[Verse]

I’ve had my 2018 M240i Coupe w/ the 6MT for about a week. A few days ago, I went Stage 1 with BM3 & I was blown away. Every time I hit the gas I felt like I was in a rocket. The day after, I was beating on it moderately hard. Lots of pulls, never really foot to the floor or anything but just putting torque down and having fun doing it.

Fast forward to yesterday, and it started to not pull nearly as hard. It feels like boost isn’t building as quickly, and almost falls on its face in higher RPM. The other day in 6th gear on the highway you could tap the gas and get thrown back in your seat still at highway speed.. doesn’t really feel that way anymore.

Does this sound like it could be a boost leak or something like that? This is my first car with a turbo so cut me slack.

I did some data logging with BM3 but not sure what to look for on the graph. I tried to figure it out a bit, all I saw was my boost target didn’t go over like 17.8 or something at one point. I figured tuned it would’ve been a little higher, no?

If anybody could check it and see if I have anything to worry about, I would be beyond appreciative.

https://www.bootmod3.net/log?id=64fc...90c6baea7386f6

[cooolone2]

Different gas?

[Jcoop901]

Sounds like an octane issue. Pulling timing.

[n55david]

Originally Posted by Verse

I’ve had my 2018 M240i Coupe w/ the 6MT for about a week. A few days ago, I went Stage 1 with BM3 & I was blown away. Every time I hit the gas I felt like I was in a rocket. The day after, I was beating on it moderately hard. Lots of pulls, never really foot to the floor or anything but just putting torque down and having fun doing it.

Fast forward to yesterday, and it started to not pull nearly as hard. It feels like boost isn’t building as quickly, and almost falls on its face in higher RPM. The other day in 6th gear on the highway you could tap the gas and get thrown back in your seat still at highway speed.. doesn’t really feel that way anymore.

Does this sound like it could be a boost leak or something like that? This is my first car with a turbo so cut me slack.

I did some data logging with BM3 but not sure what to look for on the graph. I tried to figure it out a bit, all I saw was my boost target didn’t go over like 17.8 or something at one point. I figured tuned it would’ve been a little higher, no?

If anybody could check it and see if I have anything to worry about, I would be beyond appreciative.

https://www.bootmod3.net/log?id=64fc...90c6baea7386f6

Your log is useless.

You need to do a log from 2500rpm to at least 6500rpm. Wot. Traction control completely off and you wanna do it in 3rd or 4th gear.

Do that and repost.

[n55david]

Originally Posted by Jcoop901

Sounds like an octane issue. Pulling timing.

It doesn't sound like anything without more data..

[void58]

Sounds silly but are you on less than a 1/4 tank?

[n55david]

Originally Posted by void58

Sounds silly but are you on less than a 1/4 tank?

I generally do most of my racing with under 1/4 tank.. fyi. Thats not a thing unless you have a lpfp pickup etc issue