JB4tech.com - International Turbo Tuning Discussion
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rowdytn rowdytn is offline
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Car: 2019 GLC63 AMG
Default 2019 GLC63 - Ready to try more aggressive maps - 02-18-2022, 02:38 PM

(I posted this in the support and logs group, but realized I probably should have posted here)

For the past year plus, I've been running 93 Octane on Map 2 in my 2019 GLC63 every day. I've never thrown a code, and love how it runs. When I first installed the JB4, I read about issues running ethanol mixes and decided Map 2 was enough and I'd never need ethanol. However, for the past week or so, I've been really getting the itch to try some more aggressive maps.

Can anyone provide me with some suggestions about what mixes and maps to try first? I know George has said some cars handle the mixes better than others. I'd like to see what mine can do, preferably without blowing anything up. My hope is to ease into things, and then add more ethanol to the mix/change maps as the car shows it can tolerate it.

Thank you!
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 02-20-2022, 09:50 AM

Just start with a few gallons of E85, maybe 3-4, and see how the car tolerates it. Fuel pressure is usually the problem with E85 use in these.


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rowdytn rowdytn is offline
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Default 02-20-2022, 08:11 PM

Thanks, Terry! Would you suggest I run with Map 3 for awhile and then see how it does or if I see any CELs?
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Terry @ BMS's Avatar
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Default 02-20-2022, 08:26 PM

I'd start with map2 on an E20 mix and see if the fuel pump can handle it. If so then map3 may work.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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