JakeFusion

iTrader: (7)

Glad to hear it!

joecar

But of course, as expected...

onefastgta

Just wondering if your table assumes fuel pressure at the rail is 58lbs? What to do if rail pressure is lower or not 58lbs?

NitroFumesAteMyBrain

Yes 58#, you would need to scale the ifr back

JakeFusion

iTrader: (7)

Yep. Exactly. Just scale according to pressure.

Johnny_B

Hey guys, I wonder if I could pick your brain for a few newbie questions.

I built a 09 Silverado with a 4.8- put a kb racing turbo kit on (76mm) i got the tuning school level 1 and 2 courses. With hp tuners.

I went with semiens deka 80's cause of the seemed
Cost and popularity, but she's hunting at idle, the LTFT aren't that bad (+- 4) but i can't get it to stop hunting at idle. I suspect it's because I don't have the injector data. I did calculate my inj flow rate and scale my 'injector flow rate vs KPA' table accordingly. But still I feel like I need the proper data.

Following this thread, I found your spread sheet, my question is the Column labels up across the top do not directly follow what the sheet says for short pulse adder?

Also I do have the stock returnless set up for now, how would i input the volt-KPA-pressure table data with the standard 58psi constant gm system?

These may be pretty basic questions, I apologize, I am still grasping a hold on the whole
Tuning process. Thank you so much for your time!



I

joecar

Post your tune file.

truckdoug

iTrader: (25)

i'm messing with a turbo set up using a denmah tune for a base

his minimum injector pw is .648 and min fuel milligrams is .029

the transient fuel mass (fuel boiling time vs ECT vs MAP in HP tuners) is roughly double of jake fusion's numbers.

so far tuning this truck is coming along pretty good. I'll give Jake's numbers a try and see what gives.

also, my FPR is not boost referenced

Johnny_B

I'll post in a few hours soon as I get home. I haven't tried jake's numbers yet. I guess my main concern was- will the data be the same for a gen 3 LS as a gen 4.

Johnny_B

here is my latest tune, I havent gotten far really, I also added my latest idle attempt, you will have a better idea of whats going on, im still learning how to read my charts. once i interpret this data, im really hoping it helps the hunting.

Johnny_B

ok, so because the values for the volts vs kpa vs pressure table were quite a bit different on my tables than the spread sheet, I tried some other data for the 80s that came to be at just the right time. The data comes from the good folks at tampa tuning.

It did take most of the hunting out of the idle, it was a lot smoother, but if you look at my log file, the timing was hunting a bit.

now I am not sure if the tampa tuning was ford data, because at the top it said something about ford injector. anyway, I will play with the maf calibration to get the LTFT better, because it was way out with the new data. I also still want to figure out how to input the data in this thread seeing as some of you guys had such good luck with it.

if anyone could chime in about what to do if your values are different than the values in the spread sheet, it would be great. Thanks guys!

I attached the data, my tune file with the data and my log, if your interested

Johnny_B

ok I tried the data from this thread, seemed to run very similar to the tampa data. I stuck with this data however, I played with the MAF calibration table (its in MAF only mode) to try and get the LTFTs a little better, I had some success, not sure how you guys do it, I did it all in park just idling, got it down to +-3 in park, but then I took it for a drive and the numbers were all over the place, like 27% in some instances.i attached both data logs and my current tune in case your interested. Also my WB02 was reading like 11, so somehow I need to set the commanded AFR, not sure how to do that yet, but I think my course will show me, once I get there. My next step is do some VE tuning. then more part throttle tests for further calibration.

joecar

The data is the same, it has to be interpolated to fit the different axis in the Gen IV tune file.

Johnny_B

Thanks joe, yeah that's kinda what I ended up doing. It seems to be idling pretty well now, the only real concern I have is it idles at 11-11.5 AFR. My fuel trims Are pretty good, so makes me think the Ecu is commanding such a rich condition, and I'm not sure how to fix it. I found the table that adjusts AFR at WOT but not for idle. Any ideas? I can post a current log and tune if you want

joecar

Post log/tune... someome/me will take a look, someone will see why.

Johnny_B

I just happened to find a recent thread, another guy posted, same problem as me and his injector data is exact same as mine. I posted my files there, here's a link, someone suggested adjust the 'minimum fuel milligrams' value, but being new, I was unable to find this table/ value. (I have hpt 3.0 btw) thanks again for your help man!
https://ls1tech.com/forums/pcm-diagn...dles-rich.html

Johnny_B

so I was looking at a hpt file of sloppy mechanic's that was in hpt version 2.2. I found the min fuel milligrams right away. problem being I have HPT 3.0 and its not in the same spot, or its not called the same thing. heres a screen shot, anyone know where to find the equivalent???

truckdoug

iTrader: (25)

go to
engine>fuel>general
scroll down center column, its directly under limits "min injector pulse"

Johnny_B

Is that the same value as the 'min fuel mg'? Would you value it similarly as well, .2 or .14 guys seem to say?

truckdoug

iTrader: (25)

no, that is under engine>transient>transient fuel qualifications>min fuel milligrams

i am using the denmah numbers (0.029) and it seems to jive with all the other denmah numbers for the deka 80s.