N54Tech.com - International Turbo Racing Discussion
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MooreOfDerek MooreOfDerek is offline
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Default N54 Boost to Octane Limits? - 11-13-2016, 06:46 PM

Hello,

I am just curious about the limitations with the N54 Engine concerning boost to Octane.

Usually I run 93 Octane, once in a while I might run 30% e85 but, I have plans on upgrading my LPFP to Fuel-IT Stage 2 allowing me to run higher concentrations E85.

I am curious as to where the limits are with both 93 octane and, 30%+ E85 (More info the better when E85 is in the picture. If you can safely run XXpsi with XX% E85 please notate that)

Any and all advice is appreciated.

I look forward to reading what you guys suggest / have experienced with high boost levels with different fuels.
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brainsurgery brainsurgery is offline
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Default 11-14-2016, 12:53 AM

I run E85 flash and 50/50 93oct/E85 and map5 targets and boosts 18psi without major timing corrections. That should be pretty safe.


335i LCI xDrive AT, JB4, ***, Stage1 LPFP, MHD E85 flash.
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MooreOfDerek MooreOfDerek is offline
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Default 11-14-2016, 10:01 AM

Quote:
Originally Posted by brainsurgery
I run E85 flash and 50/50 93oct/E85 and map5 targets and boosts 18psi without major timing corrections. That should be pretty safe.
Do you use the flash alone or are you also using the JB4? Im pretty sure my car likes everything thats going on but, on 93 only it will hit 16-17(max) psi at WOT..

So, How come running 100ish octane you are only hitting 18 o.O
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klipseracer klipseracer is offline
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Default 11-14-2016, 10:03 AM

This is really isn't a one size fits all response, but narrowing it down by turbo types would help. A big single is going to have a much different power ceiling than say stock twins on the same fuel. That goes without saying. So are you asking about the stock turbos specifically?
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MooreOfDerek MooreOfDerek is offline
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Default 11-14-2016, 10:16 AM

Quote:
Originally Posted by klipseracer
This is really isn't a one size fits all response, but narrowing it down by turbo types would help. A big single is going to have a much different power ceiling than say stock twins on the same fuel. That goes without saying. So are you asking about the stock turbos specifically?
Well, I am on stock turbos (Refreshed about 15k miles ago). No issues so far running 16-17psi 93octane. but, to my knowledge higher octane will support higher boost levels.
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brainsurgery brainsurgery is offline
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Default 11-14-2016, 10:52 AM

Quote:
Originally Posted by MooreOfDerek
Do you use the flash alone or are you also using the JB4? Im pretty sure my car likes everything thats going on but, on 93 only it will hit 16-17(max) psi at WOT..

So, How come running 100ish octane you are only hitting 18 o.O
Because 18psi is the maximum map5 targets.

I can also run map7 (20psi) but I get a bit more timing corrections. Also my HPFP is almost maxed out on 20psi so when using map5 I don't have to care so much about the mixture.

If you are not running any BEF and hit 17psi on 93 octane I bet your timing does not look very good.


335i LCI xDrive AT, JB4, ***, Stage1 LPFP, MHD E85 flash.
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MooreOfDerek MooreOfDerek is offline
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Default 11-14-2016, 11:45 AM

http://www.n54tech.com/forums/showthread.php?t=43452
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snelson3003 snelson3003 is offline
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Default 11-14-2016, 01:06 PM

on E55 fueling you should be able to target 19.8psi (map 7) but will need the E85 BEF to help with the AFR decay up top so the HPFP doesnt crash.

After E55-E65ish youll find that the HPFP cant keep up and will dive. So after that you will need meth or PI.


498WHP / 516TQ : 10/29/16

VTT Stage 1 + Billet Wheel | VTT Inlets | VTT PCV Valve | JB4 G5 ISO | BMS E85 Flash | Fuel It Stage 2 | ECS TwinTake| Stett Vacuum Canisters | Hartge Stepped FMIC | VRSF DP | 91Oct w/E50 | BMS Cowl Filters | Located in Denver, Colorado - High Altitude!

Maintenance: EKPM3-DE @ 74K | Water pump & T-stat @ 70K | Valve Cover @ 50K | VTT Turbo @ 70K | HPFP @ 65K | Walnut Blasting @ 65K | 6 Injectors @ 55K | Vacuum lines @ 55K | Spark Plugs @ 75K | Boost Solenoid @ 65K
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MooreOfDerek MooreOfDerek is offline
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Default 11-14-2016, 01:29 PM

Quote:
Originally Posted by snelson3003
on E55 fueling you should be able to target 19.8psi (map 7) but will need the E85 BEF to help with the AFR decay up top so the HPFP doesnt crash.

