I was thinking about this a couple weeks ago when looking at the intake flow numbers in the FAQ sticky thread. Our stock manifold has more than twice the differential flow of any other one there (except for Downs, but that doesn't count).
With that big of a difference, it seems to me that since the injectors are not individually controlled, the outside cylinders would run richer than the inside ones. That would be assuming the outside runners are starved for air and the the inside ones taking most of the air which I think is the case. Since the O2's try to adjust the AFR per bank in CL, its pretty much only reading the average of 4 cylinders. Each cylinder can vary alot and the EEC doesn't know it, thus causing the lean cylinders to ping.
I'm thinking of turning off my tweecer for a few weeks before putting on the new heads and intake. I'll try comparing the cylinders after taking the stock heads off to see if there is any noticable difference between the cylinders and maybe a pattern to confirm this.
Granted, our stock tune isn't the best, it still takes more to tune it out than I think it should. I had to get it to run really rich before it permanently stopped pinging. All the tunup stuff in the world wouldn't completely fix it.
Does this seem reasonable? What do you guys think?
I also never hear people with aftermarket intakes manifolds reporting pinging problems. I could be wrong, but it was an idea.
With that big of a difference, it seems to me that since the injectors are not individually controlled, the outside cylinders would run richer than the inside ones. That would be assuming the outside runners are starved for air and the the inside ones taking most of the air which I think is the case. Since the O2's try to adjust the AFR per bank in CL, its pretty much only reading the average of 4 cylinders. Each cylinder can vary alot and the EEC doesn't know it, thus causing the lean cylinders to ping.
I'm thinking of turning off my tweecer for a few weeks before putting on the new heads and intake. I'll try comparing the cylinders after taking the stock heads off to see if there is any noticable difference between the cylinders and maybe a pattern to confirm this.
Granted, our stock tune isn't the best, it still takes more to tune it out than I think it should. I had to get it to run really rich before it permanently stopped pinging. All the tunup stuff in the world wouldn't completely fix it.
Does this seem reasonable? What do you guys think?
I also never hear people with aftermarket intakes manifolds reporting pinging problems. I could be wrong, but it was an idea.
