Weber 44 idf flat spot Options

[tornik550]

So I recently purchased new weber 44 idf's. They didn't work out well so I went back to an old set of weber 44 idf's that I had. I thoroughly cleaned the carbs, sprayed carb cleaner through all jets, tubes, etc. I have also balanced the linkage. Set the floats, etc.

The car starts well. Idle's well. When I drive the car I get a major flat spot between 1500 and 3000 rpm's. Below and above the car accelerates normally.

What changes should I make?

My current setup for my 2258 (dual webers, big cam)
-idle 55
-main 160
-et F11
-ac 200
-vents 36

Are there other issues that can cause this type of problem (timing,etc?)

[tornik550]

I have worked out my flat spot. I found that the accelerator pumps on one carb were partially plugged.

I have ordered several sets of venturis in different sizes. Although my engine is running very well right now, would there be any reason for me to change to a different size venturi? I have weber 44 idf's with 36mm vents. I get decent low end torque and excellent high end power. I ordered 34 and 32 vents.

[ChrisFoley]

I have worked out my flat spot. I found that the accelerator pumps on one carb were partially plugged.

I have ordered several sets of venturis in different sizes. Although my engine is running very well right now, would there be any reason for me to change to a different size venturi? I have weber 44 idf's with 36mm vents. I get decent low end torque and excellent high end power. I ordered 34 and 32 vents.

I would leave it alone unless you have data from a wideband O2 which suggests otherwise.

[tornik550]

I have worked out my flat spot. I found that the accelerator pumps on one carb were partially plugged.

I have ordered several sets of venturis in different sizes. Although my engine is running very well right now, would there be any reason for me to change to a different size venturi? I have weber 44 idf's with 36mm vents. I get decent low end torque and excellent high end power. I ordered 34 and 32 vents.

I would leave it alone unless you have data from a wideband O2 which suggests otherwise.

The only issue that I am having on the wideband is that I am very rich at idle, everywhere else is perfect. If I go down on idle jet size, then idle improves but screws up everything else.

[Jake Raby]

The only issue that I am having on the wideband is that I am very rich at idle, everywhere else is perfect. If I go down on idle jet size, then idle improves but screws up everything else.

Then adjust the mixture control circuits.