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deemarr 335i deemarr 335i is offline
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Default Car showing boost at idle 3.2psi - 07-11-2018, 09:41 AM

Having a issue with my car showing boost at idle which of course throws a 25C8 code....do you think its mechanical wastegate issue or eletrical issue with jb4 harness...car is a 2011 e90 n55 pure stage 2 and fbo jb4 with mhd backend flash? I have logs to confirm also, I'll post when I leave work. Thanks guys......also when I do drive and get the car to build over 5 to 6 psi sometimes boost will go back to 0 at idle, until I build boost again and sometimes it will stay at 3psi at idle again. Sorry for the long post.

Last edited by deemarr 335i; 07-11-2018 at 03:33 PM..
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tho's Avatar
tho tho is offline
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Default 07-11-2018, 09:49 AM

Quote:
Originally Posted by deemarr 335i
Having a issue with my car showing boost at idle which of course throws a 25C8 code....do you think its mechanical Watergate issue or eletrical issue with jb4 harness...car is a 2011 e90 n55 pure stage 2 and fbo jb4 with mhd backend flash? I have logs to confirm also, I'll post when I leave work. Thanks guys......also when I do drive and get the car to build over 5 to 6 psi sometimes boost will go back to 0 at idle, until I build boost again and sometimes it will stay at 3psi at idle again. Sorry for the long post.
I'd double check your connections at the TMAP sensor. Are you running a stock or upgraded sensor?

In settings, Under User Adjustment, what is your N20 TMAP set to?


2011 335i - JB4 ISO | MHD E85 PI BEF | Exhaust Mods | CP | 5" stepped FMIC | BMS Meth Injection | BMS Intake | Pure Stage 2 | Pure Inlet | FF wires | Fuel It Stage 2 | DV+ | N20 TMAP | Ethanol mix
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deemarr 335i deemarr 335i is offline
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Default 07-11-2018, 10:55 AM

Quote:
Originally Posted by tho
I'd double check your connections at the TMAP sensor. Are you running a stock or upgraded sensor?

In settings, Under User Adjustment, what is your N20 TMAP set to?
Running a N20 tmap and it's set at 1 on jb4 app

2C58 BOOS PRESSURE CONTROL, DESACTIVATION, BOOSR PRESSURE BUILD UP BLOCKED
2C71 BOOST PRESSURE SENSOR, PRESSURE TOO HIGH
2C83 BOOST PRESSURE SENSOR, PLAUSIBILITY, PRESSURE BEFORE THROTTLE VALVE TOO HIGH

I get those codes except the 2c71 code
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Terry @ BMS's Avatar
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Default 07-11-2018, 10:56 AM

Sounds like a faulty sensor.


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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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dross50 dross50 is offline
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Default 07-11-2018, 11:57 AM

Quote:
Originally Posted by Terry @ BMS
Sounds like a faulty sensor.
That's exactly what mine did when I had a faulty sensor. Bought a new one and issue magically disappeared.


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deemarr 335i deemarr 335i is offline
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Default 07-11-2018, 03:30 PM

I put the stock 2.5 bar tmap back and so far so good, gonna drive for a week to verify and order a new 3.5bar....thank guys much appreciated ����
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///Monst3r ///Monst3r is offline
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Default 07-17-2018, 10:28 AM

Im having the same issue even after replacing with another 3.5 tmap. Could it be the tmap on the manifold side?


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Payam @ BMS's Avatar
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Default 07-18-2018, 09:40 AM

Quote:
Originally Posted by ///Monst3r
Im having the same issue even after replacing with another 3.5 tmap. Could it be the tmap on the manifold side?
Doubt it, what settings do you have for the 3.5 bar. Are you using mhd or Jb4 for the calibration?


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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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