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B4x Injector Flow Rate Data

Comprehensive injector flow rate data for BMW B48, B46, B48TU, B46TU, and B48E engines.

Figures are calculated based on available online information and average BSFC for each fuel.

Gen 2 & Up injectors do not fit in Gen 1 engines due to a 6.5mm injector tip vs 7mm on Gen 1. Gen 2 injectors only flow the same or more than Gen 1 equivalents at 5000PSI.

BMW B4x Gen 1 Injector Flow Rate Info

InjectorFlow @3600PSIFlow @2900PSIRated PressureBMW Part #Requires TuneCompatibility
B48/B46 EU6Est. 950CCEst. 850CC20mPa/2900PSI13538625396NoB4x Gen 1 Only
IFX150Est. 1425CCEst. 1250CC29mPa/4200PSIN/AYesB4x Gen 1 Only
XDI +40% InjectorsEst. 1330CCEst. 1200CC25mPa/3600PSIN/AYesB4x Gen 1 Only
XDI +75% InjectorsEst. 1660CCEst. 1490CC25mPa/3600PSIN/AYesB4x Gen 1 Only
Nostrum S1Est. 1280CCEst. 1150CC25mPa/3600PSIN/AYesB4x Gen 1 Only
Nostrum S2Est. 1570CCEst. 1400CC25mPa/3600PSIN/AYesB4x Gen 1 Only

BMW B4xTU and B48E Injector Flow Rate Info

InjectorFlow @5000PSIRated PressureBMW Part #Requires TuneCompatibility
B48/B46TU EU6Est. 1000CC35mPa/5000PSI13538656548NoB4xTU and B48E
B48E(B48T1)/S58Est. 1300CC35mPa/5000PSI13538671991Only If Swapped With B48E/S58B4xTU and B48E
IFX350Est. 1300CC39mPa/5600PSIN/AYesB4xTU and B48E
IFX350XEst. 1700CC39mPa/5600PSIN/AYesB4xTU and B48E
XDI +40% InjectorsEst. 1430CC40mPa/5800PSIN/AYesB4xTU and B48E

BMW B4x Gen 1 Injector Max WHP

Injector93 OCT @2900PSI93 OCT @3600PSIE85 @2900PSIE85 @3600PSI
B48/B46 EU6405450310345
IFX150586668423482
XDI +40% Injectors563624406450
XDI +75% Injectors700778505562
Nostrum S1547607419467
Nostrum S2668742512570

BMW B4xTU and B48E Injector Max WHP

InjectorMax WHP 93 OCT @5000PSIMax WHP E85 @5000PSI
B48/B46TU EU6460350
B48E(B48T1)/S58 EU6600455
IFX350600455
IFX350X800576
XDI +40% Injectors660500
HPFP & LPFP DataSpark Plug Info