How Long Do You Run Your Turbo Timer For?

[discopotato03]

Found time .

Cheers A .

[MotoMan]

Just let mine auto select... generally its no more than 10 seconds..

People seem to think a turbo timer lets your thrash your car then just switch off and walk away..

I believe the best term has been used already.. "Mechanical sympathy"

Anyone driving the rings off their car and thinking a turbo timer is going to cool the whole thing down is a knobjockey.. plain and simple

[Busky2k]

That graph is a bit sketchy disco -

a) Thats assuming the turbo is seeing 900C but I doubt its that hot upon light throttle.

b) What temperature is the 'coking' temperature, and for what oil? A cheapy mineral one?

[rb26s13]

The turbo timer is a marketing tool to separate you from your money . The water cooling system is used to prevent the turbos centre section from getting hot enough to be a reliability issue . Manufacturers have to put warranty on their cars so reliability is important .

WINNER!!!!@%@!#%!@#%!@%!@

[mitchy_]

cheers guys...

i thought 30 seconds was adequate, but it seems it doesnt even need that.

[N1GTR]

A full auto one came with my R32, so i just left it there and its worked without issue the whole time ive had the car

To be honest ive never even thought of taking it out, it hardly wants much time (track sessions excluded) and it works with the alarm, so im happy for it to stay

[nfi]

Think about how hard your turbo is spinning, at 2800RPM down the freeway at 100km/h in 5th gear.

When you hit full boost, at around 2800RPM (For me) the wastegate opens, dumping HEAPS of the exhaust AWAY from the turbo. Hence, it's not spinning as quick as it can be.

Now, take the car off boost (Down the freeway) and ALL of the gasses are pumping through the turbo, spinning it so damn fast. Just the spinning there creates heat.

Thats actually incorrect. Just to help you understand- yes the exhaust gases are all going through the turbine when the engine is off boost but no the turbine is not spinning very fast. When puttering around the exhaust gases are a lot cooler and moving much more slowly than when you have your foot nailed and there is more airflow going through the engine, so therefore out the exhaust and also a lot more heat. It is not only the airflow that spins your turbo it is also the heat.

The turbo is spinning its fastest when the wastegate opens. The reason the wastegate opens is because the engine has produced its desired amount of pressure in the inlet tract so it is diverting gasses away from the turbine to prevent the engine making anymore boost. The turbines speed is proportional to the pressure created in the inlet manifold. Also, remember boost is a measure of restriction not power.

Sorry to hi-jack.

[Link]

I dont have a TT and dont want one

I follow what is written in the Nissan Guide - usually i let the car sit for 5-10 seconds after normal driving and switch it off & when ive been giving it some stick ill leave it for 30sec

[The Mafia]

mine has been turned off for about a year now.

I drive steadily just before I pull up, and yeah, by the time it takes me to open the garage, thats heaps (20 secs).

Anyone setting their Turbo Timer for longer than 30 seconds is a fool. Waste of petrol, and pure wank.

I've seen people have theirs set for 3+ mins...

[illusiVe]

i dont have one, but i generally hoon until about 2-3 streets away from home, get home, open the garage, by the time the cars in the garage, i let it idle for about 10-20 seconds (while turning off car pc etc) then turn it off.

if i've been REALLY hooning, ill let it sit there for about the 5 min mark.

i dont have exhaust temp, but oil temp = 110 when reallly pushing it.. normally is around 80-90.

[Kaido_RR]

auto-mode

[ctjet]

joises... how many times is this gonna get debated

[The Mafia]

joises... how many times is this gonna get debated

until someone gets hurt

[Angus Smart]

fast driving my car hits a max of about 80-85 on the oil.

and around about the same on the water side of things... maybe a little bit cooler 70-80's

i dont really use the turbo timer much. as i dont drive like an idiot around my hood! or around anyone i knows hood. i.e. just before i pull up into someones house.

after the motor way i used to let it idle for a bit. but i notice temps rise more so i just drive off boost and normal when i exit the highway/freeway etc..

[PobodY]

To be quite honest, I didn't want a turbo-timer in my car.

I don't drive that hard, neither does my wife - it's not a screaming drift machine.

However, when I got the alarm installed it came with a timer set at 90 seconds - so most of the time the turbo timer runs for 90 seconds... either that or I just turn it off with the remote.

My wife doesn't like to leave it going, so she almost always kills it.

[discopotato03]

Lost another long post to ##&&*%$@#n Wi Fi .

NFI , EGT's at part throttle cruise or idle are not as cool as many like to think . The whole lean excess air factor thing usually means toasty EGT's no doubt to help the cat converter do it job .

The turbine/compressor speed is not really proportional to boost pressure because while the inlet manifold pressure may be constant mass airflow through it rises with engine speed . If you draw a horizontal line across a compressor map representing constant pressure the speed lines fall off to the right hand side of the map . As our engine accelerates its air demands go up and to keep a head of pressure across the inlet manifold the compressors speed must rise otherwise boost pressure drops .

Cheers A .

[GTR-Ben]

Zip Zero Zilch . Effective water cooling is your turbos best friend . The thermal mass of the centre section in most peoples turbos is quite small , provided you can get its water coolant supply to thermosyphon properly when the engine is shut down you should not have oil cooking issues .

Ball bearing centre sections have an easier time because the balls and races are hardened steel and the surface contact area is much less than bush / plate bearing turbos . A properly designed turbo water cooling system does not allow the cartridge to get hot enough to fry the oil in its bearings . I have a diagram on another PC that I'll post up later time permitting .

A while back I put an uncharacteristically long speil on one board about how I rigged up water cooling to a GT28RS on an FJ20 , when I mentioned that you could easily hear water boiling in its jacket (turbo) after shut down people there had hysterics . I could not make them understand that it was set to allow the steam bubbles to travel up the water outlet pipe into the heads highest point , just inside of the thermostat , out the top hose to the radiators top tank and via the rad cap to the overflow tank . It only did this for the 1-2 minutes that was needed for the coolant to drop the turbos cooling jacket (basically bearing housing) temperature below 100 deg C . The turbos water inlet was plumbed into the blocks coolant drain bung hole which is often the lowest part of the engines cooling system . Cooler water is denser and heavier than warmer water so it made sense to get water from this point . It thermosyphoned perfectly and worked automatically .

There are going to be times when an engine has to be shut down pronto to save it from some terminal problem ie major oil / coolant / fuel leak and its instances like these that an effective turbo water cooling system saves its bacon . As Corky Bell said manufacturers fit them because Joe average wood duck refuses to use good oil (and change it often) and demands to be able to exit his mobile kelvinator (which afterall is just another house hold appliance in his eyes) post haste . Waiting around for the pesky hair dryer to compose itself is for squares man .

The turbo timer is a marketing tool to separate you from your money . The water cooling system is used to prevent the turbos centre section from getting hot enough to be a reliability issue . Manufacturers have to put warranty on their cars so reliability is important .

Cheers A .

Bravo.

You try and tell people they don't need a turbo timer, they never understand this however.

How about turbo's where people have no water cooling? must be a good idea then i guess?

[discopotato03]

My last car was engine wise a bog stock 84 DR30 with its FJ20ET and dinosaur T3 non water cooled turbo . It ran std boost and was never pushed and shut down . I don't use $4.50 supermarket oils . I had it from 85K to 105K with no issues at all .

Was it luck or ...

[700HP-GTR33]

Whatever he says ...cause he knows so much about cooling turbos......discopotato can

I list you as a buddy...please....