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      07-13-2020, 07:52 AM   #1
ef2
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Drives: BMW 135i
Join Date: Jul 2020
Location: London, UK

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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



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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



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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?



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Does anyone have any suggestions or further analysis as to why this is happening?
Appreciate 0