Yeah, I'm lost now. You're probably just going to have to start playing with the VE tables by doing the ratio against 128 like you're saying.

Once you're not pegged at 128 BLM anymore, the ECM may start being able to trim your fueling back to 14.7. It's just out of adjustment range right now, which may be why you're seeing ~13:1 on the WB.

 

that’s why I said I’m using a prior tune given/bought and trying to fix. Your offsets alone made the car not break up or surge or jerk. I call that a win.
now if I start leaning it on the ve table do I do the entire tables or just the 45kpa-60kpa that I saw?
also if the motor doesn’t like it I’m leaving it at 13.1

 

Or should I copy and paste the stock ve tables and go off of that

 

You could try going back to stock tables with the new offsets and see where you end up. Then work from there. Sometimes going back to the baseline is better.

 

I’m starting to agree totally

I got two tuners fuel maps. Plus stock. I’ll make a few lol

 

The conventional LT1 tune assumes a vacuum compensated fuel rail pressure. There should be a vacuum line running to your fuel pressure regulator. With your cam, idle pressure should probably be in the range of 36-38 PSIg. Similar when you are cruising at low throttle position. Pressure should only approach 43-44 PSIg when you open the throttle and vacuum drops to near “0”.

THIS IS 94 and up. 93 regulator should be on the back of the passenger side rail.

http://shbox.com/1/fp_reg.jpg

When you do a closed throttle decel, does the gauge pressure drop closer to 30 PSIg?

Fuel flow through the injectors is controlled by the DIFFERENTIAL pressure across the injectors. The means rail pressure (what you see on you gauge) minus intake manifold vacuum. The DIFFERENTIAL pressure should be 43.5 PSIg at all times. The rail pressure should move based on throttle activity.

If the tune is based on vacuum compensated fuel pressure (and I have never seen an LT1 running a stock ECM/PCM without fuel pressure varying with intak manifol vacuum) s could explain stumbles, running rich, etc.

 

not running a 93 intake anymore but that doesn’t matter
. I’ve played with the tune. I took almost 15% of fuel on PE vs rpm and the thing is still 11.9 wot in 3rd worse in 4th
I even took 2% off the entire ve tables and right around 55-65kpa it starts doing its thing
I think this is where my idle range is as well.

my wideband sits right at 13.7-14.2 and I’m fine with that. Those BLM’s can kiss it. My car does not want less fuel in that area...

so I pulled all tunes and put old tune in with other offsets in and I’m just gonna leave it. And just buy the tq head set up

 

Does your non-stock intake manifold have a connection for fuel pressure regulator vacuum, and is it hooked up? Appears you've given up, but could you at least answer this one question?

 

What intake are you running?

 

Saying it’s not a 93. It’s a 94 and up. Left that out when typing still just a stock intake ported

 

And is the vacuum compensation line attached to the fuel pressure regulator as shown in Shoebox's photo? Because if it isn't, or even if it is connected but not holding vacuum, that could be contributing to your fueling problems. You indicate your two mail-order tuners have told you it’s a problem with the engine, not rheir tunes.

 

yes it’s plugged in.

 

Then your fuel pressure shouldn't be:





Fuel pressure should be varying with throttle movement, and should drop significantly on closed throttle decel (high vacuum),

Something doesnt add up here.

 

The fuel pressure is fine. When I was about all through the drive I was meaning when I was testing wot passes. Rest of the time I didn’t pay attention
btw my tune now is almost spot on the changes I made were too aggressive and car wants fuel

my afr at idle is 13.9 my wot passes 3rd 12.6-12.9 4th was 12.4-12.5 driving around it never got over 15 unless shifting mostly stayed 13.9-14.2

i new it was the tune not all this other bs but for the guy who supplied the correct offsets. That in itself was worth all the trouble just had to retune it.

 

instead of coming off as a dick you should of asked for clarification instead of copy pasting to smush in my face like I’m an idiot.