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      05-10-2023, 11:58 AM   #39
n55david
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Drives: 2017 m240i, 2015 X3 x35i
Join Date: Aug 2018
Location: Michigan USA

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2017 m240i xDrive  [0.00]
2015 X3 x35i  [0.00]
2015 335i xdrive  [0.00]
Quote:
Originally Posted by Serb View Post
the car just hit 70k miles, bought it at around 64k and the only code that i’ve had come on was for the gas cap being too loose. i would assume it’s from being on a OTS tune instead of custom and accommodating for specific mods. my fault i know but im just looking for advice on how to rebuild now. what’s the best upgrades tueno setup? was looking into the new cast pure 800 maybe
The ots tunes as long as you're running what fuel the tune is for is 100% fine and your mods have nothing to do with anything. These cars have a wideband 02 sensor and it allows to computer to adjust for a preset air fuel ratio. Even the stock tune adjusts for the intake and downpipes etc. The idea that because you didn't have a custom tune done is by and large completely false..

Now when you get into large turbos you have issues with boost control sometimes and different throttle positions etc and will likely need a tune. Now for a stage 1 type it will run fine on a ots map etc.

You just had bad luck man.. it sucks. May as well grab a used oem from someone who's upgraded already or upgrade yourself. Good luck.
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2017 m240i xDrive 10.67@132.32mph w/bm3
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
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