Re: How safe is above normal boost?

[rdh@sli.com (Robert D. Houk)]

   This is the key question.  Some people believe that the stock Audi ECU
   correctly performs its control functions (mixture, timing, etc.) up to 2.0
   bar.  Others are skeptical, indicating that you have to modify the brain
   box appropriately.  Being optimistic, I took the liberal approach, and
   ...

The stock MAC-02 ECU ('83/... UrQs) reads to about 16PSI before it
overflows its one-byte value A/D-converted absolute pressure reading.

Manifold pressure numbers (mapped to byte value):

  0x30  7	InHg
  0x40  4	InHg
  0x48	1 - 1.5 InHg
  0x50	0 - 1   InHg

  0x60	1.00	PSI
  0x68	1.75	PSI
  0x70	2.75	PSI
  0x80	4.00	PSI
  0x90	7.25	PSI
  0xB0	8.75	PSI
  0xB8	9.25	PSI
  0xC0	10.00	PSI
  0xC8	10.75	PSI
  0xD0	11.75	PSI
  0xD8	12.50	PSI
  0xE0	13.25	PSI
  0xE8	14.00	PSI
  0xF0	14.75	PSI
  0xF4	15.00	PSI
  0xF8	15.25	PSI
  0xFC	~16.00	PSI
  0xFE	16.00	PSI

Numbers are probably within about .5 PSI or about 1 InHg.

Sample of 1 ECU...

					-RDH