jb4 timing pulls colder weather

[Lmaiuri]

Anyone experiencing timing pulls with jb4 in colder weather? This is my first winter with the 1er and last night on a hard pull with my friends 1m, I felt a distinctive timing pull (4th gear). I'm FBO on 93 octane. This also brings me to my next question. Pro tuned Cobb guys, do you experience the same timing pulls? Is the DME not allowing for full tuning capability to be maximized in colder weather?


/buys evo8

[135Pats]

Originally Posted by Lmaiuri

Anyone experiencing timing pulls with jb4 in colder weather? This is my first winter with the 1er and last night on a hard pull with my friends 1m, I felt a distinctive timing pull (4th gear). I'm FBO on 93 octane. This also brings me to my next question. Pro tuned Cobb guys, do you experience the same timing pulls? Is the DME not allowing for full tuning capability to be maximized in colder weather?


/buys evo8

What you are saying doesn’t make much sense. Cooler ambient temps = denser charge air + cooler charge temps = cooler and more efficient combustion and less duty cycle to move equivalent air flow. Cold weather is a godsend for forced induction, traction issues aside.
You may be pulling timing but it’s sure as hell not due to the colder weather. The tune is irrelevant in this context. Do you have any data logs?

[b1aze]

Hard to be sure it's a timing pull and not throttle closure due to over boost. Without a datalog it's hard to say exactly what happened.