Lets talk stall converters

[33IMP]

No stall it wouldn't rev finished the meet by neutral start asked for permission to be allowed to do it that is one real hard launch like a 4sp car. didn't have roller clutch issues either as the Chrysler manual valve body was low band apply in first.

I'm surprised they gave you permission! I love my transbrake, it does leave like a neutral drop.

 

[Alfajim]

AHH! thank you.... i have been hunting the problem in my car.. brand new converter, drags the motor way down and has almost no stall and the car doesn't want to move easily... dropping the trans when i get home to put in a new PTC.. seems not many people have had a sprague break so was hard to diag it..

Yeah it was weird run before was just fine pulled up to do burnout and it started to move and then nothing head scratcher? Tried again then just did a neutral start that was OK and made run that was and then got ok to do it the rest of the meet just two more runs.

 

[Alfajim]

I'm surprised they gave you permission! I love my transbrake, it does leave like a neutral drop.

This was back in the old days and also at Salt Lake and I had a pretty big following because of that car nothing else like it up there back then.

 

[Icetech]

ok.. since we on converter talk... i jus pulled my trans.. swapped converters and put it back in... getting the converter in. under the car with no room was a battle that i'm praying the front seal survived.... BUT.. old converter, stuck my finger in and could barely get it to move and felt chunky... new one feels tight but smooth and would turn nice.. worrying though it this.. these marks are barely enough to feel with a nail, barely... i ran a scope into the front of the pump, bushing and pump to converter teeth look fine.... not sure how much i should be worried bout this.. and i don't think whatever it is could have hurt the old converter..

This is after maybe 4 hours run time..

 

[Alfajim]

ok.. since we on converter talk... i jus pulled my trans.. swapped converters and put it back in... getting the converter in. under the car with no room was a battle that i'm praying the front seal survived.... BUT.. old converter, stuck my finger in and could barely get it to move and felt chunky... new one feels tight but smooth and would turn nice.. worrying though it this.. these marks are barely enough to feel with a nail, barely... i ran a scope into the front of the pump, bushing and pump to converter teeth look fine.... not sure how much i should be worried bout this.. and i don't think whatever it is could have hurt the old converter..

This is after maybe 4 hours run time..

View attachment 1716403673

Is the pump bushing brass or teflon coated if brass I wouldn't worry to much as the witness mark is not excessive sort of normal for breakin, if teflon maybe some junk was in the lube used before converter was installed.

 

[Icetech]

Is the pump bushing brass or teflon cted if brass I wouldn't worry to much as the witness mark is not excessive sort of normal for breakin, if teflon maybe some junk was in the lube used before converter was installed.

brass.. they have teflon bushings? i have seen teflon sealing rings but no idea how a teflon bushing would work

 

[Alfajim]

brass.. they have teflon bushings? i have seen teflon sealing rings but no idea how a teflon bushing would work

It's common in GM trans it's a brass bushing with a thin sprayed overlay of teflon they are gray in color and pebbly in surface texture. There shoud be an aftermarket HP one out there somewhere.

 

[Icetech]

It's common in GM trans it's a brass bushing with a thin sprayed overlay of teflon they are gray in color and pebbly in surface texture. There shoud be an aftermarket HP one out there somewhere.

ah cool.. i have only ever seen brass.. i'm a caveman

 

[Alfajim]

ah cool.. i have only ever seen brass.. i'm a caveman

 

[Icetech]

Pulled the trans and swapped the converter yesterday... car drives like a car should now.. Not sure if i will send the FTI back for repair or trash it.. depends on cost and if i could resell it to make some of the money back

 

[Bobzilla]

Pulled the trans and swapped the converter yesterday... car drives like a car should now.. Not sure if i will send the FTI back for repair or trash it.. depends on cost and if i could resell it to make some of the money back

Send it back and get it fixed. It will be basically brand new once fixed. Then you can recover some of the cost. Let them know the new converter fixed the problems and they may cover the shipping cost.

 

[Icetech]

Send it back and get it fixed. It will be basically brand new once fixed. Then you can recover some of the cost. Let them know the new converter fixed the problems and they may cover the shipping cost.

Will email them later... I need to get my 360 block to the machine shop already... would like to get the new motor in before winter

 

[Newbomb Turk]

Pulled the trans and swapped the converter yesterday... car drives like a car should now.. Not sure if i will send the FTI back for repair or trash it.. depends on cost and if i could resell it to make some of the money back

What does the new converter do (or what does it not do) that shows improvement over the FTI?

Articulating it will help future converter buyers to understand why the correct converter is worth the money.

 

[Icetech]

What does the new converter do (or what does it not do) that shows improvement over the FTI?

Articulating it will help future converter buyers to understand why the correct converter is worth the money.

I believe had posted it above.. the old converter was a 3200-3400 9.5" FTI.. it was stalling around 800rpm and had no tq multiplaction, When you would take off the car felt like it was fighting against itself to move. Like it had stuck brakes. New one stalls much higher (no tach installed right now) and the car actually drives like normal and while while it's not fast it is at least driveable.

This vid is with the broken converter, you can hear that it does is pretty much direct drive right away. Supposedly it's cause by a bad spraque inside which cause it to fluid couple instead of move freely.

 

[M_Body_Coupe]

Do you have a chassis dyno near you? I actually think a 3000 stall is a bit much for your combo with only 218@050 on the cam. I think a tight 26-2800 would be acceptable and drive excellent.

I didn't see much (any?) follow-up to TT5.9mag's respone above, but I think he's spot on.

3000 stall, even on a tight converter will do precisely what for this combination?

For comparison, I used to run a 238/244@0.050" lift cam (Hughes HE3844AL) hydraulic flat tappet in a 360 motor. 4.10 rear end, 727, and going from 2800 to 4000 (9.5" Dynamic) made a "Day & Night" difference. That's in a 3600 lbs car.

OK, but that's about 20deg more duration at 0.050" (compared to OP's 218/224 @ .050” cam), which really needed the extra stall.

Further on, currently in my 408 W2 stroker I run a CompCams hydraulic roller (XR292, but on 112 LSA) and that has the converter stalling at about 4200-4300.

Soooo....back to the OP's combo: didn't see any gearing listed (sorry if I missed), but a 3000 stall converter will blow those tires off and well, smoke show aside, you're not going fast anywhere!!!

 

[Dusty 997]

I didn't see much (any?) follow-up to TT5.9mag's respone above, but I think he's spot on.

3000 stall, even on a tight converter will do precisely what for this combination?

For comparison, I used to run a 238/244@0.050" lift cam (Hughes HE3844AL) hydraulic flat tappet in a 360 motor. 4.10 rear end, 727, and going from 2800 to 4000 (9.5" Dynamic) made a "Day & Night" difference. That's in a 3600 lbs car.

OK, but that's about 20deg more duration at 0.050" (compared to OP's 218/224 @ .050” cam), which really needed the extra stall.

Further on, currently in my 408 W2 stroker I run a CompCams hydraulic roller (XR292, but on 112 LSA) and that has the converter stalling at about 4200-4300.

Soooo....back to the OP's combo: didn't see any gearing listed (sorry if I missed), but a 3000 stall converter will blow those tires off and well, smoke show aside, you're not going fast anywhere!!!

3.73 rear gears

 

[M_Body_Coupe]

3.73 rear gears

OK, I would say a nice modern 2800 stall would be plenty enough...with that gearing you could even do something like a 2600.

 

[Illahe]

For what it's worth.... a cheap converter was the single WORST purchase I have ever made, in fifty years of hot rodding.

Agreed. I ran a B&M converter in the late eighties and it was like stepping on a hot marshmallow!