Delayed engine shutoff WTF!!!

[vantastic007]

Has anyone else seen those (bizarre) setups on cars that mean that the engine keeps running after the car is locked up and the driver is half way down the street?

Apart from being illegal on a public road, what is the attraction... AND what is the best thing to do if you see one????

I suppose it is a way of drawing attention... but why not do what the bloke I saw at KFC once... drove up to the door in a clk merc, left the door open and the engine running and walked in an waited in the queue for his food.....

Oh well... As for remote controlling something from a car alarm, I have a remote control with an extra button for a boot unlock, but as I building a pickup don't really need it, any thoughts as to what I could activate with it?? Front fogs, like a merc maybe?

Cheers....

[Johnmk]

sure its not a turbo timer your on about?

[Jimbob Gsi 3.0]

Turbos have them called a turbo timer, so you turn the engine off when the turbos cooler.
As soon as you release the handbrake or use any pedal they cut the engine.

[vantastic007]

AHa! On the Celica GT Four I saw probably was one of them then....

But the saxo with one on was probably just a wannabe.... lmao

Cheers!!!

[vxlgsi]

they can be handy, if your blasting main road then need fuel you dont have to wait for it to cool down just leave it running.. proper handy

[wallopsri]

Turbos spin at silly RPM, (20K upto 180K for low inertia types), & simply shutting an engine off as soon as you pull up would cut the oil supply to the turbine way before it had slowed.... A Turbo Timer runs the engine at tickover for a predetermined period to ensure the oil supply is maintained until the turbine has had time to slow right down....

Without a Turbo Timer the turbine would run on without any oil supply, greatly reducing turbo/turbine life....

[vxlgsi]

its nothing to do with turbine speed, the turbine will speed up and slow down in keeping with engine rpm as it can only turn as fast as the exhaust gasses driving it.

its to do with heat.. if the turbo is red hot and the oil supply stops it can burn the oil and create carbon build up in the turbo, allowing it to cool down stops this.

[vantastic007]

My mate had a Renault turbo (well he wasn't a really good friend) and that had an electric pump that came on when he stopped... It all makes sense now....

[vxlgsi]

My mate had a Renault turbo (well he wasn't a really good friend) and that had an electric pump that came on when he stopped... It all makes sense now....

yep i think the zlets and leh's have them

[wallopsri]

its nothing to do with turbine speed, the turbine will speed up and slow down in keeping with engine rpm as it can only turn as fast as the exhaust gasses driving it.

its to do with heat.. if the turbo is red hot and the oil supply stops it can burn the oil and create carbon build up in the turbo, allowing it to cool down stops this.

Yawn.... Why post if your simply going to berate anothers response....

I never stated heat isn't an issue, I never stated the response regarding cooling was incorrect.... I merely expanded on his response to give a better insight into what happens once a turboed engine is shut down.... The turbine runs on without oil, not good for the centre bearing....

As for carbon build up from burnt engine oil within a turbo ??? New one on me !!!

Your point on cooling is valid, the turbo requires oil & coolant, (if fitted),to cool, cut off the supply of these & the centre bearing will overheat, wear & could eventually seize.... The centre bearing overheats due to friction from still spinning with no oil supply to lube & cool....

Unfortunately your assumption its nothing to do with turbine speed at engine shut down is totally incorrect....

[Jack]

Has anyone else seen those (bizarre) setups on cars that mean that the engine keeps running after the car is locked up and the driver is half way down the street?

Yes, it's called a turbo timer.

Apart from being illegal on a public road, what is the attraction... AND what is the best thing to do if you see one????

Any chance of a link to the leglislation stating the legality of these devices? And the best thing to do if you see one is probably the best thing to do when you see anything belonging to someone else: mind your own ****ing business.

[vxlgsi]

Yawn.... Why post if your simply going to berate anothers response....

I never stated heat isn't an issue, I never stated the response regarding cooling was incorrect.... I merely expanded on his response to give a better insight into what happens once a turboed engine is shut down.... The turbine runs on without oil, not good for the centre bearing....

As for carbon build up from burnt engine oil within a turbo ??? New one on me !!!

Your point on cooling is valid, the turbo requires oil & coolant, (if fitted),to cool, cut off the supply of these & the centre bearing will overheat, wear & could eventually seize.... The centre bearing overheats due to friction from still spinning with no oil supply to lube & cool....

Unfortunately your assumption its nothing to do with turbine speed at engine shut down is totally incorrect....

Nope your wrong this is a quote from HKS

The number one cause of turbo failure is oil "coking". Oil "coking" occurs when a turbocharger is not properly cooled down and the oil that normally lubricates the center cartridge heats up and forms solidified oil deposits. A turbo timer allows an engine to idle for a preset time after the ignition key has been turned to the off position and removed. --- By allowing a turbocharged engine to idle, oil continues to pass through the turbo until it has cooled down to the point where oil "coking" will not occur. In 1982 HKS was the first company to offer a commercially available turbo timer, and has since been the leader in turbo timer technology.

now you just look like a wally...

