Is this normal???

[BigBobE]

bought surf in august '09, she drives happily (between breakdowns)


when coming onto the motorway she'd kick into overdrive around 53mph


then by mistake i had a vac hose disconnected from boost gauge (after market gauge), drove round about an hour like that when i noticed no turbo.....


now since re-connected truck feels a lot nippier and now Lock up kicks in about 45mph.....


is this good or bad, or do i just flog the beast and buy a newer one????

[Vultch]

the speed mine hits overdrive is approx 55 mph... not sure what you mean by hose of vacuum gauge... where does this hose run to and from where..

[BigBobE]

the speed mine hits overdrive is approx 55 mph... not sure what you mean by hose of vacuum gauge... where does this hose run to and from where..

you have a hose to the boost gauge from engine

[Vultch]

I don't have a boost gauge... 2nd gen 3.0 litre TD, is your an aftermarket gauge

[Scorpion]

Yep, mine kicks in around the 55mph mark.

[Predictable Bob]

Are you sure you're going into overdrive ?

My Surf goes into lockup at 55mph ...

[noobysurfer]

I am confused,What do you mean by kicking in to o/d??Is it not just changing into 4th gear at 55mph and with o/d off it doesnt change up to 4th gear

[BigBobE]

yeah mine used to kick into top gear at 55 now its about 45mph???

[slobodan]

About 55 with standard wheels, will indicate a bit lower on the speedo with bigger tyres.
I thought the lockup was ECU initiated? from the speed sensor.

[dieselboy]

I am confused,What do you mean by kicking in to o/d??Is it not just changing into 4th gear at 55mph and with o/d off it doesnt change up to 4th gear

Lockup is what you feel when you hit about 55mph. The engine and drive become locked together so that there is no lost torque.
You will notice that the engine revs maintain speed changes with the trucks speed even when you are not using any accellerator. You can cruise with less RPM this way, compared to say if you were trying to stay at 45mph where revs will be higher and will drop to almost idle when you remove the accellerator.

It's not exactly the same as when you reach 88mph. Thats a completely different process.

[noobysurfer]

Thanks for clearing that up!:-)

[Predictable Bob]

And for added clarity - driving in lockup is generally far more fuel efficient !