Just wondering if anyone has had the same problem. After my car shifts into third it will drop from 6400rmp to 5400rpm then pause for a split second and drop again to 4400-4000 rpm. I am running a auto trans from RPM transmissions and have a multi disc vigalante torque converter with a 4400 stall. The car is a 2000 camaro that has been converted from a six speed to an auto. I am also running the tci stand alone trans computer to control the 4l60e trans.

 

Sounds like the TCC is coming on and that is why you see the second drop in the RPM's.

 

Sounds like lockup clutch is coming on to me, You can verify it in the controller tuning but that would be my guess, Its just the converter locking after the 2-3 shift

 

Would there be anyway to get rid of that second drop? I know in the controller you can tell it what mile per hour you want the converter to lock up at. What if I moved that up to a speed the car would never hit.

 

That would effectivly disable lockup an in 4th gear the trans would tend to overheat . Why do you not want it to lockup , Its one of the big advanatages with high stalls when driving around town for effficency . May be you should set it to lockup in 4th gear only as and alternative ?

 

I was justs thinking that with the second rpm drop it is killing my 1/4 mile mph and et.

 

No because you should have the lockup setup to not lock at full throttle. I am not familiar with that controller but Im sure it has settings to determine how much throttle you can have and still lock .

 

Here are the tcc settings min mph for lockup=50, tcc lockup rate=100, converter lockup delay(s)=1, and a check box for lockup at wot which is not checked.

 

Then it should not be locking at WOT and should be no issue for you then , do you feel it lock at WOT

 

Yes I do because the min mph=50 so it wont lock until 50mph is met. I was thinking of bumping that up to 130mph because that is where I should be when I cross the the other end of the track. I was hoping that would eliminate the rpm drop once it shifts into third.

 

check the tps% vs lock up speed. The converter should be set to lock up @ 40 or in some cases 50mph but only under lite throttle, say 25% or less throttle. So check that table.

 

ok I will also have to try to get my hands on the full version of the tci software right now I only have the demo and I have not come across that table. Hopefully it is in the full version.

 

I got the full version of the software and looked through all the tables and there was nothing that let me change the lockup as a percentage of throttle input. Looks like I am stuck with just bumping the mph at which the converter will lock. Right now I have it set to 255mph so anything under that speed it will not lock. I want to drive the car to see how it feels but right now in the northeast it looks like snow tomorrow.

 

i live close to you so yea i know about the snow. im pretty good at tuning the trans but never dealt with a tci controller. Might be able to help you out, im in edison

 

ok that sounds great I just wish there was somewere I could go to test these changes other than waiting for time to hit the track.

 

some good news now with the tcc min mph=255 I was able to log a little bit and no drop in rpms after the shift into third. Now I just have to figure out where it will make sence to have the converter lock at the track. I think for highway cruising I will set it to 60mph and have the converter lockup delay at 3 seconds.

 

thanks to everybody that posted your input was just what I needed to figure my problem out it is nice that this board exists and a great place to share information.