Put about a thousand miles on it since the rebuild. Runs really nicely - so much more power on tap when cruising. Around 3500 in 5th, I just have to ease on the gas & it takes off like a rocket
I believe the speedo is very optimistic, though. I really would like a 6 speed trans now, to drop the revs when cruising.
The 2.75" butterfly has made a significant difference to the responsiveness, it must have been choking with the 2.25" bore I had previously made. Can't imagine how bad it would be with the restriction of stock FI butterfly/intake bore.
EDIT: surging was all due to voltage drop to LH2.2 ignition coil
The idle surging issue I had after installing the EZK117 ignition, seems to have been caused by my neglecting to connect the TPS WOT ground wire to the EZK ECU (LH pin 12 to EZK pin 15). Both idle & WOT connections also go to the LH2.2 ECU, so I can only presume there is trace voltage present that tells the EZK to maintain a steady advance at idle, even though the idle side is grounded through the LH ECU. The design & function manuals don't go into that level of detail. I found a Saab pinout that describes a 5v signal being present on the WOT side of the TPS/ECU circuit, so that would have been absent as I had it wired.
I haven't been able to refine/alter the timing maps as I need an older (v5) Willem Programmer AND an PC desktop with a serial printer port in order to program the old chips used. Not sure it's worth the additional expense. The main problem is that the Volvo system cuts fuel/ign around 6300rpm, which is annoying if I'm winding it out in 1st/2nd, otherwise there's not really a need to rev that high in street use. I would like to alter the curve to compensate for the current need to run under 10º at idle (to limit total advance), that is negatively effecting my idling coolant temps.
Now that I have an oil temp gauge (autometer), I can see that my oil temps rarely exceed 180-200ºF - which means the oil cooler isn't doing much - the built in t/stat begins to open * 203ºF / fully open * 230ºF. Although I haven't driven it hard continuously/extended periods, so it may still be good insurance.