What is the ideal outside temperature for our engines to run at?

Berduderunner · 07-16-2009, 10:10 PM

I've searched all over but cant find any info on this.

My 1/4 times have dropped from 12.7 (with JB3 1.22) to 13.3 (JB3 1.3).

The temp and humidity were much higher for my more recent runs. Would this be the contributing factor? And what is the ideal outside temp? Around 60 degrees maybe?

THANKS!

sbefar01 · 07-17-2009, 12:31 AM

Don't listen to me, but i was thinking around 40-45 deg with low humidity.

x5mad · 07-17-2009, 02:49 AM

Quote:

Originally Posted by Berduderunner

I've searched all over but cant find any info on this.

My 1/4 times have dropped from 12.7 (with JB3 1.22) to 13.3 (JB3 1.3).

The temp and humidity were much higher for my more recent runs. Would this be the contributing factor? And what is the ideal outside temp? Around 60 degrees maybe?

THANKS!

Yeah, our engines tend to better with lower temperatures and less humidity. As to the optimum temperature, we need more data from around the world but even then there are so many variables that it would be very difficult to define an optimum temperature.

Lionel Hutz · 07-17-2009, 09:45 AM

Quote:

Originally Posted by Berduderunner

I've searched all over but cant find any info on this.

My 1/4 times have dropped from 12.7 (with JB3 1.22) to 13.3 (JB3 1.3).

The temp and humidity were much higher for my more recent runs. Would this be the contributing factor? And what is the ideal outside temp? Around 60 degrees maybe?

THANKS!

It's the nature of turbocharged engines to love cold ambient temps. The colder the better, so long as the fluids can get warm enough to lubricate properly and the tires can grip. I've always driven turbo'd cars up here in Denver and the first cold day of the year feels like

fshowcars · 07-17-2009, 11:48 AM

Quote:

Originally Posted by Berduderunner

I've searched all over but cant find any info on this.

My 1/4 times have dropped from 12.7 (with JB3 1.22) to 13.3 (JB3 1.3).

The temp and humidity were much higher for my more recent runs. Would this be the contributing factor? And what is the ideal outside temp? Around 60 degrees maybe?

THANKS!

Hey man, that sucks to hear about the times, but given the change in temps it might be the cause. What map are you running on the 1.3? I swear that my 1.22 ecu ripped harder than the new flash, but then after running map 5 for a week i changed to map 4 two days ago, and after a day of adaptation, i swear the car likes map 4 a lot better... being that 5 is 4 with lagfix, and i never experienced lag, it might make sense.

anyway, i'll be going to the track next weekend and will see how it performs. Car is bone stock other than the JB3. I will note the temp and altitude at the time of the runs.

Berduderunner · 07-20-2009, 04:48 AM

Thanks for the info guys, all sounds about right.

Luvmybmw · 07-30-2009, 07:18 AM

Yeah, I agree with all of the comments that our engine(s) run much better in cool air with low humidity. I ran a 12.85 when it was nice and cool and my best time the other night when it was 86 F and high humidity was 13.15. I would say temps in the low 60s would be a good thing...Just my thoughts

The Cthulhu · 07-30-2009, 08:32 AM

All engines like cold and dry air. The colder the air, the denser. After changing your oil viscosity, your engine would probably love Antarctica, if your block didn't crack from the delT and your radiator didn't freeze. Tires are a different story.

Berduderunner · 07-30-2009, 10:16 PM

Quote:

Originally Posted by The Cthulhu

All engines like cold and dry air. The colder the air, the denser. After changing your oil viscosity, your engine would probably love Antarctica, if your block didn't crack from the delT and your radiator didn't freeze. Tires are a different story.

do you think turbos are affected even more by temp. change than an N.A.?

akak1997 · 07-30-2009, 10:56 PM

Quote:

Originally Posted by The Cthulhu

All engines like cold and dry air. The colder the air, the denser. After changing your oil viscosity, your engine would probably love Antarctica, if your block didn't crack from the delT and your radiator didn't freeze. Tires are a different story.

you've forgot about fuel, if the fuel couldn't atomize properly, your HP will suffer.

Turbo cars gain more power when the temp is cooler, more so than NA cars.

ben14142001 · 07-30-2009, 11:54 PM

It's pretty much the only good thing about winter. That and drunken snow days.

The Cthulhu · 07-31-2009, 10:31 AM

I'd wager that turbocharged cars are more subject to temperature-based horsepower variation because of the extra compression stage before the cylinder.

That could be a bad thing because it could allow more stress on internals. More horsepower isn't always a good thing, or I'd be running compressed medical oxygen to my turbo intakes, and LN2 cooling my engine block.

It would stay nice and cold and powerful as the internals shredded themselves over the course of the next week.

