Does 'coupling' degrade?

[SSchmi5519]

Wondering if the coupling characteristics of a converter will slowly degrade over time or is it all at once when you fry the converter?

When its locked its great, at light throttle its great.

Its the heavy part throttle where i have tons of rpm and boost, just feels like im not going anywhere with that power like i used to.

Is it in my head Mike?


Sent from my iPhone.

 

[Mike L.]

Wondering if the coupling characteristics of a converter will slowly degrade over time or is it all at once when you fry the converter?

When its locked its great, at light throttle its great.

Its the heavy part throttle where i have tons of rpm and boost, just feels like im not going anywhere with that power like i used to.

Is it in my head Mike?


Sent from my iPhone.

Your converter is not the best coupling converter out there and you are probably making more power now and it's showing up in the converter. Coupling does not deteriorate unless the stator or turbine start losing fins in which case you will know very soon.
A good test is to take your truck up to 30-35 mph and roll into the throttle quickly without making it down shift. Watch the tach and the speedo needles. If the tach jumps 500 rpm without the truck responding; that 500 rpm just went out your tail pipe and did zilch.
A good coupling converter will have the speedo needle following right behind the tach needle and that will tell you that the power got to the wheels quickly.

 

[SSchmi5519]

Thanks mike. I remember you saying something about the rpm being followed by the speedo, but couldn't remember exactly how you recommended to test it. I'll try the 30 roll and try to get a video if i can't tell for sure whats going on.


Sent from my iPhone.

 

[hondarider552]

Don't forget to spray da nitrousness

 

[ikeG]

Is coupling referring to locked or unlocked performance ?

 

[SSchmi5519]

Is coupling referring to locked or unlocked performance ?

Unlocked. There should be no slip at all in lockup.


Sent from my iPhone.

 

[LBZ]

Your converter is not the best coupling converter out there and you are probably making more power now and it's showing up in the converter. Coupling does not deteriorate unless the stator or turbine start losing fins in which case you will know very soon.
A good test is to take your truck up to 30-35 mph and roll into the throttle quickly without making it down shift. Watch the tach and the speedo needles. If the tach jumps 500 rpm without the truck responding; that 500 rpm just went out your tail pipe and did zilch.
A good coupling converter will have the speedo needle following right behind the tach needle and that will tell you that the power got to the wheels quickly.

I think I need a new everything then lol!

 

[Mike L.]

I think I need a new everything then lol!

I gave you up for dead bro.:hug: You need to start moderating again. Loosen up by bitch slapping Brian for starters. Call James wife and tell her where he is spending his money.:rofl: Steve has been behaving pretty well so leave him alone.

 

[LBZ]

Ya ya I know. Been a long cold depressing winter.

 

[Chevy1925]

Now that just ain't fair. Don't make all three of us come out there and let all your sheep out of the pens. They may just come home with brian

 

[hondarider552]

I'm so lost

 

[Hot COCOAL]

I have a similar problem, however, my speedo follows the tach pretty well under any throttle and when the converter is locked and un locked

The issue I am experiencing happens only at heavy throttle, say, 90% to w.o.t, then if and when the rear end gets "light" when going over a mound in the asphalt, or a bump big enough to unsettle the tires from the road, this is when my tach jumps and the speedo stays or slows substantially, and just as mike said, it feels like all the power just shot out the tail pipe, it feels like the converter will eventually catch up or grab if I stay in the skinny pedal, but if I let out and roll back in its fine, the problem has not gotten any worse at all, and it has been happening since day one of my built trans

Any thoughts???

 

[Hot COCOAL]

I should also note, this only happens in 5th and 6th gears, 6th more than 5th, and usually I am going pretty damn fast under heavy to wide open throttle

 

[skidoosleds3]

I have a similar problem, however, my speedo follows the tach pretty well under any throttle and when the converter is locked and un locked

The issue I am experiencing happens only at heavy throttle, say, 90% to w.o.t, then if and when the rear end gets "light" when going over a mound in the asphalt, or a bump big enough to unsettle the tires from the road, this is when my tach jumps and the speedo stays or slows substantially, and just as mike said, it feels like all the power just shot out the tail pipe, it feels like the converter will eventually catch up or grab if I stay in the skinny pedal, but if I let out and roll back in its fine, the problem has not gotten any worse at all, and it has been happening since day one of my built trans

Any thoughts???

Maybe it's going into neutral for a split second to save itself??

 

[Slammed2007Lbz]

I have a similar problem, however, my speedo follows the tach pretty well under any throttle and when the converter is locked and un locked

The issue I am experiencing happens only at heavy throttle, say, 90% to w.o.t, then if and when the rear end gets "light" when going over a mound in the asphalt, or a bump big enough to unsettle the tires from the road, this is when my tach jumps and the speedo stays or slows substantially, and just as mike said, it feels like all the power just shot out the tail pipe, it feels like the converter will eventually catch up or grab if I stay in the skinny pedal, but if I let out and roll back in its fine, the problem has not gotten any worse at all, and it has been happening since day one of my built trans

Any thoughts???

Its called breaking traction or spinning the rear tires:hug:

 

[PACougar]

Its called breaking traction or spinning the rear tires:hug:

he's never had the power to spin the tires before

 

[Hot COCOAL]

Tonight (since my last post) for some reason, i decided to run my street performance tune, instead of the race tune, and I rolled into it as mike had suggested from 30-35mph on up in 4th and the tach and speedo moved pretty much in unison. Then I did it in sixth from 52mph on up, and the trans didn't skip a beat, no slipping of the converter or flare or whatever it was occurred, and actually it seemed like the speedo moved about two or three times as fast as the rpm did( in 6th gear) and the tach never "jumped" Also the shifts didn't defuel as drastically as they do in the race tune. I wish I were closer to a good duramax shop that had a dyno and tuning tools I would sure Like to get this truck totally dialed in....someday

Tomorrow I will try it again, but in the race tune, and also in 5th at a higher rpm, I think I am starting to narrow down the instant this little issue is happening, even though I don't have a clue as to what is really going on I thought it was happening in 6th more than 5th, but now I think it is happening more, and maybe only, at the top end of 5th?

Could it be a matter of not having enough line pressure being applied, or even commanded? Which of the titles in the scan function of an auto cal would give me this info? How much line pressure is being commanded and applied. I think it's in there I'm just not sure which one it is?

Any help is appreciated, thanks

 

[Hot COCOAL]

he's never had the power to spin the tires before

:spit: :roflmao:

You're such a bitch:booty::bootyshake::nunck::buttkick:

:hug:

But you're right, not in 5th and 6th gear anyways

 

[PACougar]

:spit: :roflmao:

You're such a bitch:booty::bootyshake::nunck::buttkick:

:hug:

But you're right, not in 5th and6th gear anyways

To be fair, the first time I lit up the back end at over 100mph I wasn't sure what was going on either

 

[Hot COCOAL]

I wish that was what is going on, but it's not if I hit a bump at wot, the rear end gets "light" or un settled, and the tach just about red lines and you can feel the power fall off, and the tire aren't spinning:hug: but I wish they were:rofl: