Turbo L59 03 z71 tahoe flex ss3 cam built 4l60 stall deka 80# injectors ls1 heads need help getting the tune lined up
Turbo L59 03 z71 tahoe flex ss3 cam built 4l60 stall deka 80# injectors ls1 heads need help getting the tune lined up
Last edited by json; 01-03-2024 at 10:04 AM.
It's running rich. Doesn't matter either way because the data is wrong. Post #26:
https://forum.hptuners.com/showthrea...pository/page2
Thank you i will try this I had some other data that came with the injector but it was scaled for 58psi this has far more data an helps with scaling.Originally Posted by SiriusC1024
when i enter the data in my short pulse it wont entry the right value, ive yet to go try it waitning on input on this
SPA looks fine. The only mistake you made is not using the 0kPa column values for the rest of the Offset table.
Careful with the WOT shift RPM's. Safe limit is 6000 on the 4L60E.
Tune with the narrowband fuel trims. Use wideband for PE.
sorry i dont think i understand,
Which part? The SPA (short pulse adder) or the rest? This is correct:
still starts rich 10afr tapering up to 12-13 ve is down to 7 at idle i had to change my transient min fuel to .010 for it to idle
sorry i get what you mean now after comparing files.
Something is way wrong if that's what it takes to idle. VE should never be that low. I would guess the injectors are much larger than 80 lbs. per hour.
If it were me trying to figure it out, without knowing the cam specs, I'd put that area of the VE back to stock, whack out 10-15% to account for a smallish cam, and then "back into" the IFR. Meaning, adjust your IFR until your AFR/trims come into line.
But best thing to do is shit can the injectors and buy some known good injectors with good data.
Last edited by edcmat-l1; 01-03-2024 at 09:52 AM.
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https://siemensdeka.com/product/80lb...scar-fi114991/ these are what i have, they are rated 80lbs @ 43.5 ive used this website before an have had many sets of these just stumped on this build.
ss3 cam specs
RPM range: 3000-7500
Intake duration (.050" lift): 238?
Exhaust duration (.050" lift): 242?
Lift: 0.590”/0.624”
LSA: 110.5?-113?
Something is majorly wrong if you have to lower the VE to unrealistic values for it to idle. Either the fuel pressure is through the roof or the injectors are much larger than 80#. Looks like most of the data is close enough and the transient has been lowered enough to be out of the way.
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it does idle but is rich at "normal" values, but with lower values like 7% it's at 12.5-13.2 afr I'll get manual gauge and check fuel pressure. Also, I have a 3-bar map also its new thought the old one was causing my issues but no changes idle but it.
12.5-13.2 AFR is too rich for idle. It should idle at stoich. If the fuel pressure is correct it almost has to be the injectors are bigger than 80#. Again, like I said before, you can pretty quickly figure it out by setting the VE back to stock -15% @ idle, and then adjust the IFR until your AFR is 14.5:1.
Put it back in closed loop and use your short-term trims to dial it in. Open loop tuning is dumb.
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Let me restate that. Put it back in closed loop. Leave the long-term trims off. Put your VE back to stock below 105 Kpa. Knock 15% out of the idle area. Then run it and see what the short-term trims do. Adjust your IFR until the STFTs are +/- 5%. See what your IFR is at that point. Completely ignore your wideband until you're ready to tune WOT. That's all it should be used for.
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What I noticed this morning was that LTFT's were populating, but the tune is set to OL. Those are latent fuel trims that haven't been cleared. If it was set to CL then the situation would work itself out.
I didn't look at the log until just now after reading your post. Both the LT and ST trims are working in that log. Still has the narrowbands pegged at 900 mv.
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It shows trims in the log, but CL is disabled in the tunes. Doesn't make sense.
Post the latest tune and a log running it.
This is a little out in left field, but I have seen a situation recently where an evap canister was full of fuel. The evap purge was sucking in so much raw fuel that the motor was richening up to the point of dying at idle with fuel trims maxed out. If you completely run out of normal things to check, disconnect your evap line from the intake and see if the problem changes.
current tune op loop good idle 14.7-15 afr.hpltahoe current.hpt
open loop is on still has 7 in idle at ve thinking my map is bad or something can see 20 kpa diffrent from log gauge an 3 bar channel
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