mk e wrote: ↑
Sun Oct 14, 2018 4:09 pm
Keith Morganstein wrote: ↑
Sun Oct 14, 2018 12:33 pm
mk e wrote: ↑
Sun Oct 14, 2018 10:48 am
Waste spark is fine but batch or semi-sequential fuel kind of sucks and that's what you'd be stuck with if you choose a 4cyl ecu like a microsquirt.
There seems to be proponents both of sequential and batch. (And “enthusiastic discussions” about their merits)
The only proponents of batch are the people who buggered up there fuel rail sizing so badly it won't run any other way and they don't want to fix it.
The only proponents of semi-sequential are people too cheap to buy a proper ecu or too lazy to install the proper sensors required for full sequential.
Seriously....those systems both fall in "the better than nothing" bucket. I don't think there has ever been an oem batch-fire anything and semi-sequential came and went pretty quick...because it doesn't work all that well. The higher end oems suck to mechanical continuous injection until sequential options were available, that should tell you something. The difference is only a couple hundred $ between and ecu that does everything right and the cheapest option you can possibly find to make work.....the ecu is the brain of the engine and controls how the entire project acts, why on earth would you pick one of the most critical components to skimp on? Seems like penny wise and pound foolish to me but it is your money and your project so I hope all turns out to your liking.
LT1 ecm cars, 92-97 GM V-8s all had batch fire to one degree or another. Some like the early years were batch only, the rest would do sequential at idle and do a blended mode up to 3000rpm before becoming batch fire.
Whats with the dislike of Megasquirt? I wonder how many people that are commenting here have actually tried a new Megasquirt 3 system.
I have a Megasquirt 3 (engine control) and a Microsquirt (transmission control) hooked up by CANBUS to drive my automatic transmission and turbo V8 car. A Microsquirt can run a V8 engine in batch mode. The downside to running a Micro is that you only have one 35 pin connector and you run out of room very quickly on your inputs and outputs. Also as mentioned earlier you won't be able to use a IAC 4 wire GM stepper motor. Instead you'll have to do a little messing around with spark and fuel to get it to idle.... or buy the IAC add on.
When I bought my MS3 a few years back I got an ECU and harness, 80lb Siemens Deka Injectors, TCU and harness, all for the price of what a bare Holley Dominator box cost.
I have a turbo LS street car running a GM flexfuel sensor, water/methanol injection, idling 210lb injectors, CANBUS communication to a electronically controlled 4L80e transmission, CANBUS to a Racepak street dash.
The MS3 box has two 35 pin connectors so there is a ton of room for sensors and inputs/outputs.
I still haven't used fan control, Variable Valve Timing, Fuel Table Switch, Nitrous, Turbo Anti Lag, Launch Control, Transbrake or a few of the sensor inputs.
So many options to mess with, when I ran it on the engine dyno it was pretty amazing to be able to just on the fly change fueling and timing without having to shut off the engine and make adjustments to a distributor or carb. I got a whole lot more pulls on the dyno that I normally do with a carb engine for the same amount of time on the dyno.