TH350 Tuning
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From: St.Louis, MO
TH350 Tuning I did a search and found very little on this. 
Most people say I need to reflash my PCM to a M6 program and start all over with my tuning (my car is tuned for the C1 cam as it sits now). However, one person said they just deleted all the A4 codes.
If anyone has had any luck with the second method I am wondering which codes you deleted or turned off and also if there are any other changes that need to be made.
Thanks,
Derrick
P.S. I am using LS1Edit.
Most people say I need to reflash my PCM to a M6 program and start all over with my tuning (my car is tuned for the C1 cam as it sits now). However, one person said they just deleted all the A4 codes.If anyone has had any luck with the second method I am wondering which codes you deleted or turned off and also if there are any other changes that need to be made.
Thanks,
Derrick
P.S. I am using LS1Edit.
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Nope, it has always been a TH350.
I am still going to use my stock VSS. I bought the optional tailshaft that has a provision for the stock VSS. Will I still need to disable that code?
Surely there is more than one code to disable. Come on people, several members have asked this exact same question and none of you have replied to any of them.
With all the TH350's and TH400's out there many of you have to know this. Is it top secret info or something? 
Originally Posted by dhdenney
In LS1 Edit there is an option to disable the "diagnostic test" for no VSS signal-A4.
Surely there is more than one code to disable. Come on people, several members have asked this exact same question and none of you have replied to any of them.
With all the TH350's and TH400's out there many of you have to know this. Is it top secret info or something? Oh, well that changes stuff then. If you have are able to use the stock VSS then I would think you are good to go. There's one more code that I see in the tuner program and that's "transmission slipping-A4 only" so I guess disable the diagnostic test for that one and that should be it.
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Where is this "transmission slipping A4 only" code located? Is it in the Trans Diagnostics section? If so, I turned off every single one of those codes.
Here's what I have done so far. I have gone into the Transmission Diagnositcs section and turned ALL codes to OFF. I have also set the PRNDL Equipped to False. Should I have done these things? I'm not sure what the latter one will accomplish.
Anyone? Anyone?
Here's what I have done so far. I have gone into the Transmission Diagnositcs section and turned ALL codes to OFF. I have also set the PRNDL Equipped to False. Should I have done these things? I'm not sure what the latter one will accomplish.
Anyone? Anyone?
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From: Lake Zurich, IL
https://ls1tech.com/forums/showthrea...t=TH350+Tuning
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
From them sounds like all that needs to be done is Delete the A4 codes.... so just go into the DTC section and mark them to disabled
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
From them sounds like all that needs to be done is Delete the A4 codes.... so just go into the DTC section and mark them to disabled
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From: St.Louis, MO
Originally Posted by horist
https://ls1tech.com/forums/showthrea...t=TH350+Tuning
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
From them sounds like all that needs to be done is Delete the A4 codes.... so just go into the DTC section and mark them to disabled
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
https://ls1tech.com/forums/showthrea...TH350+swap+PCM
From them sounds like all that needs to be done is Delete the A4 codes.... so just go into the DTC section and mark them to disabled
I have heard that by deleting the A4 codes the PCM will think the car is in Neutral all the time. Can this be a problem? I think someone said the timing advance will be way low.
Also, anyone know anything about the PRNDL option set at False or Off?
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Verdad Gallardo TECH Senior Member
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From: Lake Zurich, IL
Originally Posted by PewterZ28
I have heard that by deleting the A4 codes the PCM will think the car is in Neutral all the time. Can this be a problem? I think someone said the timing advance will be way low.
Also, anyone know anything about the PRNDL option set at False or Off?
Also, anyone know anything about the PRNDL option set at False or Off?
It shouldn't matter as far as the trans is concerned... manual shifting, vacuum modulated
but I could see an issue if it was in gear, maybe still letting you start the car? hmmm
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I finally got it figured out thanks to Flame Throwing SS. Thanks again, you da man! 
He said to just turn off all of the DTC's and he added, "The tables you will need to use will be the park/neutral tables. The reason for this is because the ECM will not know when/if the car is in drive or park (much like manuals). GM tuned the park/neutral parameters lower on autos as a safety precaution. There aren't many table like this, but the rev limiter is one and some spark table modifiers as well. Fueling tables won't be affected by this."
Floyd, my car is still in the shop because of stupid cross member problems. The cross member kit I purchased doesn't even fit so Joe (Performance by Joe) had to fab a piece himself. I wanted to get the program written up now so when I do get the car back I will only have to make changes to the MAF tables for part throttle and then the PE vs. RPM table for WOT. I have turned off all of the transmission codes including the PRNDL option. I have also bumped up the idle and the rev limiter and turned off the TCC lock up options just in case. I still have to bump up the park/neutral timing table which I can copy and paste from my high octane spark advance table (at least I hope I can copy and paste otherwise I'll be doing a lot of number transfering). I also have to scale the injector tables for SVO 30lb injectors. I actually do not know how to do that portion but Big Shawn claims he does.
