Boost is under target, Advice Needed

[AmexXpress]

Hey guys my first post on the forums. I just finished putting together my 135i after working on it because of the clutch going out, took that time to do a bunch of maintenance and put in a csf radiator. But ever since I put it all back together my boost has been not reaching its target.

I'm currently Running on 91 oct Stage 2+ but I'm only making 6.9psi when target is 16-18psi
I've been looking around and I saw how it might be the boost solenoids or vacuum lines. I have new vacuum lines to put on and I can order new solenoids no problem, cant really test them because it requires reving and my friend is currently using my exhaust to pass smog while I use his straight pipe.

My current Mods are:
VRSF DCI
VRSF Relocated Inlets
VRSF Upgraded Outlets
5" Intercooler BMS
BMS Chargepipe w/ Tial BOV
CSF Radiator

Any advice would help , here is also a data log as I see people asking for them alot.
Data Log
https://datazap.me/u/amexxpress/910?log=0&data=3-4-18

[ErvGotti]

Are you going WOT? your accel ped position is only at 66%. Usually if it's a boost leak your WGDC after pid will skyrocket, but yours around 33%. So it is either the boost solenoids or a vacuum line, your on the right track. Realistically if those are the original vacuum lines and solenoids they probably need to be replaced anyways.

[AmexXpress]

Originally Posted by ErvGotti

Are you going WOT? your accel ped position is only at 66%. Usually if it's a boost leak your WGDC after pid will skyrocket, but yours around 33%. So it is either the boost solenoids or a vacuum line, your on the right track. Realistically if those are the original vacuum lines and solenoids they probably need to be replaced anyways.

I've replaced the vacuum lines before once, i think the boost solenoids are original though, I put in an order for those. I have new vacuum lines too that are more heat resistant.

[AmexXpress]

should I reset all my adaptations? i had my foot all the way down on the pedal

[ErvGotti]

Yeah I'm not sure what is going on there, my logs show 99.6 accel ped position on WOT. Try resetting adaptations, but for throttle reset there's a specific way to do it in MHD. MHD spells it out.

[AmexXpress]

understood

[AmexXpress]

Originally Posted by ErvGotti

Yeah I'm not sure what is going on there, my logs show 99.6 accel ped position on WOT. Try resetting adaptations, but for throttle reset there's a specific way to do it in MHD. MHD spells it out.

So today i did another log
from 3rd gear 3000 rpm to 6000 rpm
I reset all adaptations aswell

https://datazap.me/u/amexxpress/911-...og=0&data=3-18

[AmexXpress]

https://datazap.me/u/amexxpress/912?...-4-18-26-27-28
New Data Log, Made sure to go WOT. Is this what happens when a boost solenoid is going out?

[ErvGotti]

Originally Posted by AmexXpress

https://datazap.me/u/amexxpress/912?...-4-18-26-27-28
New Data Log, Made sure to go WOT. Is this what happens when a boost solenoid is going out?

Could be that or a boost leak, surprised your car hasn't thrown an underboost code. But with boost leaks your WGDC value would be high. I would also look at your map sensor, make sure it clean and what not.

[AmexXpress]

Originally Posted by ErvGotti

Could be that or a boost leak, surprised your car hasn't thrown an underboost code. But with boost leaks your WGDC value would be high. I would also look at your map sensor, make sure it clean and what not.

I had just replaced both map sensors and put a tmap 3.5

[ErvGotti]

Originally Posted by AmexXpress

I had just replaced both map sensors and put a tmap 3.5

Are you running a custom tune? Do you have the box ticked in MHD for the 3.5 bar sensor? You can't just throw the sensor on it will not work properly. The scales on the MHD maps have to be properly adjusted to account for the new sensor.

[AmexXpress]

Originally Posted by ErvGotti

Are you running a custom tune? Do you have the box ticked in MHD for the 3.5 bar sensor? You can't just throw the sensor on it will not work properly. The scales on the MHD maps have to be properly adjusted to account for the new sensor.

