TRNW-2: 6L hp tuning

[Steve Everett]

I agree with you Fred,  I don't mess with it because I don't want to tinker
too much with the way it works, if the customers engine isn't running
perfect any little misfire or stumble will be amplified with tcc slip set
to zero,  and to my knowledge there have been no torque converter related
comebacks on any of the units we've just delayed the apply till 4th or
5th,  the early apply the factory has is apparently the main reason for the
converter failures

   and if  you are going to zero the tcc slip then you'll have to disable
DOD, and I'm not doing that unless the customer is okay with it, a shop I
worked at previously was doing it on every build and never asking or
informing the customer they did it,  only admitting if the customer come
back saying their mileage deteriorated on highway trips

 Steve

  Steve

On Sat, Nov 1, 2025 at 9:27 AM Fred Whitaker via trnw2 <trnw2 at trnw.net>
wrote:

>  There were several threads on the HP tuners forum a few years ago where
> TranyBob was explaining why you don't want to set converter slip to zero.
> Something about warping the apply piston I believe.  I have no idea if that
> line of thought still holds true. But I will never mess with slip.
>  I will disable lock up below 4th or 5th ,or a certain speed in trucks
> that haul. But for the average truck I just don't see the need to mess with
> it. I know a lot here disagree. It's just my opinion.
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Phil
> Materi via trnw2 <trnw2 at trnw.net>
> *Sent:* Friday, October 31, 2025 5:46 PM
> *To:* Brett Karulak <brettsb16a2 at gmail.com>; Technical Discussion Forum <
> trnw2 at trnw.net>
> *Subject:* Re: TRNW-2: 6L hp tuning
>
> We are turning TCC off in 1,2,3 and not adjusting any apply or slip
> speeds.  We live in a city with a lot of stop and go traffic, and very
> hilly terrain.  We first tried changing other TCC parameters like others
> have mentioned and nothing but complaints.  Now that our local TC build
> shop has figured out how to make the TCs last without redeveloping a
> shudder, they work well with just turning TCC off in 1,2,3.
>
> Phil Materi
> A&B Transmissions
> Langley, B.C.
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of
> Brett Karulak via trnw2 <trnw2 at trnw.net>
> *Sent:* October 31, 2025 11:39 AM
> *To:* Technical Discussion Forum <trnw2 at trnw.net>
> *Subject:* TRNW-2: 6L hp tuning
>
> Those who are tuning, I know it's popular to command lock up only in 5th
> and 6th.  Do any of you let it lock up in 4th also?  I just tuned one and
> left 4th strategy alone, no lock up 1-3 and zero slip speed in 5th and
> 6th.  Just wondering what most of yall do.  It felt great and not sure if
> it really matters.
>
> Thanks,
> Brett Karulak
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