stallie LOCKUP

[1TUFFUTE]

hey guys, ive done some research but i need someone to tell me how my stallie is working. I have no idea what LOCKUP is or when it is actually working. Lamans terms would be good too or anything u know to enlighten me on my stall convertor. Thanx guys...

[jonbays]

its that feeling you get in fourth on the freeway when you hit a hill and it unlocks and the engine revs up a bit then if the hill is streep it will shift back to third. sort of like a fith gear fourth plus lock up.

[1TUFFUTE]

Originally Posted by jonbays

its that feeling you get in fourth on the freeway when you hit a hill and it unlocks and the engine revs up a bit then if the hill is streep it will shift back to third. sort of like a fith gear fourth plus lock up.

so theres no actual lockup point then. It just drops down a gear if your not over the stall speed if u need more pull,is that right???

[Aaron_EF8]

The convertor has what looks like a small clutch on it, and rather than let the torque convertor slip constantly in low load situations, the clutch engages and creates a direct drive, like a manual. Saves on fuel, lowers cruising RPM and less heat builds up because the convertor isn't doing anything.

You can hear and feel it lock up, it also locks up in 3rd, depending on road speed and throttle position.

[EB Pete]

Originally Posted by Aaron_EF8

The convertor has what looks like a small clutch on it, and rather than let the torque convertor slip constantly in low load situations, the clutch engages and creates a direct drive, like a manual. Saves on fuel, lowers cruising RPM and less heat builds up because the convertor isn't doing anything.

You can hear and feel it lock up, it also locks up in 3rd, depending on road speed and throttle position.

i'm pretty sure it only locks up in 3rd and 4th in the ba later models. i'm not sure about the au but mine for sure does not lockup in 3rd. mine was starting to 'not lock up'. i was told to drive around town (less then 80km/h) in 3rd cause if it is in 4th it will lock up at 60km/h and if you increase throttle position at all it will un lock therefor over time breaking it.

[Aaron_EF8]

Oops, my mistake. I should have added if you manually select 3rd, it will lockup if conditions are right, this I am 500% sure of, it also states it in the BTRE and Ford workshop manuals.

Late ED-onwards will lockup in 3rd gear if left in economy mode in D at light throttle loadings, then partially unlock to shift to 4th before locking up again.

[fairmont1998]

Aaron is correct, if you select 3rd, the convertor will lock up under light load in both I6 and V8.

Late ED onwards I6 will lock up in 3rd and 4th when in drive, V8 will only lock in 4th.

[1TUFFUTE]

thanks for the info guys uve cleared alot up for me already,

So let me get this straight...lockup only occurs in 4th gear(3rd if manualy selected) and only locks up if u are driving with light throttle. I dont understand the use of this fully because under light throttle the revs will be low anyhow, and will be fuel efficient enough allready. :

[EB Pete]

Originally Posted by 1TUFFUTE

thanks for the info guys uve cleared alot up for me already,

So let me get this straight...lockup only occurs in 4th gear(3rd if manualy selected) and only locks up if u are driving with light throttle. I dont understand the use of this fully because under light throttle the revs will be low anyhow, and will be fuel efficient enough allready. :

well it is only really there to stop the convertor from over heating due to it slipping if you are under it's full torque rev piont. and to save fuel.

[1TUFFUTE]

now im really confused : ...so it locks up when ur under heavy throttle to prevent over heating???

[EB Pete]

Originally Posted by 1TUFFUTE

now im really confused : ...so it locks up when ur under heavy throttle to prevent over heating???

i don't really know the ins and outs of them but from what i've worked out they have a certain rev range that they deliver 100% of the torque to the wheels. now if you are under this range the convertor will 'slip' which means it will not deliver all of the torque.

so say you have a 3000grand stall you can put the brakes on (when stopped) and rev it up to around 3000rpm and the convertor will be taking all the power (slipping). then once you let your foot off and accelerate past the 3000 grand mark you will have an awsome launch and the convertor will be giving the wheels all of the torque of the motor.

i think the computer controls lock up in these cars? but it will only lock if you are under the rpm of the convertor on light load and throttle?

and by 'full torque rev limit' which i just made up i mean when the convertor gives the auto 100% of the torque. so say you got a 5100rpm, only at 5100rpm and above the auto will get all the torque.

sorry for it being so confusing.

[1TUFFUTE]

thanks mate..that sounds fair enough :

ill think ill just go play an get some more first hand experience :Up_to_som

[Aaron_EF8]

No it doesn't lockup under power, but this is because the lockup clutch is very small and can't handle any real torque loads, it will just slip. The TCU controls the auto, including lockup.

Torque convertors deliver more than 100% of the engines torque to the wheels (torque miltiplication) , they convert torque (funnily enough) hence the name

Have a look at http://auto.howstuffworks.com/torque-converter.htm if you want to understand what a torque convertor does.