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That's about right for the entire bank. 2.2 for each cylinder is quite normal. What you want to watch is the BLM counts. 128 is a perfect BLM. Numbers higher is adding fuel and lower is taking it away. Again, high blm is lean and below 128 is rich. Lt1's drive me crazy because the banks are always different and there's only one fuel map for the 92 93.
That's about right for the entire bank. 2.2 for each cylinder is quite normal. What you want to watch is the BLM counts. 128 is a perfect BLM. Numbers higher is adding fuel and lower is taking it away. Again, high blm is lean and below 128 is rich. Lt1's drive me crazy because the banks are always different and there's only one fuel map for the 92 93.
Thanks I've been trying for like half a year to bring down the left BLM. I have improved it, but it's driven me crazy.
In your top pic I would take 134 + 120 / 2 = 127. Doesn't get much closer than that. You could take that 127 / 124 = and then multiply by the VE in that cell to richen it a little?
From: Las Vegas - Just stop perpetuating myths please.
Originally Posted by 1993C4LT1
Thanks I've been trying for like half a year to bring down the left BLM. I have improved it, but it's driven me crazy.
Yea, this all at very low rpm (650) so it reads like your having problems at the "break point" of the PW. BP is only 1ms to 3ms. I read there are 2 different methods used for compensation at these low injector flows. I think one is a time constant is added to the PW command and the other uses separate low and high injector flow slopes.
Im no expect and u need to do your own research here. But please share with us hear what u find.
BTW the PW does become important to determine duty cycle as it should never exceed 85% of duty cycle and is physically limited to 100% (cant flow more than 100% of the time).
Yea, this all at very low rpm (650) so it reads like your having problems at the "break point" of the PW. BP is only 1ms to 3ms. I read there are 2 different methods used for compensation at these low injector flows. I think one is a time constant is added to the PW command and the other uses separate low and high injector flow slopes.
Im no expect and u need to do your own research here. But please share with us hear what u find.
BTW the PW does become important to determine duty cycle as it should never exceed 85% of duty cycle and is physically limited to 100% (cant flow more than 100% of the time).
Hope this can help.
Will let you guys know if I find anything.
Originally Posted by Cliff Harris
I heard of a guy who fixed his right/left bank BLM imbalance by swapping O2 sensors from one side to the other.
Thanks, will give this a try soon.
I want to do 1.6 roller rockers and longtubes to my car. IAC is at zero with the engine warm. No exhaust leaks, no vacuum leaks. Did smoke tests, and water tests for vacuum leaks, nothing found. Since my IAC is at zero, do you think a tuner will still want to tune it?
But seriously.....THe OP might find more info if he contacted a tuner. There is a section just for C4 Tuning ya know.
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Steve, the real problem with the 92 93 model years is 2 o2's but only 1 VE table to tune. that's why I said earlier to combine the BLM's divide by 2 and use that as the multiplier for that cell. If Cliff's suggestion works it's worth a try.
Scott
Injector Bank Pulse Width for LT1?
I've been trying for like half a year to bring down the left BLM. I have improved it, but it's driven me crazy.
