Bad 60 foot and poor ET with a 80 compared to Th400
08-29-2017, 09:10 AM
#21
I'll chime in with some data. I had a 2800lb turbo car with a 5000 stall from Jakes and a stage 3 kit installed into an 80e done by myself. Car liked to leave in the 3600 range. Most all that season 1,50 sixty foots were normal and as I worked with suspension I was able to make an nice 1.31 sixty foot, 5.59@131 1/8th mile with a 8.53@168 1/4 mile
Switching to a Glide over the winter at the same boost pressure my sixty is still the same ut dropped et to 5.40 and 8.28. But the chassis has gotten better and a little lighter
Switching to a Glide over the winter at the same boost pressure my sixty is still the same ut dropped et to 5.40 and 8.28. But the chassis has gotten better and a little lighter
08-29-2017, 11:47 AM
#23
While this is true and there are cars in the 7s with the 4L80, it is still slower than the more efficient units in lower powered cars for sure. For me, the 4L80 shines because of its power handling capabilities. In big power applications the parasitic losses can be a fair trade for the OD.
08-29-2017, 01:32 PM
#25
I think much of that will depend on the torque converter calibration. Because of the 4L80s increased charge pressure, the stall converters tend to be tighter stall for stall in a 4L80. So, if you can get the stall right, maybe only a .1 to .15 slower.
08-29-2017, 06:37 PM
#28
Lockup units pressure changes but not when it would affect stall.
That said, you won't see a change in stall speed between 40-100 psi. Only in a big power combo (1500+) when you drop below 30-35 have we seen any increase in stall.
If the converter is full of fluid and it has some pressure, it won't change. Big power combos can push the fluid out faster than they can fill and this is when stall goes up.
I know Lonnie well and I think you have probably misunderstood something he told you.
08-29-2017, 07:47 PM
#29
Charge pressure varies between 40-70 psi on all of them. TH400 will see higher pressures when setup with fixed line pressure in some cases.
Lockup units pressure changes but not when it would affect stall.
That said, you won't see a change in stall speed between 40-100 psi. Only in a big power combo (1500+) when you drop below 30-35 have we seen any increase in stall.
If the converter is full of fluid and it has some pressure, it won't change. Big power combos can push the fluid out faster than they can fill and this is when stall goes up.
I know Lonnie well and I think you have probably misunderstood something he told you.
Lockup units pressure changes but not when it would affect stall.
That said, you won't see a change in stall speed between 40-100 psi. Only in a big power combo (1500+) when you drop below 30-35 have we seen any increase in stall.
If the converter is full of fluid and it has some pressure, it won't change. Big power combos can push the fluid out faster than they can fill and this is when stall goes up.
I know Lonnie well and I think you have probably misunderstood something he told you.
08-29-2017, 09:33 PM
#30
Maybe. You might open the subject with him sometime. Converter companies have told me this too. And, I personally went from a TH200 4R to a 4L80 with same converter specs and the stall difference was night and day. Even loosened up that converter is still tighter than it the equivalent model was in the TH200.
If it changes, something in the build changed.
We build converters at my shop too. We don't vary the build specs because the transmission model changes.
08-29-2017, 09:40 PM
#31
If you build two converters for different transmissions, and use the same combo of stator, turbine, impeller, and internal clearances, the stall will be the same within a few rpm.
If it changes, something in the build changed.
We build converters at my shop too. We don't vary the build specs because the transmission model changes.
If it changes, something in the build changed.
We build converters at my shop too. We don't vary the build specs because the transmission model changes.
09-01-2017, 10:22 PM
#34
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I don't think anyone said it was stronger. It's as strong as a 400 W/OD.
REDSS, What diameter was the 400's converter and what was the 80's?
Did you try to have the 80's re stalled?
REDSS, What diameter was the 400's converter and what was the 80's?
Did you try to have the 80's re stalled?
09-01-2017, 10:26 PM
#35
