[kingbmw5050]

I am getting 380km to a tank in the city and average 15.9ltires for every 100km

I am on MHD stage 2 plus using 94 octane. Is this too high I am a 6 speed auto with the xhp.

Plugs coils changed ,walnut blasted last week no engine misfires or hiccups.

Is this normal for these cars?

Also I notice car is not as powerful when I hit low fuel or close to empty, but then when I fill up again car is full power could this be a bad fuel pump injectors ?

[Bimmer_Bro]

Originally Posted by kingbmw5050

I am getting 380km to a tank in the city and average 15.9ltires for every 100km

I am on MHD stage 2 plus using 94 octane. Is this too high I am a 6 speed auto with the xhp.

Plugs coils changed ,walnut blasted last week no engine misfires or hiccups.

Is this normal for these cars?

Also I notice car is not as powerful when I hit low fuel or close to empty, but then when I fill up again car is full power could this be a bad fuel pump injectors ?

Sounds a bit high. I am stage 2+ auto and xhp and I usually average low 12L per 100km

You will need to a log to check fuel pumps. Could also be a small boost leak that the turbos are working harder to compensate. Possibly old boost Solenoids?

Are you using the M1 throttle mapping option at all?

[kingbmw5050]

Just replaced boost solenoids with brand new ones two weeks ago.

No I have not used m1 mapping what does that do throttle sensitivity ?

[Bimmer_Bro]

Originally Posted by kingbmw5050

Just replaced boost solenoids with brand new ones two weeks ago.

No I have not used m1 mapping what does that do throttle sensitivity ?

Yes it feels great but I think it slightly effected my gas mileage negatively ( still worth it). I settled on 70%.

In your case you may want to do a third gear log to check boost, waste gate duty cycle and what your fuel pumps are doing.

[Saif2018]

Originally Posted by kingbmw5050

I am getting 380km to a tank in the city and average 15.9ltires for every 100km

I am on MHD stage 2 plus using 94 octane. Is this too high I am a 6 speed auto with the xhp.

Plugs coils changed ,walnut blasted last week no engine misfires or hiccups.

Is this normal for these cars?

Also I notice car is not as powerful when I hit low fuel or close to empty, but then when I fill up again car is full power could this be a bad fuel pump injectors ?

I'm at around 12-13 litres per 100km,

Should be somewhere around 12-14 litres per 100km if most of your driving is city driving, if you do a lot of highway driving should be significantly lower than 12l/100km

Although if your ripping it everywhere or stuck in stop go traffic most of the time, it can increase

It's worth physically checking your injectors for leaks, 3 of mine was leaking and I was getting around 16 litres per 100km combined city and highway driving, it was getting progressively worse regardless of how I drove.

Do a log and check HPFP and LPFP, trims etc

[studio54]

Originally Posted by Saif2018

I'm at around 12-13 litres per 100km,

Should be somewhere around 12-14 litres per 100km if most of your driving is city driving, if you do a lot of highway driving should be significantly lower than 12l/100km

Although if your ripping it everywhere or stuck in stop go traffic most of the time, it can increase

It's worth physically checking your injectors for leaks, 3 of mine was leaking and I was getting around 16 litres per 100km combined city and highway driving, it was getting progressively worse regardless of how I drove.

Do a log and check HPFP and LPFP, trims etc

Hey Saif, do you have by any chance some logs where you know your injectors were leaking ? (with lambda 1/2 , STFT, & LTFT)

[Saif2018]

Originally Posted by studio54

Hey Saif, do you have by any chance some logs where you know your injectors were leaking ? (with lambda 1/2 , STFT, & LTFT)

This was the last log with 3 x Injectors leaking in one bank, I don't think logs are good idea to judge if injectors are leaking over physically pulling plugs/injectors

I'd physically check or get plugs and injectors checked regardless, at least that way you can be sure if they are leaking or not.

https://datazap.me/u/shelim2020/v51?...=3-18-19-23-24

[studio54]

Originally Posted by Saif2018

This was the last log with 3 x Injectors leaking in one bank, I don't think logs are good idea to judge if injectors are leaking over physically pulling plugs/injectors

I'd physically check or get plugs and injectors checked regardless, at least that way you can be sure if they are leaking or not.

https://datazap.me/u/shelim2020/v51?...=3-18-19-23-24

Thanks, I agree that checking plugs is the final confirmation but...

I think you can judge if injectors are leaking if it's leaking enough, and I think logging specific values to a problem can be a good indicator prior doing any stuff.

I posted an idea in the "cleaning injector" thread, that maybe logging rail pressure over night might indicating injector leaks if a major drop in pressure is seen. Cause chances are either the pressure is lost via fuel regulator (will cause long crank), either it's lost via an injector leak (might cause long crank but depend how it leaks).

However in your case, it's not that obvious, we just can see bank 1 afr is a bit late compared to bank 2 afr, but that is seen on lot of other cars, and when it got back to 234 it's staying there.

When there are rich spike on let off like the o2 going back to 234 but not staying flat and having some multiple dips under 234 might indicating an injector is leaking in the according bank. If one bank is a bit late compared to the other to go to 234, it probably might be because O2 are simply a lazy/tired.

You said you had 3 injectors leaking in the same bank? may I ask which bank ? cause your stft 1/2 & ltft 1/2 seems to mirror by small margin, I would imagine a bigger delta between banks if 3 injectors were leaking in one bank.

[Saif2018]

Originally Posted by studio54

Thanks, I agree that checking plugs is the final confirmation but...

I think you can judge if injectors are leaking if it's leaking enough, and I think logging specific values to a problem can be a good indicator prior doing any stuff.

I posted an idea in the "cleaning injector" thread, that maybe logging rail pressure over night might indicating injector leaks if a major drop in pressure is seen. Cause chances are either the pressure is lost via fuel regulator (will cause long crank), either it's lost via an injector leak (might cause long crank but depend how it leaks).

However in your case, it's not that obvious, we just can see bank 1 afr is a bit late compared to bank 2 afr, but that is seen on lot of other cars, and when it got back to 234 it's staying there.

When there are rich spike on let off like the o2 going back to 234 but not staying flat and having some multiple dips under 234 might indicating an injector is leaking in the according bank. If one bank is a bit late compared to the other to go to 234, it probably might be because O2 are simply a lazy/tired.

You said you had 3 injectors leaking in the same bank? may I ask which bank ? cause your stft 1/2 & ltft 1/2 seems to mirror by small margin, I would imagine a bigger delta between banks if 3 injectors were leaking in one bank.

I can't remember which bank to be honest, but I remember it was surprising that 3 were leaking but no codes or logs were indicating as such.

It was when fuel consumption was going down the drain that I decided to have the car serviced and found VC cracked and injectors leaking,