Weber Look A Like Fuel Injection!

[Cobra #3170]

The carb starts fine when it is cold however when the engine is hot it will not start if you look at the throttle, any movement of throttle linkage dumps enough raw fuel to make for a very slow and rich start, it is a single plane manifold so the fuel runs right down the ports.
The EFI has a temperature curve that you can adjust for starting. You can adjust starting injector pulse width down as temperature goes up and can even adjust the rpm that determines when the engine is running and adjust the pulse width at that point too. I have an MSD with Blaster coil so the ignition is up to it if the plugs aren't soaked. This is not a street carb and has no choke plate so it is not a direct comparison to a street carb.

Originally Posted by TButtrick

Doesn't your EFI ECM lengthen the injector pulse width to give the motor the same fuel shot on startup? A carbed car that doesn't start just as quick or "easily" as EFI has the carb setup incorrectly.

[TButtrick]

Originally Posted by Cobra #3170

The carb starts fine when it is cold however when the engine is hot it will not start if you look at the throttle, any movement of throttle linkage dumps enough raw fuel to make for a very slow and rich start, it is a single plane manifold so the fuel runs right down the ports.

My experience is the opposite. On a cold first start of the day, I give a half squeeze of the throttle and no choke. Starts first crank. Subsequent warm starts throughout the day, I don't touch the throttle and starts first crank.

[fkemmerer]

Originally Posted by TButtrick

My experience is the opposite. On a cold first start of the day, I give a half squeeze of the throttle and no choke. Starts first crank. Subsequent warm starts throughout the day, I don't touch the throttle and starts first crank.

Sounds like you are acting as the "computer brain" to make the carb "smart" .
Seriously, this is one of the fundamental advantages of EFI - the computer does a much more precise job of fuel and timing delivery in a broader range of conditions that our engines operate in. This is especially important on the street where a motor must operate over a much broader range of temperatures, loads, transient conditions, etc. than a race car would encounter.

- Fred