Limp Mode Issue

lostkhan · 06-24-2019, 11:30 AM

Hey guys. I'm having an issue with my N54 going into limp mode at first 5 minutes of the session (3-4 Laps AFTER the warm up laps). I first thought it was at WOT, but It happens after hard cornering.

Few Items I looked at which I don't think are the cause.

- Not Oil Temps because they are 250-260F first 5 minutes of the session. (I
did order a 25 row oil cooler though)
- Not boost leak, I recently got the boost leak test and made sure there is no
boost leak

Things I think maybe the issue?

- Boost Solenoid ( I have just ordered new ones and see if it changes
anything)
- e-diff brake heating up? I don't think it will cause any issue at first 5
minutes. I'm running racing brake fluid, performance pads and stainless
steel brake lines. ( Last year I was able to run 15 minutes of session
before I saw oil temps at 270F, never limp mode though)

Anyone else had this issue? What could be wrong?

Current Mods (minus suspension mods):
Mainly boltons. (VRSF 7" IC, VRSF Silicon Inlets, VRSF Chargepipe, VRSF Catless DP). I have not added a tune yet. Waiting to install the bigger oil cooler and MFactory LSD.

dtla1 · 06-24-2019, 03:05 PM

Could be loss of oil pressure? Might be time for you to baffle your oil pan.

lostkhan · 06-24-2019, 03:40 PM

Quote:

Originally Posted by dtla1

Could be loss of oil pressure? Might be time for you to baffle your oil pan.

Quote:

Originally Posted by dtla1

Could be loss of oil pressure? Might be time for you to baffle your oil pan.

If it's oil starvation, that can be scary. I might as well get it installed.

dtla1 · 06-24-2019, 03:45 PM

Yeah, scary for sure. There's some threads on here and on the 3-series board about starvation issues. I really hope that's not your problem though.

Some people tend to add an additional 1/2 liter/quart above full when going on track to help it some as well.

amg6975 · 06-25-2019, 10:38 AM

It could be oil pressure (starvation) I think N54s were notorious for this weren't they?

You're guess about rear brake temperatures could also be totally valid... If the e-diff is engaging, the car will guess what the rear brake temperatures are and if thinks they may be too hot it'll start to cut power. You can/should code all this nonsense off. There's a sticky at the top of the track forum on what to code off.

lostkhan · 06-25-2019, 04:14 PM

Quote:

Originally Posted by amg6975

It could be oil pressure (starvation) I think N54s were notorious for this weren't they?

You're guess about rear brake temperatures could also be totally valid... If the e-diff is engaging, the car will guess what the rear brake temperatures are and if thinks they may be too hot it'll start to cut power. You can/should code all this nonsense off. There's a sticky at the top of the track forum on what to code off.

I read through that sticky. My plan is to code off e-diff system after getting MFactory LSD.

amg6975 · 06-25-2019, 08:01 PM

Quote:

Originally Posted by lostkhan

I read through that sticky. My plan is to code off e-diff system after getting MFactory LSD.

If you have upgraded pads and fluid you can leave the ediff on and just code off the power reduction. I have no problems with 30min track sessions in this configuration.

lostkhan · 06-26-2019, 04:03 PM

Quote:

Originally Posted by amg6975

If you have upgraded pads and fluid you can leave the ediff on and just code off the power reduction. I have no problems with 30min track sessions in this configuration.

Just ordered my oil pan baffle. Now I just need to find a reputable shop who can weld.

I didn't know you can code off power reduction but keep ediff on. Can you please give me more info.

lostkhan · 06-26-2019, 04:12 PM

I'm going to add this DIY here to get back to it.
http://petrolov.com/335i-e-diff-dele...ws-fun-ruiners

dtla1 · 06-26-2019, 04:15 PM

Quote:

Originally Posted by lostkhan

Just ordered my oil pan baffle. Now I just need to find a reputable shop who can weld.

I didn't know you can code off power reduction but keep ediff on. Can you please give me more info.

I think OP in this thread did a good job of outlining track specific parameters we might want to change. He also includes a link to a longer/older thread that goes more in depth regarding performance driving/coding.

https://www.1addicts.com/forums/show....php?t=1626013

amg6975 · 06-26-2019, 04:17 PM

Just change C0A_FLR - Engine Power reduction to wert_00 and leave C0A_DIFF_LOCK as wert_02.

lostkhan · 06-26-2019, 04:24 PM

Quote:

Originally Posted by amg6975

Just change C0A_FLR - Engine Power reduction to wert_00 and leave C0A_DIFF_LOCK as wert_02.

