jsm00z28ss

iTrader: (4)

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.

FLT

iTrader: (1)

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

performabuilt

iTrader: (25)

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

jsm00z28ss

iTrader: (4)

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.

performabuilt

iTrader: (25)

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 ?

jsm00z28ss

iTrader: (4)

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

performabuilt

iTrader: (25)

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 .

jsm00z28ss

iTrader: (4)

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.

performabuilt

iTrader: (25)

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

jsm00z28ss

iTrader: (4)

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.

BubaGumpShrimp

iTrader: (1)

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.

jsm00z28ss

iTrader: (4)

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.

jsm00z28ss

iTrader: (4)

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.

BubaGumpShrimp

iTrader: (1)

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

jsm00z28ss

iTrader: (4)

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.

jsm00z28ss

iTrader: (4)

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.

jsm00z28ss

iTrader: (4)

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.