With speed as the car goes down the track, it just gradually goes down.
Is there any way to reset it in Tuner Cat?

Or... is this just the nature of the beast?

I have tried adjusting it by adding fuel % vs. the RPM's ....not the results I was looking for.

 

The response of narrowband sensors varies with temperature, maybe that has something to do with it on a prolonged blast down the strip?

 

What sort of injector duty cycle are you seeing?

How about fuel pressure as well?

How far is it dropping?

 

EGTs will effect a stock O2 sensors output.

Also the longer in PE mode, additional fuel is needed for in cylinder cooling.

If you're using a Bosch sensor, they'll do that, just *cause*.

It's just another reason to run a WB, so you can see what's really going on, IMO.

 

02 sensor= AC Delco heated

Ok, making changes to the table "PE vs. RPM's" has made a definate difference, but I was looking for a way to just add fuel where it looked like it was needed.

We just converted a MAF car to SD and he has just the opposite, 02 rise as it goes down the track.
I have compared the settings but have not run across any real differences that stick out.


What sort of injector duty cycle are you seeing? 70-76%

How about fuel pressure as well? 48#


How far is it dropping?
@4000pm's in 4th 890's to 850's @4800

 

A time in PE or VSS compensation correction table sounds like the answer, but that means patching the code.

Now that is odd, are the burst knock setting the same?, just guessing here, as that's the only thing possibly related to what you're doing that crosses my mind.

As you crank the FP up the volume goes down, maybe you're out of pump for what your doing.

850s are considered a safe value by some of the Turbo Regal guys as being rich enough.

 

We are both running the same pump (LT1 31gph)

It seems to like 02's in the 890- 905 range. The closer to 900 the better it runs.

 

A 240?
I run out of fuel when I was running a single 340.

You might try running a FP guage on the return line, and if you have enough fuel. Yes, on the return line, that insures that your reading reflects the pump still having an excess of fuel.

 

No problem there, I checked that. I can get it to over 900 in 4th but then it is at 930-940 at the beginning.
I just thought there might be something I was missing to make the correction.
Thanks for the help,
Don>>>