[NateP3]

2014 335i xDrive (N55). Stage 2 93 Agg.

MST Intake
VRSF ChargePipe
Wagner Tuning Comp 2 FMIC
VRSF Catless Downpipe
AWE Full Exhaust w/ Performance Midpipe
NGK 97506 Plugs gapped at .022

How does this log look?

https://www.bootmod3.net/log?id=5f7f...0b437a26c2efe7

[NateP3]

Bump

[n55david]

looks fantastic cept where you go from 11 degrees of timing to like 9 then to like literally 0 then it comes back. super weird

I'm on my phone and can't see detail so great but I don't see knock, no fuel pressure dips. honestly other than that it looks practically perfect.

you mixed some e85 in didn't you? you're afr says you may have . and what fuel pump are you running?

[harkes]

Why have you gapped the plugs?

[MTWO]

Log looks perfect to me. How do you like the MST intake?

[thejeremyman9]

Overall yes this log is really clean. Timing is great and indicates excellent fuel quality. I would say that boost does seem to drop quite a bit in the upper RPM... although most people dont rev all the way to 7k. Some drop in upper RPM is normal as the turbo can't keep up but i would take a look at a few other logs on the same map and see if people are holding more than ~13 psi to redline. WGDC is reasonably low though so that's good.

SFTFs are also quite positive, over 15% fuel added through most of the pull. So did you add ethanol to this tank or not?

[NateP3]

Originally Posted by thejeremyman9

Overall yes this log is really clean. Timing is great and indicates excellent fuel quality. I would say that boost does seem to drop quite a bit in the upper RPM... although most people dont rev all the way to 7k. Some drop in upper RPM is normal as the turbo can't keep up but i would take a look at a few other logs on the same map and see if people are holding more than ~13 psi to redline. WGDC is reasonably low though so that's good.

SFTFs are also quite positive, over 15% fuel added through most of the pull. So did you add ethanol to this tank or not?

I have not added any ethanol, this is 93 from my local gas station. Is there anything I should be worried about?

[NateP3]

Originally Posted by Phantom10R

looks fantastic cept where you go from 11 degrees of timing to like 9 then to like literally 0 then it comes back. super weird

I'm on my phone and can't see detail so great but I don't see knock, no fuel pressure dips. honestly other than that it looks practically perfect.

you mixed some e85 in didn't you? you're afr says you may have . and what fuel pump are you running?

I didnt add any e85, this is 93 from my local gas station.

[NateP3]

Originally Posted by harkes

Why have you gapped the plugs?

ProTuningFreaks advises to do so

[NateP3]

Originally Posted by MTWO

Log looks perfect to me. How do you like the MST intake?

Sound from it is amazing.

[thejeremyman9]

Originally Posted by NateP3

I have not added any ethanol, this is 93 from my local gas station. Is there anything I should be worried about?

There's nothing inherently bad about STFT corrections, but +15% fuel is quite a bit of correction if you are just running pump gas. It basically means the tune is a little lean for whatever reason (or at least the DME thinks so based on O2 sensor readings) so it has to add that much fuel to reach AFR (lambda targets). I would just log again on the next tank of gas to see if maybe its a fluke. It could also be your intake, but you are maxing out MAF readings so its hard to say. Typical fuel STFTs are <5% with BM3 OTS maps running pump gas.

[NateP3]

Originally Posted by thejeremyman9

There's nothing inherently bad about STFT corrections, but +15% fuel is quite a bit of correction if you are just running pump gas. It basically means the tune is a little lean for whatever reason (or at least the DME thinks so based on O2 sensor readings) so it has to add that much fuel to reach AFR (lambda targets). I would just log again on the next tank of gas to see if maybe its a fluke. It could also be your intake, but you are maxing out MAF readings so its hard to say. Typical fuel STFTs are <5% with BM3 OTS maps running pump gas.

Someone else said I may have a loose downpipe, you think can cause it?

[thejeremyman9]

Originally Posted by NateP3

Someone else said I may have a loose downpipe, you think can cause it?

If your DP is loose on the turbo side, yes, because you could have an exhaust leak before the O2 sensor and that could be throwing off AFRs. If its loose on the catback side (bottom), there's pretty much no way since that's pretty far downstream of the primary O2 sensor.

[NateP3]

Originally Posted by thejeremyman9

If your DP is loose on the turbo side, yes, because you could have an exhaust leak before the O2 sensor and that could be throwing off AFRs. If its loose on the catback side (bottom), there's pretty much no way since that's pretty far downstream of the primary O2 sensor.

Thanks for the feedback. You think its also possible that can be the cause of lower boost in higher RPMs?

[thejeremyman9]

Originally Posted by NateP3

Thanks for the feedback. You think its also possible that can be the cause of lower boost in higher RPMs?

No not really. You would need an exhaust leak before the turbo to affect how much boost you are making. I mean, AFRs have a very small impact on turbo spool via EGTs but i think the short answer is no.

Your boost deviation in upper RPM just seemed a bit more than normal for EWG, although as i said some falloff is normal on stock turbo. I would check a few other BM3 logs running the same tune and see. You could also pressure test to confirm no leaks.

[MTWO]

I wouldn’t say +15% means its lean. Its just fuel trims. Lean means when actual AFR is leaner than target because fuel trim couldn’t self adjust

[thejeremyman9]

Originally Posted by MTWO

I wouldn’t say +15% means its lean. Its just fuel trims. Lean means when actual AFR is leaner than target because fuel trim couldn’t self adjust

Yes i know, that's exactly what i said in my post a couple above. The DME thinks its lean based on O2 sensor data, "so it has to add that much fuel to reach AFR (lambda targets)"

[MTWO]

Originally Posted by thejeremyman9

Yes i know, that's exactly what i said in my post a couple above. The DME thinks its lean based on O2 sensor data, "so it has to add that much fuel to reach AFR (lambda targets)"

Gotcha

[harkes]

Originally Posted by thejeremyman9

Overall yes this log is really clean. Timing is great and indicates excellent fuel quality. I would say that boost does seem to drop quite a bit in the upper RPM... although most people dont rev all the way to 7k. Some drop in upper RPM is normal as the turbo can't keep up but i would take a look at a few other logs on the same map and see if people are holding more than ~13 psi to redline. WGDC is reasonably low though so that's good.

SFTFs are also quite positive, over 15% fuel added through most of the pull. So did you add ethanol to this tank or not?

Could be because he did the log shortly after flashing. LTFT is not logged though.

[NateP3]

Originally Posted by thejeremyman9

If your DP is loose on the turbo side, yes, because you could have an exhaust leak before the O2 sensor and that could be throwing off AFRs. If its loose on the catback side (bottom), there's pretty much no way since that's pretty far downstream of the primary O2 sensor.

Quick question, im going to have the V Band tightened from the turbo to downpipe and log again. What parameters should I be looking at to tell if it is running lean or not? And where I can look to see the fuel correction?

[TK335iMSPT]

This log looks fantastic! Where in NY are based? Im in North Jersey right next to the city and myself and a few others are battling timing/knocking issues due to bad fuel. Wondering where you fuel up and if this is just 93 or if you added e85/booster.

[NateP3]

Originally Posted by TK335iMSPT

This log looks fantastic! Where in NY are based? Im in North Jersey right next to the city and myself and a few others are battling timing/knocking issues due to bad fuel. Wondering where you fuel up and if this is just 93 or if you added e85/booster.

Im in Upstate NY, like 2-3 hours from the city, also this is just 93. It may look like I have e85, possibly due to my downpipe possibly being loose