Originally Posted by
LewisB
Hi All,
Hopefully somebody is able to help me!
Been doing some WOT pulls and taking some logs recently. I seem to have broken a ringland today (cylinder 1), I was logging at the same time.
Requested lambda at WOT is 0.8 (usually!). Did some pulls, no issues, bit of timing retard due to knock (fuel quality in Qatar is pretty poor at times). The next pull I did, all is the same however requested lambda is 1, so with boost pressure at 16 psi its nowhere near ideal. The ringland looks to have cracked at around 4500rpm.
Anybody have any idea why the requested lambda was 1 even though it should be 0.8?
I've attached my tune - hopefully somebody can have a look and see if there's anything obvious.
Car is a 2015 challenger hellcat
FI Interchiller
2.85 pulley
ID1050s
BAP
All other normal supporting mods.
Stock block, although soon to be forged pistons - don't want this happening again!
I've added the log where the failure happened (second log) - failure was obvious when there was a loud noise from the engine and it started misfiring after that - that was at 6.22 on the timeline.
First log added just for comparison. Intake temps high for all of it (charger coolant stopped working due to reported low level). Should have noticed and not done a WOT pull! Done now. But for future, anyone know why the requested lambda was 1 instead of 0.8 on that last pull? Im guessing that if the fuelling was right, my engine would still be fine.
Thanks
Lewis