I'll do just that until the LSD is installed.

lostkhan · 06-26-2019, 04:25 PM

Quote:

Originally Posted by dtla1

I think OP in this thread did a good job of outlining track specific parameters we might want to change. He also includes a link to a longer/older thread that goes more in depth regarding performance driving/coding.

https://www.1addicts.com/forums/show....php?t=1626013

Time to start reading

dtla1 · 06-26-2019, 04:35 PM

Quote:

Originally Posted by lostkhan

Time to start reading

There's also the sticky: https://www.1addicts.com/forums/show....php?t=1216642

Not sure if that's still got the latest and greatest info though.

06-24-2019, 11:30 AM	#1
lostkhan Lieutenant 56 Rep 438 Posts Drives: 135i Join Date: Oct 2008 Location: newyork iTrader: (1)	Limp Mode Issue Hey guys. I'm having an issue with my N54 going into limp mode at first 5 minutes of the session (3-4 Laps AFTER the warm up laps). I first thought it was at WOT, but It happens after hard cornering. Few Items I looked at which I don't think are the cause. - Not Oil Temps because they are 250-260F first 5 minutes of the session. (I did order a 25 row oil cooler though) - Not boost leak, I recently got the boost leak test and made sure there is no boost leak Things I think maybe the issue? - Boost Solenoid ( I have just ordered new ones and see if it changes anything) - e-diff brake heating up? I don't think it will cause any issue at first 5 minutes. I'm running racing brake fluid, performance pads and stainless steel brake lines. ( Last year I was able to run 15 minutes of session before I saw oil temps at 270F, never limp mode though) Anyone else had this issue? What could be wrong? Current Mods (minus suspension mods): Mainly boltons. (VRSF 7" IC, VRSF Silicon Inlets, VRSF Chargepipe, VRSF Catless DP). I have not added a tune yet. Waiting to install the bigger oil cooler and MFactory LSD. __________________ BMW 135i 2008 (Current) - Subaru Legacy (DD) - Mountaineer (Hauling) Maxima 95 (Retired) - Acura TL 02 (Retired) - Acura TLS 03 (Retired) - Acura TL 05 (Retired) - Scion tC 2006 (Retired) Audi A4 2003 (Retired) - Jeep Grand Cherokee 96 DD (Retired)
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06-24-2019, 03:05 PM	#2
dtla1 Colonel 828 Rep 2,232 Posts Drives: 2011 135i, Space Grey Join Date: Apr 2014 Location: Silicon Valley iTrader: (2)	Could be loss of oil pressure? Might be time for you to baffle your oil pan.
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06-24-2019, 03:45 PM	#4
dtla1 Colonel 828 Rep 2,232 Posts Drives: 2011 135i, Space Grey Join Date: Apr 2014 Location: Silicon Valley iTrader: (2)	Yeah, scary for sure. There's some threads on here and on the 3-series board about starvation issues. I really hope that's not your problem though. Some people tend to add an additional 1/2 liter/quart above full when going on track to help it some as well.
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06-25-2019, 10:38 AM	#5
amg6975 Captain 496 Rep 642 Posts Drives: '12 M1.5, '05 ZHP, '98 M3/4/5 Join Date: May 2017 Location: Rochester NY iTrader: (0)	It could be oil pressure (starvation) I think N54s were notorious for this weren't they? You're guess about rear brake temperatures could also be totally valid... If the e-diff is engaging, the car will guess what the rear brake temperatures are and if thinks they may be too hot it'll start to cut power. You can/should code all this nonsense off. There's a sticky at the top of the track forum on what to code off.
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06-26-2019, 04:12 PM	#9
lostkhan Lieutenant 56 Rep 438 Posts Drives: 135i Join Date: Oct 2008 Location: newyork iTrader: (1)	I'm going to add this DIY here to get back to it. http://petrolov.com/335i-e-diff-dele...ws-fun-ruiners __________________ BMW 135i 2008 (Current) - Subaru Legacy (DD) - Mountaineer (Hauling) Maxima 95 (Retired) - Acura TL 02 (Retired) - Acura TLS 03 (Retired) - Acura TL 05 (Retired) - Scion tC 2006 (Retired) Audi A4 2003 (Retired) - Jeep Grand Cherokee 96 DD (Retired)
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06-26-2019, 04:17 PM	#11
amg6975 Captain 496 Rep 642 Posts Drives: '12 M1.5, '05 ZHP, '98 M3/4/5 Join Date: May 2017 Location: Rochester NY iTrader: (0)	Just change C0A_FLR - Engine Power reduction to wert_00 and leave C0A_DIFF_LOCK as wert_02.
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