Towing Heavy Transmission Temps

Geotrash said:

I suppose this gives me a reason to finally take the shrink-wrap off my MPVI3 and hook it up to my computer and Yukon. The tune in my 2012 was done by Blackbear and I also still have a copy of the stock tune files.

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Heck Yeah !!!
You can just do a "read only" and see what you have.. SAVE that tune !!!!!!!!!
You'd be surprised at all the stuff there - lots above my pay grade

can the new mpiv3 log without a lap top?

My old mpiv1 I can setup what pids to log and there's a bit of internal memory. I keep it mounted in the glove box of my ls3 car, so I can just reach over and hit the log button of I notice something weird. later take it inside when I have time to scan the log.. for the truck you could be towing, see a big incline. hit the record button and log the whole thing without having to pay attention to it. inspect the log later one to see if there's anything interesting.

I've wondered if the new ones still do that being little wireless dongles.

Foggy said:

Second one looks pretty similar to my timing map !! I'm sure that there are
some spark adder modifiers that come into play as cylinder airmass changes.
Ive re-smoothed several cells in mine and taken out 1-2* here and there..
I won't be towing the beast for a couple more weeks or so, so I won't know
any new data til then.. And it may be a lot cooler - who knows around here

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yeah I don't know what all modifiers each tune would have. the 2nd one is my c6. that's a light weight manual ls3 93 tune. it's been about 2 years since I even looked at a log from it, but I don't remember final timing at at wot being much more than the base map, but that's also just wot logs I was looking at. never looked at a log towing heavy at part throttle.

j91z28d1 said:

can the new log without a lap top?

My old mpiv1 I can setup what pids to log and there's a bit of internal memory. I keep it mounted in the glove box of my ls3 car, so I can just reach over and hit the log button of I notice something weird. later take it inside when I have time to scan the log.. for the truck you could be towing, see a big incline. hit the record button and log the whole thing without having to pay attention to it. inspect the log later one to see if there's anything interesting.

I've wondered if the new ones still do that being little wireless dongles.

Click to expand...

Not that I'm aware. I have the mpvi2.. Have to have a laptop for anything

they should have at least made a phone app what could store a log for you.


lame, I hope my 1 never goes bad. I see the first gens pop up for sale for the same price as new ones, I wonder if that's why.

I have the mpiv3. It can do standalone logging but the polling rate is much reduced. To get anything useful you still need laptop to record.

I been reading about this issue but in old school world heavy 1/2 ton rig shouldn't go over 12,000 lbs GVCW ( truck and trailer ) it was just a rule of thumb for years. And with a 24 ft travel trailer hitting 6250 and 1500 lbs of gear water etc. 7750 lbs and if rig at 5700 lbs 13,450 lbs add people and fuel your over 14,000 lbs . Its numbers RV people been fighting for years. I see 30-35 ft trailers guys pulling with 1/2 tons pretty much all of them can tell you a transmission story. Depending on how many miles they pull them.
This just what I have learned for years .. Hope the info helps someone..

I have a 2009 tahoe with the upgraded towing package. I towed a 7500lb camper 200 miles at 60mph. My trans temp got to 215 but mostly stayed under that. Now my trans shifts different than before I did the tow. Any ideas?

mikez71 said:

I have the mpiv3. It can do standalone logging but the polling rate is much reduced. To get anything useful you still need laptop to record.

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that's good. mine has small storage, so you gotta be picky about what you need to log. you wouldn't be tuning vve tables off it. but it's super helpful for issues

Yep mine even missed logging some shifts, perhaps if I reduce the channels recorded, but a lot of resolution is lost..