| Re: Trans problems.....signs of a bad torque converter? |
Subject: Re: Trans problems.....signs of a bad torque converter? by dan0617 on 2012/3/10 21:21:55 You have a 2400 stall converter. In the video you said you are in the gas pretty hard, but you never went over 2300 rpms. Being in 3rd gear, depending on your gearing, you would be at like 60 mph at 2400 rpms with no converter stalling. You are seriously into converter stall since you are going into 3rd gear at such a low rpm, and you will not accelerate hardly at all pushing the pedal down some when in 3rd gear at 20 mph, let alone when keeping the pedal the same after the 2-3 shift. When pulling out easy like that, I have to give it more gas after the 2-3 shift to keep accelerating the same as before the shift, and my shift is coming at a much higher mph and rpm than yours. I'm not sure why you feel it is hanging up by not going into 3rd gear until 16 mph. That is where it would have shifted with a stockish 1000 or 1200 stall converter. I went to the TCI constant pressure valvebody so I could set it to hold it's gears longer at part throttle before shifting, so the revs are higher when going into the next gear, which means less converter stalling. I honestly don't think your trans is slipping. Hard to tell without riding in your car but your video looks exactly like my car did with the high stall converter and stock valve body with shift kit. I think you are not liking the higher stall converter. I honestly don't see anything wrong there. I felt the same feeling you have when I went to a 2800 stall from stock. I think that is just the way they are. I have a pretty good feeling you will need to go back to a stockish converter to get the part throttle feeling you are looking for. The constant pressure valvebody will let you change those part throttle rpms but that doesn't change the fact that you will be into serious stall (which feels like slippage) after the 2-3 shift. Get in 3rd gear with the converter locked up, then give it as much gas as you can without it unlocking the converter. Then try it again in 4th gear. You will see for sure if your trans is slipping or not by doing this. I also noticed the shifts on mine were much harder with cold fluid. In the video you didn't warm the car up at all, the fluid was ice cold for sure. Also, depending on the shift kit built into it by the builder, that controls the firmness of the shifts. There may be a way to fix that hard and slightly delayed shift when fluid is cold, but I honestly doubt you have any problem with slippage or weakness after the 2-3 shift. When in 3rd at such a low mph with a high stall, you need to give it alot of gas to "spool up", so to speak, the converter. Give it enough throttle and it will shift back to 2nd and put you back in the seat because the high stall converter keeps your engine in it's powerband instead of at an rpm below the powerband. It is a tradeoff, sacrifice part throttle comfort to pick up wot power to the ground. Do you have any friends with higher stall converters? Take a ride in or drive their car and see how it feels. Might not feel as bad as ours after the 2-3 shift because they likely are at a higher rpm when hitting 3rd (our cars are as low as I've seen with stockish vavlebody) but I'll bet you will have the same feeling that you are having in your car. |
