Transmission Line Pressure
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Senior Member
Joined: Jul 1999
Posts: 252
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From: Baytown, Texas Harris
Transmission Line Pressure
How does line pressure affect your performance and shifting? How much is to much? Would you want different setting on different gear changes? Anyone have any answers to theses questions?
Tt
Tt
Senior Member
Joined: Jul 1999
Posts: 2,303
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From: Chesapeake, VA USA
The higher pressure increases shift firmness. I believe one of the Ford people on here said the seals and such are over engineered so the higher pressure shouldn't be a problem.
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Red '00 Lightning,
Power Surge Performance enhanced,
Sound effects provided by Flowmaster,
375 RWHP,
445 RWTQ,
13.227@103.55
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From: Virginia
Hi SVT54C,
Line pressure has a direct effect on how firmly the gear changes are made, so you can go too far, if you install a shift kit on it's highest setting, for example.
Generally speaking, you need more line pressure for each succcessive upshift into a higher gear. I.E., you need more line pressure for the 2-3 upshift than for the 1-2 upshift, as a function of vehicle velocity. The faster the vehicle is going, the more line pressure is needed (to a certain extent) to effect a positive upshift.
There are other factors that affect shift firmness however, as Ford, along with the other automakers, is using a "soft-shift" strategy to accommodate what they feel the female buyer wants, as women are buying more than half of all new vehicles sold. Ford uses a shift delay signal to elongate & soften the upsfhits, and pulling that signal helps to reduce the amount of slippage that occurs during the upshift. There are other factors that affect shift firmness as well, line pressure is just one of them.
I hope this info helps, & good luck with your vehicle.
------------------
Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com
Performance Products F150Online Superchip ordering system: F150Online Superchip Ordering System
First National F-150 Online Rally Event Organizer
Line pressure has a direct effect on how firmly the gear changes are made, so you can go too far, if you install a shift kit on it's highest setting, for example.
Generally speaking, you need more line pressure for each succcessive upshift into a higher gear. I.E., you need more line pressure for the 2-3 upshift than for the 1-2 upshift, as a function of vehicle velocity. The faster the vehicle is going, the more line pressure is needed (to a certain extent) to effect a positive upshift.
There are other factors that affect shift firmness however, as Ford, along with the other automakers, is using a "soft-shift" strategy to accommodate what they feel the female buyer wants, as women are buying more than half of all new vehicles sold. Ford uses a shift delay signal to elongate & soften the upsfhits, and pulling that signal helps to reduce the amount of slippage that occurs during the upshift. There are other factors that affect shift firmness as well, line pressure is just one of them.
I hope this info helps, & good luck with your vehicle.
------------------
Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com
Performance Products F150Online Superchip ordering system: F150Online Superchip Ordering System
First National F-150 Online Rally Event Organizer
