G5 question(s)

j1gilles · 05-19-2013, 06:11 PM

So Im going to finally upgrade my G4 to an G5 and I have a few questions...
-If I upgrade all I will need to do is replace the current G4 control box with the new G5 box correct? The wiring should all be the same...? I do not plan on installing CPS wires.
-With my current mods (listed below) is there any benefit to cutting the diodes and going to the iso?
-I think Ive run into some issues with a cel coming on (throwing fuel pump codes during long pulls/high rpm) does the G5 help with these random pump codes? I run 4 gallons of e85 per fill up (93).
-Side note.... Anyone out there installed the in-line FP in the DIY section?

Thanks for any help!

j1gilles · 05-19-2013, 06:19 PM

-My FuelP data logs on the G4 always show over 15 at wot

stoes · 05-20-2013, 01:03 PM

I believe they are all being sold with the diodes already cut out if you select the ISO version. But aside from that it's a straight plug and play, the only difference is the gauge menus are different from the G4. I recently swapped to the G5 ISO and love it! On the G4 i was maxing out at 15 psi on 5 gallons of E85. Now im constantly hitting 18psi and holding strong at 16.

jrsniper12453 · 05-20-2013, 01:14 PM

-It's not necessarily plug and play. You might have to switch 4 wires. Although I think that's the exception rather than the norm, especially if you never had jb3.

-The iso is the version that's going to be supported more going forward I believe so just stick with that.

-To me those don't sound like "random" fuel codes they sound like an unhappy fuel pump or something. Although g5 is more e85 capable so maybe they'll disappear.

- No idea!

stoes · 05-20-2013, 05:00 PM

My car handled e85 a lot better after going ISO. Before I was running 3 gallons and 4 gallons would throw codes, or ride a little rough at times. Now I can run 6 gallons with 100% confidence...

j1gilles · 05-20-2013, 05:10 PM

Thanks for the help! Im placing the order tonight... I has only hitting 16 (ish) psi using meth with a 40 add. That was also with 4 gallons of e85 so I hope I see some more boost with the G5. Probably going to do a plug change att that times as well. Any suggestions on plugs?... I hear oem is the way to go but I see a few people running NGK 1 step colder plugs.

LAZ · 05-20-2013, 05:25 PM

Quote:

Originally Posted by j1gilles

So Im going to finally upgrade my G4 to an G5 and I have a few questions...
-If I upgrade all I will need to do is replace the current G4 control box with the new G5 box correct? The wiring should all be the same...? I do not plan on installing CPS wires.
-With my current mods (listed below) is there any benefit to cutting the diodes and going to the iso?
-I think Ive run into some issues with a cel coming on (throwing fuel pump codes during long pulls/high rpm) does the G5 help with these random pump codes? I run 4 gallons of e85 per fill up (93).
-Side note.... Anyone out there installed the in-line FP in the DIY section?

Thanks for any help!

I too recently upgraded to the G5 board. I bought my Jb4 back in November and it came with the G4 board, so i upgraded about two weeks ago.. and it made a HUGE difference. Holds boost ALOT more steady and I dont taper down nearly as much. For me it was an easy "unplug G4 brain, plug in G5 brain!" Earlier harnesses (from 2010) may need a few wires swapped to work with the G5, but if yours is not that old then you probably dont need to worry about switching wires...and the diodes no longer need to be cut, as isolated boost come standard for the G5 now. So just switch the brain and your ready to roll! fits perfectly into you same wiring harnasses

j1gilles · 05-20-2013, 05:28 PM

Thanks! I bought mine last Oct so I think I should be fine.... Should have waited a few months for the G5.... Oh well

Marcadelic · 05-20-2013, 05:36 PM

this thread just answered so many questions I had lol, i'll be ordering my g5 soon too

j1gilles · 05-20-2013, 11:01 PM

Just placed my G5 iso order through N54tunning! Anyone with a spark plug suggestion?

LAZ · 05-21-2013, 10:46 AM

Quote:

Originally Posted by j1gilles

Just placed my G5 iso order through N54tunning! Anyone with a spark plug suggestion?

