TRNW-2: 6L hp tuning

[Tod Chretien]

By disabling the DOD you are doing the customer a tremendous favor. 
Whether they realize it or not. I don't think the gas savings makes up 
for the potential engine failure.

Although, it's totally wrong to turn it off without asking the customer 
first. It's also illegal to turn it off here in California. I'm not sure 
if and how they are enforcing that though.

-- 
Best Regards,
Tod Chretien
TRNW Inc.
https://www.trnw.net


On 11/1/2025 6:40 AM, Steve Everett via trnw2 wrote:
> 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 4^th  or 5^th  ,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
>     This message was sent from the TRNW Technical Discussion Forum
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>     TRNW Inc., 2825 Walnut Terrace, Modesto, CA 95355
>
>
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