Hur mycket effekt pallar automatlådan på en 740 TIC -88?

Kopplingar, drivaxlar & växellådor
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^MeTaNoLiC^
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thanx a lot, great info :thumbright: I will try these modifications for sure..
linuxman51 skrev:Sooner the line pressure is up the more pressure is applied to keep the clutches engaged, the less likely it is to slip as much. its the slipping in between shifts thats partially responsible for wearing the transmissions out at higher power levels.
ok, that's what I thought..
linuxman51 skrev:The A341e from the 960 is the same basic transmission as the mk4 supra turbo, if one made a bellhousing for that, you could put that transmission behind a redblock, after some modifications it could hold a lot of power.
earlier today someone told me that i should get an mk4-transmission. What a coincident! ;)
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Turbotarzan
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Inlägg av Turbotarzan »

linuxman51 skrev:
^MeTaNoLiC^ skrev: very interesting :) in what position should the pistons be locked och what is the best way to lock them?
does one have to be a rocket scientist to find the ports in the valve body or does it become obvious when you take it apart?
You need to know what to drill, there are lots of holes in the valve body plate.
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In this picture, the two circled in red would be for the 1-2 shift and then the 2-3 shift, those holes would be drilled a bit larger, but not bigger than the checkball unless you plan to remove the ball.

I locked my accumulators so that they had ~ 1/8th of an inch or about 2mm of movement down. You can use anything.

sounds good but what different does it make in reality?
Sooner the line pressure is up the more pressure is applied to keep the clutches engaged, the less likely it is to slip as much. its the slipping in between shifts thats partially responsible for wearing the transmissions out at higher power levels.
linuxman51 skrev:I do not have pictures of these modifications
:( aah well, text is better than nothing :thumbright: most swedes are too stupid to realize the benefits of an automatic transmission = the general knowledge is very low over here :doh:
Well, after spending some time looking at the AW7X transmissions, more to satisfy my own curiosity, I've come to the conclusion that most people want nothing to do with asin transmissions. Not sure why really, they're great transmissions and have a lower friction design than most GM transmissions.

The A341e from the 960 is the same basic transmission as the mk4 supra turbo, if one made a bellhousing for that, you could put that transmission behind a redblock, after some modifications it could hold a lot of power.[/quote]






Hey!
Searched the net for info on my ZF (4HP 22) automatic gearbox when I came across thiss thread.
I got the feelin' that you guys know what you're talking about so I thought I'd drop you a few questions:

The ZF Aut.Gb. from my -88 745 TIC, is it good or anus? I know the manual ZF gearboxes are pretty good but have no info on the automatics.

Is it possible to "prepp" the ZF in the same fassion as the AW 71 according to this thread?

If not, dare I use it original behind a 300hp B230ET in a 800kg(aprox 1700 pounds) heavy Triumph Spitfire?

Can i do anything else to make the gearbox last longer?

Any usefull info is accepted.
Thanx!
/TurboTarzan
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olavxxx
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oil cooling is very important with high power automatic :-)
Turbotarzan
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olavxxx skrev:oil cooling is very important with high power automatic :-)
I do have oilcooling. But should i install an extra cooler or is that going to keep the oil cold as Vanilla Ice? I heard the latter is not good at all...
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linuxman51
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Inlägg av linuxman51 »

Turbotarzan skrev: Hey!
Searched the net for info on my ZF (4HP 22) automatic gearbox when I came across thiss thread.
I got the feelin' that you guys know what you're talking about so I thought I'd drop you a few questions:

The ZF Aut.Gb. from my -88 745 TIC, is it good or anus? I know the manual ZF gearboxes are pretty good but have no info on the automatics.

Is it possible to "prepp" the ZF in the same fassion as the AW 71 according to this thread?

If not, dare I use it original behind a 300hp B230ET in a 800kg(aprox 1700 pounds) heavy Triumph Spitfire?

Can i do anything else to make the gearbox last longer?

Any usefull info is accepted.
Thanx!
/TurboTarzan
People do build up the ZF transmissions, I personally have not seen one and I understand they are quite a bit more 'finicky' when it comes to operation and maintenance.

The same basic tricks however would probably work on the zf as well. I can't even guess as to what kind of power the zf would withstand, I would suggest that you get an AW71 if you'd like it to be an automatic.
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Lunkan
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Inlägg av Lunkan »

I had a stock ZF 4HP22-EH in my BMW 735i turbo -88 around 330 rWhp before it began to slipp in 3:rd & 4:th gear. with 400000km+.

It's a electric hydralic (-EH) gearbox = controll unit.

/Jonas
Turbotarzan
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Lunkan skrev:I had a stock ZF 4HP22-EH in my BMW 735i turbo -88 around 330 rWhp before it began to slipp in 3:rd & 4:th gear. with 400000km+.

It's a electric hydralic (-EH) gearbox = controll unit.

/Jonas
I'll have to check for the EH, mine was from an -88 volvo 745 tic, should be the same one would think;)
Mine is not gonna push a bigass 735 tho'... Kurb weight is 715kg and tax-weight is 840kg in a stock 1964 Triumph Spitfire...
What the hell is Kurb Weight BTW? Said so on an Enthusiast-page i found. Is it when the car is stripped from fluids or what?
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Volv8
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linuxman51 skrev:
stadigare lammelpaket
Not sure what that means, however-

AW71 and AW72 are both Asin A43D/DL transmissions.

The differences between a 71 and a 72:
Gear ratios
Governor spring pressure (controls shifting when transmission is in "D")

They use the same clutches and the same number of clutches in both transmissions. There might be some very small differences in the spring rates used in the shift valves.

An Aw71 is probably a stronger transmission, as the aw72 uses a slip on gear 'collar' going into the planetary gears coming out of the center brake cluster, the aw71 uses a solid one-piece gear for this part of the assembly.

AW71 gear (top right corner of the bin)
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can't find a picture of the aw72 gear :doh:

Anyway, to get one to last longer behind a stronger volvo motor, you will need to lock the accumulators (the three pistons in the case)

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This will cause the transmission to shift 'quicker', no lag between gears. There are also ports in the valve body that can be drilled out to make it shift harder, as well as cause it to run full line pressure before full throttle. I do not have pictures of these modifications.

Also, manually upshifting the transmission is probably better for it as well, since it forces fluid to travel through fewer parts of the transmission.
How about the AW-70L? I´ve heard that the AW-70L is a "Light-Duty-version" of the AW-71 that is suppose to be an "Heavy-Duty" transmission?

What is your opinion?

And do you know how much horsepower and torque the AW-70L can withstand?
744GL -85 AW-71, B230A
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Dennis Öhman
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So, when you lock the accumulators.. what did you use?? can you get me some pictures of how it was done?
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Karl Buchka
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Dennis Öhman skrev:So, when you lock the accumulators.. what did you use?? can you get me some pictures of how it was done?
http://forums.turbobricks.com/showthread.php?t=108965

http://forums.turbobricks.com/showthread.php?t=116116

http://forums.turbobricks.com/showthread.php?t=170176
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Dennis Öhman
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Hitta det på turbobricks, Fick även andra tips hur man kan göra.. Blir automat i andra bilen nu..
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