Is this bad for the A4 transmission?
Originally Posted by DeltaT
I asked my friend that works in GM's Powertrain Division on autmatic trannies about not downshifting from OD. He says:
"That is complete and utter bullshit. We test these things in every possible scenario to handle combinations of downshifting, braking, accelerating, all at different tilt angles, line pressures and temperatures. You can stomp on the gas petal in OD and whatever gear it shifts into, based on the programming and sensors, will be able to handle the torque of the stock motor."
He also said "There's people out there that ARE auto tranny specialists and know what they are doing, and there's WAY MORE people out there that work on transmissions that have no idea what they are doing - they are following a recipe without knowing what the changes they are making actually do. Be careful on who you use."
He is working on their next automatic and is a highly regarded mechanical engineer.
Jim
"That is complete and utter bullshit. We test these things in every possible scenario to handle combinations of downshifting, braking, accelerating, all at different tilt angles, line pressures and temperatures. You can stomp on the gas petal in OD and whatever gear it shifts into, based on the programming and sensors, will be able to handle the torque of the stock motor."
He also said "There's people out there that ARE auto tranny specialists and know what they are doing, and there's WAY MORE people out there that work on transmissions that have no idea what they are doing - they are following a recipe without knowing what the changes they are making actually do. Be careful on who you use."
He is working on their next automatic and is a highly regarded mechanical engineer.
Jim
i'm a gm tech and i do transmissions. that is complete bull ****. the trans is designed to downshift.............. od this and double clutch that..........hahaha do what ya want i guess
I think you guys are missing the most important part of that post...
Now how many people in this post have a stock car?
You can stomp on the gas petal in OD and whatever gear it shifts into, based on the programming and sensors, will be able to handle the torque of the stock motor."
Now how many people in this post have a stock car?
He also agreed it could be upgraded but was not comfortable with the reliability of any 4L60E over 520rwtq. He says the 200R4 can be built to 600rwtq, and after that it is built 4L80E or TH400 territory.
Jim
Jim
Why would they put four gears their if they weren't meant to be used?
I've used mine for 40,000 miles and have gotten better times with them then the car would with just D.
I figure if I break the tranny then its just time to upgrade to the TH400.
I've used mine for 40,000 miles and have gotten better times with them then the car would with just D.
I figure if I break the tranny then its just time to upgrade to the TH400.