setup.
Possibly but this car isnt my daily anyway. Its a weekend/fun car

Saif2018 · 06-04-2020, 07:23 AM

Quote:

Originally Posted by Smgs1992

Thanks man it should be pretty doable with my setup.
Possibly but this car isnt my daily anyway. Its a weekend/fun car

Ok, my N54 is my only daily at the moment, can't risk running 24psi

05-31-2020, 11:14 PM	#29
Slim415 Second Lieutenant 96 Rep 286 Posts Drives: 2011 335is 6MT Join Date: Jul 2019 Location: SF, CA iTrader: (0)	Learn something new everyday
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06-02-2020, 04:47 PM	#33
Smgs1992 Captain 726 Rep 946 Posts Drives: 2007 bmw 335i Join Date: Apr 2020 Location: Cincinnati ohio iTrader: (0)	Mine holds 18-20psi at 5500rpm it does off a bit after. Stage 2+ I do have inlets though __________________ 07 E92 335i 6MT, MMP inlets, DCI, VRSF 7.5 competition intercooler, VRSF catless downpipes, VRSF chargepipe, 335is clutch, Vader Solutions stage 2 LPFP, MHD stage 2+, Hawk HPS 5.0 pads, R1 Concepts drilled slotted rotors, TSW Nurburgring 19x8 19x9.5
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06-03-2020, 09:41 AM	#37
Smgs1992 Captain 726 Rep 946 Posts Drives: 2007 bmw 335i Join Date: Apr 2020 Location: Cincinnati ohio iTrader: (0)	Yessir. Im looking to make 470-480whp. __________________ 07 E92 335i 6MT, MMP inlets, DCI, VRSF 7.5 competition intercooler, VRSF catless downpipes, VRSF chargepipe, 335is clutch, Vader Solutions stage 2 LPFP, MHD stage 2+, Hawk HPS 5.0 pads, R1 Concepts drilled slotted rotors, TSW Nurburgring 19x8 19x9.5
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06-03-2020, 09:54 AM	#39
Smgs1992 Captain 726 Rep 946 Posts Drives: 2007 bmw 335i Join Date: Apr 2020 Location: Cincinnati ohio iTrader: (0)	Thanks man it should be pretty doable with my setup. Possibly but this car isnt my daily anyway. Its a weekend/fun car __________________ 07 E92 335i 6MT, MMP inlets, DCI, VRSF 7.5 competition intercooler, VRSF catless downpipes, VRSF chargepipe, 335is clutch, Vader Solutions stage 2 LPFP, MHD stage 2+, Hawk HPS 5.0 pads, R1 Concepts drilled slotted rotors, TSW Nurburgring 19x8 19x9.5
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