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Discussion Starter · #1 · (Edited)
Hello. I have modified the 25 pin APC boost box to adjust boost .5-1.5 bar for my RWD 240 and 740 Volvos. The SAAB boost controller can be used as a stand alone boost box. I have 2 versions. One is a 7524127 and the other is 7524150 . The modification is for all 25 pin APC boxes. These are easily found on ebay for cheap.



Remove resistors R42 and R138



Replace R42 with a solid jumper and R138 with a 40kohm resistor. The one I used was actually 39kohm.



Thats it you can use it in the normal way from here, but for the daring the next step I propose is to change the 1kohm and 50kohm trim pots to digital pots so we can change the boost and rise setting thru a retentive memory MCU controlled remote terminal or push buttons.


Regards,
Hubert
 

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Discussion Starter · #3 ·

Here are the modified boxes that will control boost from 7 to 22 pounds.
Regards,
Hubert
 
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