[taylormade]

Yes, it's called a turbo timer.



Any chance of a link to the leglislation stating the legality of these devices? And the best thing to do if you see one is probably the best thing to do when you see anything belonging to someone else: mind your own ****ing business.

i think they are illegal as your car is runnign and your not in the car ( in control of it) i think

[vxlgsi]

i think they are illegal as your car is runnign and your not in the car ( in control of it) i think

yep its illegal is a copper nearly did me for it when i stopped at a cash point once!

[wallopsri]

I love a debate... Will check out HKS to confirm I'm a wally...lolzzzz

[vxlgsi]

I love a debate... Will check out HKS to confirm I'm a wally...lolzzzz

well its people that guess stuff that cause these internet myths... im guessing somone probably told you.. but they were wrong.. its better to know the truth!

[wallopsri]

well its people that guess stuff that cause these internet myths... im guessing somone probably told you.. but they were wrong.. its better to know the truth!

Some interesting reading later I'm still not convinced that this 'coking' is an issue on anything other than highly tuned race/rally cars.... Seems most would agree that temps within a turbo built for road use could reach 500 degrees, modern day oils should be fine with this, whilst temps within a race turbo can top 900 degrees, which is probably pushing it.... HKS quote 1982, I would guess the engine oils of nearly 30yrs later would be far superior and would in effect be less likely to suffer this 'coking' effect.... Like I said previously, I've never come across carbon within a turbos oil lines or bearings....

I still say a turbine winding down with no cooling or lubrication will fail due to friction promoting heat & wear within the bearings....

[vxlgsi]

Some interesting reading later I'm still not convinced that this 'coking' is an issue on anything other than highly tuned race/rally cars.... Seems most would agree that temps within a turbo built for road use could reach 500 degrees, modern day oils should be fine with this, whilst temps within a race turbo can top 900 degrees, which is probably pushing it.... HKS quote 1982, I would guess the engine oils of nearly 30yrs later would be far superior and would in effect be less likely to suffer this 'coking' effect.... Like I said previously, I've never come across carbon within a turbos oil lines or bearings....

I still say a turbine winding down with no cooling or lubrication will fail due to friction promoting heat & wear within the bearings....

I hear what your saying, but regardless of how long you leave the engine at idle the turbo will still be spinning and the oil will stop flowing when you turn it off so leaving it running for 1 minute or 1 day makes no difference.. so if thats the point of it.. its kind of pointless to have one.

The coking problem was why the timer was invented.. if you feel you dont need it due to modern oils dont fit one.. but id doesnt change what it was origonally designed for.

[crazyseanb]

no need to get so nitty gritty about it, its just to let the turbo spool down to idle speed, if you instantly turn your engine off the turbo will spool down with no oil it it, ****ing it over....but if it spools right down, then it wont **** it over..kapeesh?

[wallopsri]

I hear what your saying, but regardless of how long you leave the engine at idle the turbo will still be spinning and the oil will stop flowing when you turn it off so leaving it running for 1 minute or 1 day makes no difference.. so if thats the point of it.. its kind of pointless to have one.

The coking problem was why the timer was invented.. if you feel you dont need it due to modern oils dont fit one.. but id doesnt change what it was origonally designed for.

Try a little experiment;

1, To imitate a car without a 'turbo timer'...
Electric cooling fan on full speed, unplug it and time how long the fan takes to stop spinning..... This is the period a turbo takes to wind down without cooling or lubrication....

2, To imitate a car with 'turbo timer'...
Electric cooling fan on full speed, switch to lowest speed for say 45secs, unplug it and time how long the fan takes to stop spinning..... This is the period a turbo takes to wind down without cooling or lubrication....

In the above scenarios there is also the question of temperature, scenario 1 has a higher temp so wear will in turn be higher, scenario 2 has had a cooling period which in turn will promote less wear during final wind down....

[vxlgsi]

look we'll be here all day before you realise what im saying is right.. so just go on believeing what you want.

[vxlgsi]

no need to get so nitty gritty about it, its just to let the turbo spool down to idle speed, if you instantly turn your engine off the turbo will spool down with no oil it it, ****ing it over....but if it spools right down, then it wont **** it over..kapeesh?

oh no another one lmao

[crazyseanb]

look we'll be here all day before you realise what im saying is right.. so just go on believeing what you want.

aye...coz you know everything...

[wallopsri]

look we'll be here all day before you realise what im saying is right.. so just go on believeing what you want.

Chill out mate.... I'm not simply regurgitating crap read off the net....

[vantastic007]

I am beginning to regret asking the question.....