[RMiller0811]

So I keep seeing some horror stories about people blowing their 68rfe tranny. Although many of these stories are 2010 and older trucks it still has me a little worried. I know I have read that these trannys are just about maxed out for power capabilities but would a mild tune (60 hp) rele be the breaking point of a tranny? Does the high output make the tranny any stronger? Has anyone with a 2011.5 and up high output blown their tranny with a mild tune dpf/egr delete and intake? Just doesnt sound right to me.


Thanks

 

[jlmaster]

I have a 2011.5HO and I run Hot 75% of the time with just overdrive.

 

[Ruthless.]

Hot 90% of the time timing setting 3, wild timing 3 the rest with HO tuning. im not exactly easy on my truck and i deleted at 1200 miles and now have 32000 and everything seems okay.

2011.5 HO on 37s. i keep hearing the horror stories too and it makes me nervous but f**k it, if it goes i guess it goes :/

 

[prerunr59]

Pay to play. That should sum it up for you

 

[RMiller0811]

Im not really trying to play though lol. A mild tune isnt exactly playing when the only reason I am running a mini maxx is for mpg and a healthy truck not to be a dragster

 

[jlmaster]

Rmiller I have no doubt that on mild u will be fine. Just dont do boosted launches lol.

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[RMiller0811]

Lol I hve no reason to launch period. Just want to get better mpg and have a breathing cummins. I have heard that wild/3 is best for mileage but dont know if I wanna run that much power. Would run it here and there but if I set my timing to 3 (for the sake of wild/3) would it be ok to turn it down to mild/3 when I dont want to run wild. Im asking this bc most people say to run timing 2 with mild.

 

[jlmaster]

Yes u will be fine. Where u could possibly mess things up is if u set ur defuels which goes to no power and still running timing 3. I took all my defuels off and just watch my boot and temp gauge and dont get on it ovee 45% throttle til it has cycled the coolant atleast once.

 

[RMiller0811]

Yes u will be fine. Where u could possibly mess things up is if u set ur defuels which goes to no power and still running timing 3. I took all my defuels off and just watch my boot and temp gauge and dont get on it ovee 45% throttle til it has cycled the coolant atleast once.

Sorry for a dumb a** question buy how do you know when your coolant cycles?

Also should I run a combination of mild/wild/2 or mild/wild/3?

Thanks!!

 

[jlmaster]

Ok my def of coolant cycle is when it gets up to temp + then the thermostat opens up and the temp drops. Thats what I consider a heat cycle in this reference.

 

[Dieselhed]

Watch your coolant temp on the EVIC. Should hit 200+ then open the thermostat and drop back down. Your coolant has cycled.

 

[RMiller0811]

Thanks guys

 

[RMiller0811]

Also what would you guys say is safer for my hg/tranny?

A combo of mild/wild/2 or mild/wild/3?

Keep in mind I will spend 90% of my time running mild unless I experience for myself that wild really does give you alot better MPG. If its only an icrease of like 1-1.5 than I will more than likely still stay tuned to mild for my own peace of mind.

 

[prerunr59]

Im not really trying to play though lol. A mild tune isnt exactly playing when the only reason I am running a mini maxx is for mpg and a healthy truck not to be a dragster

I understand. I'm sure it will be fine. But you are playing with it and adding at least 60hp/100ftlbs. So you may have to pay...

 

[NorCaler]

Also what would you guys say is safer for my hg/tranny?

A combo of mild/wild/2 or mild/wild/3?

Keep in mind I will spend 90% of my time running mild unless I experience for myself that wild really does give you alot better MPG. If its only an icrease of like 1-1.5 than I will more than likely still stay tuned to mild for my own peace of mind.

mild/2 will be easier on your equipment when compared to wild/3.

