Hey guys, I put the following information on LS1tech.com hoping I would get a response but I didn't receive much information. I'd appreciate it if any tuning experts could take a look at these logs. Here is the post from LS1tech: https://ls1tech.com/forums/lt1-lt4-m...og-review.html
For some reason I can't upload the files to ISSF which is why I posted this to LS1tech instead of here to begin with. If you go to the LS1tech site you should be able to download the files there.
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 decked 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 to 52mm. 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. This thing runs like a BEAST. 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. 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.