Quote:
Originally Posted by supremeefi
Also, can't be true sequential if there is no cam sensor.
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While this doesn't apply to the Massflo system you
can have full sequential injection without a cam sensor using only a reluctor wheel on the crank that has enough teeth to provide a high resolution crank signal to the ECU and the ECU has both the processing power and necessary software scheme to decode the crank signal. The ECU can watch the angular acceleration/deceleration of each tooth of the reluctor wheel during compression & firing and calculate/decode the firing order based on the individual tooth accel/decel and then run full sequential injection and also drive coil-per-plug without a cam sensor. I helped set up a Porsche 356 that's coil per plug and sequential injection with no cam sensor needed... and it works great. It's a Pantera 882 ECU by the way, I also have one sitting in the box waiting for my TT LS2 if I ever get it finished. My LS2 will still use a cam sensor although it isn't 100% needed with the 882; the cam sensor is still good for the ECU to do a firing order sanity check and "noise filtering" by comparing the cam signal to the decoded crank signal.
Back to Mass Flo, while I haven't used their specific setup I have messed with a couple of EEC-IV's using twEECer a while back in their native environments (5.0 mustangs.) While the EEC-IV and TFI distributor combo is getting a bit dated it can still run very well (both are readily available and easy to retrofit onto almost anything, probably why they chose it)-- but as was mentioned there are limitations when you get really "wild" with the engine combo. Mass Flo seems to really market to the "bolt on and go" crowd that wants EFI but really doesn't want to mess with it or learn the ins and outs.
My personal preference is for a more modern ECU and a crank reluctor wheel setup for its greater accuracy compared to a distributor trigger setup (no distributor gear backlash, no timing chain slack, etc to throw off injection & spark timing.) Lots more options to grow and change things in the future.