TCC lockup tuning
11-01-2004, 12:53 AM
#1
Supreme Member
Thread Starter
iTrader: (1)
Join Date: Jun 2003
Location: Elgin, IL
Posts: 3,085
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
TCC lockup tuning
Okay, I'm trying to get a little bit better gas mileage out of her while driving 40-55ish MPH (speeds I typically drive at while going to the girlfriend's house).
Car is basically stock at the current point in time. What would be the ideal TCC lockup conditions? I'm looking at this purely from a gas mileage standpoint, performance isn't on my mind now that winter is coming.
Working on setting the highway mode stuff a bit as well. Is it safe to enable the highway spark mode at 1000RPM instead of the stock 1600RPM? At 40MPH, I'm right at 1000RPM (usually driving a little above that though). Should I make highway spark/fuel tables more aggressive as well?
Car is basically stock at the current point in time. What would be the ideal TCC lockup conditions? I'm looking at this purely from a gas mileage standpoint, performance isn't on my mind now that winter is coming.
Working on setting the highway mode stuff a bit as well. Is it safe to enable the highway spark mode at 1000RPM instead of the stock 1600RPM? At 40MPH, I'm right at 1000RPM (usually driving a little above that though). Should I make highway spark/fuel tables more aggressive as well?
Last edited by DuronClocker; 11-01-2004 at 12:57 AM.
11-01-2004, 05:55 PM
#2
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,405
Likes: 0
Received 216 Likes
on
202 Posts
Car: check
Engine: check
Transmission: check
I wouldn't add SA unless it is required for a lean mixture. At that low an RPM (1,000) I don't thnk the engine would like it.
For mileage at 40 MPH, you might be better off in 3rd gear (D) with the TCC locked. The engine should be more efficent at a RPM a little higher then 1,000.
RBob.
For mileage at 40 MPH, you might be better off in 3rd gear (D) with the TCC locked. The engine should be more efficent at a RPM a little higher then 1,000.
RBob.
11-01-2004, 11:46 PM
#3
Supreme Member
Thread Starter
iTrader: (1)
Join Date: Jun 2003
Location: Elgin, IL
Posts: 3,085
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
Hmmm interesting. Thanks I'll look into it. I'll be making the drive again tomorrow so I'll mess with a few things and see how it is driving in 3rd.
11-02-2004, 12:51 AM
#4
Supreme Member
Thread Starter
iTrader: (1)
Join Date: Jun 2003
Location: Elgin, IL
Posts: 3,085
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
I'm a bit confused, it seems as if the lock/unlock tables contradict each other.
Say for example at 36mph...
It locks if TPS is less than 44%.
It unlocks if TPS is more than 20%.
So if I'm cruising at 36mph and step on the gas at 30% throttle, the converter unlocks (being greater than 20% TPS), but immediately its going to want to lock again because it is under 44% throttle. This is looking at it one table at a time as the computer does (when locked, it looks at unlock table, and when unlocked, it looks at lock table). Looks like there are some grey areas like this that will cause it to repeatedly lock/unlock in a loop...
Am I not grasping this concept correctly, or did GM stupidly program these cars? I'm leaning toward the former, but I'd like to know where I'm missing. I don't know what to change to get better mileage if I'm just cruising around nice and easy on the throttle at between 35-50mph (1250ish to 1800ish in 3rd gear)..
Say for example at 36mph...
It locks if TPS is less than 44%.
It unlocks if TPS is more than 20%.
So if I'm cruising at 36mph and step on the gas at 30% throttle, the converter unlocks (being greater than 20% TPS), but immediately its going to want to lock again because it is under 44% throttle. This is looking at it one table at a time as the computer does (when locked, it looks at unlock table, and when unlocked, it looks at lock table). Looks like there are some grey areas like this that will cause it to repeatedly lock/unlock in a loop...
Am I not grasping this concept correctly, or did GM stupidly program these cars? I'm leaning toward the former, but I'd like to know where I'm missing. I don't know what to change to get better mileage if I'm just cruising around nice and easy on the throttle at between 35-50mph (1250ish to 1800ish in 3rd gear)..
Last edited by DuronClocker; 11-02-2004 at 01:10 AM.
11-02-2004, 06:34 AM
#5
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,405
Likes: 0
Received 216 Likes
on
202 Posts
Car: check
Engine: check
Transmission: check
Originally posted by DuronClocker
I'm a bit confused, it seems as if the lock/unlock tables contradict each other.
Say for example at 36mph...
It locks if TPS is less than 44%.
It unlocks if TPS is more than 20%.
I'm a bit confused, it seems as if the lock/unlock tables contradict each other.
Say for example at 36mph...
It locks if TPS is less than 44%.
It unlocks if TPS is more than 20%.
RBob.
11-02-2004, 06:48 AM
#6
11-02-2004, 07:04 AM
#7
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,405
Likes: 0
Received 216 Likes
on
202 Posts
Car: check
Engine: check
Transmission: check
Originally posted by DuronClocker
Wait, switch the values in the tables or just switch the names of the tables?
Wait, switch the values in the tables or just switch the names of the tables?
RBob.
Trending Topics
11-03-2004, 08:27 AM
#9
Junior Member
Join Date: Dec 2001
Location: NC
Posts: 83
Likes: 0
Received 1 Like
on
1 Post
Car: 1989 Trans Am
Engine: 350 TPI
Transmission: 700R-4
i have noticed this with using tunerpro. a 6E ecu has the tables reversed. but using a 32b ecu the numbers and table headings are correct and make sense. so the table numbers are correct but the headings are incorrect? or do you need to reverse the numbers from the 2 tables? can someone please verify which is correct?
11-03-2004, 01:43 PM
#11
Moderator
Join Date: Feb 2000
Location: Schererville , IN
Posts: 7,015
Likes: 0
Received 1 Like
on
1 Post
Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
Transmission: all OD
Axle/Gears: Always the good ones
Early Tunercat $8d's were like that also.(been fixed for well over a yr)
I still have the pretty picture Rbob drew for me on that one! lol Thought I was going nuts!
later
Jeremy
I still have the pretty picture Rbob drew for me on that one! lol Thought I was going nuts!
later
Jeremy
