400 SBC Tune

[dave w]

Yes, the tune will be more precise. See attached data log pics.

dave w

[wtjoker]

nice, I guess I need to bust out my solder gun and attempt the home made cable..I was reading where the displacement was defined in the bin but I didnt find a reference unless it is called something completely different. I was trying to get some of the obvious snafu's.

[dave w]

nice, I guess I need to bust out my solder gun and attempt the home made cable..I was reading where the displacement was defined in the bin but I didnt find a reference unless it is called something completely different. I was trying to get some of the obvious snafu's.

The displacement is a calculated with the attached Base Pulse Width (BPW) spreadsheet. I tune using spreadsheets.

dave w

[wtjoker]

Awesome stuff...did you read the bin i attached, I also found a superchips that was in salvage yard 1227747 ecm that was entertaining to read, i attached it here lol btw- im almost done with this cable http://winaldl.joby.se/aldlcable.htm

[wtjoker]

Checking out your spreadsheet, it looks like I need to update this value from 135 to 156?
1 pound per hour = 0.125997881 grams per second

0.825 Cylinder Displacement
6.6 Engine Displacement in Liters
8 Number of Cylinders


156.8771504 BPW = 1461.5 x (cyl vol / inj flow rate )

7.685870741 Conversion lbs /hr to grams per second
61 Injector Flow in LBS / HR

Enter Displacement, Clinders, and Injector Flow Variables


400.jpg

[dave w]

Checking out your spreadsheet, it looks like I need to update this value from 135 to 156?

Correct.

I use the ALDL Cable from http://www.aldlcable.com/products/aldlobd1u.asp

dave w

[wtjoker]

Cool. I will run this change in and see what we do. Does the injector bias value need to be changed? it is set to .40

I have a ton of resisters, but I can't find any NPN transistors that are listed for this cable, guess ill have to go to the rat shack