F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > What gauges do you run in your bootmod3 dashboard?
European Auto Source (EAS)
Post Reply
 
Thread Tools Search this Thread
      04-25-2018, 12:09 PM   #1
deezeedee335
Private
deezeedee335's Avatar
28
Rep
82
Posts

Drives: 2013 F30 335i PWG
Join Date: Sep 2016
Location: Nor Cal

iTrader: (1)

What gauges do you run in your bootmod3 dashboard?

Just wanted to get a feel for what gauges people are using in there bootmod3 dashboard.

I also have a question on a few of the gauges.

- What are the difference between the three boost gauges. Boost (Pre-Throttle), Boost Pressure (Deviation) and Boost Pressure (Target)?

-What is the difference between the three different AIT gauges?

-What is the difference between the three MAF gauges?

There seems to be some duplicates items you can select and I am unsure which one is the correct one to look at or if it even matters.

Thanks
Appreciate 0
      04-25-2018, 12:42 PM   #2
JaredG_F30
Major
JaredG_F30's Avatar
925
Rep
1,442
Posts

Drives: 2014 335i, M-Sport, Manual
Join Date: Dec 2016
Location: Raleigh, NC

iTrader: (0)

Boost pre-throttle is the boost pressure measured in the charged air system just prior top the throttle plate.

Boost target (or commanded) is the boost pressure the DME wants

Boost deviation is boost target - boost (pre-throttle)

I'm assuming you meant IAT, not AIT! There must be two sensor locations for measuring intake air temps. I'm assuming the default IAT PID chosen is located in the intake air manifold. I'm not sure about the other one.

MAF, of mass air flow, measures the amount of air being sucked through the intake. I'm not sure why there are 3.

I run IAT, ignition Cyl 1, boost (pre-throttle), coolant temp, EGT, knock detected, oil pressure
__________________

2014 F30 335i, M-Sport, 6MT, V804s, custom exhaust, CTS Turbo Intake & IC, FTP CP, VRSF DP, TMS Strut Brace, BM3 Stg 2, AEM WMI, H&R Sport Springs (381 whp, 429 wtq on Cali 91oct before WMI).
SPI Films Blog/DIY Vids

Last edited by JaredG_F30; 04-25-2018 at 12:47 PM..
Appreciate 3
      04-25-2018, 02:01 PM   #3
deezeedee335
Private
deezeedee335's Avatar
28
Rep
82
Posts

Drives: 2013 F30 335i PWG
Join Date: Sep 2016
Location: Nor Cal

iTrader: (1)

Quote:
Originally Posted by JaredG_F30 View Post
Boost pre-throttle is the boost pressure measured in the charged air system just prior top the throttle plate.

Boost target (or commanded) is the boost pressure the DME wants

Boost deviation is boost target - boost (pre-throttle)

I'm assuming you meant IAT, not AIT! There must be two sensor locations for measuring intake air temps. I'm assuming the default IAT PID chosen is located in the intake air manifold. I'm not sure about the other one.

MAF, of mass air flow, measures the amount of air being sucked through the intake. I'm not sure why there are 3.

I run IAT, ignition Cyl 1, boost (pre-throttle), coolant temp, EGT, knock detected, oil pressure
Quote:
Originally Posted by JaredG_F30 View Post
Boost pre-throttle is the boost pressure measured in the charged air system just prior top the throttle plate.

Boost target (or commanded) is the boost pressure the DME wants

Boost deviation is boost target - boost (pre-throttle)

I'm assuming you meant IAT, not AIT! There must be two sensor locations for measuring intake air temps. I'm assuming the default IAT PID chosen is located in the intake air manifold. I'm not sure about the other one.

MAF, of mass air flow, measures the amount of air being sucked through the intake. I'm not sure why there are 3.

I run IAT, ignition Cyl 1, boost (pre-throttle), coolant temp, EGT, knock detected, oil pressure
Thanks for the explanation!!! And yes it was a typo, I meant to say IAT!!

