Do cold tranny temps affect shifting?
Thread Starter
Race Director
Joined: Oct 1999
Posts: 17,708
Likes: 1,218
From: Phila PA, Bonita Springs FL
Do cold tranny temps affect shifting?
I've noticed my car noses over for a split second, right after I launch when its cold, trans temp is say 118-130..
Closer to 140, no issues at all..
Is something holding it back on the 1-2 shift while its cold, like maybe the thicker fluid, or something else?
Never had this problem before, trans is RPM Level V, and other than this blip, works flawlessly..
Closer to 140, no issues at all..
Is something holding it back on the 1-2 shift while its cold, like maybe the thicker fluid, or something else?
Never had this problem before, trans is RPM Level V, and other than this blip, works flawlessly..
Last edited by YO-EL; Oct 18, 2008 at 05:36 PM.
Race Director
Joined: Mar 2007
Posts: 18,308
Likes: 21
From: Marlton. Increasing performance one speeding ticket at a time! NJ
There is some difference with cold fluid. I think with a higher viscosity, it would cause shifts to be slower, primarily due to the torque converter efficiency.
Otherwise, why else would GM put the tranny cooler inside the radiator, it's to warm up the fluid to operating temp.
Otherwise, why else would GM put the tranny cooler inside the radiator, it's to warm up the fluid to operating temp.
Melting Slicks
Joined: Aug 2006
Posts: 2,205
Likes: 2
From: port monmouth nj
my trans seems to do the same thing when cold with 1st to 2nd shift a bit hard even when driving conservative. could the trans go shift kit have anything to do with it? maybe it needs to get warm also? shifting into overdrive also takes longer when on highway with cold fluid.. 140 plus everything fine. rpm iv trans
Thread Starter
Race Director
Joined: Oct 1999
Posts: 17,708
Likes: 1,218
From: Phila PA, Bonita Springs FL
I've emailed RPM on this..
I'm trying to find out if other guys have this issue,,,,
So far, it looks like its just me..
Most guys running upper 10's low 11's, car sitting cold in the lanes yesterday, nothing like that reported.. Just me..
Hopefully RPM can chine in..
I ahev also contacted Julio of Cartek to see about this, maybe something written in the C5 computer re: cool tranny temps..
Its NOT like its hitting the rev limiter, it just noses over, or slugs for a split sec, then picks right back up & goes..
I'm trying to find out if other guys have this issue,,,,
So far, it looks like its just me..
Most guys running upper 10's low 11's, car sitting cold in the lanes yesterday, nothing like that reported.. Just me..
Hopefully RPM can chine in..
I ahev also contacted Julio of Cartek to see about this, maybe something written in the C5 computer re: cool tranny temps..
Its NOT like its hitting the rev limiter, it just noses over, or slugs for a split sec, then picks right back up & goes..
Le Mans Master
Joined: Nov 2002
Posts: 7,179
Likes: 2
From: Charlotte, NC
I've emailed RPM on this..
I'm trying to find out if other guys have this issue,,,,
So far, it looks like its just me..
Most guys running upper 10's low 11's, car sitting cold in the lanes yesterday, nothing like that reported.. Just me..
Hopefully RPM can chine in..
I ahev also contacted Julio of Cartek to see about this, maybe something written in the C5 computer re: cool tranny temps..
Its NOT like its hitting the rev limiter, it just noses over, or slugs for a split sec, then picks right back up & goes..
I'm trying to find out if other guys have this issue,,,,
So far, it looks like its just me..
Most guys running upper 10's low 11's, car sitting cold in the lanes yesterday, nothing like that reported.. Just me..
Hopefully RPM can chine in..
I ahev also contacted Julio of Cartek to see about this, maybe something written in the C5 computer re: cool tranny temps..
Its NOT like its hitting the rev limiter, it just noses over, or slugs for a split sec, then picks right back up & goes..
I don't tune myself but from playing around with some of the tables on my c4.. there are different trans tables based off trans temp. Maybe you need some tuning done to correct this... obviously the actual temp of the fluid can change how things work on it's own. That's why they have made differnet tables.
-=Rick
