[SRHosein]

Hi all,

Has anyone upgraded the B58 injectors?
I was looking at the S58 injectors.

Reason for not going port injection is that there are none available for B48 platform.

I am thinking if HPFP upgraded to B58TU, pressure sensor upgraded and injectors, it may work with some tuning changes.

Thank you.

Regards,
Shane

[Glemm1970]

Originally Posted by SRHosein

Hi all,

Has anyone upgraded the B58 injectors?
I was looking at the S58 injectors.

Reason for not going port injection is that there are none available for B48 platform.

I am thinking if HPFP upgraded to B58TU, pressure sensor upgraded and injectors, it may work with some tuning changes.

Thank you.

Regards,
Shane

This is not possible on F models. On G models it is necessary to check. While everyone is installing the PI / WMI Port on the G model.

[G.Newt]

There's B58 upgraded injectors in the works.

[cfm56d7b]

Originally Posted by SRHosein

Hi all,

Has anyone upgraded the B58 injectors?
I was looking at the S58 injectors.

Reason for not going port injection is that there are none available for B48 platform.

I am thinking if HPFP upgraded to B58TU, pressure sensor upgraded and injectors, it may work with some tuning changes.

Thank you.

Regards,
Shane

What's the goal of switching to S58 injectors? More horsepower?

Echoing an earlier comment: not possible. DME monitors and controls a myriad of metrics: timing, fuel mixture - to name a few. Injectors are designed to serve a specific design envelope and are not easily substituted.

PS. There are many other options to increase horsepower.

[G.Newt]

Originally Posted by cfm56d7b

What's the goal of switching to S58 injectors? More horsepower?

Echoing an earlier comment: not possible. DME monitors and controls a myriad of metrics: timing, fuel mixture - to name a few. Injectors are designed to serve a specific design envelope and are not easily substituted.

PS. There are many other options to increase horsepower.

The goal? Upgrading the DI system so you don't need PI, which introduces additional maintenance and failure points.

[blacksapphire440i]

Originally Posted by G.Newt

The goal? Upgrading the DI system so you don't need PI, which introduces additional maintenance and failure points.

Wouldnt Port Injection (as a supporting mod) be more beneficial than DI alone? I thought our cars build up carbon in the intake manifold part due to no fuel being dumped there.

[lens]

Originally Posted by blacksapphire440i

Wouldnt Port Injection (as a supporting mod) be more beneficial than DI alone? I thought our cars build up carbon in the intake manifold part due to no fuel being dumped there.

Yes, but carbon buildup in the intake isn't a thing since N55. I've done it on mine 3 times, about 60k miles in-between, and there wasn't barely any, N54 had the most issues where there was literally a clump of it.

Port injection is fairly dangerous as if it fails, or leaks, you're going to flood your engine. A friend of mine with a bigboost 3.3 kit and PI had his fail on his M235i, and flooded the engine with fuel. The oil smelled like fuel and he had to flush it 3 times before he sold it to the next poor soul.

[SRHosein]

Originally Posted by cfm56d7b

What's the goal of switching to S58 injectors? More horsepower?

Echoing an earlier comment: not possible. DME monitors and controls a myriad of metrics: timing, fuel mixture - to name a few. Injectors are designed to serve a specific design envelope and are not easily substituted.

PS. There are many other options to increase horsepower.

The reason would be to increasing fueling. I am on B48 platform and maxing out HPFP with meth cpi. I am thinking after I upgrade HPFP, the injectors may max out shortly after.

There are not many options available (no port injection). Hence the reason to look at upgrading injectors.

Also if S58 injectors can physically fit, it can be programmed via the tune and would be a great option.

Having one set of injectors controlled by ECU would be a great option.
No additional pumps, injectors, lines, ect.
Hence less components to fail.

[weehe126]

Originally Posted by SRHosein

The reason would be to increasing fueling. I am on B48 platform and maxing out HPFP with meth cpi. I am thinking after I upgrade HPFP, the injectors may max out shortly after.

There are not many options available (no port injection). Hence the reason to look at upgrading injectors.

Also if S58 injectors can physically fit, it can be programmed via the tune and would be a great option.

Having one set of injectors controlled by ECU would be a great option.
No additional pumps, injectors, lines, ect.
Hence less components to fail.