Just running the ots v9 stage 2+ , 3.5 Bar is checked

[ErvGotti]

Originally Posted by AmexXpress

Just running the ots v9 stage 2+ , 3.5 Bar is checked

You still need to run a custom map, the load tables in MHD are tuned different for the sensors. I recommend putting the stock sensor back on until you get a custom tune.

Realistically you do not need the 3.5 bar sensor until you upgrade your turbo's and plan to boost above 20 PSI. The stock sensor is good up to 20-22 PSI. It is not recommended to run your stock turbos above 20 PSI as they will be out of they're efficiency range. So the only reason to run the 3.5 bar sensor is when running upgraded turbo's.

[AmexXpress]

Originally Posted by ErvGotti

You still need to run a custom map, the load tables in MHD are tuned different for the sensors. I recommend putting the stock sensor back on until you get a custom tune.

Realistically you do not need the 3.5 bar sensor until you upgrade your turbo's and plan to boost above 20 PSI. The stock sensor is good up to 20-22 PSI. It is not recommended to run your stock turbos above 20 PSI as they will be out of they're efficiency range. So the only reason to run the 3.5 bar sensor is when running upgraded turbo's.

Oh ok, I replaced the tmap sensor as the other one stopped functioning properly giving me lean codes. I dont think its the tmap 3.5 as my boost was working properly with it on before. I also have another friend running perfectly fine with a tmap 3.5 bar on his 135i stock turbos. Would a bad connection on the intercooler or something cause the boost to still be there but not up to what it can be. I.E 6psi to target 18.2?

[G3min1]

This calls for a Smoke test.

[ErvGotti]

Originally Posted by AmexXpress

Oh ok, I replaced the tmap sensor as the other one stopped functioning properly giving me lean codes. I dont think its the tmap 3.5 as my boost was working properly with it on before. I also have another friend running perfectly fine with a tmap 3.5 bar on his 135i stock turbos. Would a bad connection on the intercooler or something cause the boost to still be there but not up to what it can be. I.E 6psi to target 18.2?

Yes a boost leak can cause the symptoms. I've dealt with them before and they're a pain in the ass to find at times. But usually they are accompanied by under boost code and the WGDC shooting up as the turbo's try to hit target PSI.

[AmexXpress]

Originally Posted by G3min1

This calls for a Smoke test.

I need to make a smoke tester, ducks smoke testers are like 10p bucks

[AmexXpress]

Originally Posted by ErvGotti

Yes a boost leak can cause the symptoms. I've dealt with them before and they're a pain in the ass to find at times. But usually they are accompanied by under boost code and the WGDC shooting up as the turbo's try to hit target PSI.

Oh so I have a 30ff shadow code. But none active

[AmexXpress]

Originally Posted by ErvGotti

Yes a boost leak can cause the symptoms. I've dealt with them before and they're a pain in the ass to find at times. But usually they are accompanied by under boost code and the WGDC shooting up as the turbo's try to hit target PSI.

Ok so I put new boost solenoids in but that did not work. Preventative maintenance I guess lol. For me WGDC doesn't shoot up as you say. I have the shadow 30ff code still As well. I think it might be from the piping. Hearing air rush when I accelerate. but im still at a steady 7psi when target is 18.2.

Im hoping its just the piping. I had to make the Vrsf Upgraded outlets fit with the csf radiator so it might be that connection. It was a hard to fit and tighten area.

[xrockoutx]

Did you use the harness for the 3.5 tmap or repin your connector? Would be throwing a code if you didn't though.

[AmexXpress]

Originally Posted by xrockoutx

Did you use the harness for the 3.5 tmap or repin your connector? Would be throwing a code if you didn't though.

I got the 3.5 tmap harness

[iminhell1]

How to kill turbos 101,
keep overspinning them while never physically checking for leaks.