Engine bored to 8.1 L 9.5/1 compression, 36lb/hr injectors
Attachment 133467Attachment 133468
Sorry, BBC, not CBB.
Hesitation about 3/4 way through log, can see LTFT flatline at -18, about 1500-2000 RPM sets rich codes for both banks and CEL.
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Engine bored to 8.1 L 9.5/1 compression, 36lb/hr injectors
Attachment 133467Attachment 133468
Sorry, BBC, not CBB.
Hesitation about 3/4 way through log, can see LTFT flatline at -18, about 1500-2000 RPM sets rich codes for both banks and CEL.
Tell you what. I'll work on it get it going perfect. I'll let you decide if you feel like it's worth it.
Works for me, I just hadn't gotten any reply. Thanks!
Open VCM Scanner then connect it. Vehicle Controls and Special Functions>Fuel> clear fuel trims and LTFT's
Cycle ignition.
Open VCM Editor. Write this tune.
Get a log. Add the Injector Duty Cycle channel. Try to do deliberate slow rate pedal movements. Populate as many STFT cells as possible.
I don't see that channel. I looked under 'engine' , 'fuel'. The only thing I see that may equate is the pulsewidth?Quote:
Originally Posted by SiriusC1024
I loaded that tune and it started, but seemed to run really rich and the idle was surging quite a bit. Is this expected? Almost stalling out.
Yes it's expected. Do you have a log?
ok, no. I didn't drive it yet because of the surging and rich smell. I wanted to make sure it was expected.. I will try to grab a log tomorrow morning/afternoon. Thank you.
Well try it parked first. It'll be worth something to give a good baseline. Try to cover all the STFT cells you can thoroughly.
ok, should I warm it up with a cleaner tune, then clear Fuel Trims and upload this tune then go through throttle transitions? Should I do some in gear?Quote:
Originally Posted by SiriusC1024
Yeah do it warmed up, cleared fuel trims, smooth throttle movements. If you can get into gears then do so. What do you mean cleaner tune? Use the one I posted. Don't worry it'll get there.
Ok, warmed it up, cleared LTFTs (I think, the button didn't seem to do much...) then loaded your tune and ran to collect log. I chickened out about 4,000RPMs, but got a couple to 4,800RPM once or twice. Did with even slow throttle, then tried to populate more of the grid by making quicker throttle, etc. Here's the log.Quote:
Originally Posted by SiriusC1024
Alright run this one. Interesting to note you said it smelled rich. Log shows lean. Try to go for a drive. The longer the drive the more accurate the data. Same deal clear fuel trims.
Add Injector Pulsewidth and Cylinder Air Mass to the log. You have to be connected to add those channels. Maybe that's why you didn't see it before.
I will be out of town till Tuesday, so may not get the log till then, but I'll try to at least get it set up properly before I leave. When it smelled rich, it was right when I started it cold, and I only ran it for like 10 seconds... Probably just startup and surge that made it like that.... I had shut it off almost right away till I could verify that it was supposed to do that. Thanks.Quote:
Originally Posted by SiriusC1024
Quote:
Originally Posted by oldpartsnrust
Alright really nice job on the log! That kind of thorough data that makes this a lot easier.
Do another with this tune applied. Grab even more cells. Drive it longer duration and run it up a little more in the RPMs.
See if you can get cylinder air mass and knock into there, too.
Remove mass airflow.
Just a reminder, clear LTFT's and fuel trims with Vehicle Controls & Special Functions before logging.
This time it'll have to wait till I get back on Tuesday. I'll post it here when I can collect it. Thanks!Quote:
Originally Posted by SiriusC1024
That's ok no rush.
Ok, so what was done in the first tune that caused fhe surging fill the feedback from closed loop started? Was that disabling a ecm datapoint or something to get a clean deading on something else?
Running SD mode and disabling the MAF. SD fueling tables were off. That's what we're adjusting. Idle should clear up as they accurize.
Ah, ok. Without the MAF it does the surging.
So do you adjust the numbers till you get close to 0 when the cells populate? And what numbers are you adjusting? If offline instruction is required that's fine with me
Correct get fuel trims within 5% or better. I'm adjusting the VE table.
Ugh speaking of. I didn't transfer the primary ve to secondary. Secondary is used when in SD mode.
Here you go. Use this instead of #3.
ok, tune loaded, trims cleared. Now I need some time to drive it. Hopefully tomorrow I can get a good log.
Here's log for tune 4! I just put this back together after it spun 4 rod bearings so I am terrified to wring it out just yet. I did get it to over 5000 though.Quote:
Originally Posted by oldpartsnrust
Attachment 133937
Right. Keep an eye on the oil pressure.
