| First, I want to say that I advised some Z-friends on a foreign forum to buy Jim's translator because 1) it's very accurate and 2) it's the easiest upgraded part to install on a Z. "This circuit is off by as much as 25% when used to average and as much as 50% when used to add!"
I agree with the 2nd statement : never use this analog circuit to add non linear values. It can't be accurate even with balanced flows. But in average mode, having a 25% difference with the theoritical value means your flows are really unbalanced and there's a serious turbo/intake/engine problem to fix. Using a dual pop / single MAF would also give a difference in the TP value since only 1 side would be measured. If you look at the VQ graph - I mean the Flow=f(MAFvoltage) function - it's not a linear function but for similar MAF voltages (say +/- 5%) you can approximate a linear function with a very low error. And if your MAFs are more than 5% unbalanced, you'll have serious AFR issues : 11.5AFR + 5% = 12.1AFR which is leaner and may have a bad effect on your engine in high load condition.
So I hope all MAFs are accurate and all flows are well balanced +/- 5%. In those conditions, the analog circuit will not give a 25% error.
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03:38:40 11/02/09
