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BMW M5 F90 (2018+) General Forums Engine, Exhaust, Drivetrain, Tuning Modifications    Working with warm weather...

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      02-15-2020, 03:31 PM   #1
gpdriver17
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Working with warm weather...

I had been easily hitting 0-60 in 2.6-2.7 and running 10.1-10.2 1/4 mile times consistently, with 30-40 degree weather. Today it's about 70 out, and my 0-60 went up to 3.2. I tried 5+ times because I couldn't believe it. All were 3.15-3.25. Didn't have room to do any 60-130 pulls or 1/4 mile. I ran a 10.2 1/4 mile yesterday morning though with 0-60 in 2.8, so it has to be the weather.

It really sucks knowing a 30 degree temperature difference slows the car down that much. When it's 100+ out in the summer I'm going to be pushing 4 seconds 0-60 at this rate.

I already have meth. What else can we do to compensate for the warmer weather? Just throw more boost at it? It seems like that might be safe to do for the engine. I know it' puts more stress on the turbos, but if they go I'll upgrade. Not a big deal.
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      02-15-2020, 03:38 PM   #2
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This may be why I'm so slow

Now you understand my angst
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      02-15-2020, 03:45 PM   #3
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Quote:
Originally Posted by JBA87 View Post
This may be why I'm so slow

Now you understand my angst
Maybe. I have meth and E30 fuel on map 2 and you're still 2.5 tenths ahead of me though.
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      02-15-2020, 06:36 PM   #4
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Update:

It seems like the car adapted to the weather? If that's a thing. Went out and ran it hard again to get longer logs. 0-60 was 2.75, 10.4 1/4 mile. Still was .2 off my best Map 2 1/4 mile, but the DA is 3000 ft higher, full tank of gas, shitty road and the run had positive 1% slope.
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      02-15-2020, 06:43 PM   #5
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I was hoping it was the weather
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      02-15-2020, 07:03 PM   #6
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Quote:
Originally Posted by gpdriver17 View Post
Update:

It seems like the car adapted to the weather? If that's a thing. Went out and ran it hard again to get longer logs. 0-60 was 2.75, 10.4 1/4 mile. Still was .2 off my best Map 2 1/4 mile, but the DA is 3000 ft higher, full tank of gas, shitty road and the run had positive 1% slope.
These new DME's are Torque/Airflow modeled with BP correction, so they will adapt to weather conditions to approach their target. You will still lose performance as the air heats and the DA increases since additional airflow through increased boost levels will only approach and not equal the Mass Air Flow of extremely low DA. Plus the hotter air will limit the amount of timing pump gas can maintain vs cold air.

0.2 isn't bad at all considering.
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      02-15-2020, 07:20 PM   #7
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Deleted.
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Last edited by gpdriver17; 02-15-2020 at 07:26 PM..
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      02-15-2020, 07:22 PM   #8
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That makes sense. The timing was really good actually. It normally pulls up to about 20, but not over. Today, after adjusting it was pulling over 20.

Edit: This android app sucks. Never uploads pictures and always double quotes everything...
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      02-15-2020, 08:00 PM   #9
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What fuel are you running just out of curiosity
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      02-15-2020, 09:11 PM   #10
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Quote:
Originally Posted by gpdriver17 View Post
That makes sense. The timing was really good actually. It normally pulls up to about 20, but not over. Today, after adjusting it was pulling over 20.

Edit: This android app sucks. Never uploads pictures and always double quotes everything...
The timing increase is the DME targeting the Torque Model along with psi. But 70F is still very cool. At 95F it can target 20-25 degrees, but the knock sensors will pull it back....and that cuts power.
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      02-15-2020, 09:49 PM   #11
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Quote:
Originally Posted by JBA87 View Post
What fuel are you running just out of curiosity
Quote:
Originally Posted by JBA87 View Post
What fuel are you running just out of curiosity
13 gallons of 91, 7 gallons of E85 and meth injection.
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      02-08-2021, 09:38 AM   #12
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Colder air is better to compression. More oxygen
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