- Wed Feb 17, 2021 7:22 am
#48398
Bit of a weird question here I think, but on my journey into learning FI and Speeduino this is where I got too...
My car is a 1989 Na6 MX5/Miata, I had it running on Wasted Spark + Batch injection successfully. Speeduino is an 0.4.3
I changed it to Sequential Ignition, but it wouldn't run. So following advice on the Facebook page I swapped channels 1+4 and 2+3, and surprise it ran fine. But I am 99.9% sure the wiring to the COPs is correct, I've traced it with a multimeter, and using the test function on Tuner Studio, spark plug 1 fires with channel 1, spark plug 3 fires with channel 2 etc, firing order 1-3-4-2. Verified by a second set of eyes too.
Timing is correct, and checked with a timing light too.
I then made the change to Sequential Injection, and it fired up and ran fine, no need to 'reverse' the channels.
So my question is (eventually...) how do I know if I'm injecting into the open valve (as it should be) or just injecting into the back of the valve (like it does 50% of the time on batch injection) Would it run at all if the sequential injection cycle was opposite to what it should be? Does that make sense?
Because with batch, I understand 50% goes onto the back of the valve, and on the next crank revolution the next injection 50% joins that pool of fuel and goes right into the cylinder. Could it be I have 100% going onto the back of the valve rather than into the cylinder? Can it even run like that?
I'm aware speeduino uses 1-2-3-4 for the ignition cycle, and that has to be matched with 1-3-4-2, but there is no way 1 and 1 can get mixed up, but it only works on sequential if COP1 goes to IGN4 ?
But as it is, both running sequential, it seems to drive fine!
My car is a 1989 Na6 MX5/Miata, I had it running on Wasted Spark + Batch injection successfully. Speeduino is an 0.4.3
I changed it to Sequential Ignition, but it wouldn't run. So following advice on the Facebook page I swapped channels 1+4 and 2+3, and surprise it ran fine. But I am 99.9% sure the wiring to the COPs is correct, I've traced it with a multimeter, and using the test function on Tuner Studio, spark plug 1 fires with channel 1, spark plug 3 fires with channel 2 etc, firing order 1-3-4-2. Verified by a second set of eyes too.
Timing is correct, and checked with a timing light too.
I then made the change to Sequential Injection, and it fired up and ran fine, no need to 'reverse' the channels.
So my question is (eventually...) how do I know if I'm injecting into the open valve (as it should be) or just injecting into the back of the valve (like it does 50% of the time on batch injection) Would it run at all if the sequential injection cycle was opposite to what it should be? Does that make sense?
Because with batch, I understand 50% goes onto the back of the valve, and on the next crank revolution the next injection 50% joins that pool of fuel and goes right into the cylinder. Could it be I have 100% going onto the back of the valve rather than into the cylinder? Can it even run like that?
I'm aware speeduino uses 1-2-3-4 for the ignition cycle, and that has to be matched with 1-3-4-2, but there is no way 1 and 1 can get mixed up, but it only works on sequential if COP1 goes to IGN4 ?
But as it is, both running sequential, it seems to drive fine!