Precision Industries. I like Yank and PTC as well. Never been a fan of Circle D. To me, they spend too much time and money on marketing, instead of a knowledgeable staff that knows how to spec someone the right converter on the first try.

Towing puts you in a tough spot. I’ve never towed with my truck because i know it would suck. Lol. Keep working on your tune until you get your new tow rig, then swap out that lame converter.

 

I use Circle D for turbo trucks and they have nailed them perfect every time. So i always go back to them.
If your converter isnt flashing what it is suppose to, then there is a lack of power or the converter needs to be restalled.

 

I talked to them about it and they just brushed me off. The guy said that it was because of the large diameter even though I send him Log files proving it wasn't flashing right

 

Checked out both. Torque management seems to be ok, do not see any timing being pulled for torque management when you attempted to do the burnout. However that being said, have no idea why anyone would want to delete the MAF and tune speed density with a setup such as yours. 31s to 37s are a big difference, but 3.73s vs 4.88 more than level that out. 31.5 vs 36.5 is 14.7% difference. 3.73 vs 4.88 is a 26.7% difference. What that means is you are putting more torque to the pavement with 37s and 4.88s than you would with 31.5s and 3.73s.

When you power braked it, the air/fuel ratio was commanding around 10.5:1, While not ideal, it is not a huge reduction in power. Timing was holding about 23* BTDC. Doubt you could find another 10-15 ft/lbs there, if the wideband is matching the commanded air/fuel ratio.

Converter is my suspect at this point if the engine is on all 8 and the cam is degreed in correctly. The engine is just not making enough torque at 2,400 rpm to stall the converter higher as it is setup.

I tow a travel trailer with a 2,800 rpm converter in my 4L85E. Actually prefer towing with such a converter over a stock converter. More torque multiplication to get you rolling and with a decent lockup clutch, can lock the converter once you get rolling and are under less than WOT.

 

Proves my point. I ran the same converter in my dad’s Suburban. It lost lock-up and was overheating the trans. Sent it back to them and they said nothing was wrong with it. Swapped in a stock converter and the truck’s been fine ever since. Something was obviously wrong with the converter, and i believe they lied to cover it up.

 

The original tuner said that he has run into problems relying on a 20+ year old MAF and has had them skew numbers over time after calibration so unless I wanted to buy a new one he suggested speed density.

I understand the gear should make up for absorbed torque due to tire height but it also has more traction 13'' wide nitto terra grappler has a pretty flat tread pattern lots of meat on ground.

As far as AFR no it is not reading what is commanded almost never that's why I never changed it back seems Lean everywhere except WOT then it's 12-13:1

I'm definitely not happy with the converter It will get changed. After I get a better tow rig I figure on getting a 3600 and more cam.

Now power wise it's a beast even with the cam tows like a dream and has definitely hurt some feelings on the highway and the looks I've gotten are priceless. Will do one hell of a donut and is scary trying to drive in the rain but won't bark a tire from a stop???

It does need work on the tune tho.

 

Does it need to be a multi disk to lock up under load like that?

 

Single disc even in a stock converter will hold it, given that the 350s, 454s and even the 8.1Ls lock the converter in 2nd gear and hold lockup on the 2-3 and 3-4 shift above 3/4 throttle on the stock tune.

I lock my single disc under load behind my 383 making alot more low-midrange torque than your 5.7L towing my travel trailer. Mine is a stock diameter converter with a billet front cover and a wider single lockup clutch.

 

did we ever try the revision 3

 

I tried it. It cranked at 14.7, then leaned out 17-18:1. I only tried it twice. The displacement was wrong again. This thing is a 5.7L , 346ci. I don't know how much of a difference that makes, but I'm sure it's something. I logged it, but I haven't had time to change my channel configuration. It would be awesome if someone would post one.....wink wink