I have a general question here, it doesn't relate to my Camaro but a project car I'm building. I haven't taken it for its first emissions test yet, but I want to do what I can to ensure it passes. The thing is I'm sure its running a little too rich to pass the MOT test.

Is it wise to attempt to control fuel pressure by using a resistor, possibly a variable resistor inline with the live feed to the fuel pump to slow it down a little?
The motor has a forged bottom end so its not at great risk from det. This would only be a temporary measure until I can afford an afpr and a tune.

The motor wouldn't run right with smaller injectors, but I think the larger ones I'm using are overkill at idle. I'm not ready to get the ECU properly tuned yet so I'm going to botch it so I can at least get the car road legal.

I'm trying to understand the effect a slower pump speed will have on the fuel pressure at the injectors at idle and maybe a little higher in the powerband.

FYI this is a 2.0L Opel 20XE motor, bored and stroked to 2.3L and turbocharged with a hybrid T3. Stock Motronic ECU from a turbo version of the same engine. I'm using am using a cat.

 

Lowering the voltage to your pump to reduce flow probably will not drop the fuel pressure very much under the low demand of a smog test. I'd suggest an adjustable fuel pressure regulator to drop the pressure.