335 doesnt perform as well during....

A2G · 07-06-2010, 06:19 PM

warmer/humid weather conditions? yesterday the car was very slow and revving it above 5k rpm was a miracle to pull off...anyone else have the same problem?

335isGuy · 07-06-2010, 07:13 PM

That sounds really bad, but thats Heat Soak for ya. That is a Turbo/SC cars enemy is heat. Bigger FMIC and Aquamist!

redline2 · 07-06-2010, 07:17 PM

Generally speaking, hot moist air is bad, cold dry air is good. Air pressure also plays a role in normally aspirated cars as it impacts the air/fuel mixture. If you Google "Dyno correction factors" you will see formulas to calibrate for air density and atmospheric pressure. Forced air induction (your turbo 335xi) overcomes atmospheric pressure by forcing air into your engine by means of the exhaust driven turbocharger. Intercooler performance is also reduced since difficult to cool the turbocharger pressurized hot air when the ambient air is also also hot.

All sorts of sensors inline to help achieve ideal air/fuel mixtures but you will indeed feel a difference.

Your air conditioner blasting also doesn't help due to the parasitic load the compressor puts on the engine.

dpwr · 07-06-2010, 08:51 PM

it does loose some performance but nothing like "the car was very slow and revving it above 5k rpm was a miracle to pull off"... as above states heat is FI's enemy

jasonintoronto · 07-06-2010, 08:54 PM

all turbo cars lose power due to heat soak, although the 335i is better prepped than others. not being able to rev above 5k? that's not normal. if you're exaggerating, ok. if not, take it to the dealer.

OwnAge · 07-06-2010, 09:58 PM

No wonder my car felt slow when i have AC running full blast

JulieDriving · 07-06-2010, 10:39 PM

No wonder my car felt a little sluggish at first...

Good to know, tks.

Eclipse · 07-06-2010, 10:55 PM

yea the car feels really sluggish wen its really hot out...

DimSum · 07-07-2010, 02:22 AM

heatsoak for all the BMW engines...
Even for the N52.

335isGuy · 07-07-2010, 07:15 AM

Quote:

Originally Posted by DimSum

heatsoak for all the BMW engines...
Even for the N52.

No your right all motors experience Heat Soak. But its more so on FI cars.

samej · 07-07-2010, 08:05 AM

Not normal unless were you in heavy traffic? I had a run to and from the airport this week and my oil temps were fine (temps were 34-35C).

2kaccordocoupe · 07-07-2010, 08:33 AM

high ambient air temps + high humidity = less dense air

your car cannot dissipate the heat nor can it utilize dense air for combustion resulting in sub par performance

simple grade school physics

335isGuy · 07-07-2010, 08:37 AM

Quote:

Originally Posted by 2kaccordocoupe

high ambient air temp + high humidity = less dense air

your car cannot dissipate the heat nor can it utilize dense air for combustion resulting in sub par perforamnce

simple grade school physics

Couldnt have said it better myself. This is the big problem with FI cars. See most people who track prefer NA cars because of the big problem due to heat. There is alot of FI cars but they usual are a big headache and can run in problems and lots of $$$$. Heat is the biggest enemy when it comes to an engine. It just becomes more prone to FI cars due to the enormus amounts of heat generated without humidity in the air. So add the normal operating heat from the FI car and now add extreme amount of humidity and heat that is in the air. Not a good combo. This is why extra amounts of cooling is a must on these cars if you plan on running them hard. Just my .02

Belarus · 07-07-2010, 10:55 AM

Quote:

Originally Posted by A2G

warmer/humid weather conditions? yesterday the car was very slow and revving it above 5k rpm was a miracle to pull off...anyone else have the same problem?

As everyone else stated performance drop is to be expected. However "revving it above 5k rpm was a miracle to pull off." that doesn't sound right....

Mike@N54Tuning.com · 07-07-2010, 02:54 PM

Meth will solve that problem

Mike

A2G · 07-07-2010, 04:11 PM

thanks for all the advice here...i know the car performance will drop when air conditions are hot and humid....but should it be to a point when I hard accelerate, it is the same as, pushing the gas pedal half way?....the car refuses to go any faster.

