[shervi]

So I have been struggling to figure out why my long term fuel trims(LTFT) have been sustained at 30% more fuel. It turns out my hpfp is pushing 2 bars higher pressure across the rev range.

My question is this. As anyone else had an issues with the hpfp over pressurizing, or over fueling. The car is a N55 M135i 2014 with 127k km on the clock. Is the hpfp on its way out? Should I be changing it? I mean, don't we want the higher pressure, especially seeing that I have a map on the car (bootmod3). I just changed the injector profile to Nostrum stage 2 to compensate for the higher fuel input, and everything is working out well at the moment. Just not sure if I should keep it this way, or get the fuel pump changed. I mean is this a good thing or not? lol

Datalogs for confirmation
https://www.bootmod3.net/log?id=665b...62d16a7f179256
https://www.bootmod3.net/log?id=665b...62d16a7f179257
https://www.bootmod3.net/log?id=665b...62d16a7f179258

[shervi]

Also, just speaking to my mechanic, he says 2 bars over should be ok for these cars?

[-Eidos]

Originally Posted by shervi

So I have been struggling to figure out why my long term fuel trims(LTFT) have been sustained at 30% more fuel. It turns out my hpfp is pushing 2 bars higher pressure across the rev range.

My question is this. As anyone else had an issues with the hpfp over pressurizing, or over fueling. The car is a N55 M135i 2014 with 127k km on the clock. Is the hpfp on its way out? Should I be changing it? I mean, don't we want the higher pressure, especially seeing that I have a map on the car (bootmod3). I just changed the injector profile to Nostrum stage 2 to compensate for the higher fuel input, and everything is working out well at the moment. Just not sure if I should keep it this way, or get the fuel pump changed. I mean is this a good thing or not? lol

Datalogs for confirmation
https://www.bootmod3.net/log?id=665be8664c62d16a7f179256
https://www.bootmod3.net/log?id=665be8a44c62d16a7f179257
https://www.bootmod3.net/log?id=665be8d14c62d16a7f179258

I might be out of date with my BM3 naming knowledge but it looks like the DME is removing fuel based on your LTFT and STFT?

If the Nostrum Stage 2 config (highly recommend not running this config without the injectors btw) is helping then maybe you have some leaky injectors.

[n55david]

Uhm..

If you don't have the nostrum injectors.. change it the fuck back 😆 🤣

Also, you have serious throttle closures. Take a log with the correct injectors setting and post it.

What mods and what map are you using?

[shervi]

Originally Posted by n55david

Uhm..

If you don't have the nostrum injectors.. change it the fuck back 😆 🤣

Also, you have serious throttle closures. Take a log with the correct injectors setting and post it.

What mods and what map are you using?

This is with he car just idling. On the stock injector and stock hpfp profile.

https://www.bootmod3.net/log?id=67c5...cad113a347dda7

Just a stage 2 bootmod3 map, decatted and an AFE momentum intake. If I put the old one back, which I have tried before the overfuelling goes down by 15%


In the past we have put a new DME (old one was fried). Everything was working well until one day about a year later this thing popped up.

The car has a new
pre throttle map sensor
Maf Sensor
Fuel rail pressure sensor
Pre and Post O2 sensor
NEw Valve cover
New coil and injectors ( spark plugs changed as well to 1 stop colder)
Both vanos solenoids

If I remove the oil cap the fuel trims go back to normal. So I just changed the pcv valve in case by some miracle it had broken down.

Could anyone post there car at idle, so I can compare logs? I am really confused here.