A/F Ratio Need Opinions

**InferAl** · 04-19-2007, 02:03 PM

Just had the car Dynoed and this is the A/F graph the blue line is before Heads and Cam and B&G at the tailpipe. The red is today with the sniffer in the sensor bung right after the cats. What do you guys think about this looks kind choppy

**lafrad** · 04-19-2007, 02:06 PM

Well, if they dyno'd *right after* installing the computer, it has had NO time to work out the adaptive fuel maps, and WILL run lean, because its assuming a stock cam & Heads.

Currently, I *NEVER* go WOT unless I have at least 10 minutes of "run time" on the computer.

Those numbers look rather lean, so I would go out and drive it a bit so it can learn whats going on.. then redyno.

Also, how did you get it to run out past 6K?

**mhigham** · 04-19-2007, 02:07 PM

Maybe because of the cats? If they were starting to light off after storing O2, it could do that I guess.
Did your torque curve look similar? Those kinds of swings you should see it in the power.

Mike

**InferAl** · 04-19-2007, 02:44 PM

Originally Posted by lafrad

Well, if they dyno'd *right after* installing the computer, it has had NO time to work out the adaptive fuel maps, and WILL run lean, because its assuming a stock cam & Heads.

Currently, I *NEVER* go WOT unless I have at least 10 minutes of "run time" on the computer.

Those numbers look rather lean, so I would go out and drive it a bit so it can learn whats going on.. then redyno.

Also, how did you get it to run out past 6K?

I have 300 miles on the B&G computer and I don't know how it got past 6k I will be doing another thread on the dyno what a disaster that was if I have time before I hit the dealer to see what the cel is, I am pretty sure it was tranny limp mode again during every pull

**lafrad** · 04-19-2007, 02:45 PM

how Much "on time" was there since the last battery disconnect? 300 miles?

**Cam** · 04-19-2007, 02:46 PM

What code is it??. And every pull you went into limp mode. How?? or should I say what were you doing. Did you auto shift up to third and then start the pull. And then at what point (RPM) did it go into limp mode.

**Cam** · 04-19-2007, 02:47 PM

Did you know how to pull up the codes on the evic????.

**InferAl** · 04-19-2007, 02:57 PM

Here is one dyno graph before I gotta run the blue one was my baseline before Heads. cam and B&G. He said when it got up around 5k it felt like something was going on with traction control and I asked him if it could have been the Converter and he said no it wasn't the converter, but it was in Autostick 3rd gear and he said 4th and 5th just flashed on the display and it was done. On one run it sounded like it shifted to 4th and the lines on the graph shot staight up on the sheet and it read 378 rwhp. Even Eric at akron Horsepower said till I get some RPM I won't be able to take advantage of the power, he also felt that at the point where all this was taking place it was leaning out and probably needing to get fuel and at the end where it goes up a hair maybe the computer was trying to start toi compensate