24x tuning.
Thread Starter
TECH Apprentice
Joined: Dec 2008
Posts: 372
Likes: 1
From: Kinston North Carolina
24x tuning. I have jet dst software from tuning the old lt1 pcm. Now I've done the 24x conversion. Does anyone tune the ls1 pcm with jet software. I know HP tuners is more desired but I can't see it justified for the extra cost. Do you normally unplug the maf and tune in speed density first?
You should be able to buy a definition file from JET. Try to read your PCM, you should get an error message, write the operating system number it gives you. Give that number to JET, they should be able to sell you the correct definition file. You don't have to have it to tune LS1 PCMs. I use OBD2 Tunercat for those. That's who did the JET software.
No, don't "turn the MAF off and tune SD first", then you are going to think the MAF table is wrong. The PCM uses them together, blended.
No, don't "turn the MAF off and tune SD first", then you are going to think the MAF table is wrong. The PCM uses them together, blended.
Thread Starter
TECH Apprentice
Joined: Dec 2008
Posts: 372
Likes: 1
From: Kinston North Carolina
You should be able to buy a definition file from JET. Try to read your PCM, you should get an error message, write the operating system number it gives you. Give that number to JET, they should be able to sell you the correct definition file. You don't have to have it to tune LS1 PCMs. I use OBD2 Tunercat for those. That's who did the JET software.
No, don't "turn the MAF off and tune SD first", then you are going to think the MAF table is wrong. The PCM uses them together, blended.
No, don't "turn the MAF off and tune SD first", then you are going to think the MAF table is wrong. The PCM uses them together, blended.
FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
Don't try to calibrate VE or MAF with them both on... To tune them right one or the other needs to be turned off to force airflow calculations to one of the two methods so that your adjustments aren't scewed by the other. Once you calibrate both separately and turn them both back on blended you will have a well setup tune.
You would throw the Jet in the trash can if you tried HPTuners or Efilive. So much more flexibility especially with data logging.
You would throw the Jet in the trash can if you tried HPTuners or Efilive. So much more flexibility especially with data logging.
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Verdad Gallardo FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
Picking power up over a factory tune is no problem. Guys that put one in SD mode, then exclaim "GM had the VE table all jacked up", then turn the MAF back on, and " it was screwed up too" don't have a clue. There is more to it than that.
I get vehicles in here all the time to re-do that were tuned that way. As far as I know, none of yours. Maybe the dumbest thing I see done is DFCO disabled.
I get vehicles in here all the time to re-do that were tuned that way. As far as I know, none of yours. Maybe the dumbest thing I see done is DFCO disabled.
FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
MAF tables usually aren't off from the factory much from what I've seen if the intake tract hasn't been changed much to disrupt the airflow through the meter. But generally the VE tables are... however in blended state the VE table isn't referenced but only on abrupt throttle transients anyway and up to a certain rpm. I personally alway's go through the entire rpm range once the final "blended" tune is flashed back in to verify all fueling is still spot on.
I have seen some pretty crazy stuff come in as well.
I have seen some pretty crazy stuff come in as well.
Picking power up over a factory tune is no problem. Guys that put one in SD mode, then exclaim "GM had the VE table all jacked up", then turn the MAF back on, and " it was screwed up too" don't have a clue. There is more to it than that.
I get vehicles in here all the time to re-do that were tuned that way. As far as I know, none of yours. Maybe the dumbest thing I see done is DFCO disabled.
I get vehicles in here all the time to re-do that were tuned that way. As far as I know, none of yours. Maybe the dumbest thing I see done is DFCO disabled.