As some of you said this might be something that I need to check out with dealership...but i only have this problems during bad weather conditions and the dealership wont take a look without an appointment...ill have to time it right

anyone here have this problem as well? with or without jb3 or any other ecu tunes?

redline2 · 07-07-2010, 06:33 PM

I'm stock and no issues anywhere near what you describe. There is a noticeable performance difference for someone in tune with their car but the average driver probably wouldn't even notice it. Check your iDrive service menu for any fault codes and take it in regardless. If you have it chipped, then the sensor mappings done by whatever module you are using could actually be part of the problem. You should convert to stock if you can first and see if the issue remains.

samej · 07-07-2010, 09:52 PM

Check it again this week if you can - the temps are smoking until Friday in Central Canada. A turbo really shouldn't be affected by less dense air. Also check you oil temps. They shouldn't staying at the 6 o'clock position. Power loss like you're describing doesn't sound normal. You are using premium gas? (had to ask... LOL)

Belarus · 07-08-2010, 01:22 AM

Quote:

Originally Posted by Mike@N54Tuning.com

Meth will solve that problem

Mike

That's pretty irresponsible answer, hopefully it was sarcasm.

DnA Diesel · 07-08-2010, 06:44 AM

Quote:

Originally Posted by Belarus

That's pretty irresponsible answer, hopefully it was sarcasm.

You mean as indicated by the smilie?

Belarus · 07-08-2010, 07:29 AM

Quote:

Originally Posted by DnA Diesel

You mean as indicated by the smilie?

would of been better more appropriate...

Eclipse · 07-09-2010, 01:06 AM

Quote:

Originally Posted by Mike@N54Tuning.com

Meth will solve that problem

Mike

shhhh..not right now u ppoooki !! =D

07-06-2010, 06:19 PM	#1
A2G Hye 22 Rep 140 Posts Drives: 18 LBB M2 Join Date: May 2009 Location: Toronto iTrader: (0)	335 doesnt perform as well during.... warmer/humid weather conditions? yesterday the car was very slow and revving it above 5k rpm was a miracle to pull off...anyone else have the same problem? __________________
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07-06-2010, 07:13 PM	#2
335isGuy Captain 32 Rep 770 Posts Drives: 2018 Bmw 340xi Msport Join Date: Oct 2006 Location: Toronto iTrader: (0) Garage List 2018 Bmw 340xi Msport [0.00]	That sounds really bad, but thats Heat Soak for ya. That is a Turbo/SC cars enemy is heat. Bigger FMIC and Aquamist!
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07-06-2010, 07:17 PM	#3
redline2 Private 1 Rep 81 Posts Drives: 335is Join Date: May 2007 Location: Toronto iTrader: (0)	Generally speaking, hot moist air is bad, cold dry air is good. Air pressure also plays a role in normally aspirated cars as it impacts the air/fuel mixture. If you Google "Dyno correction factors" you will see formulas to calibrate for air density and atmospheric pressure. Forced air induction (your turbo 335xi) overcomes atmospheric pressure by forcing air into your engine by means of the exhaust driven turbocharger. Intercooler performance is also reduced since difficult to cool the turbocharger pressurized hot air when the ambient air is also also hot. All sorts of sensors inline to help achieve ideal air/fuel mixtures but you will indeed feel a difference. Your air conditioner blasting also doesn't help due to the parasitic load the compressor puts on the engine.
	Appreciate 0 Quote

