1.8 bar WG ...etc.

["Scott Mo." <scottmo@teleport.com>]

Marty,

There may be one other problem that has been overlooked.....

If I remember correctly, you are now running the later '91 200 Turbo 10V
MC dual knock sensor engine with higher compression (8:4 to 1)in your 87
5000TQ.

Are you using the original MAC11 035-905-383T ECU designed for the
single knock sensor MC engine with 7:8 to 1 compression or did you
install the MAC14 ECU from the Dual knock sensor donor car? The Mac14
ECU installation would have required some wiring changes.

The stock timing map values in the MAC11 are going to be more advanced
in the 1000-3500 RPM range than the stock timing values normally used
for the higher compression MC dual knock sensor engine with the MAC14
ECU. You may be getting knock (whether or not you can hear it) which is
retarding the timing and hurting the performance. This problem will only
get worse if you are cranking up the boost.

Here are the stock Mac11 timing values (BTDC in degrees) 
used at 1.5bar or greater boost. 

The first value shown (22 degrees BTDC) 
is for ~1000RPM, the last value for ~6500 RPM.
1.5bar	
22	24	24	24	24	25	25	23
23	22	23	24	25	31	30	30

Here are the Mac14 timing BTDC degrees used from ~1000-6500RPM.

1.5bar
19	21	21	21	21	21	22	21	
21	22	23	25	25	27	29	31

If you are using the MAC11 ECU, you will most likely need to adjust the
timing map values used in the QlCC chip. The Timing values used in the
UK version of this engine (MB) with the MAC12 ECU may be a good starting
point as this engine has 8:6 to 1 compression and utilizes the single
knock sensor setup and similar ECU system to the MC.

HTH
-- 
Scott Mo.
1989 200TQ
1988 5000TQ
1966 VW Beetle
http://www.teleport.com/~scottmo