Project C4, 85 Corvette

[Steve85]

I spent some time this morning working on the rich idle issue. Without cats there is only so much stink I can take out of it but I know it can be much better.

I was doing some research on how to combat cam overlap. One solution was running open loop all the time, not something I want to do. The other I came across was driving up the target A/F ratio. One person I spoke with said his wideband reads 17:1 when the mixture is correct.

I started pushing A/F table up and up and found my injectors are likely too big, duty cycle drops and stays at 2%. I'm guessing that is some sort of built in safety feature or limit. They are 50# and I have a set of 42's on the shelf ready to go. (I'm working on being able to post the screen shots)

It's been fun so far. I am learnring a lot about what goes into a complete tune.

I have driven the car though and it feels much better but it always does after months of not driving it. Track times will tell the tale. Until then I will work on cruise and tuning and save WOT for spring.

I did the get the dipstick installed :oops: . The block has no provision, luckily Canton provides a stick that goes directly in the pan.

So that's it for today, we will see what the 42's bring tomorrow.