C. Ludwig

iTrader: (27)

This tip was brought up by Scott at Haltech in Australia. It will work with the older E8/11 as well, but the Platinum software makes the changes easier to implement. This will NOT work with the E6K/X because the load columns are not adjustable.

The key is to stack the load columns for pre and post secondary injection right on top of each other. Meaning, if the staging load is set to 2.0 psi, you will want load columns at 1.8 psi, 2.0 psi, and 2.2 psi. The transition will work much more smoothly with much less interpolation needing to be one by the ECU.

You'll also want to make sure the "staging bar injection time" map is setup correctly. This map is simply an extra load column located between the last primary only column and the first secondary column. It's actually fairly redundant since we've stacked the load columns so close together, but it should, none the less, have accurate values entered. A good place to start with this map is half way between the pulse width of the last primary column and the first secondary column.

Lastly, the fuel setup page has the box for "staging load". The value entered in this box needs to match the first secondary load column.

Follow these steps and you'll have a much easier time getting a smooth transition.

Fero313

iTrader: (1)

So if you have columns at 1.8, 2.0, and 2.2 psi... which value does the ecu use for the primary injectors for the rest of the row (primary hold mode)?

example:

staging load set at 2psi

______3500rpm
1.8psi 3.7ms
2.0psi 3.9ms
2.2psi 4.1ms
4.0psi ??

As you move through the rpm row (like on a dynodynamics with rpm locked), which cell is the last for the primaries? If it is 2.0psi... at 2.2 psi would that row be very low ms, possibly around 1-1.5ms?


***As my rpms rise, I notice that the primaries might level off for a bit then start to rise.

Once you are over the staging bar, and your rpms start to rise, does the primary hold value rise along the staging column??

I'd be willing to post my map as an example and even a log of what the injectors are doing.

C. Ludwig

iTrader: (27)

In the example in my first post, staging load is set at 2.0. That is a value that you enter in the fuel setup page. So that is the first load range where the secondaries begin to open. The last load range where the primaries would be operating by themselves would be 1.8. In primary hold mode the injector would hold at whatever the last pulse width before the secondaries came online, minus the dis-enrichment value set in the fuel setup page.

In the above example, the primary pulse width will follow what is programmed in the 1.8 column relative to rpm. So, if the secondaries come on line at 4000 rpm, the fuel curve for the primaries is probably still rising to the torque peak of around 6500 rpm. After 6500 rpm as the VE falls off the fuel curve should also fall off to maintain a common afr. As that happens, the primary on time will fall off as well. This is what data logs from engines I've tuned look like anyway.

The attachment below shows this. The scaling for the pulse width is greatly exaggerated to highlight the trend.

Fero313

iTrader: (1)

Makes sense now. If the RPMs were static, the injection time graph would always look like it does in the Platinum manual.... and any future changes to the 1.8 column will affect the overall injection time and subsequent fuel mixture of the cells to the right of it. Is that correct?


** A note to anyone who makes changes to the cell axes... ALWAYS add or delete columns... Do NOT just relabel the column value or all of those values will shift and screw up the map. **

gxl90rx7

iTrader: (1)

Chris can you take a look at my map? having a lot of trouble staging 550's and 1600's. There is a fairly bad lean hiccup when getting into boost, and a full rich hiccup coming back out. the rest of the fuel map is tuned pretty well, only problem left is staging