Tune relearn question

[RickyRecon]

So I know after flashing the car will shift weird for a little while, but so far I’m only noticing one thing that “bothers” me, and I’m wondering if it’s a normal part of the relearn process, or if I should send a log out.

It’s shifting fine through all gears at all throttle ranges except from 1st to 2nd under WOT. Right before shifting to second it will drop power, almost like if you took your foot off the gas or something, and then shift. After a couple 0-60 pulls it will shift fine a few times, then hit or miss after that, but mostly shifts like it should after that. Like I said, it only does it under WOT from 1st to 2nd.

I’m leaning towards it just being the car settling into the tune, since today is only the 3rd day having the tune loaded, but wanted to ask here if it’s something to be concerned over…so as not to send a log and waste someone’s times reviewing an unnecessary data log. I sent Matt a PM on here, but I don’t know how often he logs onto this forum these days

 

[76FoMoCo]

Send him a log and tell him it will miss shift. He will make the adjustments and send you a new tune to adjust the shift.

 

[RickyRecon]

him a log and tell him it will miss shift. He will make the adjustments and send you a new tune to adjust the shift.

Right on. I appreciate it

 

[RickyRecon]

Send him a log and tell him it will miss shift. He will make the adjustments and send you a new tune to adjust the shift.

Lol of course, I go out an do the data log, and it shifts like absolute butter multiple pulls in a row. I’ll just keep an eye I guess

 

[FiveLeeter918]

Send Matt a datalog, and they'll advise on what mechanically can be done or provide a revision.

If you have access to your datalog, open it in Livelink and look at your "Torque Source" values as you reach the top of 1st. It should give you a number. At the top of LiveLink click "Tools" then "List" and it will give you a cross reference for all of those numbers.

Often times when this happens it's due to traction control engaging due to wheel spin (torque source 2) and the RPMs will increase so fast with no load that it will essentially fly past the shift command and the throttle body will close to prevent it from hitting the hard limiter. Usually this pops up as a Torque Source 1 or 4, and turning off Traction Control during a pull can usually remedy this. The Torque Mounts from Anthony DiCunzolo usually help it a lot too as they reduce the flex between the engine and transmission.

Not all source codes are displayed in this list for some reason, so if you get a number not in the "Torque" source code list, post it here and we can decipher it for you.

 

[Ta2dResqr]

Check Trans fluid level too. Just had an issue after a tune, I was getting a hard 1-2 shift and I was getting a hard slam when I coast down to ~15mph and then give it a little bit of gas to get back to speed. No symptoms before. I did a drain and fill and made sure it was topped off. It shifts like butter now.

 

[FiveLeeter918]

Check Trans fluid level too. Just had an issue after a tune, I was getting a hard 1-2 shift and I was getting a hard slam when I coast down to ~15mph and then give it a little bit of gas to get back to speed. No symptoms before. I did a drain and fill and made sure it was topped off. It shifts like butter now.

this is true to. Also, a lot of folks have good results from overfilling the trans by a pint of fluid.

 

[RickyRecon]

I had the trans flushed an filled back in January along with all the other fluids, but I’ll check it out and throw some extra in there if it looks good.

I did go out and data log and of course it shifted just fine and hasn’t done it again since. Should I send him the log anyway, or would it be moot since the problem didn’t occur during recording?

 

[RickyRecon]

this is true to. Also, a lot of folks have good results from overfilling the trans by a pint of fluid.

I had the trans flushed an filled back in January along with all the other fluids, but I’ll check it out and throw some extra in there if it looks good.

I did go out and data log and of course it shifted just fine and hasn’t done it again since. Should I send him the log anyway, or would it be moot since the problem didn’t occur during recording?

 

[FiveLeeter918]

I had the trans flushed an filled back in January along with all the other fluids, but I’ll check it out and throw some extra in there if it looks good.

I did go out and data log and of course it shifted just fine and hasn’t done it again since. Should I send him the log anyway, or would it be moot since the problem didn’t occur during recording?

I'd still recommend sending in a datalog for verification and optimization no matter who you are tuned by, as every car is different and the tuner will not only be able to verify their own work, but also ensure the integrity and health of your engine to determine if they need to need to make any adjustments based on your actual vehicle compared to their OTS tune.