EFIDynoTuning Forum

I figured I was probably over-thinking it. Would that be an indication that the MAF is intended for 19 or 24lb injectors? It's an 80mm C&L with a .650 tube, which doesn't match any calibration info I was able to find.

This question may have a simple answer, so go easy on me....I'm fairly new to tuning...

I recently got a 347 put together, and for the purposes of breaking it in, I ran the 24lb injectors that came with my car. I hadn't messed with tuning the MAF, outside of idle, because I knew my injectors were inadequate. I will also note that I had no info on these injectors other than they look like old Holley ones.

I have a C&L 80mm MAF with a sample tube that doesn't fit any of the known combinations, and I installed 47lb Ford injectors and changed all injector settings according to the Ford info.

Rather than take my 24lb MAF transfer and scale up, I took the 42lb Fox calibration and scaled it by a factor of 1.119 (47/42)

Using this transfer, it was so far off the car wouldn't run. In fact, I had to reduce the transfer by about 50% in the idle area to even get it close.

Is there some finer point of MAF tuning I'm missing here, or is this sort of to be expected? Possibly the result of a weird MAF setup? The old 24lb transfer worked perfectly the first time I fired it up.

Thanks in advance!