BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      07-13-2020, 07:52 AM   #1
F2UME
Registered
F2UME's Avatar
0
Rep
4
Posts

Drives: BMW 135i
Join Date: Jul 2020
Location: London, UK

iTrader: (0)

135i N55 - Not hitting requested PSI?

Firstly, Hello everyone! I have been looking for a 2013 White 135i N55 Manual for a while. I managed to pick one up in a spec I wanted a couple of months ago and it's lovely!

Anyway, to my concerns..


I have recently decided to go down the MHD tuning route. I purchased and fitted a VRSF decat down-pipe along with a Masata charge pipe.

Stock map + decat + chargepipe after inputting the datalogs into Virtual Dyno (Which i've been told is fairly accurate) was making 289WHP

STOCK (Decat + Chargepipe) DATALOGS --> https://datazap.me/u/f2ume/stock-dec...=0&data=4-5-20



--

I then went on to flash stage 1, power was noticeably better than stock but I still felt like it's not what I was hoping for.

I did some data logging and found it's not exactly hitting the target boost and i'm unsure what to make of it.

STAGE 1 DATALOGS(3) --> https://datazap.me/u/f2ume/stage-1-d...=2&data=4-5-20
After inputting these datalogs into Virtual dyno.. I was reaching an average of 320WHP



--

I was then told I should compare to how the boost would react to Stage 2+ (I'm aware I should have an upgraded FMIC but for these tests the IAT seem healthy so I gave it a go).

I did 3 more datalogs at stage2+ and the boost is still not meeting the target (IAT still looks fine..)

STAGE 2+ DATALOGS(3) -->https://datazap.me/u/f2ume/stage-2-d...=0&data=4-5-20

After putting these datalogs into Virtual Dyno I was getting an average of 288WHP??? This is less than Stage 1 and basically the same as STOCK, and what is going on with that Torque?



--


Does anyone have any suggestions or further analysis as to why this is happening?
Appreciate 0
      07-13-2020, 06:04 PM   #2
iminhell1
C2H5OH
iminhell1's Avatar
United_States
1700
Rep
1,809
Posts

Drives: 2010 SG 135i auto
Join Date: May 2015
Location: Darwin, MN

iTrader: (1)

stg 2,
Looks like around 5,400 is where boost starts to taper. Some of this is because "load req %" is tapering after this point. That is how all the maps below the E85 ones work, boost taper. But you're not coming anywhere near the req load so I'm not sure why it's following the trend, I'm not a N55 guy though, maybe there's some other thing to log that is more accurate, some subtractor?

Also I'm wondering if the coolant temp is playing a little into why it's not hitting targets. 230*F is on the warm side IMO. But I don't know when it starts pulling power.

Something looks to be screwed up with the MAF on this tune.
IAT is lower, boost is higher, yet "maf g/s" is lower, flattens around that 5,400 area. Something with the way it's being calculated is wrong, IMO.



stg 1,
Coolant is 10*F cooler here. Not sure how that plays in. Could be something.
This tune is running about 3* more ignition timing in the early/mid area. That's going to be more seat of the pants feel being these cars have very strong mid RPM punch. I don't doubt this tune makes more TQ in that range than stage 2 does. Odd as that is.
Also there's a couple timing pulls in this log. So I wouldn't put too much into this one. A clean log would be best to really nitpick.

4th is the best gear to log in. Most of the TQ nannies for the trans are turned off then and you'll have a better chance of getting a clean log. Just keep in mind the speeds and make sure you're being safe. You can start well before you need and stop well after. Then just cut out what you need with excel.



And I wonder if there's a slight boost leak above that 10'ish psi mark? Put zipties on all the vacuum lines to try and make sure they aren't a problem.
__________________
FBO (RB EVO inlets, Phoenix Racing 7.5" race, CP-e relocate / Tial, 1320 DP's, Berk mids, Custom E tune, XHP Stg III)
11.480 @ 121, 3,600#
2020: Speedtech, PTE 6766, 7.5"race, VTT DBBL, 2x450's, PR coils, Berk mids, E85
Appreciate 0
      07-14-2020, 12:09 PM   #3
F2UME
Registered
F2UME's Avatar
0
Rep
4
Posts

Drives: BMW 135i
Join Date: Jul 2020
Location: London, UK

iTrader: (0)

Quote:
Originally Posted by iminhell1 View Post
stg 2,
Looks like around 5,400 is where boost starts to taper. Some of this is because "load req %" is tapering after this point. That is how all the maps below the E85 ones work, boost taper. But you're not coming anywhere near the req load so I'm not sure why it's following the trend, I'm not a N55 guy though, maybe there's some other thing to log that is more accurate, some subtractor?

Also I'm wondering if the coolant temp is playing a little into why it's not hitting targets. 230*F is on the warm side IMO. But I don't know when it starts pulling power.

Something looks to be screwed up with the MAF on this tune.
IAT is lower, boost is higher, yet "maf g/s" is lower, flattens around that 5,400 area. Something with the way it's being calculated is wrong, IMO.



stg 1,
Coolant is 10*F cooler here. Not sure how that plays in. Could be something.
This tune is running about 3* more ignition timing in the early/mid area. That's going to be more seat of the pants feel being these cars have very strong mid RPM punch. I don't doubt this tune makes more TQ in that range than stage 2 does. Odd as that is.
Also there's a couple timing pulls in this log. So I wouldn't put too much into this one. A clean log would be best to really nitpick.

4th is the best gear to log in. Most of the TQ nannies for the trans are turned off then and you'll have a better chance of getting a clean log. Just keep in mind the speeds and make sure you're being safe. You can start well before you need and stop well after. Then just cut out what you need with excel.



And I wonder if there's a slight boost leak above that 10'ish psi mark? Put zipties on all the vacuum lines to try and make sure they aren't a problem.
Thanks for the response, I really appreciate your analysis, I will be trying a new Boost solenoid tomorrow / Thursday and will secure the vacuum lines for further testing..

In the mean time I have reached out to MHD and i'm hoping for some further responses here
Appreciate 0
      07-29-2020, 01:37 PM   #4
F2UME
Registered
F2UME's Avatar
0
Rep
4
Posts

Drives: BMW 135i
Join Date: Jul 2020
Location: London, UK

iTrader: (0)

I have replaced the boost control solenoid (Pierburg 700887220). This made no difference.
Appreciate 0
      07-29-2020, 01:38 PM   #5
F2UME
Registered
F2UME's Avatar
0
Rep
4
Posts

Drives: BMW 135i
Join Date: Jul 2020
Location: London, UK

iTrader: (0)

MHD got back to be and gave me a test Stage2+ file. I flashed the car and also replaced the throttle body to charge pipe o-ring.

I have only had a chance to do drive it once and the datalogs are looking much more promising throughout the rev range!
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 09:11 AM.




1addicts
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