Talk about transmissions and converters

[twinv6gtp]

Looking to get a looser torque converter than the Aurora one for the 4t80e rear transmission. Who do you guys recommend for a top notch converter.

Jdredd, were you able to lock your converter while shifting or only after the shift with your custom 4t65-HD transmission ?
Any tips for the 4T65-HD up front as far as converter choice. The stock GTP converter seem to be pretty close to what I needed. Took about 2 seconds to build good boost but I could take slightly looser and more efficient if that's possible.

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[Xtant12]

Looking to get a looser torque converter than the Aurora one for the 4t80e rear transmission. Who do you guys recommend for a top notch converter.

Jdredd, were you able to lock your converter while shifting or only after the shift with your custom 4t65-HD transmission ?
Any tips for the 4T65-HD up front as far as converter choice. The stock GTP converter seem to be pretty close to what I needed. Took about 2 seconds to build good boost but I could take slightly looser and more efficient if that's possible.

I went with the ZZP converter with a 3000 stall

 

[The Broken Regal]

The billet custom one that TEP sells, through precision iirc... had it on my turbo car and it works great. I don't know if zzp ever said what they used in the turbo drag car (like specs), but they do drive it on the street fwiw

 

[10sec]

I went with the ZZP converter with a 3000 stall

Yeah, their converters are known to loosen up, not really good quality. Especially not for the power he's making.

 

[GTPpower]

I'd go with the precision billet converter. They are expensive, but the best.

 

[twinv6gtp]

Thanks for the tips I will check precision out

 

[Turbocharged400sbc]

yeah if we needed converters enough to drop coin on em we'd go to PI

im still hoping with the final weight and aurora converters we'll have something workable for a while before thats a restraint to going faster.

 

[Turbocharged400sbc]

make sure your contacting precision industries for the custom converter, though since you want a built 65e up front it'd probably be worth it to go through dave since he's undoubtedly wanting to tackle the 80e converter problem now that his gp is cruising with one. youd be sure to get a good solution, and the restall is quite nice in case you goof on the calculated tq/stall speed

 

[Spivitz]

Very happy with my Yank 3800... So much win

 

[jdredd]

Looking to get a looser torque converter than the Aurora one for the 4t80e rear transmission. Who do you guys recommend for a top notch converter.

Jdredd, were you able to lock your converter while shifting or only after the shift with your custom 4t65-HD transmission ?
Any tips for the 4T65-HD up front as far as converter choice. The stock GTP converter seem to be pretty close to what I needed. Took about 2 seconds to build good boost but I could take slightly looser and more efficient if that's possible.

At the time of the car actually running, I was still on a ZZP 3000 stall. Which
had bad slip once i started to get around 19psi. If I had locked it, probably
would have totally died on me.

The new conveter which has yet to be ran, can be locked in 2nd and 3rd.
But it costs $$$ and needs a spacer between motor and trans made.

In your case, you may be able to get away with a regular PI billet converter
and lock it in 3rd. They don't recommend at all doing so, but since its doing
roughly? half the work now, maybe can get away with it? I think this is what
ZZP does with their 300-400 psi line pressure.

 

[1quick]

Zzp told me to never attempt to lock there converter at all ever or it would self destruct, but you can cut power to the pressure control switch via a finger switch and default to max line pressure I noticed quite a bit of difference doing that it floods the converter and helps tighten it up alittle

 

[jdredd]

Zzp told me to never attempt to lock there converter at all ever or it would self destruct, but you can cut power to the pressure control switch via a finger switch and default to max line pressure I noticed quite a bit of difference doing that it floods the converter and helps tighten it up alittle

I forgot about that part... Thats what they had me do to my ZZP one.
I think its what was the final straw to it, as it started to whine. I
had zero gains the few runs I tried it. I think problem was for me was
I was almost to the point of max pressure anyways (going by value read
from the PCM) so flipping the switch only netted a tiny extra more.

I think problem was having it like that while just sitting there as it would
thud, but matt said they would keep it always off for race day, and their
drag car had it totally disabled. Maybe having switch to flip after say
the 1st shift to flood it while moving and flip it when done might
have helped a bit more maybe with the cheapy ZZP converter.

As for locking it, i guess its debatable. Some do it for dyno and track
runs in 3rd every so often and seem to survive. Just zero clue on
how long that luck will last with the PI converter.

 

[twinv6gtp]

I know it's popular in the 4l60 4l70 drag racing world to lock the converter with built trans/billet converters.

I always ran full line pressure so I wonder if that is why my 4t80e converter was always so tight and was hard to build boost on. Although my 4t65 stock converter was easy to build boost on and I also ran full line pressure on that transmission.

 

[GTPpower]

Dave isn't running full line pressure, and he was having a difficult time building boost as well.