It'd be nice to get the upper RPM range. What are you looking at for redline? Cutoff is set to 5350. WOT shifts 5250.
Hoping this should be the last one for SD portion.
I am changing the oil tonight too and will be taking this on a bit longer drive tomorrow afternoon... Probably 60 miles or so. That may give another good log. I think I originally had it so it WOT shifted at 5000 / cutoff at 5000. My tach reads a little high and I was buggin when I saw it swing past 5200 (on the tach)! It seemed to get legs at 4500 and up! NOPE, I'm chicken. Just want to tow reliably not drag. :)Quote:
Originally Posted by SiriusC1024
Alright I backed it down to WOT shift 5000. Cutoff 5100.
Buggin xD
I know it's a touchy subject for a lot of people, but I recommend either Quaker State 5w-30 Full Synthetic or Mobil 1 0w-40 Euro FS. ACDelco or Mobil 1 filter. Those two oils are the best on the shelf at Walmart by far. Unless you're running Amsoil then nvm.
The guy who did the machine work had me get extra clearance bearings and running Rotella 15w-40 diesel oil. When it first starts the oil pressure is about 60+ PSI at idle and gradually creeps down to about 20 PSI (maybe 18) when fully warm, HOT idling in gear with the AC on. As soon as I goose the throttle it jumps to like 50 PSI. That WOT 5200 seemed to be about 50 or 60 PSI of pressure. I am still in the dino oil break-in phase and that was the second oil change and it had some of the ultra fine grey metal coloring to it still.... Everything sounds OK so far, but the roller rockers are a little noisy. I got some extra valve covers which I am going to cut off the top above the adjustment nuts and do a running valve adjustment to see if I can quiet them down some. I drove it to the machine shop guy to see if the noise level was concerning and he mentioned it may be the injectors as well as the roller rockers adding to the overall noise level. He also said "ain't nothing in there gonna chew anything up, RUN IT." so that was good to hear! Hope to get a long log today as I got some running around to do. Thanks!Quote:
Originally Posted by SiriusC1024
ok, log... is there any sign of knock? I calculated the compression at 9.5:1 during machining and parts selection. I run 92 octane or better to try to avoid it.Quote:
Originally Posted by oldpartsnrust
Attachment 133971
Power just came back after a big storm. Went out last Thursday.
Run this tune. You'll have to start logging Mass Airflow Sensor [Hz] in order to continue.
Oh yeah, buy a can of MAF cleaner and use it. Don't want airflow calcs based on a dirty sensor.
Wow, glad you got your power back. Hope it was just an inconvenience rather than losing food, pets, etc.. Will do. One summer we lost power and I lost a whole tank of large cold water fish as we had no A/C.Quote:
Originally Posted by SiriusC1024
I added the MAF Hz to the logging and hope to get a log tomorrow. I ordered cleaner but it won't be here for a couple days. The sensor is pretty new as it is so I don't think it will be a bad log.Quote:
Originally Posted by oldpartsnrust
Alright cool. Looking forward to it.
I was thinking of taking this in for inspection so I can be gathering logs legally. Will this last tune be clean enough for a "safety test drive"? Or can I get one that will just drive normally for the safety technician? Thanks!
Should be good enough for inspection. If you get a CEL it's likely fuel-trim related due to the MAF not being tuned all the way. Don't know how close your MAF is yet.
Great, thanks. I didn't get a chance to do a log today, but should tomorrow.
I got a little bit of a log today. Let me know if this works?Quote:
Originally Posted by oldpartsnrust
Ok here's the tune to log.
One big thing to keep in mind is to keep it under 90% throttle. Shoot for 75%. Have to keep it out of PE. You can still run up the RPM's like I need if you lock it into 1st or 2nd gear.
These logs don't have to take as much time as when doing the VE tables. The MAF curve is a lot simpler than the VE table. You can cut the drive down to about 5 minutes if you want. Still have to cover a broad range, though.
Btw looks like I skipped tune 6 in the numbering order. Oh well.
I think the 5 with the 5000 RPM cutoff is technically the 6th? It won't stay in 1st gear even with the selector in 1st., but it stays in 2nd pretty good. Towards the latter half of the log I got up near 4K RPM at like 50% throttle. I did notice a slight hesitation / stumble at like 5-10% throttle until like 1000 RPM. Not a big deal, but don't know if it is significant.Quote:
Originally Posted by SiriusC1024
Thanks!
Attachment 134307
That hesitation is because it was running too rich. You did a good job getting this log because the upper section of the MAF curve is what I needed, hence my request to not go full pedal. That section is where the hesitation occurred.
You're making this a nice tuning experience. Thank you.
Here's 9. Getting pretty close and about done.