Hey guys,

Im starting to really get my feet wet with this tuning stuff. Many of you have already been a huge help (95Blackhawk). But before I can start playing with the MAF tables, it looks like i have a pretty huge BLM split. The two fuel cells I really see this with are 16 and 18. Now i've taken the initiative to take some temperature readying on each cylinder.

At idle

Cylinder # Temp.
1 600-700 F
3 450-550
5 450-550
7 250-280

2 600-700 F
4 450-550
6 450-550
8 230-280

Its fairly difficult to get a good reading since the temp. fluctuates so much but there definately is a progressive decrease in temperature from the front to the back cylinders. Looking at the fuel trims that were programed by madz28 it does make sense since you would expect the rear cylinders to get less air then the front cylinders. I read on lt1pcmtuning.com that the middle cylinders should be the baseline for the other cylinders. I guess im hoping someone can chime in with some advice or experience with adjusting these tables and if the rear cylinders (7 & 8) are rich or just lacking in combustion. Here are the links to my Datamaster file and tunercat bin file. I appreciate anyone willing to help me out here. Thanks guys.

http://www.mediafire.com/?2znyjygq3gg

http://www.mediafire.com/?itzdizqwdac
*Note* I posed the incorrect .bin file. I will re-upload

Engine specs:

396 LT1
LT4 Intake
AFR 210 heads
Compression = 11.5:1
42 # injectors

Dyno runs

http://www.mediafire.com/?nyyctnm3wym

http://www.mediafire.com/?2tiygot3mld

Dyno viewing software Winpep7

http://www.mediafire.com/?gmumc3fmmtj

 

The split BLMS could be a result of a exhaust leak on the passenger side header. I will check that out tommarow.

I've also been doing alot of think about the individual fuel trim multipiers and how important having consistant cylinder temperatures is (especially at the dyno). For example if you take a look at my dyno runs you will see I was able to make 450 RW after my tune. This was at a very rich 12.2. Trying to lean out more than that resulted in a loss of power, BUT what if my cylinder temps were not consistant. The wideband is only able to capture the A/F on the entire bank. So if cylinders 2 and 8 are lean and rich but the middle cylinders are optimum you could still have a balanced A/F ratio even though cylinders 2 and 8 are not running ideally. If this were the case on both banks, you could potentially be leaving out an incredible amount horsepower. I think with this said, thoroughly tuning your specific application to such a degree is very important.