newbie question about limp mode + track days...

jeho · 04-24-2008, 11:26 PM

I was reading how guys with JB2 / V2 get limp modes 2 laps in during track days..

What is causing the 335i to get into limp mode? Is it because they are not running 96+ gas with the tune?
Also, will the 335i limp on stock ecu?

I plan on running jb2hh + dp and want to know what I need to prevent it
from going into limp mode

S4to335 · 04-24-2008, 11:51 PM

The car has various limp mode levels depending on what the car "thinks" is happening. Most of the limp modes associated with track days have to do with overheating. There is a debate however on what parameter is being measured. Some postulate that it is oil temp. I have personally gotten what I consider high oil temps on track. I am an instructor and I go pretty hard..and with ambient air temps of about 80 degrees..I was getting oil temps in the 285 range with a stock program and OEM oil. My car is a 6spd..with the oil cooler from the factory. I am not aware of anything particular to the JuiceBox2 or Vishnu Procede v2 that sets off limp modes when taken on track. I think it has more to do with going on track itself and the oil or water temps that are experienced. If I was running a tuned car..I would add a bit of extra octane in the car to take full advantage of the tune....I do this with my SSTT...and run about 95-96 octane on track now.

Hope this helps. Just watch your temps and let off a bit and cool down the car if you experience oil temps at or above 280.

jeho · 04-25-2008, 02:15 AM

so you dont encounter limp modes every 2-3 laps like a post i remember seeing,
unfortunately i cant find it right now...

So it'll be fine to track the car, just be cautious and keep an eye out on the oil temps? Have you tried running thicker oil because i know for STi owners,
in the summer when they track they run thicker oil to compensate for the heat...

S4to335 · 04-25-2008, 09:40 AM

I have never encountered limp modes on track..or any other time for that matter..(in this car...I have in other cars)

I have run 10-60W BMW Motorsport Oil (for the M cars) in my car..and temps were down a bit. I would only do this in hot weather..NOT cold. When it gets hot here in California again..I will be switching back to the more robust Motorsport oil.

HP Autosport · 04-25-2008, 09:51 AM

Quote:

Originally Posted by S4to335

I have never encountered limp modes on track..or any other time for that matter..(in this car...I have in other cars)

I have run 10-60W BMW Motorsport Oil (for the M cars) in my car..and temps were down a bit. I would only do this in hot weather..NOT cold. When it gets hot here in California again..I will be switching back to the more robust Motorsport oil.

Did you know using a higher viscosity oil will actually increase oil temps?

S4to335 · 04-25-2008, 10:14 AM

Quote:

Originally Posted by HP Autowerks

Did you know using a higher viscosity oil will actually increase oil temps?

I talked with the chief BMW tech at my dealership..he was actually my student at the HOD event at Laguna...and he said using the Motorsport Oil was fine in the 335i. Where did you get your information from. I am not doubting it..just curious to read more about it. Thanks.

jeho · 04-25-2008, 10:34 AM

yeah i thought a higher viscosity oil (1 step thicker) would hold more temp / take longer to heat up in extremely hot weather since the regular oil will become too thin from the high heat?

K335i · 04-25-2008, 04:02 PM

Quote:

Originally Posted by jho86

so you dont encounter limp modes every 2-3 laps like a post i remember seeing,
unfortunately i cant find it right now...

So it'll be fine to track the car, just be cautious and keep an eye out on the oil temps? Have you tried running thicker oil because i know for STi owners,
in the summer when they track they run thicker oil to compensate for the heat...

I've had limps at the track before, and it definitely didn't have anything to do with the temps. There are two main issues with tunes - either the boost is too high for track use and/or you're not running good enough gas. Fixing one of those is sometimes enough but fixing both is your best bet. When I go to the track, I run at least 2psi lower and try to fill up with a mix of gas that gets me to about 96 octane. So far, I've had no problems with this formula.

2e9x's · 04-26-2008, 09:38 AM

Knock on wood...my one track experience with my tuned 335i (SSTT) was very positive. Normal operation throughout the day. One user had an issue with Procede v2.0 at the track until he dialed-in his torque settings appropriately. Then his car was fine.

Dascamel · 04-27-2008, 02:04 PM

On a warm day, don't increase boost.

