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After getting my injectors sorted, I've now been retuning my map in earnest. I've upped the boost to 1.3bar and after dialing out knock with a bit more fueling and retarding the timing 1 degree in the upper reaches of the (power fc) map, I started to get an interesting/annoying/cause for concern effect as my on-road tuning session went on. At WOT, at 7000rpm on up, I'd start to hear backfiring noises (little pops) from my tailpipe, and the car didn't seem to pull as hard (but was still going). Knock sensors didn't indicate anything over 23.
The only thing I can think of is, am I somehow blowing out the spark, sending an unburnt fuel charge down the exhaust pipe? Or is it something else? Backfiring when letting off the throttle I've gotten (hope to get??), that's normal and if we're lucky we get a nice pop and a meter-long shot of flame, but getting rapidfire little pops at WOT high in the rpm range...what is that??
The only thing I can think of is, am I somehow blowing out the spark, sending an unburnt fuel charge down the exhaust pipe? Or is it something else? Backfiring when letting off the throttle I've gotten (hope to get??), that's normal and if we're lucky we get a nice pop and a meter-long shot of flame, but getting rapidfire little pops at WOT high in the rpm range...what is that??