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Nov 24, 2021 | 09:14 PM

#31

RacinJasonWV

Lead Driver

Joined: Jul 2017

Posts: 6,864

Likes: 2,337

From: WV

Quote:

Originally Posted by ScaldedDog

Thanks man. I tried the PHP tunes years ago, but not yet this time. I'm not sure if I'm picky, spoiled, or both, but I think tow tunes ought to have different transmission behavior than DD tunes, and I recall the PHP ones being the same.

Hey you’re allowed to be picky (or spoiled)! No worries there. Hope you can get it dialed in for what suits you best.

The tow tunes do have different shifting on my truck. It holds the gears longer and kicks down sooner I think. Maybe you’re using a different strategy causing them to not be as noticeable on your vehicle? Or maybe a factor of multiple things? Or maybe you just like the DP shifting better? Hopefully the EGTs will be down so at least your end goal will be achieved.

Related to shifting. I did notice a big difference in shift characteristics between the 364.5/73 & 363/68 turbos. The larger turbo just felt “off”. It felt like it shifted too early and snuffed out the power and also felt too harsh. The change was significant enough that my dad noticed it from the passenger seat and said something about it without me prompting him. I also found a plenum leak later but not gonna send you down that path as I know you have already looked it over well.
Point is, what I found was the shifting strategy seemed to work best when my turbo was closer to a “stock” configuration.

Nov 24, 2021 | 09:33 PM

#32

ScaldedDog

Thread Starter

Fleet Mechanic

Joined: Aug 2010

Posts: 1,466

Likes: 162

From: Sedalia, CO

Quote:

Originally Posted by ESwift

Tow tunes should present shifting differently more so when towing, because then you are using more throttle pedel position %, you may not fully feel the difference like you are expecting if you are driving empty to judge them.

Quote:

Originally Posted by RacinJasonWV

The tow tunes do have different shifting on my truck. It holds the gears longer and kicks down sooner I think. Maybe you’re using a different strategy causing them to not be as noticeable on your vehicle? Or maybe a factor of multiple things? Or maybe you just like the DP shifting better? Hopefully the EGTs will be down so at least your end goal will be achieved.

Fair enough, and I should test them as designed before making judgement.

Quote:

Originally Posted by RacinJasonWV

Related to shifting. I did notice a big difference in shift characteristics between the 364.5/73 & 363/68 turbos. The larger turbo just felt “off”. It felt like it shifted too early and snuffed out the power and also felt too harsh. The change was significant enough that my dad noticed it from the passenger seat and said something about it without me prompting him. I also found a plenum leak later but not gonna send you down that path as I know you have already looked it over well.
Point is, what I found was the shifting strategy seemed to work best when my turbo was closer to a “stock” configuration.

That's interesting. I've decided to leave my MST alone unless and until I can't get any tune to give me the modest improvements I'm seeking, or I feel the need to replace my injectors. KCT did me a favor by not including their Stage 1 on a Black Friday deal...

Mark