Hey guys, I recently installed a new engine in my 1994 Impala and did some data logging. Copies of the logs are attached. I would appreciate it if a few experts could take a look and let me know what you think. Here are the details on the engine:

388 cubic inches with Eagle forged crank and H beam rods. SRP flat top pistons with -5cc valve reliefs and 4 bolt splayed mains. Rings are gapped for nitrous use.
Heads are AFR 210's. They were cut a little bit to get the compression ratio to 11.67:1. The Cometic head gaskets with this setup resulted in a .039" quench.
The cam was spec'd by Lloyd Elliot - 231/243 duration on a 110 LSA with .571 / .597 intake/exhaust lift with 1.6 comp pro mag rockers.
The car has long tube headers, Accell 40lb injectors, an MSD billet opti, and an ATI Super Damper. It also has a Precision Industries 2600 stall and 3.73 gear.
The intake is an as-cast Edelbrock LT4. Throttle body is a GM stock unit which has been ported. I know a setup like this may need a 58mm but this car is set up for much more show rather than go and after reading about a lot of the problems people have with 58's I decided I am OK with sacrificing a little power in order to have fewer idle and drivability problems. The initial tune was mail order. I have been VERY impressed with the drivability, idle quality, and overall street manners with this tune so far, especially considering this is a large cam in my opinion for a heavy car with only a 2600 stall. However, I don't know how to look at the logs and determine if the tune is spot-on or not.

I also have a Nitrous Outlet plate kit and plan on using a 150 - 200 shot once the tuning is confirmed to be in line and I have more break-in miles on the engine. I would appreciate if any experts could review the logs and let me know what you think. Also, is there a way to look at the logs and determine if a 58mm throttle body would increase power without causing drivability issues? I know too much vacuum at WOT indicates a restriction in the intake tract but I don't see anything in the data log that points this out.

***2/2/19 edit: I logged using eehack today. I tried to post the data log here but I received a message saying it is not a supported file type. Can I email this to someone who can review it?

Thanks,
Paul

 

I forgot to add the car has an F-body mass air sensor (still has the screen in it) and the cats have been removed.

 

In reading other data log threads, I noticed most people upload .uni files. I'm new to Freescan and this was the first data log attempt I have made. Is the Excel format usable or do I need to run a new log? I don't recall seeing an option as to whether it was saved as a .csv file or .uni.

 

No one? Can someone at least confirm if the format of my data log file will work or if I need to do a new log?

 

For the vacuum at WOT, look at the map reading. It should be close to atmospheric at full throttle, dipping a little bit when you get up in rpm. Too big a drop means you have a restriction.
if it's closed loop, you can look at the fuel trims to determine if your fuel mixture is close.
I run open loop and use a wide band 02 sensor to tune.
I use eehack to log with. You might want to check it out. It's free.

 

To the top!

 

just .zip or .rar the log file(s), then you can upload them here

 

WOT zip file attached.

 

eehack file attached.

 

Looking at your WOT log, I don't see anything concerning. Both short and long term trims looked reasonable during your driving. I'm not sure what units the MAP is in...I'm used to seeing KPa units....might be volts. If it's running good with no codes...I'd say drive and enjoy it. =)

The only odd thing I see, with the data in general, is that the scanner appears to have two of the same lines of data for every frame taken. Might be a quirk of the scanner or how it was exported. I noticed it when I was marveling at how many updates a second that scanner was getting.

 

Great! Thanks for the feedback.