LS1Edit Questions
Thread Starter
Le Mans Master
Joined: Jun 2001
Posts: 7,331
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From: Admit Nothing, Deny Everything, Make Counter Accusations.
LS1Edit Questions
I was considering the purchase of LS1edit and I have a few questions.
1) Has anyone here used it? Is it at all intuitive? I am a computer developer and consider myself highly technical, but I have never used a product like this.
2) I assume that this software only programs the PCM and I still need to use AutoTap and a dyno with wideband O2 to monitor the results of my changes.
3) If you install a mod like an aftermarket airbox are you supposed to use LS1Edit to reprogram closed loop operation to bring the LTFT values back down to 0, like you do with a MAFT?
4) On the other hand should you just forget about closed loop programming since the O2 sensors will always get 14.7:1 and just use LS1edit to program the WOT A/F ratio?
5) If you save your stock programming, reprogram with LS1Edit, and then restore your stock programming will a dealer be able to see with his Tech2 that you were messing with the PCM?
1) Has anyone here used it? Is it at all intuitive? I am a computer developer and consider myself highly technical, but I have never used a product like this.
2) I assume that this software only programs the PCM and I still need to use AutoTap and a dyno with wideband O2 to monitor the results of my changes.
3) If you install a mod like an aftermarket airbox are you supposed to use LS1Edit to reprogram closed loop operation to bring the LTFT values back down to 0, like you do with a MAFT?
4) On the other hand should you just forget about closed loop programming since the O2 sensors will always get 14.7:1 and just use LS1edit to program the WOT A/F ratio?
5) If you save your stock programming, reprogram with LS1Edit, and then restore your stock programming will a dealer be able to see with his Tech2 that you were messing with the PCM?
Drifting
Joined: Jul 2000
Posts: 1,517
Likes: 1
From: Stockholm
Re: LS1Edit Questions (rbartick)
Maybe I should not post this here.. I might get banned ..... But here it goes;
You will find a very useful info source about LS1-Edit, AutoTap and everything else related to computer diagnostics & tuning at http://www.ls1tech.com/ubb/cgi-bin/u...ubb=forum;f=23
You might want to check it out!
:cheers:
You will find a very useful info source about LS1-Edit, AutoTap and everything else related to computer diagnostics & tuning at http://www.ls1tech.com/ubb/cgi-bin/u...ubb=forum;f=23
You might want to check it out!
:cheers:
Team Owner
Joined: Dec 2000
Posts: 58,783
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From: D*ck ina Box
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St. Jude Donor '03-'04
Re: LS1Edit Questions (seanr)
Maybe I should not post this here.. I might get banned ..... But here it goes....
I just have a problem with a few of the boneheads over there that seem to have a problem with me but don't say anything to me about it :D
Instructor
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Re: LS1Edit Questions (rbartick)
LS1Edit is pretty intuitive to use, but there are many variables to choose from so you must go slow and only change what's familiar and ask questions about the rest.
Yes -- you need AutoTap to determine what changes you need to make and later to see the effect of the changes.
Concerning LTFTs -- the basic procedure is to bring the LTFT down to 0 or slightly minus so they won't affect the WOT power Enrichment. You do ythis by modifying the MAF tables with LS1Edit. After that (and taking additional AutoTap reads) you modify the Power Enrichment tables to get your O2 sensors in the .88 to .89 range (assuming you don't have access to a Wideband AFR sensor setup.
And -- LS1tech.com is an excellent source of info on this.
Don't know the question about the dealer -- I assume is you put the stock program back in then he couldn't tell, but I really don't know.
Dennis
Yes -- you need AutoTap to determine what changes you need to make and later to see the effect of the changes.
Concerning LTFTs -- the basic procedure is to bring the LTFT down to 0 or slightly minus so they won't affect the WOT power Enrichment. You do ythis by modifying the MAF tables with LS1Edit. After that (and taking additional AutoTap reads) you modify the Power Enrichment tables to get your O2 sensors in the .88 to .89 range (assuming you don't have access to a Wideband AFR sensor setup.
And -- LS1tech.com is an excellent source of info on this.
Don't know the question about the dealer -- I assume is you put the stock program back in then he couldn't tell, but I really don't know.
Dennis
Drifting
Joined: Aug 2001
Posts: 1,903
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From: Oakhurst NJ
Re: LS1Edit Questions (rbartick)
As far as can the tech see changes you made with LS1 edit, I am not sure but I dont think he can. I will ask when i pick up my car. I asked my tech if his scanner could show me A/F ratios and he said no. It really depends on what you change. The scanner does not show as much engine info as most people would think.
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Re: LS1Edit Questions (rbartick)
Everybody always says "the dealer cannot tell." Most have not read SAE J1979. Mode 09 Type 06 requests calibration id verification. The actual implementation is manufacturer dependent but onboard software is expected to calculate CVNs (i.e. checksums) based on memory content at the time of request. The capability is there. That's not quite the same as the capability being used though. ;)
Instructor
Joined: Jan 2002
Posts: 228
Likes: 0
From: Raleigh NC
Re: LS1Edit Questions (ToplessTexan)
I agree with ToplessTexan.. The functionality is definately present with the later model TECH II and GMTIS2000. The checksums are mostly to ensure that the file size is 512K. It cannot tell how many times the PCM was programmed or reprogrammed and I would guess that 99.9% of the GM techs will never check for data integrity or verify that the GM tables have not been compromised. They usually hook up the tech II, get the vin and last interation or ver of the code because the tech II uses the VIN and code info to cross reference the GM server for latest code depending on you vehicle, etc, etc.. Unless you've corrupted your PCM tables in which case your car won't, they will usually never know.
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