Im finally getting ready to start fine tuning my engine. Ive been sending my pcm to and from one of the well known tuners, but I need to learn this myself. The car is running very rich at WOT wideband says 11.0. and is around 14 at 55 mph. Car feels strong and runs good, but I know ther is a little more in it.

The car:

396 stroker with Ai trick flow 215cc heads and 234/242 61x lift cam
58mm and mono blade Throttle body (currentley running the 58mm Holley)
pacesetter longtubes
255 fuel pump
42 lb injectors
3800 yank ss
electric water pump
moser w/410's
Shifts at around 6800

my freescan file: http://www.mediafire.com/file/zgn1yymghdz/730 396 lt1.csv

 

Post your tune also, it will make more sense to the rest of us if we can see why you're getting what you're getting.

Since you have a wideband my suggestion to you is to find the thread on logging it through the a/c port with datamaster. That will make getting it dialed in all kinds of easier.

Edit: At a glance I do not see anything that jumps out at me (besides first gear short shifts a bit), seems that you may just need to tweak the tune a little bit to get it where it needs to be. I will tell you what I think when/if I see the tune.

 

here is the bin file from tunercat:


http://www.mediafire.com/file/mmzihcyqnuw/396 rich at wot.bin

 

Man, somebody really added alot of fuel at high rpm inside of the maf tables.

Also looking at your coolant vs pe table it looks fine, but with whats in the rpm pe table its no wonder you are getting fat air fuel ratios.

In the upper rpm ranges you are actually commanding 11:1 air fuel ratio due to whats in the tables.

Your injectors are set up as 44lb injectors as well (i dont know what pressure they were rated at or what pressure you are running though so that could be correct). If not that explains why your pcm is adding fuel alot of the time during cruise situations since the calculated pulsewidths wont be long enough. Basically, what is the make of the injectors?

Your individual cylinder fuel trims have also been jacked around somewhat effectively eliminated in the off idle range (where they only work to 14% tps anyway).

Open loop fueling looks fine if not a little lean for my tastes.

Your timing is conservative but quite alright. I think you can get away with a bit more timing at idle, and a little less of it jumping around with the overspeed underspeed tables. It would be smoother but perhaps wander around a little more.

Here is the problem with fixing your wot fueling, without good data afr vs rpm via logging its fairly hard to tell what it is in particular that needs adjusting since there are a couple of things that seem to be goofy.

Has your car had fuel delivery problems and things like that in the past that they are trying to get around? Anything peculiar about your maf sensor (ported aftermarket ls1 etc)? Is the car tuned up to be run with dry nitrous or something like that?

I think if you can verify what kind of afr you are getting across a pull so it can be compared to what is commanded, then probably the best thing to do is to fix the commanded air fuel ratios.

Don't get down on whoever tuned it, I have seen much much worse. There are also valid reasons for alot of the things that have been done.

 

I originally got a mail order tune that started the car. I had a shop put the car on the dyno and they hooked a wideband up to the tailpipe and did a pull. This shop didnt have the ability to tune LT1's because they specialize in LSx's. The dyno sheet showed that the car was runnining very lean up top. I sent a copy back to the tuner and he adjusted the fuel. I have later learned that a wideband dangling out of the tailpipe while on the dyno probably didn't give an accurate reading.
dynosheet: http://www.mediafire.com/file/deijtjjncny/dyno sheet.jpg

I have not had a problem with fuel delivery, but I have installed the hot wire fuel kit.
The fuel injectors are Lucas 42lbs.

I also had another issue that my car wouldnt shift from 1-2 unless I got off the gas peddle and got back on it. The tuner fixed that issue with the no stall fix. I have since got a performabuilt lvl 2 and sent the pcm back and had him take that out. My car wont downshift fro 2-1 if Im cruising at low speed and want to stomp it without manually downshifting.

I really appreciate the help, but Im still very new at this and there are 99 tables in the tunercat program. If you have any advice please give me the exact name of the table I should look at.

 

Well in that case you could pm me your email address and I could send you a file with a few changes made to it. ie Give you back a stock maf calibration and still keep the fueling conservative a/f wise. Also take care of a few little tweaks to help drivability just a bit. I can probably take care of that first gear kickdown problem while i'm at it too.

Then once you're in the ballpark with a solid calibration, I can tell you what to do to finish adjustments one bit at a time so you still get to learn rather than me doing it all.

Let me know.

 

"Well in that case you could pm me your email address and I could send you a file with a few changes made to it. ie Give you back a stock maf calibration and still keep the fueling conservative a/f wise. Also take care of a few little tweaks to help drivability just a bit. I can probably take care of that first gear kickdown problem while i'm at it too.

Then once you're in the ballpark with a solid calibration, I can tell you what to do to finish adjustments one bit at a time so you still get to learn rather than me doing it all"

Let me know.

PM sent

 

You have mail.

 

Thanks, Ill try this and log it and repost it.

 

I logged the data with the changes in the tune. At WOT it was reading 12.8-9take a look:

http://www.mediafire.com/file/jmjmjnyzfgi/731 396 lt1.csv

 

Ok first things first (before you log more), I need to send you a new file since whoever had it before did not apply the blm locker for wot. Silly me for assuming that everyone would do that. Also need to pull just a bit of timing out of it at wot because its a bit too aggressive in low rpm and is showing some knock and killing your power a bit. Also need a couple of other minor tweaks.

I take it you are happy with the changes to the kick down and the shift tables?

Your ported maf is going to make this a bit of a challenge but I think it will not take a whole lot.

I will send you a new file before you need to do any more logs. Oh and turn your time between logs down on freescan your motor picks up rpm too fast for the setting you have. Your laptop wont lag anymore while logging if you do that also.

Expect email soon.

 

New file sent.

 

WS6T3RR0R, I have noticed some of my files also suddenly show non-blm lock, I've been using the same base file for many moons now, somewhere somehow it gets unchecked.

Now before I final-save any tune I check for BLM lock, though Im in open loop and it doesnt apply, but still.. somethings up with it.

I would say in 07 and 08 I was hitting my tuning hard (a full year, all 2007 to 2008), some 150+ changes and at random it seemed the BLM lock would undo at some point. Tunercat and LT1_Edit.

 

Sorry WS6T3RR0R, individual cylinder fuel trims in his file are STOCK.

STOCK per GM.

Also, STOCK GM takes the Individual FUel Trims OUT above 14.8% TPS.

BOTH SETTINGS ARE STOCK FROM GM!!

I didnt check the rest of his settings but now I have a feeling alot of them are close to stock as well, not "jacked" in any way.


I call it as I see it, that info is plain wrong.

 

nope.