As I get a lot of questions on its use, thought I would make a little tutorial. Standard useage rules apply, use at own risk. Myself or hpt will not be held responsible for any damage resulting from its use.
This is not a tutorial on how to build a complete tune, this is simply a demonstration of how to use and apply timing calculator. I am using a 2005 LLY file for this that is totaly stock. The numbers are not meant to represent what you should get, just data to use as an example. Timing is applied to all other models in the same fashion.
For most, a 50/50 calculation will be enough of a economy/performance increase that you will be happy with it. I will show at the end how to tailor the table a little more.
First, you want to make any modifications to your tune you are going to do, the timing calculator is the last thing you do as it is dependant on fuel and fuel pressure. Then download (click here) and open it(you must have excel for this). You must also have hptuners and your diesel tune file open.
1. Copy your fuel rail pressure table from here
2.Paste fuel rail pressure here
3. Copy Injector Pulsewidth here
4. Paste Injector Pulsewidth here
5. Copy Base Injector Timing here
6. Paste Base Injector Timing here
7.This shows the amount fuel being injected before tdc with your stock tune.
8.This is the very top table in the calculator(light purple). This is what you want to take and copy back to the same table you copied out from.
9.If you wanted to check that the calculator is doing what it is supposed to, take the table from step 8 and copy into the table from step 6. This is what you should see(not required, just a demo to show what is going on)
10.The area in green is the area the calculator modifies the timing in. The area in purple is left stock. You want the area in purple to stay the same for each table. So, either copy each timing table into the calculator and back to its appropriate table OR just copy the green area and paste that area into each table.
The following highlighted (pink) are the the tables for each engine you need to modify.
LB7
LLY
LBZ
LMM
The timing calculator does not have an advance limiter. The rule of thumb is not to excede 30 degrees. You will have to manually limit the table if you excede this value below what you are reving to. If it hits these values past your redline(stock is 3250) dont worry about it.
If a 50/50 timing table is what you want to achieve, you are now done.