RPM difference with and w/o TC locked?
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Member
Joined: May 2004
Posts: 105
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From: Memphis
Car: '88 GTA
Engine: 5.7L
Transmission: 700R-4
RPM difference with and w/o TC locked?
At highway speeds (65-70), what should my RPM difference be for a locked torque converter and an unlocked torque converter? (stock TC)
When I tap the brake while cruising, the tach needle barely moves. The last time I took the GTA on a road trip, it got about 21 mpg, and the same trip before it got 25 mpg with no changes in tune/mods.
When I tap the brake while cruising, the tach needle barely moves. The last time I took the GTA on a road trip, it got about 21 mpg, and the same trip before it got 25 mpg with no changes in tune/mods.
Thread Starter
Member
Joined: May 2004
Posts: 105
Likes: 0
From: Memphis
Car: '88 GTA
Engine: 5.7L
Transmission: 700R-4
Thanks. I am pretty sure it will lock in city driving. I can lug the motor doing around 40 with the tach at 1,000-1,100. Is it a common problem for a locking converter not to stay locked at higher speeds?
Member
Joined: Jun 2003
Posts: 158
Likes: 0
From: Wa
Car: 89 RS
Engine: 2.8 (the cruiser)
Transmission: 700R4 (TransGo Kit, VetteServo)
Axle/Gears: 3.42
Hm, I'm having the same problem. If I've been driving at 65 for about 15 minutes the TCC unlocks and then tries to lock, and unlock for a few minutes. Then it typically stays unlocked until I'm going up a hill. It's really weird.
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