Transmission shifting issues, new converter!
Transmission shifting issues, new converter! I recently had my converter sent off to Circle D and had them make some changes to my converter to help out the slow terrible launch and I had it back and fixed in a week! VERY impressed with their service and how the new converter performs, but I am having shifting issues at WOT. I have had my tuner adjusting shift points down with the little bit bigger stall and for some reason none of the changes are helping. Tuner thinks that it could possibly be blowing thru the converter. Car is a ls1/4l80e 78/75 turbonetics with Tu1 turbo cam, 9" rear with 3.25 gear and 26' mickey T's. Car ran a 10.54 at 128 off the 2 step and foot brake and cut a 1.37 60' foot and was hitting limiter on the 1-2 shift and 2-3 shift. Got the 1-2 shift point fixed but cant seem to pin-point the 2-3 shift issues. Looking for any insight or help here!
When just driving normal, the rpm sat at 2000-2500 and couldn't feel a single shift till it got to 50 mph where it commanded torque converter lockup then it dropped to like 1500 where it normally is for that speed.
FormerVendor
Joined: Jan 2014
Posts: 323
Likes: 3
800 rpm drop on the 1-2 would be more like 1000 rpm on the 2-3. I think the converter is holding efficiently. I would keep working on the tune. Everything sounds spot on so far. Good 60' too on the footbrake. Possibly transmission related? How is the fluid level and smell?
-Brian
-Brian
800 rpm drop on the 1-2 would be more like 1000 rpm on the 2-3. I think the converter is holding efficiently. I would keep working on the tune. Everything sounds spot on so far. Good 60' too on the footbrake. Possibly transmission related? How is the fluid level and smell?
-Brian
-Brian
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Some questions that may help others narrow it down for you. At what boost are you launching and what rpm does the conveter flash to? Next how much boost at 2nd gear shift point and at what rpm and mph is the commanded shift? What is the commanded shift rpm and mph 3rd? When it does shift to 3rd what rpm does it drop to, I'm guessing it drops to a little above where it flashes on the line and holds it a little while mph catches up. With the new converter being looser and probably not as efficient at about 6000 rpm where I'm guessing your shift point is by the 6200 rev limiter. This will give a lower mph vs rpm compared to the last tighter converter causing you to hit the limiter while waiting on commanded mph to be bet. With an 800 rpm drop on the on the initial 1-2 shift leads me to think the conveter is coupled up pretty good in first gear and 2nd gear just isnt holding the power.