Notices
GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

TC Lock up in 3rd at WOT

Thread Tools
 
Search this Thread
 
Old 01-25-2007, 09:35 PM
  #1  
TECH Senior Member
Thread Starter
iTrader: (45)
 
dirt track racer 81's Avatar
 
Join Date: Jun 2005
Location: Hennessey, Oklahoma
Posts: 9,439
Likes: 0
Received 11 Likes on 5 Posts
Default TC Lock up in 3rd at WOT

do you guys with a higher stall have your TC locked or unlocked in 3rd gear at WOT? did a search and couldnt find anything
Old 01-25-2007, 09:39 PM
  #2  
TECH Senior Member
iTrader: (7)
 
KySilverado's Avatar
 
Join Date: Jun 2004
Location: Central Kentucky
Posts: 5,446
Likes: 0
Received 7 Likes on 7 Posts
Default

I've tried it both ways. I run about a .1 faster by not locking. Parish once stated he gained a .2 by locking. Guess I don't have the power to pull it.
Old 01-25-2007, 09:41 PM
  #3  
TECH Senior Member
Thread Starter
iTrader: (45)
 
dirt track racer 81's Avatar
 
Join Date: Jun 2005
Location: Hennessey, Oklahoma
Posts: 9,439
Likes: 0
Received 11 Likes on 5 Posts
Default

but it shouldnt hurt anything should it?? ill try both and see how i like it
Old 01-25-2007, 09:47 PM
  #4  
9 Second Club
iTrader: (7)
 
Rhino79's Avatar
 
Join Date: May 2005
Location: Cabot, AR
Posts: 3,127
Likes: 0
Received 1 Like on 1 Post
Default

NA and Nitrous motors will like it unlocked, Locked converters are good for dyno numbers.
Old 01-25-2007, 09:47 PM
  #5  
TECH Senior Member
iTrader: (7)
 
KySilverado's Avatar
 
Join Date: Jun 2004
Location: Central Kentucky
Posts: 5,446
Likes: 0
Received 7 Likes on 7 Posts
Default

Originally Posted by dirt_track_racer_81
but it shouldnt hurt anything should it?? ill try both and see how i like it
Didn't hurt mine but I'm running one of strongest (debatable) verters going. That is a big load to be throwing at the clutch.
Old 01-25-2007, 10:08 PM
  #6  
TECH Addict
iTrader: (25)
 
2004SSS's Avatar
 
Join Date: Dec 2004
Location: southern california
Posts: 2,913
Likes: 0
Received 0 Likes on 0 Posts
Default

ive read that you should do a dyno run with it locked and unlocked. there should be a point where the two differnet graphs cross eachother(locked vs unlocked) and that is the exact spot you should make it lock up in 3rd to gain some time. it sounds like it should work but in the past i have run a couple tenths leaving it unlocked. im trying to get the to the dyno to prove this theory but everytime i try i get somethign keeping me from going .
Old 01-26-2007, 07:50 PM
  #7  
11 Second Truck Club
iTrader: (31)
 
bluecajun5.3's Avatar
 
Join Date: Jan 2005
Location: Breaux Bridge, LA
Posts: 5,861
Likes: 0
Received 0 Likes on 0 Posts
Default

some usually gain the mph by locking the converter. from what i hear anyways and if the converter is built to handle a lockup in 3rd WOT.

on a dyno, your hp and tq will allways cross over at 5280
Old 01-26-2007, 07:54 PM
  #8  
TECH Addict
iTrader: (25)
 
2004SSS's Avatar
 
Join Date: Dec 2004
Location: southern california
Posts: 2,913
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by bluecajun5.3
some usually gain the mph by locking the converter. from what i hear anyways and if the converter is built to handle a lockup in 3rd WOT.

on a dyno, your hp and tq will allways cross over at 5280

that doesent make sense. i dont see how every car/truck would cross over at that rpm , someone enlighten me.
Old 01-26-2007, 08:08 PM
  #9  
Tin Foil Hat Wearin' Fool
iTrader: (36)
 
1slow01Z71's Avatar
 
Join Date: Oct 2004
Location: Austin, TX
Posts: 23,204
Likes: 0
Received 4 Likes on 4 Posts
Default

Originally Posted by 2004SSS
that doesent make sense. i dont see how every car/truck would cross over at that rpm , someone enlighten me.
I dont know why it does but it does on any that I have looked at.

Turbo motors like the converter locked due to it loading the turbo better, just like going to a 3.42 gear over 4.10 will make a turbo car go quicker(to a certain extent of course) due to loading the turbo more.
Old 01-26-2007, 08:42 PM
  #10  
2nd fastest 5.3 ECSB
iTrader: (14)
 
trever1t's Avatar
 
Join Date: Oct 2005
Location: NorCal
Posts: 26,690
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by 2004SSS
that doesent make sense. i dont see how every car/truck would cross over at that rpm , someone enlighten me.
Something about the way horsepower is measured by the amount of torque and the revolutions that make that occur, but it is slightly more than my feeble mind fully grasps.


Quick Reply: TC Lock up in 3rd at WOT



All times are GMT -5. The time now is 01:54 PM.