BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > 120i F20 B48 JB4 Map w/o DP any risk?
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      12-04-2017, 04:37 PM   #1
mieluise
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120i F20 B48 JB4 Map w/o DP any risk?

Hi guys,

I'm new here and reading through some posts I see there's a lot of info on the previous engine but not too much on the new one, at least on what I'm interested in now: can I run JB4 Map 2 without downpipe safely?

I did run for a few days with Map 2 and compared with Map 1 and stock is like heaven and hell, it feels so much more powerful but I read before that in order to use (or at least take advantage of) Map 2 you must at least have an aftermarket downpipe installed which I do not have yet. I really like how my car feels on Map 2 but if there's any risk I won't do it until I get a DP.

So, is there any risk running on Map 2 without a downpipe?

Thanks guys, I hope you can help me and I can help you back in anything I can
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      12-05-2017, 08:33 AM   #2
harkes
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Stay on map1 - would be a shame to damage the cat due to impatience
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      12-06-2017, 10:58 AM   #3
mieluise
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Quote:
Originally Posted by harkes View Post
Stay on map1 - would be a shame to damage the cat due to impatience
Thank you harkes, I will, although I may run Map 2 once in a while just to calm down my interior child :P just for a few moments, not pushing it too hard XD

Cat would be the only thing that may get damaged? What else can I modify on my beloved 120i B48?
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      06-19-2019, 04:17 AM   #4
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Thanks mieluise for sharing the information on 120i jb4. I have a 120i as well and like to try JB4 or bms on it.

I don't think it's going to make any damage to your car because I don't see JB4 provides a list which what kind/which brand of intake or downpipe should be use for map2. or even the standard of air flow.

Why they suggested I think it's may because of various gas condition around the world and better intake and downpipe will definitely help the ecu to increase the psi easier
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