Wait, isn't that what people do to honda civics? NOS! TURBOZ!! VTAK!!!

imported_mega · 07-31-2009, 11:19 AM

Quote:

Originally Posted by The Cthulhu

Wait, isn't that what people do to honda civics? NOS! TURBOZ!! VTAK!!!

have you not read the posts in this forum? Or n54tech ?

07-16-2009, 10:10 PM	#1
Berduderunner drk one 38 Rep 797 Posts Drives: 2008 135i Join Date: Dec 2007 Location: Tampa/Orlando iTrader: (0) Garage List 2008 e90 335i [0.00] 2008 135i [0.00]	What is the ideal outside temperature for our engines to run at? I've searched all over but cant find any info on this. My 1/4 times have dropped from 12.7 (with JB3 1.22) to 13.3 (JB3 1.3). The temp and humidity were much higher for my more recent runs. Would this be the contributing factor? And what is the ideal outside temp? Around 60 degrees maybe? THANKS! __________________ Jet Black \| Coral \| HighGlossBlack \| Steptronic \| Premium \| Sport \| Comfort \| ActiveSteering \| Navi \| HiFi \| HD \| iPod \| SAT BMS JB3 v2.0 \| BMS DCI \| Berk Tech Sport Exhaust \| UR * DPs \| CoolingMist Meth Kit w/ CMGS \| H&R OE Sport Springs \| Breyton GTS-R \| Dunlop Direzza Sport Z1 Star Specs \| GP Thunder 8000K Low Beams/Angel Eyes/Cornering Lights \| LED Interior Light Kit \| Window Tint \| Smoked Tail Lights \| Smoked License Plate Cover
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07-17-2009, 12:31 AM	#2
sbefar01 First Lieutenant 16 Rep 331 Posts Drives: 1er Join Date: Nov 2007 Location: NJ iTrader: (0)	Don't listen to me, but i was thinking around 40-45 deg with low humidity.
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07-20-2009, 04:48 AM	#6
Berduderunner drk one 38 Rep 797 Posts Drives: 2008 135i Join Date: Dec 2007 Location: Tampa/Orlando iTrader: (0) Garage List 2008 e90 335i [0.00] 2008 135i [0.00]	Thanks for the info guys, all sounds about right. __________________ Jet Black \| Coral \| HighGlossBlack \| Steptronic \| Premium \| Sport \| Comfort \| ActiveSteering \| Navi \| HiFi \| HD \| iPod \| SAT BMS JB3 v2.0 \| BMS DCI \| Berk Tech Sport Exhaust \| UR * DPs \| CoolingMist Meth Kit w/ CMGS \| H&R OE Sport Springs \| Breyton GTS-R \| Dunlop Direzza Sport Z1 Star Specs \| GP Thunder 8000K Low Beams/Angel Eyes/Cornering Lights \| LED Interior Light Kit \| Window Tint \| Smoked Tail Lights \| Smoked License Plate Cover
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07-30-2009, 07:18 AM	#7
Luvmybmw One Fast 1 53 Rep 747 Posts Drives: '08 AW e82 Join Date: Sep 2007 Location: Indiana iTrader: (2)	Yeah, I agree with all of the comments that our engine(s) run much better in cool air with low humidity. I ran a 12.85 when it was nice and cool and my best time the other night when it was 86 F and high humidity was 13.15. I would say temps in the low 60s would be a good thing...Just my thoughts __________________
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07-30-2009, 08:32 AM	#8
The Cthulhu Banned 7 Rep 197 Posts Drives: N/A Join Date: Jun 2009 Location: N/A iTrader: (0)	All engines like cold and dry air. The colder the air, the denser. After changing your oil viscosity, your engine would probably love Antarctica, if your block didn't crack from the delT and your radiator didn't freeze. Tires are a different story.
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07-30-2009, 11:54 PM	#11
ben14142001 Captain 27 Rep 707 Posts Drives: 2018 M3 ZCP Join Date: Aug 2008 Location: Nashville iTrader: (1)	It's pretty much the only good thing about winter. That and drunken snow days.
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07-31-2009, 10:31 AM	#12
The Cthulhu Banned 7 Rep 197 Posts Drives: N/A Join Date: Jun 2009 Location: N/A iTrader: (0)	I'd wager that turbocharged cars are more subject to temperature-based horsepower variation because of the extra compression stage before the cylinder. That could be a bad thing because it could allow more stress on internals. More horsepower isn't always a good thing, or I'd be running compressed medical oxygen to my turbo intakes, and LN2 cooling my engine block. It would stay nice and cold and powerful as the internals shredded themselves over the course of the next week. Wait, isn't that what people do to honda civics? NOS! TURBOZ!! VTAK!!!
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