well for the past few months i have been reading on here and various other sites and it has helped me tremendously. iv been tuning on my truck for the past month or so and here is where im at. Iv mainly done minor changes to get it running pretty smooth. i have logged my VE tables and had them around 128 +/- 2 and was able to get it to start and idle pretty good. when its at operating temp while sitting at a stop light it will either almost stall or stall. i read about changing the IAC steps vs coolant temp and lowered the steps to 10 at operating temp and that seemed to help. idle gets a bit low but no where near like before and it only does this out of park, in park it idles where i told it to in the idle vs coolant temp. any insight on this?

Now the real reason im in here is i have a question about SA. iv read the SA logic in the Prom tuning guide book on here for the 7747 but im still a bit confused. to my understanding the best way to tune SA and to keep adding timing until it knocks then back the timing off. Is this correct? i added a few degrees across the board and still no knocks and i really dont feel like hurting my motor. so any help would be great.

my goal is to get it as efficient as i can for daily driving and maybe have another chip for at the drag strip and if possible have an all in one chip. Iv got decent power with it but no where near what the truck should have. an example would be it can barely spin the one tire on a hard take off and it also slightly bogs a bit to around the 2000 rpm range. Also that got better with me lowering the AE vs differential tps/map but there is still a slight bog at times.

about my truck
91 s10 with new L31 vortec 5.7 with stock cam. i assume its around 300hp with the headers and performer RPM intake with minor TB mods such as smoothing it out for better air flow
regular TBI, not the 454, with i think 61# injectors at 11 psi last i checked. i would like to do the PromID hack to read the injector PW but cant figure out how to edit it. i tried the hex editor but cant find the locations of the values to change.
not sure if it matters but the truck weighs around 2700lbs
also im using the 7747 computer with winaldl to log and tunerpro to edit the bin

I also tried using a few different timing tables for use with vortec heads and im currently running what the motor seems to like the most. the table is from a bruce_65.bin i found.

Sorry if i left any information out and should i post my bin up and the xdf im using?

 

The closer the timing the lower the MAP. Modify your timing in each cell so as to move towards lower MAP. If MAP starts to increase then go back to previous SA.

 

Increase the idle rpm for the drive vs coolant table. Or open up IAC at idle(20 steps?) so Drive rpm is what you want and decrease the park table rpms.

Lean or rich bog? Lets assume rich bog as lean would possibly see a pop out intake. WB is invaluable here. Reduce AE at that RPM and witness what MAP value you are at and possibly reduce that AE MAP . I woud only do one at a time.

 

what is the best way to do this? i noticed in the winaldl LOG file that the rpm is not actual rpm, just a triple digit number or am i missing something?

The IAC was originally at 25 steps for idle and it would slowly stall, i lowered it to 10 steps and the idle goes down but has not stalled. should i lower it more or raise it some? Or is it something i have to play with?

Has anyone had any experience with the Innovate MTX-L? im thinking about buying it pretty soon to get better data logs.

Also thanks for your reply's!

 

Idle speed is coolant based. At idle at 190F my IAC steps are 10. At idle you can adjust the steps by moving the TSS. I used to be at zero but if it cannot close futher it cannot control higher idle speed should it occur. So I was happy with 10.

If you are stalling then you may want to look at stall saver settings. I believe them to be RPM adders should engine fall beneath a certain RPM. I you fall below say 600(?) then it adds RPM. I think mine add 60 rpms at 600 rpms. I idle at 750 rpms w/ manual trans.

Or there may be mechanical issues? Try to capture stall with a datalog. Your PW may be falling under 1 millisec. I am at 1.9 msec PW with a A/F at about 14.5/1. 350 cid

 

Let's say you are cruising at 2000rpm on a flat road. Make note of the MAP this is occurring at. Now add a couple of degrees timing in and around that cell.
Cruise same rpm, same road. What's the MAP now? If its lower, then add some more timing. If its higher then reduce the timing

 

Sounds good. I really appreciate the help. I'm currently at the hot rod reunion till Saturday and didnt bring the truck so the tune will have to wait.

Iv searched and searched but it keeps bringing me back to the same couple articles and they don't help me out to much as in it confuses me. I would like to change the prom I'd to the injector pulse width. How is this done, hex editor, or hand editing in something like notepad? If tried the hex editor in tunerpro and can't font the addresses it says to change. I'm pretty sure the article was for a 7747 but it still stumped me.

Also I have looked some but have not found a definitive answer. Can I copy parameters from one 7747 xdf to another 7747 xdf or could that change how everything is calculated. Another thing, if the parameter is not there is it simply not used by the computer, example, can I delete all the egr parameters and not affect anything if they are disabled to begin with? Sorry if this don't make sense, it's been a long day and it's on my phone.

 

thank you guys for you help with getting me out of my rut!! after more researching i finally found an article on how to read the the HEX locations and with that i was able to output the pulse width to the prom id so woohoo! After some math formulas i was able to determine the injectors are doing great with the current setup and lower RPM's havnt tried the higher RPM's yet. Also i made another break through and decided to open the WinALDL log file in Excel and it actually made sense, now i can compare log files to see the map reading when i change the timing. I also tried copying parameters from another xdf into the one im using to add the idle save but it seems now after i added that, my idle does not drop low enough to trigger it, but im not complaining. I also still have the bog when i punch the gas but i plan on buying a wideband o2 soon to figure that out. Once again thank you so much guys! Also is there a method to comparing the map values? or should i drive the exact same stretch of road using the same throttle variations? i currently try to match the rpm then look at the map to see the difference between the 2 log files. Is there a simpler way or is this just the meticulous part of tuning?