Injector Setup
Injector size & timing parameters
I have estimated the size of Rover v8 injectors at around 220 cc/min. I have used just over middle-of-the-road values for opening times based on stuff found in the wiki [add link!!]
Does anyone have more accurate info? They aren't flow matched from the factory and are quite old, so given the tolerances for them reported on Piston Heads it'll do for now. (I plan to change the injectors shortly anyway - and when I do, they will be flow matched and tested.)
[add config section for injector parameters here]
Any comments would be appreciated
Injector firing order & h Table setup
Firing order is 1-8- - - - - - .
I will be running banks of 2 injectors (so there are 4 banks) until I get the cam trigger working (this can't be done until my coils arrive).
Q: Is the correct way of doing this to repeat the group of 4 items in the h[0] table?
A: I would configure them sequential anyway (drive one injector at a time) instead of banked. On the 4 and 6cyl engines i've tuned that has worked the best. Also when you have wired this way you are free to change to low-z injectors any time, also configure them banked if you really want to//Emil
Agreed that sequential is best. I just can't have it yet as I have no cam sync signal at the moment (only have crank trigger), so can't tell which phase the engine is in.
Q: Does it actually matter if there's no camsync - will VEMS fire 2 injectors anyway if it can't find a camsync?
A: Yep this works fine without camsync, just set up alternate injector 7...0 and fill in the injector table with all outputs, 0x01 to 0x80
Wiring
Injector wiring was completed & tested last night. It looks better than the factory wiring!
Also took the time to hoover out the soil and powdered grot from engine. (Best not to ask...) It looks a whole lot cleaner now.
Low Z and High Z comments
Me:Low-Z injectors seem expensive and quite rare to me as they only seem to be used on Japanese cars. I'll be sticking with high Z ones as they're easy to get.
Answer: I was lost in the small but high powered 4 cyl turbo world, where we usually get aftermarket injectors (500CC/min and up), and good large injectors are always low-z.
Me: My other car is a modified Impreza STi RA with 550cc/min low-z injectors... The Griffith will survive with 400cc/min high impedance still can be fuelled to >350 bhp.
Answer: BTW, Feel free to join the IRC chat, see ChatViaIrc page
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