I have heard that OEM is the best way to go...but i have only replaced my plugs once since my purchase. Havent heard much about one step colder plugs but thats only if you ask me.

n54gte · 05-21-2013, 10:56 AM

Quote:

Originally Posted by j1gilles

Just placed my G5 iso order through N54tunning! Anyone with a spark plug suggestion?

Go with oem. Replace every 15-20k!

j1gilles · 05-21-2013, 09:36 PM

Went with OEM.... Thanks!

05-19-2013, 06:11 PM	#1
j1gilles Captain 54 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	G5 question(s) So Im going to finally upgrade my G4 to an G5 and I have a few questions... -If I upgrade all I will need to do is replace the current G4 control box with the new G5 box correct? The wiring should all be the same...? I do not plan on installing CPS wires. -With my current mods (listed below) is there any benefit to cutting the diodes and going to the iso? -I think Ive run into some issues with a cel coming on (throwing fuel pump codes during long pulls/high rpm) does the G5 help with these random pump codes? I run 4 gallons of e85 per fill up (93). -Side note.... Anyone out there installed the in-line FP in the DIY section? Thanks for any help! __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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05-19-2013, 06:19 PM	#2
j1gilles Captain 54 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	-My FuelP data logs on the G4 always show over 15 at wot __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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05-20-2013, 01:03 PM	#3
stoes Private First Class 45 Rep 167 Posts Drives: 2010 e92 M3 Join Date: Sep 2011 Location: houston iTrader: (0)	I believe they are all being sold with the diodes already cut out if you select the ISO version. But aside from that it's a straight plug and play, the only difference is the gauge menus are different from the G4. I recently swapped to the G5 ISO and love it! On the G4 i was maxing out at 15 psi on 5 gallons of E85. Now im constantly hitting 18psi and holding strong at 16. __________________ 2010 e92 M3
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05-20-2013, 01:14 PM	#4
jrsniper12453 Second Lieutenant 15 Rep 229 Posts Drives: 335i Join Date: Mar 2008 Location: Las Vegas/LA iTrader: (0)	-It's not necessarily plug and play. You might have to switch 4 wires. Although I think that's the exception rather than the norm, especially if you never had jb3. -The iso is the version that's going to be supported more going forward I believe so just stick with that. -To me those don't sound like "random" fuel codes they sound like an unhappy fuel pump or something. Although g5 is more e85 capable so maybe they'll disappear. - No idea! __________________ 2007 335i, Space Gray, Black/Alum, Sports, Prem, CA, Navi, iPod
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05-20-2013, 05:00 PM	#5
stoes Private First Class 45 Rep 167 Posts Drives: 2010 e92 M3 Join Date: Sep 2011 Location: houston iTrader: (0)	My car handled e85 a lot better after going ISO. Before I was running 3 gallons and 4 gallons would throw codes, or ride a little rough at times. Now I can run 6 gallons with 100% confidence... __________________ 2010 e92 M3
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05-20-2013, 05:10 PM	#6
j1gilles Captain 54 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	Thanks for the help! Im placing the order tonight... I has only hitting 16 (ish) psi using meth with a 40 add. That was also with 4 gallons of e85 so I hope I see some more boost with the G5. Probably going to do a plug change att that times as well. Any suggestions on plugs?... I hear oem is the way to go but I see a few people running NGK 1 step colder plugs. __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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05-20-2013, 05:28 PM	#8
j1gilles Captain 54 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	Thanks! I bought mine last Oct so I think I should be fine.... Should have waited a few months for the G5.... Oh well __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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05-20-2013, 05:36 PM	#9
Marcadelic Instagram: @Marcadelic 259 Rep 2,697 Posts Drives: 335is Join Date: Jan 2010 Location: Tampa iTrader: (4)	this thread just answered so many questions I had lol, i'll be ordering my g5 soon too __________________ \| Currrent: 2021 G80 M3 & 2018 X5M Old: F80 / e90 M3 / e92 335i / 335is \| Instagram: Marcadelic \|
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05-20-2013, 11:01 PM	#10
j1gilles Captain 54 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	Just placed my G5 iso order through N54tunning! Anyone with a spark plug suggestion? __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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05-21-2013, 09:36 PM	#13
j1gilles Captain 54 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	Went with OEM.... Thanks! __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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