Heat Soaked Restart Issues
For cammed N/A setups is there any general guidance on heat soaked restarts? The car starts great cold and hot (after an immediate shutdown). But once you let it sit for 30 min+ it takes a lot of cranking to get going (starter is fine and engine turns over strong). I have tried more/less air, fuel, spark and nothing really helps. So I guess I'd like to know what the target EQ ratio and spark timing is ideal...you know "general guidance".
My guess is I need to experiment with the OL Injector Temp Gain ([ECM] 12442). The problem though is that the lowest temp is 176*F (80*C) which is in the range of heat soaked, but also is going to impact cold starts.
I have put a fuel pressure gauge on the rail and noted that fuel pressure spikes to 85 PSI (586 kPa) after 10 minutes of sitting with hood closed, but by the 30 minute mark is was down to 54 PSI (372 kPa). I video'd the fuel pressure gauge during start up and as soon as the motor cranks pressure rockets directly to 70 PSI (482 kPa) immediately.