auto trannys and black boxes??

[Bill Kondolay]

Ron,

When selecting power upgrades for your Ram you may want to consder the following.

When you add off/on power switches the transmission settings are different for each position. Wide open throttle shift points very according to hp. An example is with the power turned off, your wide open can be set at 3100 and with the power turned on, wide open throttle can be as high as 3400 with the same transmission settings.

In order to get your shift points accurately with the power turned on you must move the kick down cable forward but by doing so you will be sacraficing transmission line pressure. Not only does this lower your line pressure at light throttle driving but also under full throttle.

When setting up a vb in a ram using this type of off/on power it is very tricky and requires a great deal patience on the technicians part, as it sometimes requires several pan removals to get the correct combination.

For most people i recommend using a fixed hp setting as it much easier for vb tuning,
unless the technician working on your truck is willig to go the extra mile, or you are prepared to do all the fine tuning yourself

As far as the pressure loc is concerned, i know what the ads say but here is my intrepretation on how the system works.

Ron, lets use your truck as an example.
Pretend we bolted the pressure lock onto your truck

(pressures may vary by 5psi or so. )

TPS-------STOCK VB------------ PRESSURE LOC
--------------------------------ON STOCK VB

IDLE-----------55PSI -------------55PSI
1/4------------60------------------60
1/3------------65------------------65
1/2------------70------------------70
3/4------------80------------------80
FULL----------100-----------------100

IN LOCK UP

1/4------------68------------------88
1/3------------72------------------88
1/2------------82------------------88
3/4------------88------------------88
FULL----------100-----------------100

A pressure loc will offer very little protection with a stock vb. On high hp trucks requiring higer overall line pressure through out all gear ranges, with lockup engaged or dis-engaged it serves even less purpose.

Bill Kondolay
Diesel Transmission Technology



[This message has been edited by Bill Kondolay (edited 01-14-2001). ]

 

[pwr2tow]

Need input from knowledgeable auto transmission and fueling inhancement guru's. I have a theory and need some input. From what i have read my understanding is that the auto transmission clutch ingagement and pressures are regulated by the TPS or throttle position sensor, hence the more you push down on the throttle the more pressure applied to the clutch pack. If this is correct then wouldn't it be wiser to have a fueling box that brings in fueling at half throttle or maybe even three fourths throttle to help bring pressures up first before all the extra HP and that would help keep the transmission from slipping and transmission failure. I know from experience that adding more HP I can drive at same speeds with the throttle less then what it was before the HP improvements. If my theory is correct can we somehow adjust some thing to bring up transmission line pressure sooner to help avoid slippage. I know some of the boxes out there bring on fueling later and are adjustable, are these better suited for auto transmissions, in my opinion yes. Alot of auto drivers could benifit from this information. Regards, Ron

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1999, 3500, 6x6, slt, auto, 3. 54, Qd cab, ISB cummins, towing 2001 26RKSS Tahoe 5th wheel, 1999 120hp 1800 bayliner.

 

[arlan]

Modified valve bodys and or the B-D pressure lock address this problem.
Arlan

 

[Mopar-muscle]

yes arlan is correct ron , this has been addressed , raising the line pressure higher than stock takes care of part of the problem , and there is some delay built into the boxes , the PE is boost sensitive , the ez edge is also , the blue box has a delay built in . not sure about the VA , it seems to add power from the get go . the pressure lock does move the TV lever to increase line pressure when the TC is locked and possibly while unlocked (??) , DTT builds the basic principle of the pressure lock INTO the valvebody , something not done on the OTHER VB or with shift kits , why build it in for a fraction of the cost when we get alot more money for the pressure lock ?? oops did i type that ???

[This message has been edited by Mopar-muscle (edited 01-16-2001). ]

 

[arlan]

Mopar,
I almost typed that but,... ...

 

[pwr2tow]

Hi Bill, If i move the kick down cable rearward would it improve the line pressure and what would it do to the shift points, or am i flirtting with danger. I triple trail the setup in my signature and when i tow i never use wot to gain speed, maybe 3/4 throttle or a little more, am i doing more harm by useing 3/4 throttle instead of wot. Also i tow out of OD until i reach the speed limit then into OD i go. Your figures show just what i was trying to say more HP=less throttle=less line pressure=slipping clutch packs, something every auto trans owner should be a where of. I plan on installing your VB this spring and maybe the TC too, is there a reliable transmission shop in eastern ND. Thanks again for you help. Regards, Ron

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1999, 3500, 6x6, slt, auto, 3. 54, Qd cab, ISB cummins, towing 2001 26RKSS Tahoe 5th wheel, 1999 120hp 1800 bayliner.