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      10-24-2017, 03:18 PM   #1
Maina
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4.25 psi or higher boost BMS Stage 1

Has anyone on here increased the boost of the BMS Stage 1 in the x3 n55? Any problems that this might have caused? Currently I am running on 3.5 psi over stock + e30 mix and the sav drives well, but won't mind a little more torque running 4.25 psi (or more ) boost on e35 mix. I will only use 93 octane in the winter.
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      10-24-2017, 03:56 PM   #2
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Curious of this as well as I am hovering over the buy it now button for the BMS Stage 1. I also only have a 28i so not sure if it's worth even getting but I wouldn't mind the extra bit of Horsepower.
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      10-30-2017, 08:44 PM   #3
Maina
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Isn't anybody modifying their cars in this forum? I figured there would be at least ten people commenting by now its old platform after all.
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      10-31-2017, 06:34 AM   #4
ina93
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If you’re looking for some more power why not consider getting an ECU flash? It’ll probably be noticeably stronger than the BMS piggyback.
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      11-01-2017, 09:50 PM   #5
Maina
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Quote:
Originally Posted by ina93 View Post
If you’re looking for some more power why not consider getting an ECU flash? It’ll probably be noticeably stronger than the BMS piggyback.
Why would an ECU flash be stronger then a piggyback? It all comes down to how much the boost is raised one way or another, no? The n54 I know for a fact has similar power gains by Cobb and JB4 on certain maps.
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      11-09-2017, 08:30 PM   #6
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Quick update on the tread, I saw that there has been some interest. After a thorough search trough the forums and contacting BMS directly, I have came to the conclusion that I shot myself in the leg. The new version of the BMS Stage 1 is not adjustable for higher boost even with the extra cable and it is unsafe doing so on the Stage 1 anyway. If you want more boost than the 12.5 psi with Stage 1 only option is going to JB4. They are compatible with the x3, only some function won't work that is why JB4 is not advertised for the x3. I really waned to mix e85 with 93 for extra power, but that is only effective with JB4. Doing it on Stage 1 does not deliver any additional power over 93 gas and the gas mileage gets really poor.
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