Also can you explain EGT?
__________________
2013 F30 335i PWG
VRSF DP/ VRSF FMIC/ ER CP/ AFE Intake Filter/ PowerStop Brakes/ Custom Exhaust/ BM3 Stg 2/ AEM Water Methanol Injection/ MotorSports Hardware Studs, Locks and Spacers
Appreciate 1
badbread297.00

      04-25-2018, 02:27 PM   #4
BMWcurious
Private First Class
United Kingdom
224
Rep
188
Posts

Drives: Various BMWs
Join Date: Apr 2013
Location: St Andrews

iTrader: (0)

EGT in the case of the N55 is a modeled value used in an exhaust gas expansion model to calculate the exhaust fractions required through the turbine and the wastegate (hence calculating the required wastegate position). It is also used in fuel calculations.
Appreciate 3
      04-25-2018, 05:55 PM   #5
alex_j_5
14 335i M Sport EB II | VRSF 5" HD FMIC / CP, AWE
25
Rep
97
Posts

Drives: 335i m sport
Join Date: Feb 2018
Location: Brisbane

iTrader: (0)

Just wondering what is a good range of IAT to know your fmic is doing a good job ?
__________________
14 335i M Sport EB II | VRSF 5" HD FMIC / CP/ DP, AWE AXLEBACK, BM3 Stage 2
Appreciate 1
      04-25-2018, 06:34 PM   #6
deezeedee335
Private
deezeedee335's Avatar
28
Rep
82
Posts

Drives: 2013 F30 335i PWG
Join Date: Sep 2016
Location: Nor Cal

iTrader: (1)

Quote:
Originally Posted by alex_j_5 View Post
Just wondering what is a good range of IAT to know your fmic is doing a good job ?
That is a good question!!! I have the same FMIC as you and I am usually about 10 degrees higher that outside temp.

Don't really know if that is good or not??
Appreciate 0
      04-25-2018, 08:35 PM   #7
JaredG_F30
Major
JaredG_F30's Avatar
925
Rep
1,442
Posts

Drives: 2014 335i, M-Sport, Manual
Join Date: Dec 2016
Location: Raleigh, NC

iTrader: (0)

Exhaust Gas Temp

Quote:
Originally Posted by deezeedee335 View Post
Thanks for the explanation!!! And yes it was a typo, I meant to say IAT!!

Also can you explain EGT?
Appreciate 1
      04-25-2018, 08:36 PM   #8
JaredG_F30
Major
JaredG_F30's Avatar
925
Rep
1,442
Posts

Drives: 2014 335i, M-Sport, Manual
Join Date: Dec 2016
Location: Raleigh, NC

iTrader: (0)

Quote:
Originally Posted by BMWcurious View Post
EGT in the case of the N55 is a modeled value used in an exhaust gas expansion model to calculate the exhaust fractions required through the turbine and the wastegate (hence calculating the required wastegate position). It is also used in fuel calculations.
Also this^
Appreciate 1
      04-27-2018, 10:28 PM   #9
FSociety
2020 X3M/X4M Coming Soon
FSociety's Avatar
No_Country
3209
Rep
7,082
Posts

Drives: F90 M5, F80 M3 ZCP
Join Date: Apr 2012
Location: NYC NJ CT PA FL

iTrader: (3)

Garage List
Dashboard itself I keep it simple, defaults +/- some adjustments
Oil Temp +
__________________
F90 M5 @BM3Tuning/HCP Stg1 6.6s | 10.3@134 | 0-60 2.61s | HCP Stg2 60-130 6.1s 10.1@138
F98 X4MC

http://www.instagram.com/BMWF9XM
Appreciate 1
      05-02-2018, 08:55 PM   #10
amw896
Major
amw896's Avatar
Canada
545
Rep
1,093
Posts

Drives: 2015 BMW M235i
Join Date: Feb 2016
Location: ontario

iTrader: (0)

Garage List
2015 BMW M235i  [5.00]
can someone please enlighten me on how to properly monitor oil pressure? I've added it to my gauges seeing as how the more I read about modding turbo cars, the more people talk about how critical oil pressure is. What is a good level? I'm looking at the read out and realizing I have no clue if I'm good or not lol.
Appreciate 1
      12-02-2019, 08:12 PM   #11
enlimalima
New Member
2
Rep
29
Posts

Drives: 335i F30 PWG
Join Date: Oct 2019
Location: Indonesia

iTrader: (0)

Quote:
Originally Posted by JaredG_F30 View Post
Boost pre-throttle is the boost pressure measured in the charged air system just prior top the throttle plate.

