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Default N20 320I Increase target boost - 03-15-2021, 12:51 PM

Hello, I am from Brazil and our BMW N20 Flex fuel has a compression ratio equal to the 328i 10:1, I would like to know how I can exceed the boost limit of 18 psi, we also have a mixture of ethanol and high octane gasoline available.

I attach a log of my map6.

JB4 EWG + Flex fuel + EWG Connector
Thanks!
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Default 03-16-2021, 09:59 AM

It looks to me like you're pretty close to target boost, have you tried increasing the boost target in map 6? Are you saying it won't let you set it above 18psi?



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Default 03-16-2021, 10:19 AM

I already tried to increase the FF and unfortunately it is no more than 18 psi, with the firmware version 13/5/5 I reached those values, after I upgraded to 13/6/5 I can't do it anymore.
I read somewhere that there is a +10 psi increase protection over the stock, that is, limiting it to 18 psi.
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Last edited by iarthur; 03-16-2021 at 10:31 AM..
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Default 03-16-2021, 02:01 PM

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Default 05-19-2015, 01:26 PM

On the 320i factory boost is around 8-9psi, and the JB4 has a hard limit of +10psi on any map, absolute, or additive. So you would use map 1 and its 20psi target to get up to 17-18psi. You can use map 7 to do the same thing on a 320i. It will never hit the 23psi map 7 target as you'll get to +10psi over stock long before you do. Just like why you never hit the old map 1 20psi target.
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Default 03-17-2021, 10:53 AM

Gotcha, I wasn't aware of that but with all the issues the N20 has, it makes sense. I don't have an option for you...sorry but that would have to come from Terry.



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Default 03-17-2021, 11:10 AM

Thank you Steve, I hope Terry @ BMS sees this topic and can help me with something.
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Default 03-21-2021, 10:37 AM

There is a 10psi over factory cap to prevent people from blowing their motors. I would not suggest bypassing it unless you're really good at evaluating your tuning, running meth, etc, etc. But if you want to, set 6cyl timing = 1.
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