Shift Pressures ?
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Shift Pressures ?
Going forward with my tuning learning 
Next point on my agenda is Shift Pressure . How do we do this ? Best Practices / recommendations 
P.S. FWIW I am compiling a how to document for LS1 Edit beginners like me. This and all my previous findings are going into the same. It is shaping up nicely I might add.
Thanks to help from members. AZC5 
is one major contributor till now.
Next point on my agenda is Shift Pressure . How do we do this ? Best Practices / recommendations P.S. FWIW I am compiling a how to document for LS1 Edit beginners like me. This and all my previous findings are going into the same. It is shaping up nicely I might add.
Thanks to help from members. AZC5 is one major contributor till now.
Racer
Joined: Aug 2003
Posts: 290
Likes: 8
From: 60 miles from BGKY
Originally Posted by V8_Club
Going forward with my tuning learning Next point on my agenda is Shift Pressure . How do we do this ? Best Practices / recommendations
P.S. FWIW I am compiling a how to document for LS1 Edit beginners like me. This and all my previous findings are going into the same. It is shaping up nicely I might add. Thanks to help from members. AZC5 is one major contributor till now.
Next point on my agenda is Shift Pressure . How do we do this ? Best Practices / recommendations P.S. FWIW I am compiling a how to document for LS1 Edit beginners like me. This and all my previous findings are going into the same. It is shaping up nicely I might add.
Thanks to help from members. AZC5 is one major contributor till now.
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Originally Posted by WKMCD
I doesn't take much pressure for me to shift. Sometimes shifting into 6th can take a little more..There, hope I've been helpful.
I would like to know what values people are using etc
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Originally Posted by BHP
If you are using LS1Edit there is a table calibration in the manual that increases shift firmness with increased throttle.
Burning Brakes
Joined: Feb 2005
Posts: 1,190
Likes: 0
From: Fayetteville AR
E-mail Mike Mercury, he knows all about the predator and shift points and pressures. Also try looking in the CF for other post that my help you. I have seen some and it seem like they suggested -5 to -7 on times and +5 to +7 on pressures? This it the next on my list of "TO DO's" too.
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Thanks but I'm using LS1 Edit/Hp Tuners so I would like to know how the above translates over there ? Hmmm lets see I read somewhere that the Predator only allows variations within +/- 20% so on the scale on 1-10 that would correspond to an increase of either 10% or 14% ? Am I on the right track ?
Supporting Vendor
Joined: Jun 2004
Posts: 692
Likes: 13
For the street my preference is to have the trans complete the shift in 1/4 second.
Anything more is slip, anything less is bind.
It really is a matter of preference unless you are making a lot of power and burning up clutch packs. At that point you would need a trans with upgraded aftermarket parts anyway.
Ken
Anything more is slip, anything less is bind.
It really is a matter of preference unless you are making a lot of power and burning up clutch packs. At that point you would need a trans with upgraded aftermarket parts anyway.
Ken
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Originally Posted by Ken@HPTuners
For the street my preference is to have the trans complete the shift in 1/4 second.
Anything more is slip, anything less is bind.
It really is a matter of preference unless you are making a lot of power and burning up clutch packs. At that point you would need a trans with upgraded aftermarket parts anyway.
Ken
Anything more is slip, anything less is bind.
It really is a matter of preference unless you are making a lot of power and burning up clutch packs. At that point you would need a trans with upgraded aftermarket parts anyway.
Ken
Also so you set desired shift time @ .250 ? Do you do that for the whole table or do you set it gradually ?
Supporting Vendor
Joined: Jun 2004
Posts: 692
Likes: 13
Originally Posted by V8_Club
Does adjusting shift pressure affect shift time ? Or is your response related to Desired Shift time ?
Also so you set desired shift time @ .250 ? Do you do that for the whole table or do you set it gradually ?
Also so you set desired shift time @ .250 ? Do you do that for the whole table or do you set it gradually ?
Increasing the shift pressures will decrease the shift time. The shift time tables are for "self learning". Some guys drive harder so the VCM will increase the pressure on its own if the shift time falls below those table values.
I set the shift time tables to .250 and adjust the shift pressures for what I want that day. The Wife is not as fond of the firmer shifts
Ken
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Thanks Ken. So how do you go about increasing the pressure ? in 10% increments accross the board until you get the feel ? or do you have an example ? I'm sorry if I'm asking too much but this tuning thing is GREAT
Regards,
Nabil
Pro
Joined: Oct 2003
Posts: 618
Likes: 1
From: Putting a 50¢ sticker of the U.S. Flag on a $50,000 import does not make one a patriot.
Originally Posted by V8_Club
Does adjusting shift pressure affect shift time ?
If shift times are set lower than the tranny can physically shift in(ie. 0.00), the transmission will apply full line pressure to the next shift in an effort to shift in 0.00 seconds. Which is impossible, causing the shift to always be at full line pressure.
I would personally use .163, as that is the lowest "shift time" from the factory. Shift pressure on the other hand is very subjectional. I would start with little increases in your shift pressure, until you find a setting you like.
Good Luck,
AZC5
