C4 Torque converter lock up
Burning Brakes
Joined: Nov 2015
Posts: 762
Likes: 94
From: Airdrie Alberta
I run a manual lock-up switch on my car. I can lock-up when ever I feel like it. You can get fancy and rig up the converter to unlock when you press on the brake. I usually just use mine on the hiway, as I really don't feel there is enough benefit to lock-up in second unless your foot is on the floor. Third is just a 200-300 rpm drop. I'm still running a stock converter.
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
I run a manual lock-up switch on my car. I can lock-up when ever I feel like it. You can get fancy and rig up the converter to unlock when you press on the brake. I usually just use mine on the hiway, as I really don't feel there is enough benefit to lock-up in second unless your foot is on the floor. Third is just a 200-300 rpm drop. I'm still running a stock converter.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
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
Melting Slicks
Joined: Nov 2013
Posts: 3,451
Likes: 336
From: Greater Cincinnati Area.
Be careful with that if the brake switch isn't involved.
Someone bumps the switch and it can cause undesired operation.
A standard industry test, used to be the "stall test" and it involved engaging the converter on the dyno and literally stalling it out.
It could potentially cause a problem in an enclosed area like a garage if the operator was caught by surprise.
Someone bumps the switch and it can cause undesired operation.
A standard industry test, used to be the "stall test" and it involved engaging the converter on the dyno and literally stalling it out.
It could potentially cause a problem in an enclosed area like a garage if the operator was caught by surprise.
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Aming the wires that the square connector going to the 700r4 are a hot and ground going to the tcc lockup solenoid. The fsm will tell you which one is for the ground. When the ignition is on, the solenoid gets 12 volts. When the ground wire gets grounded, the tcc locks. When my car was in the street, I used the lockup as a 5th gear on the freeway. Make sure the switch is flicked when coming off the freeway. Otherwise the motor chuggs. Now I use it at the strip to lock up the converter after the tranny shifts into 3rd. The car is a tenth to a tenth and a half quicker with the converter locked up.
Last edited by 383vett; Dec 3, 2018 at 04:08 PM.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
A 15 tooth drive gear and an appropriate driven gear(dependent upon tire diameter) and a correct VSS for that tooth count. A mid 40's driven (43 if you had 275/40-17 maybe)
These days with lack of parts an ERA would maybe be a better choice and certainly less aggravating since you don't need to remove C-beam to get at the transmission.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Electronic Ratio Adapter - There's maybe good/better/best -around here Dakota Digital gets mentioned most frequently. I've done a couple Abbott and many, many years ago Specmo offered one. Last time I asked Specmo they said NOT.
ERA might need some consideration since a '93 has ASR and ABS!!!!
Mechanical is maybe a preferred but parts are harder to source. I likely have a 15/43 but a correct VSS for the Corvette extension is I believe very difficult. I mentioned 275/40-17 NOT 18".
Last edited by WVZR-1; Dec 8, 2018 at 08:54 AM.
