L31 Vortec tuning
03-09-2017, 10:57 AM
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L31 Vortec tuning
Hi guys. So I have a 97 K2500 suburban with the 5.7 L31. I have had a JET hand held tuner tune on it for a couple years. I will be swapping over to a 411 pcm in the next couple weeks (Mild LQ9 will be going in in the early summer). I do have access to HP tuners and I will be tuning the 411 PCM and segment swap, I have that down pretty good. Question is, has anyone pulled a JET tune off of their black box pcm? (97,98,99) and compared to a stock 97-99 tune? I like some of the things that tune did to the truck and of course dont like some of the things it did. I would like to compare both tuned and stock tunes to see what that programmer actually changes. I believe the 97-99 L31 had the same tune but only the 98,99 computers HP tuners can read. So If anyone in the Boston area has a Stock 98,99 L31 truck and wants this JET programmer you can have it, I just would like to pull the tuned and stock file off your truck.
03-16-2017, 07:06 PM
#2
There is a Jet tuner program that was originally Tuner Cat program that is fairly versatile for tuning even LS motors. Not sure HP can read anything that is not a 411, at least from what they told me years ago-even thought the Jet/Tuner cat can.
My experience with handheld from Hypertech on my 97 Vortec was their tune made it ping more and actually ran slower.
My experience with handheld from Hypertech on my 97 Vortec was their tune made it ping more and actually ran slower.
03-16-2017, 08:00 PM
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A jet hand held tuner is like a Hypertch, not the same as the Tunercat OBD2/Jet Dynamic Spectrum tuner.
OP I've read plenty of 96-99 Black box PCMs with Hypertech tunes installed and you would laugh at how little they change vs their cost. I would guess the Jet hand held is not much different. HP tuners only supports the 98-99 black box PCMs so you would have to have the TC OBD2 or Jet DST to even see what was changed on a 96-97. I have TC OBD2.
OP I've read plenty of 96-99 Black box PCMs with Hypertech tunes installed and you would laugh at how little they change vs their cost. I would guess the Jet hand held is not much different. HP tuners only supports the 98-99 black box PCMs so you would have to have the TC OBD2 or Jet DST to even see what was changed on a 96-97. I have TC OBD2.
03-17-2017, 06:19 AM
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I understand that HP only supports the 98+ black box. That is why I was looking for some one with a 98+. That way I could load this JET program on their computer and be able to pull it with HP. I understand that the JET thing blows, however there are a few parameters that I like about it and I want to know specifically what those are. The only way to do that is to pull the tune.
03-17-2017, 09:49 AM
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Are you sure a JET Tuner for a 97 will even load on a 98? Even though 96-97 black box PCMs look similar to 98-99 externally they are different internally and the 96-97 PCMs have 5 connectors instead of 4. The calibrations are quite different too. And if you can't see what it is changing how do you know what the parameters are that you like? I understand what you are wanting to do but it is not the way to tune.
03-17-2017, 01:17 PM
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The JET programmer works on all the L31 motors without a 411 pcm. so from 96-2000. I was curious about what specifically this tuner changes on the ecu. I know I will be able to tune it with the 411 to the way I like it, I was just trying to gather some more information.
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04-20-2017, 05:52 PM
#8
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There is a Jet tuner program that was originally Tuner Cat program that is fairly versatile for tuning even LS motors. Not sure HP can read anything that is not a 411, at least from what they told me years ago-even thought the Jet/Tuner cat can.
My experience with handheld from Hypertech on my 97 Vortec was their tune made it ping more and actually ran slower.
My experience with handheld from Hypertech on my 97 Vortec was their tune made it ping more and actually ran slower.
04-20-2017, 07:17 PM
#9
Weird...I used the Hypertech spark map on my 1997 L31 Express Van I pulled from a 1998 C1500 that was Hypertech tuned. Ran 91 octane or better and never saw a detonation issue. Never really saw any knock retard either. I smoothed out the area they left untouched between the stock lower load timing table and the WOT timing they added. I did enable PE fuel earlier and bypassed the delay. Set the stoich fuel value to 14.1:1 to match the E10 gas and kept my PE AFR around 12.00 at peak torque and tapered off to 12.6 at peak hp and above. Dropped about 4 tenths off my 1/8 mile time. Factory LT4 cam and 1.6 rockers ran fine on that tune as well. Between the tuning/cam/rockers and 4.3 S10 converter I knocked a full second off the 1/8 mile times running stock manifolds.
04-20-2017, 10:29 PM
#10
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Really not worried about what you think!!
This is the Hypertech based map I have been running for years. Only small tweaks and some smoothing from what they tuned these engines with. With the stock cam they run 28° total timing. With any cam change at all, I see best results around 30°.
Before/STOCK
https://www.youtube.com/watch?v=WydwLghk_yw
After
https://www.youtube.com/watch?v=7SgptElOCpY
This is the Hypertech based map I have been running for years. Only small tweaks and some smoothing from what they tuned these engines with. With the stock cam they run 28° total timing. With any cam change at all, I see best results around 30°.
Before/STOCK
https://www.youtube.com/watch?v=WydwLghk_yw
After
https://www.youtube.com/watch?v=7SgptElOCpY