I believe I just blew up my N54.

tc535i · 11-30-2015, 12:40 PM

Quote:

Originally Posted by Mike@N54Tuning.com

The DME itself has no good run lean safety. It will let you run along at full boost with AFR at 18:1 in either bank without limping. I've seen it myself in logs. Whatever safety is built in to the DME is going to work the same whether or not a JB4 is installed. If the DME goes limp the JB4 does also. It's programmed that way.

The JB4 run lean safety will go to map4 if AFR goes leaner than 14:1 for more than a second, fuel pressure drops below 750psi for more than a second, etc.

Mike

are these safeties still active when running 4/2 backend?

csu87 · 11-30-2015, 12:55 PM

Quote:

Originally Posted by tc535i

are these safeties still active when running 4/2 backend?

yes. The JB4 retains all the safeties with a backend

MachWon · 11-30-2015, 12:59 PM

I was not kicked to map 4. I just went outside and checked, and the car is still in map 7.

csu87 · 11-30-2015, 01:07 PM

The problem with any tune is that an engine can blow before any failsafe kicks in, which appears to be what happened in your case.

Antetokounmpo · 11-30-2015, 01:13 PM

I thought jb4 had a failsafe for the hpfp? If it wasn't high enough, I thought it went into safety mode?

MachWon · 11-30-2015, 01:14 PM

I understand. Oh well, lesson learned the hard way. It's been a fun platform but I don't think I can justify spending 5k to get a 12k car running again. I'll probably just take the loss and sell the car like it is.

MachWon · 11-30-2015, 01:14 PM

Quote:

Originally Posted by Heel Toe

I thought jb4 had a failsafe for the hpfp? If it wasn't high enough, I thought it went into safety mode?

It does, it just didn't activate in time I guess.

924er · 11-30-2015, 03:23 PM

Jb4 alone or any piggyback is never safe when running that much power, it just doesn't control enough parameters.. I Learned my lesson the hard way as well. Now I'm doing flashes with a custom tune.

j1gilles · 11-30-2015, 06:58 PM

Quote:

Originally Posted by MachWon

I understand. Oh well, lesson learned the hard way. It's been a fun platform but I don't think I can justify spending 5k to get a 12k car running again. I'll probably just take the loss and sell the car like it is.

Do a compression test first... You might have lucked out and just have an injector stuck open.

jtswole · 12-02-2015, 05:52 AM

I said long before he posted the log, that the hpfp tanked lol. A ton of people don't know how to measure e85 by volume, correctly, from what I gather. People think, running 6 gallons of e85, is e40 mix lol.

catcher22 · 12-02-2015, 11:29 AM

This scares the crap out of me. I'm just waiting for the day my high mileage E92 blows up or something major goes wrong. So far most of my fixes have been under $1500.

I think I'm on borrowed time here, just saving up my $$ for that day...

Miller335 · 12-02-2015, 11:54 AM

Quote:

Originally Posted by jtswole

I said long before he posted the log, that the hpfp tanked lol. A ton of people don't know how to measure e85 by volume, correctly, from what I gather. People think, running 6 gallons of e85, is e40 mix lol.

According to the E85 calculator 6 gallons of E85 to 10 gallons of premium is E38.

jtswole · 12-03-2015, 05:27 AM

Quote:

Originally Posted by Miller335

According to the E85 calculator 6 gallons of E85 to 10 gallons of premium is E38.

Not winter blend.

YouAreMyWorld · 12-03-2015, 04:00 PM

This is exactly why I'll only be dealing with Pump Gas. Even if my knowledge on 'blends' wasn't rudimentary, I don't have the patience to accurately measure every time.. especially when the negative effects can lead to this.

No thanks, I'll survive with less power.

KiwiRD · 12-03-2015, 04:09 PM

Quote:

Originally Posted by YouAreMyWorld

This is exactly why I'll only be dealing with Pump Gas. Even if my knowledge on 'blends' is rudimentary, I don't have the patience to accurately measure every time.. especially when the negative effects can lead to this.

No thanks, I'll survive with less power.

I'm happy running 93 / 98 RON as well. It seems some people are prepared to risk some pretty catastrophic failures just to eek every last ounce of power from their engine.

JDuke335i · 12-03-2015, 04:10 PM

Quote:

Originally Posted by jtswole

Quote:

Originally Posted by Miller335

According to the E85 calculator 6 gallons of E85 to 10 gallons of premium is E38.

Not winter blend.

I live beside Raleigh , N.C and the station I go to never switches to a winter blend. ( for the last 2 years anyways ) I guess our weather doesn't get cold enough to go to winter blend.

Miller335 · 12-03-2015, 04:22 PM

Quote:

Originally Posted by jtswole

Not winter blend.

No winter blend around my area.
I still test it from time to time though.

Nitrousbird · 12-03-2015, 04:28 PM

Quote:

Originally Posted by 924er

Jb4 alone or any piggyback is never safe when running that much power, it just doesn't control enough parameters.. I Learned my lesson the hard way as well. Now I'm doing flashes with a custom tune.

You can run both. It's called a backend flash. What benefit would there be to a flash only vs JB4 + backend flash?

