Originally Posted By: Hokiefyd
Especially for an automatic, I think a redline run is more detrimental to the transmission than the engine. I'm sure the engine could care less (for the most part). It's the transmission that has to handle that WOT/redline upshift. With a 3-pedal car, you can better manage the load on the transmission during an upshift. But most modern vehicles have engine torque management programs that softens engine power during upshifts anyway, to protect the transmission.
Bottom line: wring it out!
agree that the AT takes the hit. in a WOT situation, torque mgt may be disabled for max acceleration, such as a panic maneuver. Even if it's defueled, the AT still has to manage the engine/flywheel/TC inertia during the upshift.
My jeep V6 sounds great WOT, but I don't do it often because 1. it's not necessary, 2. it kills my avg mpg, 3. I plan my merging so that it's not necessary, 4. that 5spd AT is not an inexpensive unit, and under those conditions there's a big surge as it firmly tries to grapple with the spinning engine-- and I can feel the push--- and i know that equates to clutch wear. just doesn't seem worth it.
As to the engine--- there are more forces in play. in automotive use, WOT gets minimal time because you get up to cruise and and then back off. piston/pin acceleration forces are at their highest. weak/tired valve springs could cause a serious problems in they float into a piston. No, I don't see a big problem with it in modern engines, but, well, I've never heard of someone throwing a rod with the cruise set....
M
Especially for an automatic, I think a redline run is more detrimental to the transmission than the engine. I'm sure the engine could care less (for the most part). It's the transmission that has to handle that WOT/redline upshift. With a 3-pedal car, you can better manage the load on the transmission during an upshift. But most modern vehicles have engine torque management programs that softens engine power during upshifts anyway, to protect the transmission.
Bottom line: wring it out!
agree that the AT takes the hit. in a WOT situation, torque mgt may be disabled for max acceleration, such as a panic maneuver. Even if it's defueled, the AT still has to manage the engine/flywheel/TC inertia during the upshift.
My jeep V6 sounds great WOT, but I don't do it often because 1. it's not necessary, 2. it kills my avg mpg, 3. I plan my merging so that it's not necessary, 4. that 5spd AT is not an inexpensive unit, and under those conditions there's a big surge as it firmly tries to grapple with the spinning engine-- and I can feel the push--- and i know that equates to clutch wear. just doesn't seem worth it.
As to the engine--- there are more forces in play. in automotive use, WOT gets minimal time because you get up to cruise and and then back off. piston/pin acceleration forces are at their highest. weak/tired valve springs could cause a serious problems in they float into a piston. No, I don't see a big problem with it in modern engines, but, well, I've never heard of someone throwing a rod with the cruise set....
M