So I should be close with this new program and I'll just have to monitor my LTFT's and make changes if necessary. Then it's off to the dyno for WOT tuning.
He said to just turn off all of the DTC's and he added, "The tables you will need to use will be the park/neutral tables. The reason for this is because the ECM will not know when/if the car is in drive or park (much like manuals). GM tuned the park/neutral parameters lower on autos as a safety precaution. There aren't many table like this, but the rev limiter is one and some spark table modifiers as well. Fueling tables won't be affected by this."
Floyd, my car is still in the shop because of stupid cross member problems. The cross member kit I purchased doesn't even fit so Joe (Performance by Joe) had to fab a piece himself. I wanted to get the program written up now so when I do get the car back I will only have to make changes to the MAF tables for part throttle and then the PE vs. RPM table for WOT. I have turned off all of the transmission codes including the PRNDL option. I have also bumped up the idle and the rev limiter and turned off the TCC lock up options just in case. I still have to bump up the park/neutral timing table which I can copy and paste from my high octane spark advance table (at least I hope I can copy and paste otherwise I'll be doing a lot of number transfering). I also have to scale the injector tables for SVO 30lb injectors. I actually do not know how to do that portion but Big Shawn claims he does.
So I should be close with this new program and I'll just have to monitor my LTFT's and make changes if necessary. Then it's off to the dyno for WOT tuning.
Last edited by PewterZ28; Jun 1, 2005 at 03:13 PM.
Glad it is coming together Derrick. 
As for the PRNDL being true or false ... set it to false. OE it is also set as false, from my experience only the trucks have it set as true. I think it has to do with the PRNDL switch being mounted directly onto the transmission selector lever. On our cars it is mounted on the shifter assembly, I would have to verify the main reason why our cars do not use that feature.
As for the PRNDL being true or false ... set it to false. OE it is also set as false, from my experience only the trucks have it set as true. I think it has to do with the PRNDL switch being mounted directly onto the transmission selector lever. On our cars it is mounted on the shifter assembly, I would have to verify the main reason why our cars do not use that feature. Thread Starter
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I ran into a snag last night. The "base timing in park" table only goes up to 4800 rpm. Also, instead of every 200 rpm, like in the high octane timing table, the columns are every 400 rpm. Any ideas on what I should do here?
I can't remember off the top of my head where OE is located. Is that in the Engine or Transmission section of LS1Edit.
Sorry for all the questions, thanks again!
Derrick
Originally Posted by Flame Throwing SS
Glad it is coming together Derrick. As for the PRNDL being true or false ... set it to false. OE it is also set as false, from my experience only the trucks have it set as true. I think it has to do with the PRNDL switch being mounted directly onto the transmission selector lever. On our cars it is mounted on the shifter assembly, I would have to verify the main reason why our cars do not use that feature.
As for the PRNDL being true or false ... set it to false. OE it is also set as false, from my experience only the trucks have it set as true. I think it has to do with the PRNDL switch being mounted directly onto the transmission selector lever. On our cars it is mounted on the shifter assembly, I would have to verify the main reason why our cars do not use that feature.Sorry for all the questions, thanks again!
Derrick
Derrick,
I just looked at my Z28's BIN file. We did not alter the base timing table, both the drive and park tables are as you describe. I would guess they are for non-WOT timing. The table Ken adjusted was the low octane table. This table goes up to 8000 rpms at 200 intervals. Our car runs fine up to 7200 rpms. Our timing is at 38 degrees on the low octane table and (would you believe) 19 degrees on the base timing table? I hope this helps?
I just looked at my Z28's BIN file. We did not alter the base timing table, both the drive and park tables are as you describe. I would guess they are for non-WOT timing. The table Ken adjusted was the low octane table. This table goes up to 8000 rpms at 200 intervals. Our car runs fine up to 7200 rpms. Our timing is at 38 degrees on the low octane table and (would you believe) 19 degrees on the base timing table? I hope this helps?
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I better go change my base table back to stock. So what I need to do is copy my high octane table into my low octane table? Is there a quick way to do this with LS1Edit, like a copy and paste or am I stuck entering them one at a time?Edit: Nevermind, there is a copy and paste option in ls1edit. I just couldn't get it to work until now. You have to make sure the number of cells you highlight is the same for both the copy and the paste.
I went and changed the low octane table to all of the values in the high octane table. Hopefully this works.
Last edited by PewterZ28; Jun 3, 2005 at 03:43 AM.
