YACT: Engine Braking... is it bad for your car?

Originally posted by: Pacfanweb

Originally posted by: sm8000
Good to know. Reminds me of the time some of us tried to jump-start a diesel minibus

Jump starting an automatic? Can't be done, guess you found that out.

What? I've jump started plenty of automatic transmission vehicles. Probably close to 60 or 70 of them. No problem.

As for auto engine braking, I stand corrected. I always used the D1 and D2 for driving in snow, but never thought to use them on a hill (there aren't many hills where I live and brake fade isn't a problem).

 

[homestarmy]

Originally posted by: Kazem
I'd rather replace brake pads than my tranny.

Nice third post, too bad you don't know anything about cars.

There is no extra wear on the tranny, only on the engine because it is revving at a higher rate.

Stupid.

 

[Eli]

Originally posted by: jumpr

Originally posted by: Pacfanweb

Originally posted by: sm8000
Good to know. Reminds me of the time some of us tried to jump-start a diesel minibus

Jump starting an automatic? Can't be done, guess you found that out.

What? I've jump started plenty of automatic transmission vehicles. Probably close to 60 or 70 of them. No problem.

As for auto engine braking, I stand corrected. I always used the D1 and D2 for driving in snow, but never thought to use them on a hill (there aren't many hills where I live and brake fade isn't a problem).

I think by jump-start, they're actually meaning push-start.

You can't get an engine started using that method if it is attached to an automatic transmission.

 

[Pacfanweb]

Originally posted by: jumpr

Originally posted by: Pacfanweb

Originally posted by: sm8000
Good to know. Reminds me of the time some of us tried to jump-start a diesel minibus

Jump starting an automatic? Can't be done, guess you found that out.

What? I've jump started plenty of automatic transmission vehicles. Probably close to 60 or 70 of them. No problem.
.

I assumed he meant starting by pushing the vehicle, which some people also call jump starting. Which cannot be done unless you have a manual tranny.

 

[Pacfanweb]

Originally posted by: homestarmy

Originally posted by: Kazem
I'd rather replace brake pads than my tranny.

Nice third post, too bad you don't know anything about cars.

There is no extra wear on the tranny, only on the engine because it is revving at a higher rate.
Stupid.

Check before you call names....there absolutely IS extra wear on the transmission by downshifting, and by engine braking. It is not significant if you do it properly, but there is most certainly some wear.

 

[OrganizedChaos]

Originally posted by: Eli

Originally posted by: jumpr

Originally posted by: Pacfanweb

Originally posted by: sm8000
Good to know. Reminds me of the time some of us tried to jump-start a diesel minibus

Jump starting an automatic? Can't be done, guess you found that out.

What? I've jump started plenty of automatic transmission vehicles. Probably close to 60 or 70 of them. No problem.

As for auto engine braking, I stand corrected. I always used the D1 and D2 for driving in snow, but never thought to use them on a hill (there aren't many hills where I live and brake fade isn't a problem).

I think by jump-start, they're actually meaning push-start.

You can't get an engine started using that method if it is attached to an automatic transmission.

why not? although with the tranny stuck in 1st it would be a bear, but couldn't they lock up the TCC manually and push start it? or if the couldn't lock up the TCC , couldn't they push it with another vehicle? once they got it above the stall speed to the torque converter wouldn't it start?

 

[Eli]

Originally posted by: OrganizedChaos

Originally posted by: Eli

Originally posted by: jumpr

Originally posted by: Pacfanweb

Originally posted by: sm8000
Good to know. Reminds me of the time some of us tried to jump-start a diesel minibus

Jump starting an automatic? Can't be done, guess you found that out.

What? I've jump started plenty of automatic transmission vehicles. Probably close to 60 or 70 of them. No problem.

As for auto engine braking, I stand corrected. I always used the D1 and D2 for driving in snow, but never thought to use them on a hill (there aren't many hills where I live and brake fade isn't a problem).

I think by jump-start, they're actually meaning push-start.

You can't get an engine started using that method if it is attached to an automatic transmission.

why not? although with the tranny stuck in 1st it would be a bear, but couldn't they lock up the TCC manually and push start it? or if the couldn't lock up the TCC , couldn't they push it with another vehicle? once they got it above the stall speed to the torque converter wouldn't it start?

Good questions really, I am not entirely sure why exactly it doesen't work.

I always just figured that the torque converter doesen't work backwards.

Never heard of a torque converter that you could lock up manually. Is there a button you push or something?

 

[Pacfanweb]

Because the gears aren't engaged unless there's hydraulic pressure to the transmission, which there isn't unless the torque converter is being spun by the engine. So rolling a auto trans downhill with the selector in low or second (that's L2 for you that don't know) is no different than having it in neutral or reverse. You're just spinning the output shaft.

