[danhr]

Originally Posted by parish8

I did, he hasn’t tried a 17+.

I did look closer at my tune from back when I tried it and I did not have the part throttle mph’s set to exactly the same as the wot mph’s. I bet that was my problem. If I ever get back to working on my car I will have to give that a try.

Did you also zero out the RPMs?

[parish8]

Originally Posted by danhr

Did you also zero out the RPMs?

no but I had them set low, like 6000rpm. I need it to shift around 7000rpm and it was shifting past that. i think my problem was my part throttle numbers were too high and not matching the wot numbers. i cant wait to try it again.

i really do look for things to make the car easier to race and more consistent. it will be great if this works.

[Laconic]

Originally Posted by Laconic

You the same Parish that had the truck?

Found that answer in another spot on here. I bet you get that a lot...Your a street racing legend! I am building a truck too.

[KingLT1]

Originally Posted by parish8

I did, he hasn’t tried a 17+.

I did look closer at my tune from back when I tried it and I did not have the part throttle mph’s set to exactly the same as the wot mph’s. I bet that was my problem. If I ever get back to working on my car I will have to give that a try.

I am almost positive that is your problem. Mine did the same thing until I lined those 2 tables up.

[CoeusAscended]

Do you guys mean launching in second with launch control or completely manual? And what are your best results if manual, revving to 2k roughly just like the launch control would or just pedal to the metal?

[laynlo15]

Launch control will pull timing and apply torque management to help keep from spinning the tires. You'll have slower times and no one that I know actually uses it at the track. I think it can work on the street. I've launched in 2nd and after the launch just slap it over to 2nd gear and let it shift out automatically. I know some have done it another way in the hp tuners tables, but that's how I've done it. I do it the same way roll racing.

[CoeusAscended]

Originally Posted by laynlo15

Launch control will pull timing and apply torque management to help keep from spinning the tires. You'll have slower times and no one that I know actually uses it at the track. I think it can work on the street. I've launched in 2nd and after the launch just slap it over to 2nd gear and let it shift out automatically. I know some have done it another way in the hp tuners tables, but that's how I've done it. I do it the same way roll racing.

Interesting, I manage to get consistent 4.1sec 0-62mph with launch on the street with street tires in good weather, but did notice that with launch control there seems to be room for improvement on the times for sure, I suppose that's the timing being pulled being made noticeable. But I like that there is some "free time" to be gained by dialing in the launching, another reason to look forward to next season

[Yosh6]

Went to the strip last Sunday with 1 goal in mind. Launch in 2nd gear and see if it would improve the 60'. Made two passes launching in M-2 and then moving shifter over to "D" immediately after the launch. Looked at data logs after second run and found that it actually left in 1st both runs even though dash indicator said M-2. First run shifted 400 RPM early and second run shifted 500 RPM late. Just like KingLT1 said, at least on 2016's, that technique disrupts shift timing. First run was a 10.81 and second run was a 10.93. Made one more pass in "D" and ran a 10.83. What I learned was my car does not respond to this technique and late shift is worse than early shift. Would like to get this figured out over the winter.

[Umbriel]

Originally Posted by Yosh6

Went to the strip last Sunday with 1 goal in mind. Launch in 2nd gear and see if it would improve the 60'. Made two passes launching in M-2 and then moving shifter over to "D" immediately after the launch. Looked at data logs after second run and found that it actually left in 1st both runs even though dash indicator said M-2. First run shifted 400 RPM early and second run shifted 500 RPM late. Just like KingLT1 said, at least on 2016's, that technique disrupts shift timing. First run was a 10.81 and second run was a 10.93. Made one more pass in "D" and ran a 10.83. What I learned was my car does not respond to this technique and late shift is worse than early shift. Would like to get this figured out over the winter.

Well this sounds disappointing, especially with my new build.

Sent from my SM-G955U using Tapatalk

[TheRealJA105]

I can physically feel my car jolt into second gear when i click the paddle for a second gear launch.

[KingLT1]

Originally Posted by Yosh6

Went to the strip last Sunday with 1 goal in mind. Launch in 2nd gear and see if it would improve the 60'. Made two passes launching in M-2 and then moving shifter over to "D" immediately after the launch. Looked at data logs after second run and found that it actually left in 1st both runs even though dash indicator said M-2. First run shifted 400 RPM early and second run shifted 500 RPM late. Just like KingLT1 said, at least on 2016's, that technique disrupts shift timing. First run was a 10.81 and second run was a 10.93. Made one more pass in "D" and ran a 10.83. What I learned was my car does not respond to this technique and late shift is worse than early shift. Would like to get this figured out over the winter.

Yep, sounds like you should look into the TUTD manual mode tuning. I have a write-up on it in the transmission section if you are interested.

[Yosh6]

Originally Posted by TheRealJA105

I can physically feel my car jolt into second gear when i click the paddle for a second gear launch.

Interesting. I didn't use the paddle. I used the shifter. Moved shifter to the left for Manual (Dash display - M1) then pushed it forward once for second (Dash display - M2). Could it make a difference which method you use to get to M2 ???. I wouldn't doubt it. This is the most fickle vehicle I have ever owned, bar none X 10. I had a panic moment on one of these runs. It wouldn't go in to Manual period. Moved shifter back and forth, turned nannies off and on. Killed engine and re-started. Nothing. Finally, just sat there and looked around. Passenger window down 6". Rolled it up. Went into manual.

[Yosh6]

Originally Posted by KingLT1

Yep, sounds like you should look into the TUTD manual mode tuning. I have a write-up on it in the transmission section if you are interested.

Yes, I'm very interested. I'll look it up. Thanks!

[Yosh6]

Originally Posted by KingLT1

Yep, sounds like you should look into the TUTD manual mode tuning. I have a write-up on it in the transmission section if you are interested.

Looked up your post in the transmission section and found that it is giving you exactly the results that I am looking for if it will allow a true second gear launch. Brett calls it "Manual Mode Roll Tuning". I've reached out to him to change my tune but, haven't heard anything yet. No worries though; he is a very busy man these days.