converter not locking

[mainer]

1050 suncoast with like 7k on it since rebuild


when going 60 (not in tow haul) 5th gear locked and then go wot, unlocks downshifts to 4th and just sits on rev limiter at 3600 rpms until 75-80mph when it shifts to 5th and then immediately locks. it pulls good while its unlocked and doing this but just will not lockup.

same thing if i'm going 20 mph or similar speed and go wot it just holds 3600rpms and goes up through the gears until 75-80mph and then shifts to 5th and locks.

converter seems fine in tow haul, locks as it should etc


any ideas??? this is on a truck with very fast spooling twins and a approx 500whp tune

 

[DMAXchris]

Join the club. Mine wont lock until 4th on the track.
My idea is get a different converter.
I have a 1054, btw.

 

[duratothemax]

foster try running a 2005 TCM OS. The later LLY TCM OS's will NOT unlock the converter on a WOT kickdown. The early TCM OS's, if you are on the highway, and go to pass, floor it, downshifts to 4th and simualtaniously unlocks the TC, then does that MOST ANNOYING THING EVER IN THE WHOLE DAMN ALLISON TCM (waits until tcc slip rpm is below a certain value before allowing the converter to relock), then relocks the converter, then when the 4-5 WOT shiftpoint is reached, shifts back into 5th.

Seems your converter is loosening up....thus with your big power, its blowing thru the converter and crossing into the "lockup inhibit" slip rpm range.

Ive been saying it for 3+ years (and nobody listened to me/acknowleged it as a problem) "I dunno ben your truck must be broken or YOU'RE screwing something up, my tc locks". Now all of a sudden lots of people are seeing it and finally agreeing with me, maybe im not so stupid after all.....if EFILive can find that table that inhibits lockup over X slip rpm, I will never ask for anything from them again.

That is the single most important table in the entire TCM as far as im concerned. Who gives a crap about changing shiftpoints and stuff when the converter wont even lock at wide open throttle.

I recently paid suncoast 350 bucks for what I was TOLD was a "refresh". Apparently there is some misunderstanding what a "refresh" is because this piece of shit they gave me back is already loosening up (to the point where the TCM wont lock at WOT anymore) after only 7 months or so.

ben

 

[DMAXchris]

I dont think you're stupid Ben. :hug: I didnt notice it until I had it pointed out to me. Then I thought....this aint right. TCC should be locked in 2nd @ WOT.

Is the problem only with suncoast or is it a TCM issue?

EFI crew, Please find this table for all of us before next racing season.

 

[mainer]

is suncoast having wide spread issues with converters loosening up?? are fins bending etc??

my converter only has like 4 passes on it.... and maybe 4-5 launches on the street, never seen tranny temps over 190* etc, certainly hasnt seen much abuse

 

[wkinsley04]

I don't personally think it is a loosening up issue. i don't know what the problem is but i know my 1054 has had the same problem since day 1. anytime i go WOT my converter won't lock until 4th.

 

[Randy5.0]

I don't personally think it is a loosening up issue. i don't know what the problem is but i know my 1054 has had the same problem since day 1. anytime i go WOT my converter won't lock until 4th.

X2. My 1054 did the exact same thing on the very first pass at the strip. I don't think its slowing me down much, but I would like to see what difference lockup in second would make. It would be more consistant too, I would think.
How can we get the EFI crew to find that table Ben? I know they're busy, but I really think its important.

 

[Mike L.]

Funny thing is that the factory converter is the looset unit out ther and it locks just fine under command. Think about it.

 

[Randy5.0]

Are we barking up the wrong tree? Let us in on it dude, or at least give us one more clue to point us in the right direction.:secret:

 

[duratothemax]

it is a TCM issue. I have logged it on about a dozen trucks. The command simply is not given with big power/greater than 500 or so RPM slip (difference between turbine vs. input speed)

 

[Bako_Dmax]

My converter locks every time from 300hp-600+, dont remember having any locking issues w/ the stock converter either running my McRat tune.

 

[duratothemax]

My converter locks every time from 300hp-600+, dont remember having any locking issues w/ the stock converter either running my McRat tune.

how do you know? Show me a trans log and Ill believe you. 75% of the people who have this problem dont even know that they have it.

ben

 

[Mike L.]

how do you know? Show me a trans log and Ill believe you. 75% of the people who have this problem dont even know that they have it.

ben

Do it with a Tech 2 Ben. Also tell me why a stock converter locks. I just tested a single disc 8.1 converter that was sent by mistake and with my moonshine tune it locked normal and I will bet my power is over 500 hp. This converter was as loose is you can get.

 

[Randy5.0]

Do it with a Tech 2 Ben. Also tell me why a stock converter locks. I just tested a single disc 8.1 converter that was sent by mistake and with my moonshine tune it locked normal and I will bet my power is over 500 hp. This converter was as loose is you can get.

Were you in 2WD or 4WD? If your tires spin and you defuel at all, it will lock, I did a boosted 4WD launch on the street and it spun the tires instantly, defueled, locked up in second, and took off hard. I have a log of this run to back this up. I really dont know what would cause this, but it could be the missing table Ben is looking for. When the defuel occurred, maybe the %slip rpm fell into the correct range. I dunno.

 

[duratothemax]

here are some logs that show at least 3 seconds passing from when I go WOT to when the converter locks (or when the command is given)

Once the command is given, it then takes another 1.5-1.75 seconds to actually fully lock. Even back in early 2006 on a single CP3, fuel only, my 7,600lb crew cab trapped 108mph. But never ran faster than 12.9 due to converter lockup issues. It ran basically the same 1/8 mile time as a stock LBZ.

 

[Bako_Dmax]

how do you know? Show me a trans log and Ill believe you. 75% of the people who have this problem dont even know that they have it.

ben

Ill get right on that, cause what matters most is if you believe me.:hail2:

 

[duratothemax]

Ill get right on that, cause what matters most is if you believe me.:hail2:

I didnt mean that to come off like it did. :

Maybe the 6-speeds are a little different? I dont know...but every 5-speed, I can at least count to 2 or 3 from when the converter is supposed to lockup (as soon as you go WOT) to when it actually does.

ben

 

[Bako_Dmax]

I didnt mean that to come off like it did. :

Maybe the 6-speeds are a little different? I dont know...but every 5-speed, I can at least count to 2 or 3 from when the converter is supposed to lockup (as soon as you go WOT) to when it actually does.

ben

No worries. Ill get a log for you to check out the next time I get a chance. :thumb:

 

[mainer]

Funny thing is that the factory converter is the looset unit out ther and it locks just fine under command. Think about it.

under command.....


so why isnt it being commanded?? this seems to be the issue that most of us are having, its not an issue of the converter not being able to lock but that it isnt being commanded to lock

 

[duramaximizer]

Ben can you tell me all of the PIDS you are logging, because I want to try it on my LMM to see what my converter is doing. Some of the PIDS don't seem to work right. Just wondered if you had messed with the LMM ally pids.

Thanks,

Adam