SD tuning starting point tune questions
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SD tuning starting point tune questions can someone that knows what they are doing looking over my starting point SD tune and make sure its not adding or taking away fuel still, because I feel like it still is.
Its a 98 Camaro Z28 I've changed shift points fans etc.. disabled what I understood I should and set the EQ ratio table and the PE table to command a 12.9 AFR I didn't change the VE tables at all or the target AFR. I only changed the Open loop EQ ratio and PE tables to command the 12.9 AFR. Am I doing this right?
I'm new to tuning an using Hpt 2.24.1170 and firmware 120 their newest update and I don't see where to disable STFT.
mods are; LTs, 3" ory with bullet dumped, K&N, lid, ported MAF, 3600Stall, 3.42's, Egr and air pump removed.
anyways plz take a look and thanks
Its a 98 Camaro Z28 I've changed shift points fans etc.. disabled what I understood I should and set the EQ ratio table and the PE table to command a 12.9 AFR I didn't change the VE tables at all or the target AFR. I only changed the Open loop EQ ratio and PE tables to command the 12.9 AFR. Am I doing this right?
I'm new to tuning an using Hpt 2.24.1170 and firmware 120 their newest update and I don't see where to disable STFT.
mods are; LTs, 3" ory with bullet dumped, K&N, lid, ported MAF, 3600Stall, 3.42's, Egr and air pump removed.
anyways plz take a look and thanks
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From: Ann Arbor, MI
I'm just a novice, but it looks OK to me.
Personally I would only change the "Open Loop EQ Ratio" table to your fixed "1.13" values in the temperature area where you are testing, e.g. 140-212, and leave the rest stock.
Open Loop means that STFT are disabled.
Since your Closed Loop enable temperature is 285, you should always be in Open Loop.
The "Power Enrichment - Add versus ECT" table is set, but zero in the 140-212F range and therefore should not affect your fueling.
Your MAF seems to be properly disabled.
Perhaps I missed a table, but you seem to be fully in SD mode.
What makes you think something is still adding/subtracting fuel?
Personally I would only change the "Open Loop EQ Ratio" table to your fixed "1.13" values in the temperature area where you are testing, e.g. 140-212, and leave the rest stock.
Open Loop means that STFT are disabled.
Since your Closed Loop enable temperature is 285, you should always be in Open Loop.
The "Power Enrichment - Add versus ECT" table is set, but zero in the 140-212F range and therefore should not affect your fueling.
Your MAF seems to be properly disabled.
Perhaps I missed a table, but you seem to be fully in SD mode.
What makes you think something is still adding/subtracting fuel?
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under very light throttle its really lean, like 16-19 lean so before I started making adjustments in these areas I wanted to make sure that things were right before I f'd things up cuz I was doing something wrong. I'm green to the tuning thing like light green lol
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Also since I noticed the lean condition I changed the spark tables back to stock values, still really lean after the change. I think the tune that was on the car when I started was a hypertech tune...
I also noticed the IAT at idle/low rpm was really high(normal I guess senor still above radiator) on my last log. I assume that is why its so lean in light throttle conditions?
what do I need to do to log and correct thing properly move my IAT senor?
I also noticed the IAT at idle/low rpm was really high(normal I guess senor still above radiator) on my last log. I assume that is why its so lean in light throttle conditions?
what do I need to do to log and correct thing properly move my IAT senor?
Make sure your injector values are correct. Get your Iat where you want it before you ever start tuning it. I put mine in the intake on my truck intake. Right where the Evap would go. Start with the stock timing table and then start dialing in your VE.
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From: Ann Arbor, MI
The injector tables are stock for a '98 LS1.
As suggested above, ignore any logging when your IAT is heat soaked. Only tune with accurate IAT values.
Is your K&N filter dry or oiled?
No idea if true or rumor, but I have read that an oiled filter can throw off the MAF.
As suggested above, ignore any logging when your IAT is heat soaked. Only tune with accurate IAT values.
Is your K&N filter dry or oiled?
No idea if true or rumor, but I have read that an oiled filter can throw off the MAF.
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I never oiled it but I think they come pre-oiled. And I would says that's ture becuz the oil would dirty up the resistor and that will make it inaccurate.the maf is clean tho just cleaned it not long ago not that it really matters at this point in time I'm not logging it to keep down on bytes, I'll come back to that after the VE table is adjusted
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From: Ann Arbor, MI
Might the wideband be reading incorrectly?
I like to log the wideband AFR and the stock O2 sensor voltages. If the wideband reads 14.7 (really 1.0 lambda) when the stock O2 voltage is near .500V, you can be sure the wideband is accurate; well at least near 1.0 lambda).
Why not post a log file here with the commanded AFR, the wideband AFR, the stock O2 sensor voltages, the MAF values and the other typical parameters.
I like to log the wideband AFR and the stock O2 sensor voltages. If the wideband reads 14.7 (really 1.0 lambda) when the stock O2 voltage is near .500V, you can be sure the wideband is accurate; well at least near 1.0 lambda).
Why not post a log file here with the commanded AFR, the wideband AFR, the stock O2 sensor voltages, the MAF values and the other typical parameters.
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Ok just so I getting good info to post to be reveiwed are u wanting me to log in OL or CL to see if it's near 500mv @14.7? Also My wideband is in my LT header O2 bung and im utilizing the narrowband sim from the wideband will that make a difference in the 500mv@14.7 on that bank?
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From: Ann Arbor, MI
Ok just so I getting good info to post to be reveiwed are u wanting me to log in OL or CL to see if it's near 500mv @14.7? Also My wideband is in my LT header O2 bung and im utilizing the narrowband sim from the wideband will that make a difference in the 500mv@14.7 on that bank?
See also this thread:
https://ls1tech.com/forums/pcm-diagn...ly-richer.html
And Jimmy's post in #21 concerning the oscillating O2 sensors.