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Re: anyone here run a 4l80e?
[Re: neilaf]
#1418648
03/20/15 04:20 PM
03/20/15 04:20 PM
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Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
slammedR/T
super stock
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super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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Quote:
We are talking a much higher stall many cars come with just over 2000 so 2800 is close to stock
stock stall speed in that truck is 1400, it now has a 2800 stall converter.
Ok here is another example, how do all the drag week guys not blow up they transmission driving 1000 miles on the interstate with a high stall converter? How does my 4500 converter not kill my 727 in my R/T when I drive it 60 miles on the interstate to the track, race it, then drive it 60 more miles back home??? trans temp never gets over 180 while cruising on the interstate? Ever had a car fell like the transmission is slipping and it turned out to only be a bad tune on the engine?? A torque converter does just that converts torque, when you are on the interstate cruising to torque applied is lower than when you are leaving a stop light.
think aboput a fan blowing another fan to turn it, it is easier to blow the fan when it is already spinning than to blow it moving from a dead stop.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: anyone here run a 4l80e?
[Re: slammedR/T]
#1418649
03/20/15 04:43 PM
03/20/15 04:43 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Where are you measuring your trans temp?
Sump? Or the line going into the cooler?
Cooler-in will always be a lot hotter and vary more than sump temp.
The thing with converters is they have a slope to their slippage, they aren't on/off, so the slippage is constantly changing due to changes in input/output speed or torque input.
Even if the slip % is the same between 2 sets of operating conditions, if the torque (either input or output) is different, the heat generated is different.
And as the input temperature into a cooler increases, so does its efficiency. So you might add 20° going into a cooler from more slippage, but teh cooler might take 13° of it back out (7° increase on the gauge). But if you add only 10° maybe it only takes 5° out, a 5° increase on the gauge. (hypothetical #s to illustrate my point).
But the bottom line - if it works, it works, and there are then obviously more things going on than just common internet theory.
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Re: anyone here run a 4l80e?
[Re: FastmOp]
#1418651
03/20/15 06:55 PM
03/20/15 06:55 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I love the mopar 5 speed auto in the 6.1 cars. The new 8 speed sounds like more of a good thing.
I really like my 518.. I did loose the lock up due to
I wanted a high stall conv.. but the OD is great.. and
its a mech OD with a switch.. I can leave it on all
the time or not and switch it on for the E-way.. with
.69 OD it does drop the rpm which is nice.. 2900
rpm at 75 mph... I do wish I had a bit less slippage
but thats what I get with a 5000 stall on the street
but I do monitor the sump temps but hasnt been a problem
but I need to test in high summer temps.. I have
another cooler with a fan I can put on it if needed
and that would be on a thermo switch for the fan
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Re: anyone here run a 4l80e?
[Re: MR_P_BODY]
#1418652
03/20/15 08:16 PM
03/20/15 08:16 PM
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Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
slammedR/T
super stock
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super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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Quote:
Quote:
I love the mopar 5 speed auto in the 6.1 cars. The new 8 speed sounds like more of a good thing.
I really like my 518.. I did loose the lock up due to
I wanted a high stall conv.. but the OD is great.. and
its a mech OD with a switch.. I can leave it on all
the time or not and switch it on for the E-way.. with
.69 OD it does drop the rpm which is nice.. 2900
rpm at 75 mph... I do wish I had a bit less slippage
but thats what I get with a 5000 stall on the street
but I do monitor the sump temps but hasnt been a problem
but I need to test in high summer temps.. I have
another cooler with a fan I can put on it if needed
and that would be on a thermo switch for the fan
When i still had a built 46RE I was running a Precision Industries "viper" converter for my truck. 3500 stall, twin disc carbon clutch. It was just over a $1,000 but it handled the power and lived under lock-up. I had custom tunes in the truck for different lock-up at different rpm ranges or no lock up at all. If the converter lock-up happened to low in the rpm it would bog the truck down. But on the bottle it like the lock-up a little lower in the rpm than when on motor. On the dyno the lock-up and non-lock numbers was a difference of 40 whp. But I like having the lighter converter without lock-up but when i start making serious power I will want to got to a bolt together lock-up converter.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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