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      02-14-2021, 10:21 PM   #23
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Do you guys think the F10 M5 EU5 Injectors on stock fuelling system would be able to extract as much power on a custom E40 tune on full bolt ons and VTT GCs?
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      02-14-2021, 10:25 PM   #24
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FWIW, while a N55, there's some good data here: https://f87.bimmerpost.com/forums/sh....php?t=1782572

Given the nature of the single piston HPFP, we weren't able to push the stock injectors as hard as the S55 guys can, the EU5 injectors went in the same time as the "stage 3" HPFP.

Yes EU5 injectors are not a direct drop in, a tune with proper calibrations, Injector compensation values coded via ISTA is required also.
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      02-15-2021, 02:10 PM   #25
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Quote:
Originally Posted by chetrickerman View Post
For the record, the F10 EU5 injectors flow 903 g/min, and the OEM S55 EU6 injectors flow 821 g/min. That's from a Bosch fuel system engineer.
As you are no doubt aware, the M5 EU5 (and early EU6) injectors were flawed and instead of correcting, BMW just extended the warranty on them in the 5 Series Autos to 10 years (for the PWG/EU5). No idea how that impacts the injectors purchased and installed in a 3/4 model?

Thus wondering how much the F10/EU6 flow as they were revised after several years to correct the issues
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      02-15-2021, 07:22 PM   #26
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Quote:
Originally Posted by YASBBYM3 View Post
As you are no doubt aware, the M5 EU5 (and early EU6) injectors were flawed and instead of correcting, BMW just extended the warranty on them in the 5 Series Autos to 10 years (for the PWG/EU5). No idea how that impacts the injectors purchased and installed in a 3/4 model?

Thus wondering how much the F10/EU6 flow as they were revised after several years to correct the issues
I have heard from a few other tuners that the F10 EU6 injectors are prone to failure
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      02-16-2021, 11:58 AM   #27
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Quote:
Originally Posted by chetrickerman View Post
I have heard from a few other tuners that the F10 EU6 injectors are prone to failure
Yes the early EU6 13537645956 injectors had the same failures as the EU5 13647599876. Using the earlier EU6 would be prone to same failure. The EU6 was redesigned with the 13538627842 but supposedly cannot be used in an EU5.

https://f10.m5post.com/forums/showthread.php?t=1462695
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      03-21-2021, 09:35 PM   #28
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Bump. Anyone else went or thinking going this route?
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      03-22-2021, 01:08 AM   #29
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Quote:
Originally Posted by ///BMW Junkie View Post
Bump. Anyone else went or thinking going this route?
What fuel type are you running? Are you running out of injector? HPFP?
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      03-22-2021, 08:28 AM   #30
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Quote:
Originally Posted by -Eidos View Post
Quote:
Originally Posted by ///BMW Junkie View Post
Bump. Anyone else went or thinking going this route?
What fuel type are you running? Are you running out of injector? HPFP?
Stock fuel system and looking to go E85
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      03-22-2021, 11:23 AM   #31
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Well after vehicle diagnosis/OBD check and tune, I'm sure they won't cover it.
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      03-22-2021, 11:26 AM   #32
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Quote:
Originally Posted by ///BMW Junkie View Post
Stock fuel system and looking to go E85
As long as your tuner can calibrate for the EU5 injectors properly, it's a solid upgrade. I run them on my N55 M2 - just buy the injectors and decoupling elements from FCP Euro for the free exchanges.

Looks like your stock HPFPs have more room as well to support the higher ceiling provided by the EU5 injectors, but you'll eventually want the HPFP upgrade anyways:

https://f80.bimmerpost.com/forums/sh...&postcount=123
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      03-22-2021, 11:39 AM   #33
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I'm definitely looking this direction for an S55 motor build I'm planning to hang GC turbos on. Before the plan was E85 through EU6 plus PI+LPFP for added fueling and valve wash. Now I'm looking at E85 through the bigger EU5 plus HPFP+LPFP.

The thing that has me on the fence is losing valve wash, but I may be overthinking. I could add meth to get the wash back...my IATs in summer aren't so high I need cooling.

Limiting factor for me is my 6MT with stock clutch. I don't like breaking stuff and prefer to add improvements before catastrophes.
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      03-22-2021, 11:49 AM   #34
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Quote:
Originally Posted by TopJimmy View Post
I'm definitely looking this direction for an S55 motor build I'm planning to hang GC turbos on. Before the plan was E85 through EU6 plus PI+LPFP for added fueling and valve wash. Now I'm looking at E85 through the bigger EU5 plus HPFP+LPFP.

