Help with cruise control after LS swap

[tmxmotorsports]

Did some searching. Lots of people have this issue where cruise only works in 4th after doing a manual swap. The computer seems to be calculating what gear the transmission is in by looking at engine speed vs. vss. If the computer can't find a matching ratio, you don't get cruise. The only way it works, is if your manual transmission has the same gear ratios as whatever transmission segment you swapped in (ZF6, nv3500, etc...). All of those transmissions have a 1:1 direct ratio, so the PCM sees that as valid, and allows cruise to work.

The general consensus seems to be that there is another set of transmission gear ratio inputs in the transmission or engine side of things that HPTuners doesn't expose that needs to be changed.

A workaround seems to be setting the vehicle for an automatic transmission. That seems to get cruise to work again.

I agree with this. I agree with lots of posts about this problem seems as op has covered everything but this.

 

[DocHanson]

Just a thought; Have you tried to get up to speed in 5th then set the CC. This seems like it should work. Sorry if this is way to obvious.
Dyno

Yessir, on a closed course in Mexico of course

 

[Lead Head]

Your google skills are better than mine my friend! Thank you for this, I will explore this option and report back!

I also have a little experience tuning Fords - no experience with HPTuners. We would run into weird issues where the transmission would do some odd or undesired behavior without any explanation or ability to change it. We had to work with the person who created the tuning file, and it turns out there were tons of parameters he simply never "exposed" in the tuning software because no one had ever requested them before.

What I would first do, is look through every table and parameter that HPTuners exposes to you, and see if you can find another place where gear ratio is referenced. If not, I would submit a support ticket and say that something (transmission segment?) is missing some gear ratio parameters, or the table is not exposed/working correctly.

What particular PCM are you using?

 

[DocHanson]

I also have a little experience tuning Fords - no experience with HPTuners. We would run into weird issues where the transmission would do some odd or undesired behavior without any explanation or ability to change it. We had to work with the person who created the tuning file, and it turns out there were tons of parameters he simply never "exposed" in the tuning software because no one had ever requested them before.

What I would first do, is look through every table and parameter that HPTuners exposes to you, and see if you can find another place where gear ratio is referenced. If not, I would submit a support ticket and say that something (transmission segment?) is missing some gear ratio parameters, or the table is not exposed/working correctly.

What particular PCM are you using?

I appreciate the insight and will definitely look into it. This PCM is a P59