Hi everyone first of all i did search for this and there is a lot of information out there but i tried what i understood from all that information with my Tunercat and it really didn't change anything in my car. It's really weird how no matter what i do the car idles the same and the BLM Never changed but still it was running rich (you could smell it and it said more than .5 volts in the stock sensors which is about 14.7 but since i have a cc306 cam i know it should read leaner to really get it right) Well sorry guys if i'm making you repeat yourselves but its that i don't know what i'm missing in my tunning. Thanks in advance

 

BTW I got no Cat and weather is pretty same all year round (Puerto Rico) that is if i don't bring the car up to Ohio (where i'm studying) so i can basically tune tables or open loop or what ever works. And the other thing i'm just a noob on this tunning thing so please explain as if i was an idiot(which might not be so far from the truth ) If anyone needs i got my tunes and logs so i can supply it if you think it would be easier to spot the problem.

 

If Im reading this correctly. You have a 306 cam and as of right its runnign rich at idle?. Now if thats true, is it running rich in open or closed loop? or both

 

I really don't know because i tried changing between them from what i read from another really really long thread, but nothing seem to change right now i left it closed since it is what i had initially.

 

I tried PE Idle in mine in closed loop and id did not help at all. The only way I was able to lean the idle was with an open loop tune.
You can adjust the AFR at idle a bit by changing the injector offsets.
You can also lean it out by using the open loop afr vrs load vrs coolant tables. You will need logging software and a wideband to monitor the effect of your changes and really get it right. I do my tuning with LT1 edit, I can´t help with Tunercat, but i think the programs are very similar. There is a writeup by LJ regarding this OL tuning using the O2 sensors I saved from the LT1 Edit forum. It is quite straightforward. You will need at least the logging software.

RG

 

I do have Freescan and LM wideband. How exactly do i do a Open loop tune I was thinking that PE idle was the way to make it Open. Enlighten me about open loop please.

 

First thing you have to do is make sure your car stays in open loop all the time. You do this by increasing both closed loop enable temp values to 150 deg C.

After that you will have to do some logging with your wideband and determine what your AFR is over the operating range. Then you must decide where to adjust. The following was posted by LJStevens in another forum. I saved it because it explains it quite well:

Open loop fueling Tuning

You have 3 fuel control ***** to turn; injector constant, injector
offset, and the MAF table.

You'd change the injector constant if your fueling was more or less
equally screwed up everywhere, such as when swapping in 32# injectors
in place of 24s. Changing the constant will have the same relative
affect on idle, cruise, and WOT. Let's say those pulsewidths were
idle: 2.4 ms
cruise: 5 ms
WOT: 18 ms
If you change the injector constant from 24 to 32, they will become:
idle: 2.4 * (24/32) = 2.4 * 0.75 = 1.8 ms
cruise: 5 * (24/32) = 5 * 0.75 = 3.8 ms
WOT: 18 * (24/32) = 18 * 0.75 = 13.5 ms

The injector offset has a fairly big influence on small pulsewidths
and almost none on long pulsewidths. Let's say you changed the offset
by 0.5 ms (which is a pretty big change). Using the same example:
idle: 2.4 ms
cruise: 5 ms
WOT: 18 ms
Now subtract 0.5 from the offset:
idle: 2.4 - 0.5 = 1.9 ms This is a 20.8% change!
cruise: 5 - 0.5 = 4.5 ms This is a 10% change
WOT: 18 - 0.5 = 17.5 ms This is only a 2.8% change.

If you need to make fueling changes in just a couple of operating
regions, you can tweak the MAF table. Unless you are pig rich, you
can use the stock O2 sensor to guide these pinpoint changes. I posted
the technique I used here a while back -LJ

 

Really good info will try it out. I got a wide band so will see what happens. Gracias Amigo!!

 

I checked my tunes and only one of the closed loop things where at 150. Will try it now with both in 150 should work.