Hi guys;

I've installed 36lb Bosch injectors to my car, and on the emissions it is horrible.

The HC level is around 2000ppm!

I have a cam (223/227@114 LC 0.592” lift use a valve spring with a lift of 0.600’) and full headers + high flow cat and no catalyzer.

I've used the ASA 2000/2002 corvette injector sizings and also tried some other resources, and even tried a stock tune with idle parameters, and cannot seem to get around it.

Is it really big for an LS1 5.7 with above additions to it?

should I use the stock injector sizing? would the stock duty cycle will be high or not?

any inputs are appreciated...

Thanks
Evren