Power FC Ignition break up.
12-29-11, 12:35 AM
#1
Big Turbo on JackStands
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Ignition break up.
Have an FD with a T62, PFC, 850/1300 inj, walbro pump FMIC and other supporting mods. Well I've been trying to tune it richer for safety purposes and was getting ignition breakup any time the AFRs went under 11.4...I stopped being lazy and installed MSD box and FC leading coils with 10.5 plugs and it got way better but it doesn't let me get in the 10s 11.00 without some break up...if I take out fuel it gets better but I really wanted to stay away from 11.5s-11.7s... Any tips... My timing is really conservative and split is 15 across the board.
12-29-11, 10:51 AM
#5
Don't tune it richer, it is worse for your engine, keep it in the 11s. Your timing is conservative so then you are plenty safe with 11 - 11.5 afr. Richer is not better, it can build more carbon and cause more knock. No point in tuning for tens which will make it use more gas, loose power, more carbon and detonation, ignition break up, etc.
12-29-11, 11:58 AM
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12-29-11, 01:04 PM
#7
Wideband might be not reading correctly. Had a similar issue a couple years ago. Did an install and was trying to rough a tune in on the street before heading to the dyno. Wideband said something like 11.5:1 and I was getting bad breakup. Fitted my own wideband and with the same map it bottomed out at 10:1. Did some back-to-back testing with a 3rd wideband on the dyno to confirm that the one in the car was the odd man out. It read the same as the other two around stoichiometric, but read much lower numerically as the mixtures fattened.
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