epfatboy

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This should be a quick one, I'm a newb so please take pity and use small words, the Engine in question is a 4.8 and has a cam, injectors and will have turbo by end of winter. I got it tuned enough to start and idle on a stand a few months ago by using a pressurized injector cleaner which on the video looks to have about 50+psi of fuel pressure. Finally got around to stabbing it into the engine bay with my 4L80E. It starts but dies, I was only running 45#'s of fuel pressure which I'm hoping is the problem.

Any thoughts?

I'd turn up the pressure and check but I just dropped off the drive shaft and don't have a yoke to keep it from leaking which by the way I was filling the tranny without the yoke and it started to hemorrhage after about 7-7.5 quarts. I guess I never filled a tranny before with out the shaft in it, kinda caught me by surprise!

I guess one more question, could there have been drag from the tranny which caused it to stall? Everything I know says that ain't it but I thought I'd ask...

Evidence..
https://photos.app.goo.gl/CGoS1hehVFczMmQZ9

G Atsma

Vats??

epfatboy

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Vats were dumped prior to first startup. I increased the fuel pressure to 55# and it started and idled for a little while then died again, it did however sound much better while it was running. Here is the tune/log I had in it when it would idle on the stand. Once I get my drive shaft back I'll see if I can log whats going on and post that up.

epfatboy

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G Atsma

Boom! What did you do?

epfatboy

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epfatboy

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Okay so I did a ton of reading, made some inj adjustments based on the Banish's info and my idle still surges. The engine is in the truck but I have not plumbed and exhaust or the cooling system so I only run it for like 45-60 seconds. It's also friggin cold outside. Desired idle is high right now as well until I get a better ball park idle. I'm really just learning all this stuff so I'm sure I'm not logging the right stuff either but I'm hoping for a little help and I willing to learn<br /><br />Here is the log file, what jumps out is the advance to RPM correlation. What I don't know is if the advance is causing the RPM drop or if the RPM is messing with the advance and then what is cause? If someone has a little time and can steer me in the right direction I'd appreciate it.<br /><br />

epfatboy

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I guess I should mention I thought the idle was straightened out but not really. I think the initial fire is good, subsequent (word of the day) fluctuate.... but I can't nail that pattern down.

I'm starting to think I should get the cooling system set up and then get an O2 in it before I go much further.

Luke19901

do you by chance have a 2 bar MAP sensor fitted as your log shows a barometric pressure or (key on engine off MAP) of 54KPA. It'll never run properly like that

epfatboy

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Suncc49

there are some good youtube tutorials on 2 bar o/s conversion.... when you convert over you will have to manually copy your old VE or adjust as needed

be sure to change the offset and linear for the map sensor recommend settings.... depending on your location the baro should read like 101kpa

epfatboy

iTrader: (3)

I had it idling pretty good and then went ahead with the 2 bar conversion. Was pretty confident I was going to start from 0 again but I needed to do it so..

Used the recommended 2 step process of writing the full virgin 2 bar tune then wrote calibration after I made basic VE/MAP changes
For the VE changes, copy/pasted in every 10kpa of orig up to 100, then used my values at 100kpa, added 25% to them and pasted it into the 210 line, interpolated vertical values to get a starting point.
Got the 2 bar settings from Sloppy site and pulled 3.5 out of the offset ( from 9 to 5.5) to get it to 101kpa which is what I needed to see.
https://sites.google.com/site/sloppy...identification
thought it was odd that a 2 bar map has a 207.66 linear kpa but I went ahead and used it....

As I thought.... it won't idle again but at least the work I'm going to do will be with the right 2 bar map. While I was out there I added and subtracted idle air, adding helped a little bit but nothing exciting, I think the idle air values I have are too high based on other similar tunes I have seen. Subtracting from the idle air wouldn't even let it fire for any time at all. Wonder if the MAF calibration values I have are too high? I'm thinking about reverting the spark and MAF values to the stock values and see how far it gets me.

Oh and another weird thing, a bunch of channels are greyed out and not capturing values on the logger, even stuff like injector flow rate? Can't even add them back, whats up with that?

Added the latest tune/log if someone cares to take a look. And thanks again for catching the 2 bar map miss on my part, feeling kinda stupid..

epfatboy

iTrader: (3)

Went back to stock idle air, spark and maf, no dice. Fires and dies.
Added 10% to maf calibration since I have no airbox or filter, no better
Added 10% to Idle air no better

Then I did a weird thing,
unplugged MAF, little better, still **** but a small improvement
unplugged IAC, little better again would actually stay running but not good

Exhaust smells rich for each attempt

Can the VE tables be the problem? They are stock interpolated to 2 bar from 0 to 100 KPA


The included tune is using the injector info from the stickie above, same thing happens with the Banish inj info.


What about the MAP linear and offset? I took those from sloppy and tweeked the offset till I saw the right baro at key on.

epfatboy

iTrader: (3)

Back to idling!

From Stock I went with
- Banish Injector data for SD 80's
- MAP linear and offset to 200/8.33
- MAF Calibration copied from Sloppy colorado build
- VE , Multiplied the 400 800 and 1200 columns by .6, .8, and .9
Fired right up.

Then pulled 10% from Idle Air to see if it got better, nothing to note

Tune and the log enclosed.
Hope Santa brings hot side for turbo so I can add the O2's and a WB.

Luke19901

zero out stall aver.

it will be a pain and make you chase your tail

epfatboy

iTrader: (3)

Is that the Stall Saver tables in the IDLE --> RPM tab?

Luke19901

yes it is

epfatboy

iTrader: (3)