utec abc or hallman mbc
I just had my Hallman mbc removed to go with Utec and abc. Turbotrix warned me that I can get more consistent results with the mbc. I should have listened. I am getting the P0234 code (overboost problem) because the boost is spiking pretty bad now. It is set at 25 psi (with alcohol injection) but it's probably hitting 28-30 psi and tapering to 21. All for the convenience of having two programs w/o manually adjusting the mbc. I am thinking about getting the Turboxs dual mbc.
Originally Posted by RobS
I just had my Hallman mbc removed to go with Utec and abc. Turbotrix warned me that I can get more consistent results with the mbc. I should have listened. I am getting the P0234 code (overboost problem) because the boost is spiking pretty bad now. It is set at 25 psi (with alcohol injection) but it's probably hitting 28-30 psi and tapering to 21. All for the convenience of having two programs w/o manually adjusting the mbc. I am thinking about getting the Turboxs dual mbc.
You do have a MAP sensor right? I have been on the fence about ditching my Hallman for the the Utec bleed valve and MAP sensor. This is interesting info. Can't wait to hear what MJ has to say about it.
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Actually, the best way to work with the ABC is to use closed loop boost with the MAP sensor.. **HOWEVER** you can minimize spiking by using lower duty cycles in the area you get spikes and it won't happen.. if you blindly set duty cycles, you will get spiking.
an MBC does also have the same problem when downshifting or running through the gears when boost builds faster than the MBC can build line pressure to open the wastegate.
The trick is to make your boost maps start at 25-30% duty In open loop boost, then each load column column go up intil you hit your desired level.. and at peak torque (where peak boost would occur) your highest duty cycle would actually be LOWER than at higher rpm.. that will produce a rock steady boost curve with minimal spiking. However if you want the least possibility with spiking, closed loop boost control works best.
an MBC Is completely undesireable in the northeast since any given day your boost can be 2-5psi different thanks to air pressure and temp.. Anyone who tells you otherwise doesn't spend time driving their car with an MBC every day, or is trying to sell you something.
an MBC does also have the same problem when downshifting or running through the gears when boost builds faster than the MBC can build line pressure to open the wastegate.
The trick is to make your boost maps start at 25-30% duty In open loop boost, then each load column column go up intil you hit your desired level.. and at peak torque (where peak boost would occur) your highest duty cycle would actually be LOWER than at higher rpm.. that will produce a rock steady boost curve with minimal spiking. However if you want the least possibility with spiking, closed loop boost control works best.
an MBC Is completely undesireable in the northeast since any given day your boost can be 2-5psi different thanks to air pressure and temp.. Anyone who tells you otherwise doesn't spend time driving their car with an MBC every day, or is trying to sell you something.
Wait, wait, wait. So when I insatll my ABC I have to use the MAP sensor? No problem there it will be going in this coming weekend. And do I have to use the stock pill in the line for the ABC?
Its not required to run the map sensor at all.. Its just if you want to run closed loop boost, you need it.. Otherwise you can play with the duty cycles to get the boost curve you want.. HOWEVER when weather changes, so will your boost.
