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      06-24-2019, 11:30 AM   #1
lostkhan
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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.
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      06-24-2019, 03:05 PM   #2
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Could be loss of oil pressure? Might be time for you to baffle your oil pan.
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      06-24-2019, 03:40 PM   #3
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Quote:
Originally Posted by dtla1 View Post
Could be loss of oil pressure? Might be time for you to baffle your oil pan.
Quote:
Originally Posted by dtla1 View Post
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.
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      06-24-2019, 03:45 PM   #4
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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
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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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      06-25-2019, 04:14 PM   #6
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Quote:
Originally Posted by amg6975 View Post
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.
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      06-25-2019, 08:01 PM   #7
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Quote:
Originally Posted by lostkhan View Post
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.
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      06-26-2019, 04:03 PM   #8
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Quote:
Originally Posted by amg6975 View Post
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.
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      06-26-2019, 04:12 PM   #9
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I'm going to add this DIY here to get back to it.
http://petrolov.com/335i-e-diff-dele...ws-fun-ruiners
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      06-26-2019, 04:15 PM   #10
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Quote:
Originally Posted by lostkhan View Post
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
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      06-26-2019, 04:17 PM   #11
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Just change C0A_FLR - Engine Power reduction to wert_00 and leave C0A_DIFF_LOCK as wert_02.
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      06-26-2019, 04:24 PM   #12
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Quote:
Originally Posted by amg6975 View Post
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.
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      06-26-2019, 04:25 PM   #13
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Quote:
Originally Posted by dtla1 View Post
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
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      06-26-2019, 04:35 PM   #14
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Quote:
Originally Posted by lostkhan View Post
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.
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