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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > car got VERY PISSED map 7... WHY?



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      08-11-2013, 09:16 AM   #1
4doorbmwpower
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car got VERY PISSED map 7... WHY?

so I put my JB4 (g5) into map 7 with a 50/50 e85 blend and went wide open after a few pulls in map 5 it was strong as ever. at about 80 on the map 7 pull when the PSI was rising up past 16-17 service engine started flashing my hazards auto went on and exhaust note went to a missfire weak note lost a ton of power and bogged on over to a parking spot. exhaust smell was a RICH fuel smell and i shut her down read the 8 codes it fired up and cleared them. started it up all symptoms gone switched to map 5 did a pull... back to strong as ever..

My assumption is it doesnt like e85 blends for the racing map, that mixed with my methanol injection is down for the count right now due to a leak in the system.

Thoughts?
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      08-11-2013, 09:19 AM   #2
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List the codes.
Try to imitate it and pull a log
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      08-11-2013, 09:39 AM   #3
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to scared to do it again. it was like they blew but they didnt. codes were 2FD2, EE32, A172, 9D02, 9CC0, 0000
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      08-11-2013, 09:47 AM   #4
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U probably leaned out and missfired.
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      08-11-2013, 10:20 AM   #5
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50/50 is not enough octane for map 7
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      08-11-2013, 10:22 AM   #6
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Map 7 is a 100% race gas map. 50/50 E85 is a Map 5 mix.
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      08-11-2013, 10:24 AM   #7
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Quote:
Originally Posted by BEAR-AvHistory View Post
Map 7 is a 100% race gas map. 50/50 E85 is a Map 5 mix.
+1 stick to map 5 with a 17 psi cap on that kind of mixture. if you have a backend flash its a YMMV kinda thing.
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      08-11-2013, 10:40 AM   #8
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thanks guys i figured that was the case.
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      08-11-2013, 04:02 PM   #9
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When switching to a more aggressive map, always do some logging before you go all-out to make sure everything looks good.
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      08-11-2013, 04:09 PM   #10
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I run 50/50, map 7 with BMS flash, and it works well for me, no timing drops or codes thrown.
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      08-11-2013, 04:13 PM   #11
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Quote:
Originally Posted by themyst
Quote:
Originally Posted by BEAR-AvHistory View Post
Map 7 is a 100% race gas map. 50/50 E85 is a Map 5 mix.
+1 stick to map 5 with a 17 psi cap on that kind of mixture. if you have a backend flash its a YMMV kinda thing.
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      08-11-2013, 04:14 PM   #12
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Quote:
Originally Posted by SfValley335i
I run 50/50, map 7 with BMS flash, and it works well for me, no timing drops or codes thrown.
You have the required back end flash though.....OP doesn't.
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      08-11-2013, 05:31 PM   #13
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Quote:
Originally Posted by AWil335i
When switching to a more aggressive map, always do some logging before you go all-out to make sure everything looks good.
This!! And especially when switching from an aggressive map to a not so aggressive map with different fuel (such as e85/100 to pump gas)
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      08-11-2013, 08:29 PM   #14
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Quote:
Originally Posted by SfValley335i View Post
I run 50/50, map 7 with BMS flash, and it works well for me, no timing drops or codes thrown.
+1 i'm good with 8 gallons of E85 and the flash on map 7
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      08-11-2013, 10:11 PM   #15
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Did you read the FAQ on JB4 E85 use?


Quote:
Can I use E85 ethanol fuel with the JB4? If so what mixture should I use?

1) Generally speaking you can run 30-40% E85 without the need for logging or worrying about fuel trims, fuel pressure, etc. Just mix E85 in and select map 5. Done.
2) For those wanting to run higher mixtures (and more power) then you need to datalog. You'll want to first look at your low fuel pressure in the JB4 logs. If that is dropping below 50 then you're maxing out the low fuel pressure and should either reduce the E85 mixture or add a Walbro 255 inline. It's a $100 pump and is easy to install.
3) Next up look at fuel trims. If they are exceeding 50 in the JB4 logs & open loop is already at 90-100, or if you get 29F2 codes from having too high of an open loop, then you need to add the BMS back end flash for E85 fuels to extend the fueling range. The E85 flash also features VANOS changes, higher than factory timing advance, and some other stuff designed to help make more power on E85.
4) Finally after the flash and low pressure pump, you need to keep an eye on the high pressure pump. If it drops below 9 @ wide open throttle then you're maxing out the high pressure pump and need to lower the E85 mixture or lower the boost in the areas where it's dropping below 10. Right now there is no viable high pressure pump update. The only known solution that works is to add meth at this point. This is why BMS suggests 60-70% E85 and not 100% E85. The 100% E85 works the fuel system harder with no power benefit over say 70%.
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      08-11-2013, 10:31 PM   #16
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Quote:
Originally Posted by Mike@N54Tuning.com
Did you read the FAQ on JB4 E85 use?


Quote:
Can I use E85 ethanol fuel with the JB4? If so what mixture should I use?

1) Generally speaking you can run 30-40% E85 without the need for logging or worrying about fuel trims, fuel pressure, etc. Just mix E85 in and select map 5. Done.
2) For those wanting to run higher mixtures (and more power) then you need to datalog. You'll want to first look at your low fuel pressure in the JB4 logs. If that is dropping below 50 then you're maxing out the low fuel pressure and should either reduce the E85 mixture or add a Walbro 255 inline. It's a $100 pump and is easy to install.
3) Next up look at fuel trims. If they are exceeding 50 in the JB4 logs & open loop is already at 90-100, or if you get 29F2 codes from having too high of an open loop, then you need to add the BMS back end flash for E85 fuels to extend the fueling range. The E85 flash also features VANOS changes, higher than factory timing advance, and some other stuff designed to help make more power on E85.
4) Finally after the flash and low pressure pump, you need to keep an eye on the high pressure pump. If it drops below 9 @ wide open throttle then you're maxing out the high pressure pump and need to lower the E85 mixture or lower the boost in the areas where it's dropping below 10. Right now there is no viable high pressure pump update. The only known solution that works is to add meth at this point. This is why BMS suggests 60-70% E85 and not 100% E85. The 100% E85 works the fuel system harder with no power benefit over say 70%.
+1

C'mon, man
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      08-12-2013, 06:33 AM   #17
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Mike that is EXACTLY what i was looking for! thanks a ton, and im sure this will help out more people than just myself!

+1
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