07-06-2010, 08:51 PM	#4
dpwr Captain 36 Rep 852 Posts Drives: a good one Join Date: Oct 2008 Location: Toronto iTrader: (0)	it does loose some performance but nothing like "the car was very slow and revving it above 5k rpm was a miracle to pull off"... as above states heat is FI's enemy
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07-06-2010, 08:54 PM	#5
jasonintoronto Captain 33 Rep 703 Posts Drives: 2007 335i coupe (sold) Join Date: Mar 2008 Location: toronto iTrader: (0)	all turbo cars lose power due to heat soak, although the 335i is better prepped than others. not being able to rev above 5k? that's not normal. if you're exaggerating, ok. if not, take it to the dealer. __________________ 2007 Porsche Carrera 4 2007 BMW 335i Coupe (SOLD)
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07-06-2010, 09:58 PM	#6
OwnAge Gourik 187 Rep 4,302 Posts Drives: soon Join Date: Mar 2007 Location: Innisfil Ontario. iTrader: (1) Garage List 2009 328i [8.90]	No wonder my car felt slow when i have AC running full blast __________________
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07-06-2010, 10:39 PM	#7
JulieDriving Female driving enthusiast :P 76 Rep 2,308 Posts Drives: Bimmer Join Date: Nov 2009 Location: Ontario, Canada iTrader: (0) Garage List 2013 BMW M3 Coupe [10.00]	No wonder my car felt a little sluggish at first... Good to know, tks. __________________ 2013 M3 coupe (Azurite Black, Black, Piano Black) + miata nut (2 miatas) + Mk6 GTI 5-door hatch (our mini-SUV )
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07-06-2010, 10:55 PM	#8
Eclipse Private First Class 8 Rep 199 Posts Drives: AW 07 e92 335i Join Date: Feb 2008 Location: Vancouver iTrader: (1)	yea the car feels really sluggish wen its really hot out...
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07-07-2010, 02:22 AM	#9
DimSum Banned 202 Rep 2,740 Posts Drives: SLOW Join Date: May 2008 Location: LITTLEBIMMER.COM iTrader: (10)	heatsoak for all the BMW engines... Even for the N52.
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07-07-2010, 08:05 AM	#11
samej First Lieutenant 24 Rep 345 Posts Drives: 2017 F22 M240i xDrive MG Join Date: Jun 2009 Location: Ottawa iTrader: (0)	Not normal unless were you in heavy traffic? I had a run to and from the airport this week and my oil temps were fine (temps were 34-35C).
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07-07-2010, 08:33 AM	#12
2kaccordocoupe Brigadier General 1274 Rep 4,703 Posts Drives: Former ///M Driver Join Date: Nov 2008 Location: The 6ix iTrader: (2)	high ambient air temps + high humidity = less dense air your car cannot dissipate the heat nor can it utilize dense air for combustion resulting in sub par performance simple grade school physics
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07-07-2010, 02:54 PM	#15
Mike@N54Tuning.com Joint Chiefs of Staff 4919 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Meth will solve that problem Mike
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07-07-2010, 04:11 PM	#16
A2G Hye 22 Rep 140 Posts Drives: 18 LBB M2 Join Date: May 2009 Location: Toronto iTrader: (0)	thanks for all the advice here...i know the car performance will drop when air conditions are hot and humid....but should it be to a point when I hard accelerate, it is the same as, pushing the gas pedal half way?....the car refuses to go any faster. As some of you said this might be something that I need to check out with dealership...but i only have this problems during bad weather conditions and the dealership wont take a look without an appointment...ill have to time it right anyone here have this problem as well? with or without jb3 or any other ecu tunes? __________________
	Appreciate 0 Quote

07-07-2010, 06:33 PM	#17
redline2 Private 1 Rep 81 Posts Drives: 335is Join Date: May 2007 Location: Toronto iTrader: (0)	I'm stock and no issues anywhere near what you describe. There is a noticeable performance difference for someone in tune with their car but the average driver probably wouldn't even notice it. Check your iDrive service menu for any fault codes and take it in regardless. If you have it chipped, then the sensor mappings done by whatever module you are using could actually be part of the problem. You should convert to stock if you can first and see if the issue remains.
	Appreciate 0 Quote

07-07-2010, 09:52 PM	#18
samej First Lieutenant 24 Rep 345 Posts Drives: 2017 F22 M240i xDrive MG Join Date: Jun 2009 Location: Ottawa iTrader: (0)	Check it again this week if you can - the temps are smoking until Friday in Central Canada. A turbo really shouldn't be affected by less dense air. Also check you oil temps. They shouldn't staying at the 6 o'clock position. Power loss like you're describing doesn't sound normal. You are using premium gas? (had to ask... LOL)
	Appreciate 0 Quote