Have you read of anyone running out of injector? What power level are you looking for? I feel like you are looking into something more complex than needed unless you plan on building the motor and are going for 700+whp.

[sqwinny]

Originally Posted by weehe126

Have you read of anyone running out of injector? What power level are you looking for? I feel like you are looking into something more complex than needed unless you plan on building the motor and are going for 700+whp.

He has a fully built b48. On the n20/n55/s55, you can swap in s63tu injectors to have about 25-40% more flow. Sure a custom tune + upgraded HPFP is necessary, but they work with install + coding via ISTA+.

Link to his build thread:

Shane's BMW B48 Engine Build https://f30.bimmerpost.com/forums/sh....php?t=1864478

[kern417]

Again, a few points to remind everyone

- The S58 injectors are the same as B58TU injectors
- The B58TU/S58 injectors will not fit the Gen 1 B58
- There is an assumptions that they flow more or are an "upgrade" but that is not the case

[blacksapphire440i]

Originally Posted by chaungo

Yes, but carbon buildup in the intake isn't a thing since N55. I've done it on mine 3 times, about 60k miles in-between, and there wasn't barely any, N54 had the most issues where there was literally a clump of it.

Port injection is fairly dangerous as if it fails, or leaks, you're going to flood your engine. A friend of mine with a bigboost 3.3 kit and PI had his fail on his M235i, and flooded the engine with fuel. The oil smelled like fuel and he had to flush it 3 times before he sold it to the next poor soul.

Perfect. Would I be able to use chargepipe injection as a supporting mod? I'd only wanna use it for cooling and not for any major power gains

[SRHosein]

Originally Posted by kern417

Again, a few points to remind everyone

- The S58 injectors are the same as B58TU injectors
- The B58TU/S58 injectors will not fit the Gen 1 B58
- There is an assumptions that they flow more or are an "upgrade" but that is not the case

I believe the part numbers are different for all.
The B48/B58 part numbers for injectors - 13538625396 (HPFP about 2800psi stock).
The B48TU/B58TU part numbers for injectors - 13538656548 (HPFP about 5000psi stock).
The S58 part numbers for injectors - 13538671991.

I know a few people checking on these as potential upgrades or other injectors as well, if I get a solution, will update you all.

Some people stated the reliability of the B48/B58 1st gen injectors drop when running above 3000psi or so; I have not tested.

[SRHosein]

Update on injectors:
The b48/b58 1st gen injectors are different from the b48tu/b58tu injectors.
The tu injectors have a smaller tip and will fit loose on the b48/b58 1st gens head.
The S58 injectors should be similar size as b58tu injectors.
I am not sure if the M5 injectors will fit but if it does, the rail will need modifications as it's a screw type injector.

[McBobby Jr]

Is there an update on this? Will there ever be an actual injector upgrade on this platform?

[Fast_Rabbi]

Why ? I don't think our injector has been max out once.

[McBobby Jr]

Originally Posted by Fast_Rabbi

Why ? I don't think our injector has been max out once.

I was curious if there was anything being developed, but it looks like development for HPFP has slowed down. It would have been awesome if this platform had dual HPFP like the S55/S58.

[blacksapphire440i]

Originally Posted by McBobby Jr

I was curious if there was anything being developed, but it looks like development for HPFP has slowed down. It would have been awesome if this platform had dual HPFP like the S55/S58.

Why not go port injection with a DS2? 750cc injectors are enough for 700whp+ and it is relatively safe now with REFLEX+ (paired with MHD) and the aluminum intake manifold.

[McBobby Jr]

Originally Posted by blacksapphire440i

Why not go port injection with a DS2? 750cc injectors are enough for 700whp+ and it is relatively safe now with REFLEX+ (paired with MHD) and the aluminum intake manifold.

I really like the simplicity of direct injection and it’s knock resistance. Yes, you are right about Re|Flex I wouldn’t go with any other controller. With the introduction of Re|Flex and sequential injector control it is much more safe and reliable compared to previous systems. I’ll go port injection eventually, but I want to really utilize what is possible with the direct injection system before I go port.

[Fast_Rabbi]

Spool will release upgraded injector soon.

[McBobby Jr]

Originally Posted by Fast_Rabbi

Spool will release upgraded injector soon.

For Gen 1 or Gen 2?

[kern417]

apparently both. we'll see