Tranny problems due to aftermarket TB?
Registered User
Joined: Dec 1998
Posts: 615
From: Pekin, IL, United States
Originally posted by OneFlyn95z28
LMFAO!
Just so you guys can figure it out some day....THE ONLY engine senser used to control the transmission is the TPS senor.
The TPS and VSS are used for ALL transmission functions..including pressure control. The Program knows at xx% TPS the engine should be making xxxhp and needs 'yy amount of pressure rise to control a shift at 'zz'MPH to obtain a shift in "m" amount of miliseconds.
Do a search this has been beat to death.
Then again what do I know?
Ellis
Lead Trans Tech
Kirkland Transmission
LMFAO!
Just so you guys can figure it out some day....THE ONLY engine senser used to control the transmission is the TPS senor.
The TPS and VSS are used for ALL transmission functions..including pressure control. The Program knows at xx% TPS the engine should be making xxxhp and needs 'yy amount of pressure rise to control a shift at 'zz'MPH to obtain a shift in "m" amount of miliseconds.
Do a search this has been beat to death.
Then again what do I know?
Ellis
Lead Trans Tech
Kirkland Transmission
Registered User
Joined: Mar 2002
Posts: 3,634
From: Newark, Delaware
Originally posted by OneFlyn95z28
LMFAO!
Just so you guys can figure it out some day....THE ONLY engine senser used to control the transmission is the TPS senor.
The TPS and VSS are used for ALL transmission functions..including pressure control. The Program knows at xx% TPS the engine should be making xxxhp and needs 'yy amount of pressure rise to control a shift at 'zz'MPH to obtain a shift in "m" amount of miliseconds.
Do a search this has been beat to death.
Then again what do I know?
Ellis
Lead Trans Tech
Kirkland Transmission
LMFAO!
Just so you guys can figure it out some day....THE ONLY engine senser used to control the transmission is the TPS senor.
The TPS and VSS are used for ALL transmission functions..including pressure control. The Program knows at xx% TPS the engine should be making xxxhp and needs 'yy amount of pressure rise to control a shift at 'zz'MPH to obtain a shift in "m" amount of miliseconds.
Do a search this has been beat to death.
Then again what do I know?
Ellis
Lead Trans Tech
Kirkland Transmission
Frank
Registered User
Joined: Dec 1969
Posts: 1,431
From: Pacific North West
Yes Frank that is EXACTLY what you were saying. But as usual no one wanted to here it 
That is Why I was LMFAO
DOOM...I am VERY familar with those programs(I Wrote the trans. section help file for LT1 edit) and you need to look a little deeper at what is going on. There is very little input from other sensors save the Trans temp sensor...and it is not on the motor it is attatched to the PSM in the trans.
We have found out(thanks to Ed Write) that it does cross the RPM signal to the VSS signal to check and verify VSS operation. This causes the "High stall no shift" issue many have.
For years I was convinced the MAP sensor played a major roll(Due to the way my trans worked when I had the blower on my car) but we have found no connection at all. Turned out to be issue we are talking about here. I was running a stock ported 48mm tb then and had shift problems due to the same thing that happens when you add a bigger tb. The motor makes more HP/TQ at a lower TPS signal then the computer is programed for. This causes early/soft shift patterns. And believe me with 14# of boost they were real early and soft even with a stock TB
As far as getting a good trans built? If you are any where near Frank I would suggest you get him and/or the shop he works at to get your transmission up to speed for you
Ellis
50k miles and more 11 second passes then you can shake a stick at on my FACTORY clutches and band
That is Why I was LMFAODOOM...I am VERY familar with those programs(I Wrote the trans. section help file for LT1 edit) and you need to look a little deeper at what is going on. There is very little input from other sensors save the Trans temp sensor...and it is not on the motor it is attatched to the PSM in the trans.
We have found out(thanks to Ed Write) that it does cross the RPM signal to the VSS signal to check and verify VSS operation. This causes the "High stall no shift" issue many have.
For years I was convinced the MAP sensor played a major roll(Due to the way my trans worked when I had the blower on my car) but we have found no connection at all. Turned out to be issue we are talking about here. I was running a stock ported 48mm tb then and had shift problems due to the same thing that happens when you add a bigger tb. The motor makes more HP/TQ at a lower TPS signal then the computer is programed for. This causes early/soft shift patterns. And believe me with 14# of boost they were real early and soft even with a stock TB
As far as getting a good trans built? If you are any where near Frank I would suggest you get him and/or the shop he works at to get your transmission up to speed for you
Ellis
50k miles and more 11 second passes then you can shake a stick at on my FACTORY clutches and band
Super Moderator
Joined: May 1999
Posts: 4,060
From: Inverness, FL
Originally posted by OneFlyn95z28
Yes Frank that is EXACTLY what you were saying. But as usual no one wanted to here it That is Why I was LMFAO
Yes Frank that is EXACTLY what you were saying. But as usual no one wanted to here it
That is Why I was LMFAO
If it's not adjusted correctly after you put the new throttle body on, you're transmission will get the wrong reading, and YES, it can damage the transmission if your TPS voltage is too low!
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