TRNW-2: 6L hp tuning

[Chris and Cathy Kershaw]

Do you guys that tune tcc or dod ever have emissions testing issues? Our
county doesn’t have emissions testing but next county over does, I’ve
always wondered if they would fail it somehow.

On Mon, Nov 3, 2025 at 8:25 AM Brett Karulak via trnw2 <trnw2 at trnw.net>
wrote:

> Thank you everyone for the responses.  I always inform my customers the
> advantage to disable dod and most of mine already have a disabler plugged
> into the dlc.  Im near San Antonio Texas and it seems most of these country
> customers already know about the engine failures.  Most of these people
> commute to SA so most put 30 to 60 miles one way to work.  They hit
> terrible traffic once they get close to the city, its mostly small hills
> and long stretches of some what flat roads. The reason i started tuning is
> because i had one truck that had cheap mounts in it from AZ or Orielys and
> after overhaul in dod you could feel that crap in the truck real bad, those
> mounts suck, i always install oe mounts but since they just had another
> shop put the aftermarkets in i fixed it turning off dod.  Then i had a
> florida billet shudder out of the box, so i tuned it out.  then another
> florida came back with a shudder, tuned that one out too.  I haven't bought
> another florida since but installed at least 10 total but back to only pnh
> billets, still never had a comeback of pnh, all units get either reamed tcc
> reg, or zip kit and sometimes if bore is still good transgo valve.  I have
> had success keeping dod at 20 rpms slip instead of 40, didn;t feel much.  I
> typically don't mess with pressure.  When i zero tcc slip in V8 mode, it
> will slip enough and bring it close to zero where i don't feel anything
> abnormal and no complaints.  It will not hold zero slip like when you block
> the valve in a 4l60e. I do agree though, small changes are a big difference.
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