4l80 Tune issue
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Teching In
Joined: Jan 2019
Posts: 30
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4l80 Tune issue Hey guys so I recently 4l80 swapped my 99 camaro from a 4l60. To start I segment swapped my stock tune for the 4l80 and got it to run and drive this way, everything is fine but shift pressures are off and shift points suck. I am not good at tuning by any means, so I had a reputable shop do the rest. The car shifts amazing now but after I got the car home I noticed the converter Is locking in first gear @ 4k RPM which makes the car fall on its face and locking in reverse which makes the car die. I put my old tune back in, and the problem goes away. Normally, I would just take the car back to the shop but it is two hours away and I'm busy with work. Any idea what I should change in the shop tune to fix this? I attached both tunes, Thanks!
Teching In
Joined: Jan 2017
Posts: 22
Likes: 2
From: Houston Texas
Sounds like a mechanical or electrical issue. To my knowledge there aren't any tables available to lock the converter in first gear let alone reverse. I looked over the files and I did not see anything out of the ordinary.
Post 6 has a link to how to tune the trans.
https://ls1tech.com/forums/pcm-diagn...questions.html
It looks like your tuner changed the tables for the apply speeds.....they were set to 256, why he dropped them I don't know. Anyway, max the first two tables and then tune the lockup in the 4th gear table....
T,
https://ls1tech.com/forums/pcm-diagn...questions.html
It looks like your tuner changed the tables for the apply speeds.....they were set to 256, why he dropped them I don't know. Anyway, max the first two tables and then tune the lockup in the 4th gear table....
T,
Thread Starter
Teching In
Joined: Jan 2019
Posts: 30
Likes: 1
I would definitely agree but as soon as I put my original tune back in, the issue was gone.
Thread Starter
Teching In
Joined: Jan 2019
Posts: 30
Likes: 1
Post 6 has a link to how to tune the trans.
https://ls1tech.com/forums/pcm-diagn...questions.html
It looks like your tuner changed the tables for the apply speeds.....they were set to 256, why he dropped them I don't know. Anyway, max the first two tables and then tune the lockup in the 4th gear table....
T,
https://ls1tech.com/forums/pcm-diagn...questions.html
It looks like your tuner changed the tables for the apply speeds.....they were set to 256, why he dropped them I don't know. Anyway, max the first two tables and then tune the lockup in the 4th gear table....
T,
Teching In
Joined: Jan 2017
Posts: 22
Likes: 2
From: Houston Texas
Looked over your tune again and noticed some CELs are different. Some of them refer to the transmission. It might be worth a shot to experiment with changing them.
p0716 and p0717 are turned off on the shop tune
p0740, p0785, p1810, p1860 and p1870 are turned off on your tune
p0716 and p0717 are turned off on the shop tune
p0740, p0785, p1810, p1860 and p1870 are turned off on your tune
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Verdad Gallardo Teching In
Joined: Jan 2017
Posts: 22
Likes: 2
From: Houston Texas
Thread Starter
Teching In
Joined: Jan 2019
Posts: 30
Likes: 1
Thread Starter
Teching In
Joined: Jan 2019
Posts: 30
Likes: 1
So I did this and made sure I transferred everything. The car is still shifting instantly through the gears when moving at all in Drive, and wont downshift until it almost stalls coming to a complete stop in third gear. Makes no sense, all the settings are exactly the same as the other tune. Starting to hate this segment swap deal.. No issue with the lockup though.
Last edited by Brendyn G; Oct 11, 2019 at 02:04 PM.