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bensk987 bensk987 is offline
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Default Boost going over Boost Failsafe on Map 5 - 05-16-2021, 03:24 AM

Hi

I am in the process of installing FMIC, Chargepipe and ********. I already have cooler plugs and new eldor coils but something is going on with fuel. I keep getting 11A002 Fuel pressure below target when on map 5. But.... I am assuming I am getting this because Boost is going over 25? I have my Boost Safe setting at 20 so I am not sure why I am reaching values of 25?

The attached is not a WOT just general driving but I am getting a bit worried about boost exceeding boost failsafe of 20 PSI.

I have the 3.5 Bar TMAP sensor

F10 N55 535i

Any ideas of why boost is exceeding failsafe and is in excess of 25 something I should be worried about? I am guessing yes..

Thanks

Ben
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Default 05-17-2021, 10:42 AM

You're overboosting and running lean so you get kicked to map 4. My guess is that you have a hardware issue causing you to go to full boost. Stuck wastegate, wastegate hitting something... ???



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bensk987 bensk987 is offline
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Default 05-18-2021, 05:59 AM

Hi Steve

Thanks for your feedback. I thought boost failsafe was meant to stop boost going past the 20psi ceiling in my case? I am not getting errors with regards to wastegate (not sure if I am meant to) but after I install FMIC, DP and Charge pipe I will take it to a decent shop to give it the once over before running map 5 again.

Thanks

Ben


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Default 05-18-2021, 09:03 AM

If there's a hardware issue and the wastegate isn't modulating boost, there isn't much the JB4 can do. This will likely happen on every map, including map 0.



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435gc 435gc is offline
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Default 05-19-2021, 10:04 AM

Boost failsafe is the limit you set for the jb4 to kick you to the safety map. If you exceed the set value for more than a couple seconds, it will send you to map 4.
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Default 05-20-2021, 09:52 AM

Quote:
Originally Posted by 435gc
Boost failsafe is the limit you set for the jb4 to kick you to the safety map. If you exceed the set value for more than a couple seconds, it will send you to map 4.
You are correct IF the JB4/DME have control over boost. In this case it doesn't appear they do.



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