Boost target (or commanded) is the boost pressure the DME wants

Boost deviation is boost target - boost (pre-throttle)

I'm assuming you meant IAT, not AIT! There must be two sensor locations for measuring intake air temps. I'm assuming the default IAT PID chosen is located in the intake air manifold. I'm not sure about the other one.

MAF, of mass air flow, measures the amount of air being sucked through the intake. I'm not sure why there are 3.

I run IAT, ignition Cyl 1, boost (pre-throttle), coolant temp, EGT, knock detected, oil pressure
So what is the actual boost? And when you upgrade turbo and "increase" your boost (say to 20/21psi) do you increase the pre-throttle or DME target?

How do you know if the boost is working well?
Appreciate 0
      12-02-2019, 09:08 PM   #12
johnung
Major
United_States
874
Rep
1,400
Posts

Drives: 2015 BMW 335i x-Drive Auto
Join Date: Oct 2017
Location: New Jersey

iTrader: (0)

Garage List
Quote:
Originally Posted by enlimalima View Post
Quote:
Originally Posted by JaredG_F30 View Post
Boost pre-throttle is the boost pressure measured in the charged air system just prior top the throttle plate.

Boost target (or commanded) is the boost pressure the DME wants

Boost deviation is boost target - boost (pre-throttle)

I'm assuming you meant IAT, not AIT! There must be two sensor locations for measuring intake air temps. I'm assuming the default IAT PID chosen is located in the intake air manifold. I'm not sure about the other one.

MAF, of mass air flow, measures the amount of air being sucked through the intake. I'm not sure why there are 3.

I run IAT, ignition Cyl 1, boost (pre-throttle), coolant temp, EGT, knock detected, oil pressure
So what is the actual boost? And when you upgrade turbo and "increase" your boost (say to 20/21psi) do you increase the pre-throttle or DME target?

How do you know if the boost is working well?
A quick way to add a real-time boost or other gauges is to purchase and plug in one of these Bluetooth connectors into your OBD2 port near the driver's left knee. Please see attached photos. It has phone apps to add gauges and performance testing like 0-60mph and 1/4 mile. Inexpensive and works well!
Attached Images
  
Appreciate 0
      12-02-2019, 11:27 PM   #13
thejeremyman9
First Lieutenant
125
Rep
397
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: USA

iTrader: (0)

Quote:
Originally Posted by enlimalima View Post
So what is the actual boost? And when you upgrade turbo and "increase" your boost (say to 20/21psi) do you increase the pre-throttle or DME target?

How do you know if the boost is working well?
What are you using for datalogging/monitoring?

In MHD, you can see boost target, boost pre throttle, and boost manifold. You want to compare boost in the manifold vs. boost target. +/- 1 psi deviation is considered normal. More than that you might have a leak or other issue.

The manifold boost is the "actual" boost the engine is seeing. Boost pre throttle will be the same when the throttle is open 100%, but just because you have the pedal at 100% that does not mean the throttle is fully open. Some tunes regulate throttle position to control boost, engine load, etc.

You will not target higher boost simply by bolting on a bigger turbo. You need a tune that targets higher boost. You take advantage of the bigger turbo by targeting a higher boost that is not possible with stock turbo (over simpifying because a bigger turbo will generally make more HP than a smaller turbo at the same boost level, but thats the general idea). If you increase pre-throttle or manifold boost without increasing DME target that would be overboosting... your tune should not do that.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:33 PM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST