For discussion of Speeduino compatible boards designed / built by other members of the forum and for guidance around making such a board
By phsouza
#49253
So for that I need to use 2 wires (inj 1 (1/2 + 2/2)) to use 4 injector in sequential mode?
User avatar
By jonbill
#49254
you need 4 injector channels to run sequential on a 4 cylinder engine.
Speeduino offers a pair of wires per channel to carry more current. It's up to you whether you choose to use one or two wires per channel on the IDE cable and connectors, but either way, the same signal is on both.
By phsouza
#49255
jonbill wrote: Tue Mar 23, 2021 3:42 pm you need 4 injector channels to run sequential on a 4 cylinder engine.
Speeduino offers a pair of wires per channel to carry more current. It's up to you whether you choose to use one or two wires per channel on the IDE cable and connectors, but either way, the same signal is on both.
Nice! Thanks a lot, now I understand.
User avatar
By PSIG
#49261
As the IDC cables commonly used on v0.4 boards are only 26 to 30 AWG (some suppliers offer heavy-duty 22AWG versions), and the IDC pins and connector terminals are commonly rated only 1-amp per-pin (expensive 3A versions available), it is strongly suggested to use both pins of each injector channel (INJ1 1/2 & 2/2, etc) on any installation, as shown in this post: viewtopic.php?f=19&t=3935&p=42836&#p42836
User avatar
By jeje_gominha
#68989
PSIG wrote: Sun Jan 31, 2021 4:11 pm
alecpicanco wrote: Sun Jan 31, 2021 6:00 am...It uses a inline six cylinders and those Siamese heads. Many mechanics say that the hit is only good if the injection is sequential.
This assumption is not entirely correct. In-fact, the opposite is mostly true, that most forms of fueling are even, except un-timed single-squirt port injection. Siamese ports are unique for fuel distribution, but are generally consistent in their charge-stealing (cross-fueling). A good understanding of the odd flow dynamics is required, and there are web references for testing data. Constant-flow injection, carburetors, TBI, multi-injection semi-sequential port, and sequential can all fuel evenly when set-up properly.
I use a TBI setup in this engine with very good results. The siamese port 250 inline 6 cylinder used in the Opala seems to "like" using setups similar to carburetors (i.e. throttle body injection). In my case it is a Holley #502-7 2-barrel unit and MS2Extra ECU. Now I'm testing a different TB unit and speeduino ECU.

I'm having fun in multiplayer mode! I can observe […]

Hello, I know this thread is little bit older, but[…]

Both crank and cam inputs have optional pull-ups w[…]

Yes aux io is 0-1024 , there is no scaling or form[…]

Still can't find what you're looking for?