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JBoe JBoe is offline
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Default 07-11-2019, 05:06 PM

Quote:
Originally Posted by rf30a
Thanks for the feedback Terry. What level would you say is concerning on the fuel pressure? Under 15, under 12? Just trying to get an idea to help me when I am looking at logs.

Thanks!
I'd like to know this as well.
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MasterYous MasterYous is offline
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Default 07-11-2019, 08:09 PM

Quote:
Originally Posted by JBoe
I'd like to know this as well.
There is a post somewhere that says 1 = 150 so 7 and higher is probably needed. If you go lower than 7 there may be something to worry about. HTH.


2017 F23/M240i Convertible (B58) / 6MT / FF Wires / EWG Wires / BMS Air Intake / Stock Exhaust / BMS Meth (100%) / 93 Octane
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JBoe JBoe is offline
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Default 07-11-2019, 09:29 PM

Quote:
Originally Posted by MasterYous
There is a post somewhere that says 1 = 150 so 7 and higher is probably needed. If you go lower than 7 there may be something to worry about. HTH.
I had seen a few posts about it, but Terry was still dialing in the ratio. Also, I don't remember seeing a post where he provided minimal levels. Hopefully, he'll respond soon to clarify.

With all that's changed on our firmware versions, it's probably time to update the "Settings" thread's first posts. That's always been our go-to resource.
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(#279)
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MasterYous MasterYous is offline
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Default 07-12-2019, 08:42 AM

The info you seek is in here.
Quote:
Originally Posted by Terry @ BMS
Adding JB4 v13 firmware to the first post to collect some data.

JB4 v13 firmware:

1) Added active safety system for high fuel pressure. JB4 will revert to safety is fuel pressure drops below 7 (1000psi) during full throttle.
2) Moved safety/VALET map to map8
3) Adjusted map4 to be a performance map between map3 and map5. With the BEF map4 targets around 20psi
4) Adjusted FF learning to be slightly more aggressive.
Implication to me is 7 is your "safe" minimum. I'm pretty sure 1 = 150 in terms of scaling as was posted in a post by Terry somewhere on this thread. Unless Terry changed it very recently, I log with MHD logger and they don't scale HPFP (reported in actual PSI); I have compared to JB4 at full idle (change logging collection method in JB4 app to "raw sampling" and log for 15 seconds), and the math worked out like that.


2017 F23/M240i Convertible (B58) / 6MT / FF Wires / EWG Wires / BMS Air Intake / Stock Exhaust / BMS Meth (100%) / 93 Octane
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JBoe JBoe is offline
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Default 07-12-2019, 06:52 PM

Thanks for the info... I'm a bit confused now. A few posts back a member was told his fuel pressure was tanking, but it never dropped below 10-11. Thus, still safe.
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(#281)
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MasterYous MasterYous is offline
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Default 07-12-2019, 06:58 PM

I read that post:
Quote:
Originally Posted by Terry @ BMS
Fuel pressure is tanking a bit here despite boost being under target, I'd drop back down to map3.
I think the implication here isnít that safety was being triggered, but rather that lowering pressure over time was a sign that the map was too aggressive?


2017 F23/M240i Convertible (B58) / 6MT / FF Wires / EWG Wires / BMS Air Intake / Stock Exhaust / BMS Meth (100%) / 93 Octane
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rf30a rf30a is offline
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Default 07-12-2019, 07:23 PM

I am going to try some boostane with an e25 or e30 mix to see if I can keep both timing and fuel pressure happy.

But Terry mentioned that my pressure was tanking when it dropped to 11 so would be good to get a better explanation. A more aggressive map would naturally have higher fuel demands but if trims, timing and fuel pressures are reasonable then it should be okay I would think.

Obviously we are all still in somewhat uncharted territory with the BEF.

Last edited by rf30a; 07-13-2019 at 04:00 AM..
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MasterYous MasterYous is offline
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Default 07-12-2019, 08:10 PM

Boostane won’t help with fuel pressure since it’s not fuel. It’s an additive which will help with timing since it raises octane. Fuel and octane are not the same thing.


2017 F23/M240i Convertible (B58) / 6MT / FF Wires / EWG Wires / BMS Air Intake / Stock Exhaust / BMS Meth (100%) / 93 Octane
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rf30a rf30a is offline
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Default 07-13-2019, 03:58 AM

I understand but running less ethanol will help with fuel pressures.
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JBoe JBoe is offline
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Default 07-13-2019, 08:34 AM

Quote:
Originally Posted by rf30a
I understand but running less ethanol will help with fuel pressures.
Yes and to counter the octane decrease you can use an additive. I do that with straight 91 by using half a can of the Boostane 116 additive. I haven't seen any fuel pressure issues, but at 110+ degrees ambient air temps, my timing is gone. Lol. Car is fast but high IATs have the DME pulling timing so it's not like it was.

I'd still like a little insight on the fuel pressure side. It's a relatively new addition to our tuning paramaters. I feel I have a solid knowledge of the others.
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rf30a rf30a is offline
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Default 07-13-2019, 09:50 AM

Attached are map 4 and 5 logs with 93 octane base e30 and 8oz of boostane.
Attached Files
File Type: csv 2019-07-13 12_14_06_Map-4.csv (20.3 KB, 3 views)
File Type: csv 2019-07-13 12_31_16_Map-5.csv (9.3 KB, 4 views)
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MasterYous MasterYous is offline
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Default 07-13-2019, 09:57 AM

Quote:
Originally Posted by JBoe
Yes and to counter the octane decrease you can use an additive. I do that with straight 91 by using half a can of the Boostane 116 additive. I haven't seen any fuel pressure issues, but at 110+ degrees ambient air temps, my timing is gone. Lol. Car is fast but high IATs have the DME pulling timing so it's not like it was.
Here are four things you can do to fight the IAT battle:
1) use the stock intake
2) use the AP intake (it’s pricey)
3) if you’ve bought the MHD flasher license, flash and use performance (or track) cooling mode. It makes a noticeable difference in IAT, I’ve seen 10 degrees cooler.
4) inject more water in your meth mix. really depends on the trade offs you’re willing to deal with on this last one.


2017 F23/M240i Convertible (B58) / 6MT / FF Wires / EWG Wires / BMS Air Intake / Stock Exhaust / BMS Meth (100%) / 93 Octane
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CntryClub007 CntryClub007 is offline
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Default 07-14-2019, 12:25 AM

Quote:
Originally Posted by MasterYous
People with b58 and xdrive have done it...
Well...I pulled a 3.39 using M2 and not really trying very hard, haha.
B58 Powered 340i Goes 11.40's on Meth @ 2,000' DA - PLUS Custom AWE Exhaust - N54Tech.com - International Turbo Racing Discussion


| 2016 BMW 340i | M-Sport |
| CG Catted + AWE | BMS Intake | FTP Turbo Inlet + CP | JB4 + MHD BEF | XHP Stage 3 | BMS Meth Kit | VP M1
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