Delay when shifting manually... '95 4L60e
Thread Starter
Pro
Joined: Jun 2001
Posts: 708
Likes: 0
From: Florida
Delay when shifting manually... '95 4L60e
Had the Vette out at the track and it seemed like "forever" when trying to shift from 2nd to 3rd... There's SO many shift tables in TunerCat that I'm not sure which one(s) to play with???
Here's my "Shift Time (sec) Vs. % TPS Vs. Shift Normal Mode, Low Alt." and it looks kinda weird, but maybe not...
Is this the correct table to make changes to if I'm trying to get "instant" shifts when shifting manually at the track (i.e. WOT)???
Other info: '76 Vette w/ '95 LT1/4L60e, minor mods (LT headers, 1.6 RR's, 2.5" exhaust w/ H-pipe, 3.36:1 rear)
... and this is in Florida, so Low Alt!!!
Here's my "Shift Time (sec) Vs. % TPS Vs. Shift Normal Mode, Low Alt." and it looks kinda weird, but maybe not...
Is this the correct table to make changes to if I'm trying to get "instant" shifts when shifting manually at the track (i.e. WOT)???
Other info: '76 Vette w/ '95 LT1/4L60e, minor mods (LT headers, 1.6 RR's, 2.5" exhaust w/ H-pipe, 3.36:1 rear)
... and this is in Florida, so Low Alt!!!
Thread Starter
Pro
Joined: Jun 2001
Posts: 708
Likes: 0
From: Florida
Hmmm... very possible I guess! Now, which "Pressure" table would I look at? Here's a few of the MANY available...
Force Motor Pressure (+ change) What's the difference w/ (-change)...both tables are the same...
Main Line Pressure 0 - 64 MPH
Main Line Pressure 64 - 128 MPH
Line Pressue Offset (Manual mode)
Why so many tables...why, why, why???
Force Motor Pressure (+ change) What's the difference w/ (-change)...both tables are the same...
Main Line Pressure 0 - 64 MPH
Main Line Pressure 64 - 128 MPH
Line Pressue Offset (Manual mode)
Why so many tables...why, why, why???
Last edited by DR76; Jul 20, 2008 at 02:10 PM. Reason: clarification
Burning Brakes
Joined: Nov 2004
Posts: 800
Likes: 3
From: Port Orange FL
I think I can help you but I am a little confused by your question. Are you stating that after it begins to make the upshift it seems to take too long until it actually changes between the gears, or are you stating that there is a delay when you manually push the lever up before it actually begins to make the upshift?
Roy
Roy
Thread Starter
Pro
Joined: Jun 2001
Posts: 708
Likes: 0
From: Florida
When I manually move the lever from 1st to 2nd, the engagement of 2nd gear is almost instantaneous, BUT when moved from 2nd to 3rd (and 3rd to 4th) there is what feels like more than a second before the next gear engages.... (the engine continues reving until the next gear engages)
Yes, that's what I am experiencing ^^^^
Why is there this "delay" in the 2nd to 3rd and 3rd to 4th upshifts, but 1st to 2nd is OK?
Shift Time, Pressure, something else????
Why is there this "delay" in the 2nd to 3rd and 3rd to 4th upshifts, but 1st to 2nd is OK?
Shift Time, Pressure, something else????
Last edited by DR76; Jul 30, 2008 at 10:22 PM. Reason: clarification
Burning Brakes
Joined: Nov 2004
Posts: 800
Likes: 3
From: Port Orange FL
I cant tell you for sure why the delay is there, but I can tell you that mine will do the same thing. I dont believe it has anything to do with any of the tables you have listed, I think you need to get into the valve body to accomplish that.
The first table you initially listed Shift Time (sec) Vs. % TPS Vs. Shift Normal Mode if you set all of the #s to 6.375 it will speed up the shift time a little bit but I dont think it is going to fix your problem. You can also raise the line pressure a little bit in the main line pressure tables which will firm and quicken things up
There is a table in mine called manual mode up/down shift points. I havent messed with that but it is probably where I would start in trying to accomplish what you are.
Why are you wanting to shift it manually at WOT? Why not simply tune it to shift where you want it to when the pedal is to the floor? I dialed mine in so it shifts exactly where I want it to all the time using the normal mode up/down shift point table and the kickdown mode up/down shift points table.
The first table you initially listed Shift Time (sec) Vs. % TPS Vs. Shift Normal Mode if you set all of the #s to 6.375 it will speed up the shift time a little bit but I dont think it is going to fix your problem. You can also raise the line pressure a little bit in the main line pressure tables which will firm and quicken things up
There is a table in mine called manual mode up/down shift points. I havent messed with that but it is probably where I would start in trying to accomplish what you are.
Why are you wanting to shift it manually at WOT? Why not simply tune it to shift where you want it to when the pedal is to the floor? I dialed mine in so it shifts exactly where I want it to all the time using the normal mode up/down shift point table and the kickdown mode up/down shift points table.
Thread Starter
Pro
Joined: Jun 2001
Posts: 708
Likes: 0
From: Florida
Why are you wanting to shift it manually at WOT? Why not simply tune it to shift where you want it to when the pedal is to the floor? I dialed mine in so it shifts exactly where I want it to all the time using the normal mode up/down shift point table and the kickdown mode up/down shift points table.
I'll try to poke around with some of the tables this weekend and will post the results....
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
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
