i just dynoed my car and the numbers were depressing...

my AFR was at 10 and the guy dynoing my car said it has like 40 more HP that can be opened up if i lean it out

im super new to tunerpro, i have only done a few things like deleted A/C and EGR, can someone help me lean out my car?

i did datalog yesterday for about 15 minutes. is there a way to upload my datalog so people can take a look and see where my car is needing to be leaned out?

my BLM right now is pretty constant at 160 from what i remember it should be at 128

 

need alot more information than that.

What is your motor combo and what system are you using? Speed density according to your screen name with a 91 camaro? TPI/TBI?

 

In Tunerpro RT, a simple way without having to open the data log as a spreadsheet, is to set up your "monitor" screens as follows. Note where you have the big D S F M at the top of your screen. If you don't see that, go to the viewing of tools and find it.
Click on the M and four blank screens will show up. You can set them for what you want by right clicking on a particular screen, I chose RPM, KPA and BLM fine.

Now you can then watch as the data strolls by that you recorded. Click on the play arrows like you are watching video. I usually take the pointer and slide it back an forth to show where the worst biggest peaks and valleys are. Start with them.

Note where the BLM's are lowest first, below 128. The reason is that too lean is worse than too rich. LEAN FRIES MOTORS, RICH WASTES GAS. So while you are there, might as well look for the lean spots as well. Take the BLM for a given rpm/kpa bad spot. Divide it by 128, and write the answer down. Take the fuel table for the same rpm/kpa and divide that number by wrote you wrote down. this is the new number that goes bacl into your fuel map
ex. 1200 rpm and 60kpa reads BLM of 148, 148/128=1.15 Take the number in your fuel table for 1200rpm/60kpa (imagine it said 65) 65/1.15= 56.5 put that in the box, this just lowered your rich fuel at that point.


Check for, and do several of these around the same area like 1100/55 1200/70, 1400 at 60 and you'll get a picture of that whole area.

Go to the graph function next and all your new points will look like peaks and valleys. This gives you a great visual on how far out of whack things are in that area. Smooth the areas around those points by using your arrow at any given point. While holding the left click button down you can raise or lower any point on the graph. Don't forget to save the file as a different name, maybe include the date. Load your ECM with the new Bin.

Go data log again and you'll get a handle on more and more points on your table/graph.

Hope this helps. let us know.

( Guru's please pick this apart If I am wrong or misleading with the information)

 

sorry i should have put all my info down

its a 5.7L 350 bored 30 over TPI speed density

and thanks man for actually explaining how to do it, that makes sense, ill give it a try!

 

The BLM at 160 is an issue. This is probably causing the low AFR. The BLM if 128 or higher is used during WOT. Which at 160 will add a lot of fuel.

Is the O2 sensor in the stock location? Or is it down stream in long tube headers? For the latter a 3-wire heated O2 sensor is required.

RBob.

 

O2 sensor is in the driver side header, its a shorty header, should I be usin a 3 wire?

 

Should be OK with the stock 1-wire O2. Noted that the engine was rebuilt, stock heads & cam? May need to do some serious work on the VE tables.

RBob.

 

yep stock heads and cam

 

Make sure that there aren't any leaks in the headers.

RBob.

 

Reconfirm your base timing with a light and check that the value is set correctly in the bin too.
Clean off or change your spark plugs and check the wires/ignition.
Once you get a misfire you will read lean on the O2 sensor which will add more fuel to an already rich situation making the problem worse.