 

[Eli]

Originally posted by: Pacfanweb
Because the gears aren't engaged unless there's hydraulic pressure to the transmission, which there isn't unless the torque converter is being spun by the engine. So rolling a auto trans downhill with the selector in low or second (that's L2 for you that don't know) is no different than having it in neutral or reverse. You're just spinning the output shaft.

Ahh, yeah, makes sense.

 

[Pacfanweb]

There aren't any factory TC's you can lock up manually, to my knowledge, but since lots are locked up by a solenoid that's activated by the PCM, I'm sure you could just wire it to a switch if you wanted to.

I do remember the old GM "Switch Pitch" converters, that you could change the stall speeds on. Early 70's Buicks, IIRC.

 

[clicknext]

Originally posted by: Pacfanweb

Originally posted by: homestarmy

Originally posted by: Kazem
I'd rather replace brake pads than my tranny.

Nice third post, too bad you don't know anything about cars.

There is no extra wear on the tranny, only on the engine because it is revving at a higher rate.
Stupid.

Check before you call names....there absolutely IS extra wear on the transmission by downshifting, and by engine braking. It is not significant if you do it properly, but there is most certainly some wear.

So, what is the proper way to do it?

(on an automatic)

 

[TekViper]

you can manually lock the converter clutch on a lot of obdI gm cars through the obd port, all you need is a paper clip and know which two pins to short.

 

[Pacfanweb]

Originally posted by: clicknext
(on an automatic)

Downshift one gear at a time, just like with a stick, e.g., don't drop into 2nd from 4th or 5th (or whatever your top gear is in your particular automatic) while running 70mph, unless you REALLY need to.

edited:spelling

 

[OrganizedChaos]

Originally posted by: Eli

Originally posted by: Pacfanweb
Because the gears aren't engaged unless there's hydraulic pressure to the transmission, which there isn't unless the torque converter is being spun by the engine. So rolling a auto trans downhill with the selector in low or second (that's L2 for you that don't know) is no different than having it in neutral or reverse. You're just spinning the output shaft.

Ahh, yeah, makes sense.

hes right now that i think about it. with no line pressure the forward clutch pack can't engage. :beer: for being smarter than me

 

[slag]

Originally posted by: OrganizedChaos

Originally posted by: Eli

Originally posted by: Pacfanweb
Because the gears aren't engaged unless there's hydraulic pressure to the transmission, which there isn't unless the torque converter is being spun by the engine. So rolling a auto trans downhill with the selector in low or second (that's L2 for you that don't know) is no different than having it in neutral or reverse. You're just spinning the output shaft.

Ahh, yeah, makes sense.

hes right now that i think about it. with no line pressure the forward clutch pack can't engage. :beer: for being smarter than me

I've helped push start a geo metro automatic and I've seen my neighbor push start his dodge spirit several times and its an automatic.

It can be done.

 

[Steve]

For those wondering, I meant push-start. And my understanding is that it can't be done on diesels? That what we learned the hard way. Also, that it *can* be done, but it's not easy to do.

And last December my frat had a car smashing for charity. The donated car (an automatic, a late 80's Tercel) had to be push-started about a quarter-mile, but they got it going to bring it to campus.

 

[thedarkwolf]

Originally posted by: Eli

Originally posted by: jumpr

Originally posted by: Pacfanweb

Originally posted by: sm8000
Good to know. Reminds me of the time some of us tried to jump-start a diesel minibus

Jump starting an automatic? Can't be done, guess you found that out.

What? I've jump started plenty of automatic transmission vehicles. Probably close to 60 or 70 of them. No problem.

As for auto engine braking, I stand corrected. I always used the D1 and D2 for driving in snow, but never thought to use them on a hill (there aren't many hills where I live and brake fade isn't a problem).

I think by jump-start, they're actually meaning push-start.

You can't get an engine started using that method if it is attached to an automatic transmission.

My old galaxie with a FMX automatic trans could be push started. The pump wasn't driving the sameway as most trannies in it. It went over it in the manual. I never tried it though.

 

[Pacfanweb]

Originally posted by: slag

Originally posted by: OrganizedChaos

Originally posted by: Eli

Originally posted by: Pacfanweb
Because the gears aren't engaged unless there's hydraulic pressure to the transmission, which there isn't unless the torque converter is being spun by the engine. So rolling a auto trans downhill with the selector in low or second (that's L2 for you that don't know) is no different than having it in neutral or reverse. You're just spinning the output shaft.

Ahh, yeah, makes sense.

hes right now that i think about it. with no line pressure the forward clutch pack can't engage. :beer: for being smarter than me

I've helped push start a geo metro automatic and I've seen my neighbor push start his dodge spirit several times and its an automatic.

It can be done.

Bullshlt. Can't be done. The transmission is not engaged unless the engine is running. For proof, take either of those cars and while driving down the road, shut the engine off but leave it in gear.....the tach will go to zero, because the engine is disengaged from the transmission.
Someone fooled you.