The thing that has me on the fence is losing valve wash, but I may be overthinking. I could add meth to get the wash back...my IATs in summer aren't so high I need cooling.

Limiting factor for me is my 6MT with stock clutch. I don't like breaking stuff and prefer to add improvements before catastrophes.
Why do we loose valve wash exactly?
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      03-22-2021, 03:43 PM   #35
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Quote:
Originally Posted by ///BMW Junkie View Post
Quote:
Originally Posted by TopJimmy View Post
I'm definitely looking this direction for an S55 motor build I'm planning to hang GC turbos on. Before the plan was E85 through EU6 plus PI+LPFP for added fueling and valve wash. Now I'm looking at E85 through the bigger EU5 plus HPFP+LPFP.

The thing that has me on the fence is losing valve wash, but I may be overthinking. I could add meth to get the wash back...my IATs in summer aren't so high I need cooling.

Limiting factor for me is my 6MT with stock clutch. I don't like breaking stuff and prefer to add improvements before catastrophes.
Why do we loose valve wash exactly?
PI and/or meth spray provides some washing action to the valves, but it adds another system to control. With "upgraded" DI we get increased capacity on the one high fuel delivery accuracy system (built in DME).
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      03-22-2021, 06:56 PM   #36
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Quote:
Originally Posted by TopJimmy View Post
The thing that has me on the fence is losing valve wash, but I may be overthinking. I could add meth to get the wash back...my IATs in summer aren't so high I need cooling.
Switch to water instead of meth if you donít need fuel but have this concern. It cleans, cools and reduces detonation. You donít blow up your motor when the pump fails. I may have been through some things with aquamist on a previous car. Haha
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      03-22-2021, 07:27 PM   #37
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Quote:
Originally Posted by coxxoc View Post
Quote:
Originally Posted by TopJimmy View Post
The thing that has me on the fence is losing valve wash, but I may be overthinking. I could add meth to get the wash back...my IATs in summer aren't so high I need cooling.
Switch to water instead of meth if you don't need fuel but have this concern. It cleans, cools and reduces detonation. You don't blow up your motor when the pump fails. I may have been through some things with aquamist on a previous car. Haha
That's good thinking! An EOS manifold could be plumbed for port nozzles, and a water leak is no biggie. I like it.
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      03-29-2021, 11:01 PM   #38
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Has anyone heard about the rough idle with EU5's?
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      03-31-2021, 02:39 PM   #39
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Quote:
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Has anyone heard about the rough idle with EU5's?
I've heard only one tuner who has perfected the M5 injector swap including smooth idle, and that's Halim@HCP. Kratos said he's been doing testing work for them with the big squirters, and he has it all smoothed out.
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      03-31-2021, 05:03 PM   #40
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Quote:
Originally Posted by TopJimmy View Post
Quote:
Originally Posted by ///BMW Junkie View Post
Has anyone heard about the rough idle with EU5's?
I've heard only one tuner who has perfected the M5 injector swap including smooth idle, and that's Halim@HCP. Kratos said he's been doing testing work for them with the big squirters, and he has it all smoothed out.
I tried reaching out to HCP a couple times with no response. F80Paul has been tuning with EU5's as well.
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      04-01-2021, 07:56 AM   #41
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Quote:
Originally Posted by ///BMW Junkie View Post
Has anyone heard about the rough idle with EU5's?
Get someone that knows what's needed to calibrate and tune them correctly, no idle issues. My car idles fine, even with cat warm up turned off. It was even better when I had cold start turned on.
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      04-01-2021, 08:04 AM   #42
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Halim's guys replied same day that they can do an EU5 93 tune for $600. They said an E85 tune might cost a little more depending on how many revisions you need.
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      04-01-2021, 08:18 AM   #43
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Quote:
Originally Posted by TopJimmy View Post
Halim's guys replied same day that they can do an EU5 93 tune for $600. They said an E85 tune might cost a little more depending on how many revisions you need.
I installed the injectors in the morning, calibrated in ISTA and had the base map with perfect idle before lunch time. Car was ripping by end of the day like I was still on factory injectors.

https://abperformance.ge/ is who tuned my car. Another great option outside of F80paul and HCP.
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Last edited by belittle; 04-01-2021 at 08:27 AM..
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      04-01-2021, 08:44 AM   #44
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Quote:
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Halim's guys replied same day that they can do an EU5 93 tune for $600. They said an E85 tune might cost a little more depending on how many revisions you need.
How did you reach them? HCP website?
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