Hi everyone,
I have gone from a stock 135i (N54) low pressure fuel pump due to low psi (52-42psi) readings at idle and throughout RPM range (rail pressure would drop and cause limp mode), to a walbro 450 and have retained the bucket and Venturi to keep it close to stock as possible and hopefully food my low psi issue..
I get a 2AAF fuel pump plausibility error at times.
Haven't really driven car yet as build has had stuff to complete first.
After installing the walbro pump I've notice via mhd the LPFP psi starts off with 49psi after a minute or so the psi drops to 39psi.
When idle the fuel rail pressure sits at 700ish which seems to me as fine?
When trying to log some information I see the HPFP psi on rail drop along side the LPFPs psi.
However the rail pressure seems to me within okay limits like 3000-1800psi as the rpm increase.
I currently have;
Inlets 2"
DCI filters
Vrsf outlets slightly modified for RHD
Hybrid turbos via eBay seller. TD04L 17T billet.
5" intercooler
Larger engine oil cooler
Walbro 450 pump
I haven't tried a new fuel pressure sensor yet.
I'm wondering it it'll be a tune based issue as it's currently a tune I've made based off v8 baits spreadsheet and logs before the donor 135i was crashed ( stock turbos then).
LPFP with stock pump was fine before the donor car was crashed. Since the engine swap haven't had any luck with the psi . Car doesn't throw any limp mode codes so far.
Does anyone else have some ideas that might help be fix this or is it a not issue?? I'm worried that I shouldn't drive due to this mostly.
Thanks forum
Here's a datazap link for a log to Reference
I have gone from a stock 135i (N54) low pressure fuel pump due to low psi (52-42psi) readings at idle and throughout RPM range (rail pressure would drop and cause limp mode), to a walbro 450 and have retained the bucket and Venturi to keep it close to stock as possible and hopefully food my low psi issue..
I get a 2AAF fuel pump plausibility error at times.
Haven't really driven car yet as build has had stuff to complete first.
After installing the walbro pump I've notice via mhd the LPFP psi starts off with 49psi after a minute or so the psi drops to 39psi.
When idle the fuel rail pressure sits at 700ish which seems to me as fine?
When trying to log some information I see the HPFP psi on rail drop along side the LPFPs psi.
However the rail pressure seems to me within okay limits like 3000-1800psi as the rpm increase.
I currently have;
Inlets 2"
DCI filters
Vrsf outlets slightly modified for RHD
Hybrid turbos via eBay seller. TD04L 17T billet.
5" intercooler
Larger engine oil cooler
Walbro 450 pump
I haven't tried a new fuel pressure sensor yet.
I'm wondering it it'll be a tune based issue as it's currently a tune I've made based off v8 baits spreadsheet and logs before the donor 135i was crashed ( stock turbos then).
LPFP with stock pump was fine before the donor car was crashed. Since the engine swap haven't had any luck with the psi . Car doesn't throw any limp mode codes so far.
Does anyone else have some ideas that might help be fix this or is it a not issue?? I'm worried that I shouldn't drive due to this mostly.
Thanks forum
Here's a datazap link for a log to Reference