N54Tech.com - International Turbo Racing Discussion
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Default Problems after installing JB4 N54 - 12-05-2021, 09:09 PM

So I recently bought a JB4 Used, came out of a 800 hp N54 with no Bluetooth or Wire Adapter. After installing no issues, drove for 3 min, and car stalled while doing 30 mph, and 12 codes poped up. Wires are good, and install was correct. I had a costume tune with MHD, and after I removed it codes went away, and no more stalling, but car is now on limb mode on JB4 Map 0, and MHD Unistalled. Car is stock on flashing as of now, and is back to normal. Code I pulled up is Boost Pressure Sensor Overrun, and radiator blind. I try putting Map 5 with JB4 so it auto tunes, and car tries to stall, and rough idles, and check engine pops up.
Any ideas what I could do to fix it. I donít have an upgraded TMAP Sensor
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Cannon @ BMS Cannon @ BMS is offline
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Default 12-06-2021, 10:23 AM

Please upload a picture of your user adjustment settings


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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ram00sa ram00sa is offline
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Default 12-06-2021, 11:50 AM

Do you have n20 3.5 bar installed ?
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Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 12-06-2021, 12:58 PM

If the Jb4 came off a ST turbo- good chance the ST firmware is on the JB4 as well.

I would do the following- purchase the Bluetooth kit so you have a means of connecting / resetting the Jb4.

Set the JB4 to stock turbo / normal firmware settings.


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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Default 12-06-2021, 03:57 PM

So apparently I did a back end flash with my MHD, and problems went away, no codes now besides my water pump (not an OEM so Iím not worried), radiator blind, and cats (Iím ******* so Iím not worried). But now my issue is that my car is only hitting 1 psi of boost. I hear my turbos spooling, but I donít get any boost.
I did the BEF correctly, set it to MAP 0, 4/2 settings, but now this is my issue, and I got no codes for a boost leak or so. I checked my charge pipe, DV, vacuum lines. Anyone got any ideas what could it be?
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Default 12-06-2021, 04:02 PM

Is it pulling like it is only getting 1psi?
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Default 12-06-2021, 04:04 PM

Stock waste gates psi would be much more than. If it's pulling like normal. Is ecu psi and boost both just 1psi
Maybe the sensor is bad?

At least your getting reply. Burger hasn't reply to any of my post ever.
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Default 12-06-2021, 04:06 PM

Quote:
Originally Posted by E92 Dad
Is it pulling like it is only getting 1psi?
No, I was looking at my gauges while doing a pull testing the maps, and it was hardly only hitting 1 psi at full throttle.
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Default 12-06-2021, 04:26 PM

My other issue I had with the car is that the alternator has gone bad, voltage regulator is failing, could that cause a low voltage, and screw the whole system causing my turbo issues because of the low voltage it has?
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Cannon @ BMS Cannon @ BMS is offline
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Default 12-07-2021, 10:16 AM

100% could be causing the issues. Low voltage can cause many issues.


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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Default 12-08-2021, 02:37 AM

So, I took out the alternator to warranty it, and apparently my inlet was loose from the turbo, and I could literally pull it off with my hands with no force. Alternator is out, and tomorrow I’ll have the new one, most probably that was the issue, but I’ll keep you guys updated.
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