924er · 12-03-2015, 04:35 PM

Quote:

Originally Posted by Nitrousbird

Quote:

Originally Posted by 924er

Jb4 alone or any piggyback is never safe when running that much power, it just doesn't control enough parameters.. I Learned my lesson the hard way as well. Now I'm doing flashes with a custom tune.

You can run both. It's called a backend flash. What benefit would there be to a flash only vs JB4 + backend flash?

That's why I said a "piggyback alone" and trust me there are people out there only running that and like 7 gallons of e85

theweebabySeamus · 12-06-2015, 11:25 AM

There's a long block in the Turbo section for 1300 right now.

Jeff@TopGearSolutions · 12-06-2015, 12:05 PM

Quote:

Originally Posted by Miller335

According to the E85 calculator 6 gallons of E85 to 10 gallons of premium is E38.

That would assume people nearly drain their tanks. I put in 13.8 gallons after my E light went on yesterday. Ive never put a full 16 gallon in any of me E92.

Plus it's not really a good idea to drive around trying to get every last drop out as the bottom of the tank usually has sediment.

6 gallons would be too much for most trying to achieve E40, unless they almost drained their tanks empty and did a combined 16 gallon fill up. I think the tank technically holds a little over 17.

HeavyMetalRocker · 12-06-2015, 12:18 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

That would assume people nearly drain their tanks. I put in 13.8 gallons after my E light went on yesterday. Ive never put a full 16 gallon in any of me E92.

Plus it's not really a good idea to drive around trying to get every last drop out as the bottom of the tank usually has sediment.

6 gallons would be too much for most trying to achieve E40, unless they almost drained their tanks empty and did a combined 16 gallon fill up. I think the tank technically holds a little over 17.

That is correct sir... lol I had the unfortunate time of driving it through E because my float got stuck! Took just about 17 exactly to go from dead empty to full!

For the math illiterate;http://www.intercepteft.com/calc.html

11-30-2015, 12:59 PM	#47
MachWon Private First Class 25 Rep 197 Posts Drives: 2007 335i 6mt. JB4 + CDP's. Join Date: Mar 2015 Location: . iTrader: (0)	I was not kicked to map 4. I just went outside and checked, and the car is still in map 7.
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11-30-2015, 01:07 PM	#48
csu87 Banned 2134 Rep 3,554 Posts Drives: 09 335xi Join Date: Nov 2013 Location: Northern Colorado iTrader: (0)	The problem with any tune is that an engine can blow before any failsafe kicks in, which appears to be what happened in your case.
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11-30-2015, 01:13 PM	#49
Antetokounmpo Brigadier General 1550 Rep 3,475 Posts Drives: E90 6MT FBO; '18 F150 Platinum Join Date: Jul 2013 Location: WI iTrader: (3) Garage List 2018 Ford F-150 Pla ... [0.00] 2008 BMW 335xi [0.00]	I thought jb4 had a failsafe for the hpfp? If it wasn't high enough, I thought it went into safety mode?
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11-30-2015, 01:14 PM	#50
MachWon Private First Class 25 Rep 197 Posts Drives: 2007 335i 6mt. JB4 + CDP's. Join Date: Mar 2015 Location: . iTrader: (0)	I understand. Oh well, lesson learned the hard way. It's been a fun platform but I don't think I can justify spending 5k to get a 12k car running again. I'll probably just take the loss and sell the car like it is.
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11-30-2015, 03:23 PM	#52
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	Jb4 alone or any piggyback is never safe when running that much power, it just doesn't control enough parameters.. I Learned my lesson the hard way as well. Now I'm doing flashes with a custom tune. __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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12-02-2015, 05:52 AM	#54
jtswole First Lieutenant 42 Rep 380 Posts Drives: 335i Join Date: Mar 2014 Location: FL iTrader: (1)	I said long before he posted the log, that the hpfp tanked lol. A ton of people don't know how to measure e85 by volume, correctly, from what I gather. People think, running 6 gallons of e85, is e40 mix lol. __________________ Cam only...
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12-02-2015, 11:29 AM	#55
catcher22 Captain 294 Rep 922 Posts Drives: 2008 335xi Coupe Join Date: May 2008 Location: Virginia iTrader: (2)	This scares the crap out of me. I'm just waiting for the day my high mileage E92 blows up or something major goes wrong. So far most of my fixes have been under $1500. I think I'm on borrowed time here, just saving up my $$ for that day...
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12-03-2015, 04:00 PM	#58
YouAreMyWorld ///Project Aura 389 Rep 889 Posts Drives: Mineral White ///M-Sport 335i Join Date: Feb 2015 Location: Los Angeles iTrader: (0)	This is exactly why I'll only be dealing with Pump Gas. Even if my knowledge on 'blends' wasn't rudimentary, I don't have the patience to accurately measure every time.. especially when the negative effects can lead to this. No thanks, I'll survive with less power. Last edited by YouAreMyWorld; 12-03-2015 at 04:51 PM..
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12-06-2015, 11:25 AM	#64
theweebabySeamus Captain 373 Rep 902 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	There's a long block in the Turbo section for 1300 right now.
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