Also you made a comment earlier about mpg on the different tunes...to answer your question, it will be less than 1.2 mpg for the options you are considering. Actually wild/4 provides the best mpg, but thats not on your list for obvious reasons. I just ran wild/2 last night on a 3 hour test run and so far I'm liking how its a nice balance between mild/3 and wild/3. The wild/2 doesn't rack up high boost during cold weather like the wild/3 does and the EGT's are even lower. I expected the wild/2 EGT's to be higher than wild/3 EGT's but that wasn't the case. I'm guessing it has something to do with our Cummins 6.7 cam and its design for a slightly less retarded timing. I'm looking forward to towing with this tune and seeing what happens. :thumbsup:

 

[RMiller0811]

What are most guys getting mpg wise on mild/2?

And is wild/2 safer than wild/3? I dont think I have read many people running wild/2

 

[joelc79]

Im a 08' but still on stock trans. I have been deleted for 110k out of my 150k. The first i did a fluid/filter flush was at 110k miles. It was black and stunk bad, added a deep pan and all is still good. I have towed, 4x4'd, but mostly highway drive it. I do give a lot of credit to my tuned tcm. I think that i the key... Keep the shifts firm with added psi.
I also have ran Smarty Jr., H&S, and now on a nice smooth EFI auto-cal from Starlite.

 

[NorCaler]

What are most guys getting mpg wise on mild/2?

And is wild/2 safer than wild/3? I dont think I have read many people running wild/2

mild/2 only gave me .5 mpg better than my stock truck if my truck didn't go into a regen on a long road trip. Including all the regens from my stock truck the mild/2 tune probably nets about 1.5 mpg gain over a stock truck. mild/2 isn't the tune for best mpg's, but its a safe smooth tune that feels very natural for our Cummins 6.7.

In regards to mpg's:
mild/3 is slightly better than mild/2
wild/2 is slightly better than mild/3
wild/3 is slightly better than wild/2
wild/4 is the best hands down for mpg's.

I never even thought about wild/2 being an option, but everytime I tow with my timing on level 3 the mpg's drop when compared to level 2 timing. I always get better mpg's towing on level 2 timing, so I figured why not leave the timing on level 2, but inject a little more fuel with the wild tune and so far its a great tune. I'll report back further details when I get to tow with it. A lot of this has to do with how you use your truck and what axle ratio you have and tire size. When you look at the timing charts from H&S you will find that based on rpm's alone it will place you into a slightly different timing degree before top dead center. You have to find out exactly what speed you wish to drive or tow and then find that rpm and then match your tune for your exact truck specs.

 

[Dean M.]

Norcaler, I'm still towing on wild 3, but may have to try the timing 2. Still need to get the OD tune.

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[GSM24]

mild/2 only gave me .5 mpg better than my stock truck if my truck didn't go into a regen on a long road trip. Including all the regens from my stock truck the mild/2 tune probably nets about 1.5 mpg gain over a stock truck. mild/2 isn't the tune for best mpg's, but its a safe smooth tune that feels very natural for our Cummins 6.7.

In regards to mpg's:
mild/3 is slightly better than mild/2

wild/2 is slightly better than mild/3
wild/3 is slightly better than wild/2
wild/4 is the best hands down for mpg's.

I never even thought about wild/2 being an option, but everytime I tow with my timing on level 3 the mpg's drop when compared to level 2 timing. I always get better mpg's towing on level 2 timing, so I figured why not leave the timing on level 2, but inject a little more fuel with the wild tune and so far its a great tune. I'll report back further details when I get to tow with it. A lot of this has to do with how you use your truck and what axle ratio you have and tire size. When you look at the timing charts from H&S you will find that based on rpm's alone it will place you into a slightly different timing degree before top dead center. You have to find out exactly what speed you wish to drive or tow and then find that rpm and then match your tune for your exact truck specs.

Aaron, which combinations of tune and timing listed is hardest on the head gasket. The OP is concerned about the 68RFE. I think the weakest link is the head gasket and not the transmission on these trucks. Am I off base here?

As you're aware, I'm running a stock truck. However, I follow the Cummins forum and haven't seen problems with the 68RFE. There seems to be more posts regarding blown head gaskets on tuned trucks and very few if any posts regarding problems with the transmissions.