looking back at the last datalog video of the forged piston turbo setup back in june & august 2013 I can compare how she runs then and now.
2013 June 29th after bed-in
cold cranking: 17C with injectors spiking at 30ms, IAV at 75%, MAF at 0.90v, timing at 5deg
after cranking: begins rev at 900rpm, injectors at 10.3ms, IAV at 78%, MAF at 1.30v, timing at 23deg
few secs after crank: 1400rpm, injectors gradually dropping from 2.50ms as temp quickly builds, IAV at 73%, MAF at 1.36v, timing at 23deg
goes closed loop after 1:03s
warm idles: 80C, 860rpm, injectors 1.62ms, IAV 16%, MAF 0.96v, timing 6deg
2013 August 22nd leaner coldstart & hotter thermo
cold cranking: at 16C with injectors spiking at 18ms, IAV at 75%, MAF at 0.90v, timing at 5deg
after cranking: begins rev at 1200rpm, injectors at 5.4ms, IAV at 78%, MAF at 1.30v, timing at 23deg
few secs after crank: 1340rpm, injectors gradually dropping from 2.2ms as temp quickly builds, IAV at 65%, MAF at 1.30v, timing at 23deg
goes closed loop after 1:15s
warm idles: 92C, 850rpm, injectors 1.66ms, IAV 16%, MAF 0.96v, timing 6deg
2014 Feb 15th leaner coldstart
cold cranking: at 12C with injectors spiking at 14ms, IAV at 75%, MAF at 0.90v, timing at 5deg
after cranking: begins rev at 1200rpm, injectors at 4.7ms, IAV at 78%, MAF at 1.30v, timing at 24deg
few secs after crank: 1400rpm, injectors gradually dropping from 2.2ms as temp quickly builds, IAV at 73%, MAF at 1.33v, timing at 24deg
goes closed loop after 0:22s
warm idles: 92C, 850rpm, injectors 1.56ms, IAV 16%, MAF 0.92v, timing 8deg
This morning tried a leaner cold crank @0:00 but struggled to fire up.
richened the crank value slightly @ 0:30 but still slightly struggles.
so I reset the cranking enrichment all the way back to normal @0:55 and fires right up, so cold cranking really needs alot of fuel and nothing I can do bout the 9.0afr cold start.
tried running the same turbo map as back in 2013-09-22 and the rich overrun below 1700rpm still happens.
So I've learnt that by leaning out the injectors during cold cranking from 30ms to 14ms the AFR reaches closed loop abit faster.
and it seems the premature rich AFR from the injectors re-opening below 1700rpm have always happened so prob nothing I can do bout it