5.0 HCI Tuning

[ATPCR]

If curious of some facts as I follow this thread.
What are your cubic inches?
What is fuel injection poundage at what fuel pressure and return fuel or not?
What brand and MAF size are you using?

[red5.0fogger]

This is from the A9L2 write up on the homepage. I would just do these and see where you land. Also you should get the newest version of the A9L2 from the download page.

REQUIRED VALUES
The following are the absolute MINIMUM changes REQUIRED before starting your vehicle utilizing the A9L2 calibration. Be sure you input your variables IN THIS ORDER otherwise your values will be wrong! Before manually entering your injector data in your tune check to see if the template exists at the bottom of the tree view in tunerpro. If so simply click the patch to enable the injector data in your tune. NOTE that anytime you change the injector data in your tune you MUST update all values in your tune that have SP** most notably SARCHG and the MAF Transfer.

PID Variable Comment
1> K-Constant Global Fuel Modifier This scalar should always be set to 30 and never adjusted.
2> SP**AHISL Injector High Slope This is your actual injector data from the manufacturer.
3> SP**ALOSL Injector Low Slope Input your injector's manufacturer's data.
4> SP**FN389 Injector Breakpoint Input the injector manufacturer's recommended fuel breakpoint.
5> FN367 Injector Offset Input the manufacturer's recommended voltage offset values.
6> FN348 Crank PW ECT Modifier Multiply the Y-axis as a percentage of the stock 302 cubic inch engine and stock 19 lb/hr injectors values by doing, 19/(new injector size) * (new engine size)/302=0.xxx Apply that 0.xxx correction to the entire y axis.
7> SARCHG Cubic Inch Displacement Input your actual engine size
8> FN035A Perload Scaling Populate the Y-axis with your engines expected peak N/A load values (when not in boost). DO NOT PUT IN MAXIMUM LOAD VALUES WHILE IN BOOST. This can be left stock and updated as your tune is dialed in.
9> SP**FN036 MAF Transfer Input your actual MAF flow data from your flow sheet to begin tuning.
10> (Current) FN2200 Spark Table Populate this table with adequate values for your specific engine combination. Reference the spark write up and mbt chart for ideas.

Tuning
Obviously you still tune as you would otherwise the A9L2 is just to get you on your way much easier and faster. You are still required to dial in Fuel, Air, and Spark just as you would otherwise.

As with all decipha base tunes its imperative you read over the pre-tuning write up, the fuel write up, spark write up and the initial tune instructions. Also know that the post tune Instructions apply as well to all tunes.

Special thanks goes out to Derek Fenwick, a.k.a. "sailorbob" / "dex" for originally creating DIY tuning support for the open source community.

[auscob07]

red5.0fogger

Thanks for the reference. I studied this all carefully and followed all the instructions … except for whatever it was that I made a mess of. I’ll have another attempt shortly and will be sure to double check the results.

ATPCR

Details should be in my signature. I can’t check as I’m on a mobile right now. Otherwise it is a 302 with 24# injectors and a massflow (now pro M) MAF, which I understand to be a GM product. Fuel pressure is 55psi in a return system.

Cheers all

[ATPCR]

auscob07, I see. I want to plug in your numbers to see how far that I can get through Michael's method. Thanks.

[ATPCR]

@ auscob07 Is your fuel system returnless?
What do you have your global fuel constant set at?
Are you using straight pump gas (gasoline) for fuel?

[auscob07]

ATOCR

I have a return style fuel system with adjustable FPR. I run 95 or 98 octane pump fuel.

The tune I posted is corrupt (or more likely I messed something up) but the K constant in A9L2 should be 30.

I’ll have another go in the next week or so and see how I go.

[ATPCR]

I've been looking at it here and there. I saw your K constant at 30 and I see a cubic inch setting that someone else saw, 377 cubes.

[ATPCR]

I'm just now starting to learn this, so there will be a lot of questions. I computed your injector change, 19/24 x 302/302 and came out with .7917.
I just now multiplied the Y-axis of the cranking pw function as a percentage of the...Now what do I do with it? In TunerPro I'm looking at FN348.
Do I multiply each of the nine rows by .7917? And I ask this next question because I don't know. Do I work with each row individually or can the whole group be changed at once?
As I get into this, I realize that I may need to start with a new copy of Michael's bin file because I don't know what Davidson has changed.
Remember, I'm a newbie here. I'm approaching 2nd grade. I'm past pre-k and kindergarden.

[decipha]

tunerpro is not setup correctly

read the getting started write up

grab the right side of that function box with your mouse and drag it to the right to widen it so you can see the execute button

in the drop down menu that has offset currently selected next to function, click the down arrow and select multiplier from the drop down selection

in the value box next to it, type in 0.7917

then click the top of the y axis column that says msec, it will highlight the entire column

click execute and it will multiply all the values by .79

close that function box to save the new values

[ATPCR]

Ok. That makes a lot of sense now that I can see the "execute" button