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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > JB4, Catless DP's, 91 oct, 4000ft elevation, which map?



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      11-05-2012, 03:50 PM   #1
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JB4, Catless DP's, 91 oct, 4000ft elevation, which map?

So I just installed catless downpipes over the weekend. I am running them with my JB4. I live in El Paso TX which is at 4000ft elevation and only has 91 octane fuel. So my question is, which map should I run? I was told that Map 5 (autotune) doesnt work good at my elevation, and Map 2 says it is for 93 octane. Should I stick to map 1? Any suggections? Thanks
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      11-05-2012, 04:39 PM   #2
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Start with map1, log and see how your car likes it then go from there
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      11-05-2012, 07:28 PM   #3
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Map 5 is not good when you constantly drive in different elevations, if your car never sees below 3K feet, you should be good on Map 5
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      11-05-2012, 10:53 PM   #4
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I would get 5 gallons of 100 octane and 11 gallons 91 and put it on map 2
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      11-06-2012, 12:14 AM   #5
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Quote:
Originally Posted by CHECKERED View Post
Map 5 is not good when you constantly drive in different elevations, if your car never sees below 3K feet, you should be good on Map 5
This post suggests different
http://www.e90post.com/forums/showthread.php?t=500597

Quote:
Originally Posted by bmw335idizzle View Post
I would get 5 gallons of 100 octane and 11 gallons 91 and put it on map 2
I don't have access to 100 octane around here. Especially on a daily basis.

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Originally Posted by marv85 View Post
Start with map1, log and see how your car likes it then go from there
So far the car feels good on map 1. I just ordered the USB cable so I can run some logs and make sure my jb4 is updated
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      11-06-2012, 12:32 AM   #6
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Map 5 will auto adjust. You may want to reset it if you come down the mountain or change fuel blends.
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      11-06-2012, 01:54 AM   #7
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Quote:
Originally Posted by bigbro6785 View Post
So I just installed catless downpipes over the weekend. I am running them with my JB4. I live in El Paso TX which is at 4000ft elevation and only has 91 octane fuel. So my question is, which map should I run? I was told that Map 5 (autotune) doesnt work good at my elevation, and Map 2 says it is for 93 octane. Should I stick to map 1? Any suggections? Thanks
I would do a datalog on map1 and map5, but let map5 adjust for a few days before logging. Send me the logs and we can see what works best for you.

Make sure to flash the latest firmware on your JB4 as well.

Mike
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      11-06-2012, 11:26 AM   #8
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
I would do a datalog on map1 and map5, but let map5 adjust for a few days before logging. Send me the logs and we can see what works best for you.

Make sure to flash the latest firmware on your JB4 as well.

Mike
I just ordered the cable for my jb4 so as soon as it gets here I will do that. Thanks
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