After E55-E65ish youll find that the HPFP cant keep up and will dive. So after that you will need meth or PI.
That would be awesome to be able to push, but would you recommend FMIC before stage 2 LPFP to help with IATs to maybe prevent some corrections?
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snelson3003 snelson3003 is offline
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Default 11-14-2016, 01:32 PM

Yes i would. You dont need anything crazy for a FMIC i got mine off ebay and it works perfectly. Paid like 280 for it and its a bolt in unit that uses to OEM hoses and C-clips.

IAT's and octane usually cause timing corrections so get those done and you should be good to go. Just remember to log log log and post here so i can review them and give you feedback.


498WHP / 516TQ : 10/29/16

VTT Stage 1 + Billet Wheel | VTT Inlets | VTT PCV Valve | JB4 G5 ISO | BMS E85 Flash | Fuel It Stage 2 | ECS TwinTake| Stett Vacuum Canisters | Hartge Stepped FMIC | VRSF DP | 91Oct w/E50 | BMS Cowl Filters | Located in Denver, Colorado - High Altitude!

Maintenance: EKPM3-DE @ 74K | Water pump & T-stat @ 70K | Valve Cover @ 50K | VTT Turbo @ 70K | HPFP @ 65K | Walnut Blasting @ 65K | 6 Injectors @ 55K | Vacuum lines @ 55K | Spark Plugs @ 75K | Boost Solenoid @ 65K
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MooreOfDerek MooreOfDerek is offline
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Default 11-14-2016, 02:13 PM

Quote:
Originally Posted by snelson3003
Yes i would. You dont need anything crazy for a FMIC i got mine off ebay and it works perfectly. Paid like 280 for it and its a bolt in unit that uses to OEM hoses and C-clips.

IAT's and octane usually cause timing corrections so get those done and you should be good to go. Just remember to log log log and post here so i can review them and give you feedback.
Would you mind if I kept you as a contact to either bounce ideas off of or to reach out to for assistance? I am a fast learner so, Don't worry it wont be a constant thing but, I enjoy talking to people that have a lot of experience with this. (:
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snelson3003 snelson3003 is offline
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Default 11-14-2016, 02:43 PM

Feel free to do so. Also you can hop on *********** - its a new forum for n54/n55 owners that I tend to spend more time on for now.


498WHP / 516TQ : 10/29/16

VTT Stage 1 + Billet Wheel | VTT Inlets | VTT PCV Valve | JB4 G5 ISO | BMS E85 Flash | Fuel It Stage 2 | ECS TwinTake| Stett Vacuum Canisters | Hartge Stepped FMIC | VRSF DP | 91Oct w/E50 | BMS Cowl Filters | Located in Denver, Colorado - High Altitude!

Maintenance: EKPM3-DE @ 74K | Water pump & T-stat @ 70K | Valve Cover @ 50K | VTT Turbo @ 70K | HPFP @ 65K | Walnut Blasting @ 65K | 6 Injectors @ 55K | Vacuum lines @ 55K | Spark Plugs @ 75K | Boost Solenoid @ 65K
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snelson3003 snelson3003 is offline
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Default 11-14-2016, 02:53 PM

sp00lstreet.com


498WHP / 516TQ : 10/29/16

VTT Stage 1 + Billet Wheel | VTT Inlets | VTT PCV Valve | JB4 G5 ISO | BMS E85 Flash | Fuel It Stage 2 | ECS TwinTake| Stett Vacuum Canisters | Hartge Stepped FMIC | VRSF DP | 91Oct w/E50 | BMS Cowl Filters | Located in Denver, Colorado - High Altitude!

Maintenance: EKPM3-DE @ 74K | Water pump & T-stat @ 70K | Valve Cover @ 50K | VTT Turbo @ 70K | HPFP @ 65K | Walnut Blasting @ 65K | 6 Injectors @ 55K | Vacuum lines @ 55K | Spark Plugs @ 75K | Boost Solenoid @ 65K
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seroga1986 seroga1986 is offline
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Default 11-14-2016, 07:01 PM

Logging is your best friend. I personally run E55 blend mixed with 93 and run 25-26psi peak, 20psi tapering near redline on stock turbos. On BMS e85 desensitized knock tables flash. Its rips hard. Enough to stay door to door with a 2016 Cobb stage 2 GTR.


2008 135i Sport 6at
JB4 G5 ISO, MHD E85 KR, Fuel-it S1, E55 Mix, Alpina Trans Flash, afe Scoops, My own custom 2.5" inlets, ER CP, Synapse BOV, 3.5 Tmap, 7.5" Phoenix FMIC, NGK 5992, 3" BMS downtubes, N55 Mids, Berk Race, BMS OCC, 48 plate oil cooler, 36 plate trans fluid cooler, PSS, R888, Hoosier DRs.
11.92@123.6 (JB4 ISO, DCI, IC, **, DR, on e45 & 17psi)(2013)
444whp/481wtq @19psi and e60 (2013)

2013 X3 xDrive28i M-package
JB4, K&N drop-in, ER downtube, Map 2 @ 22psi on 93
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