04-24-2008, 11:26 PM	#1
jeho ig: jeffersonho 148 Rep 2,182 Posts Drives: E90M3.E36M3 Join Date: Mar 2008 Location: PNW iTrader: (6)	newbie question about limp mode + track days... I was reading how guys with JB2 / V2 get limp modes 2 laps in during track days.. What is causing the 335i to get into limp mode? Is it because they are not running 96+ gas with the tune? Also, will the 335i limp on stock ecu? I plan on running jb2hh + dp and want to know what I need to prevent it from going into limp mode __________________ E36 M3 on TE37SL E90 M3 on TE37SL http://instagram.com/jeffersonho
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04-24-2008, 11:51 PM	#2
S4to335 Brigadier General 434 Rep 4,380 Posts Drives: 2014 Audi A4 / 91 Track Miata Join Date: Jan 2007 Location: San Jose, CA iTrader: (5) Garage List 2007 BMW 335i sedan [8.00]	The car has various limp mode levels depending on what the car "thinks" is happening. Most of the limp modes associated with track days have to do with overheating. There is a debate however on what parameter is being measured. Some postulate that it is oil temp. I have personally gotten what I consider high oil temps on track. I am an instructor and I go pretty hard..and with ambient air temps of about 80 degrees..I was getting oil temps in the 285 range with a stock program and OEM oil. My car is a 6spd..with the oil cooler from the factory. I am not aware of anything particular to the JuiceBox2 or Vishnu Procede v2 that sets off limp modes when taken on track. I think it has more to do with going on track itself and the oil or water temps that are experienced. If I was running a tuned car..I would add a bit of extra octane in the car to take full advantage of the tune....I do this with my SSTT...and run about 95-96 octane on track now. Hope this helps. Just watch your temps and let off a bit and cool down the car if you experience oil temps at or above 280. __________________ Car is now gone .... :-(
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04-25-2008, 02:15 AM	#3
jeho ig: jeffersonho 148 Rep 2,182 Posts Drives: E90M3.E36M3 Join Date: Mar 2008 Location: PNW iTrader: (6)	so you dont encounter limp modes every 2-3 laps like a post i remember seeing, unfortunately i cant find it right now... So it'll be fine to track the car, just be cautious and keep an eye out on the oil temps? Have you tried running thicker oil because i know for STi owners, in the summer when they track they run thicker oil to compensate for the heat... __________________ E36 M3 on TE37SL E90 M3 on TE37SL http://instagram.com/jeffersonho
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04-25-2008, 09:40 AM	#4
S4to335 Brigadier General 434 Rep 4,380 Posts Drives: 2014 Audi A4 / 91 Track Miata Join Date: Jan 2007 Location: San Jose, CA iTrader: (5) Garage List 2007 BMW 335i sedan [8.00]	I have never encountered limp modes on track..or any other time for that matter..(in this car...I have in other cars) I have run 10-60W BMW Motorsport Oil (for the M cars) in my car..and temps were down a bit. I would only do this in hot weather..NOT cold. When it gets hot here in California again..I will be switching back to the more robust Motorsport oil. __________________ Car is now gone .... :-(
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04-25-2008, 10:34 AM	#7
jeho ig: jeffersonho 148 Rep 2,182 Posts Drives: E90M3.E36M3 Join Date: Mar 2008 Location: PNW iTrader: (6)	yeah i thought a higher viscosity oil (1 step thicker) would hold more temp / take longer to heat up in extremely hot weather since the regular oil will become too thin from the high heat? __________________ E36 M3 on TE37SL E90 M3 on TE37SL http://instagram.com/jeffersonho
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04-26-2008, 09:38 AM	#9
2e9x's Major 50 Rep 1,137 Posts Drives: 335i ED 7/07 Join Date: Dec 2006 Location: A Sunny Place iTrader: (2)	Knock on wood...my one track experience with my tuned 335i (SSTT) was very positive. Normal operation throughout the day. One user had an issue with Procede v2.0 at the track until he dialed-in his torque settings appropriately. Then his car was fine. __________________ 2010 Evo X - silver with a big, stupid wing on the back 2009 VW CC - Black/Black - with a 2011 328i on order to replace it - ED 8/1/11
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04-27-2008, 02:04 PM	#10
Dascamel Lieutenant Colonel 48 Rep 1,664 Posts Drives: 2008 e92 M3, 2010 e91 328i Join Date: Jul 2007 Location: Bakersfield, CA iTrader: (0)	On a warm day, don't increase boost. __________________ 2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim 2010 E91 328i Space Gray,Black int, M sport, most options 2007 Montego Blue 335i (retired)
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