2007 Kia Carens [ARCHIVE]

[yapoy86]

kia carnival is equipped with a WASTE GATE type Turbo System while the new kia Carens is equipped with Variable Geometry Turbo System...

here is my little knowledge with Turbo systems...

Waste gate turbo has a "waste gate" chamber to control the flow of exhaust gases during HIGH RPM's. the waste gate opens up to redirect the exhaust gases away from the turbine to avoid over spinning of the Turbo during High RPM's.. At low RPM waste gate turbo is inefficient since it has no capability to spin faster unlike VGT Turbo.. This means the waste gate turbo will be effective at around 2000rpm higher (when the turbo spins at its OPTIMAL Range) but at around 4000rpm the waste gate will open to protect the turbo from over spinning.. The waste gate responds on the AIR Intake pressure given by the turbo

while the Variable geometry turbo has the ability to change its geometry (geometry of the blades) when the engine runs at low RPM's the blades are adjusted to multiply its speed even the engine is at low RPM therefore it can give the "KICK IN" even at low RPM's.. but at high RPM's the blades are adjusted to control the turbo and avoid over spinning.. so even at low RPM's VGT turbo has the "KICK IN" since it is able to spin faster even at low RPM.. This means the VGT have a wide "OPTIMAL RANGE" of different engine RPM's...The VGT control depends on the Air Intake pressure given by the turbo..

Technically the TURBO is spinning at all times whether the engine is at idle or revving... You say the "TURBO kicks IN" is when you feel its power (air intake pressure) given to the engine and not when the turbo starts spinning

[yapoy86]

So I don't understand why we need to wait for 1 minute or more.... few seconds is enough. On the heat standpoint, it doesn't lower the temperature either during idling, hot oil is hot as it is as long as the engine is running

After driving hard say at 4000rpm at high speeds and suddenly you need to turn off the engine.... The high speed bearings of the VGT turbo is HOTTER than the ENGINE OIL and when you turn off the engine the oil circulation will be stopped... The oil left in the HOT High speed bearings will burn and get sticky that will cause the early damage of your VGT...

Cooling down is necessary only if you drive it hard at HIGH rpm (3000 rpm higher continuously) A few seconds to a minute will do just to slow down the turbo and replenish the circulating oil in the cooling system.. This will balance the High Speed Bearing Temperature to Engine Oil Temperature..

but during normal driving conditions like inside the village or just going to nearby places or if you are stuck in traffic there is no need to cool down the turbo..

[CRDIvgt]

You are correct Yapoy86. Turbo spins even at idle, it is just not enough to create the pressure boost at intake. The term "kicks in" refers to the increase in intake air pressure boost to create more engine power. So when the engine is idling for several seconds, the turbo spindle rpm will return to its "idling speed" really quick. Otherwise pressure boost is create for free which is not possible to happen

[rst619]

...... So I don't understand why we need to wait for 1 minute or more.... few seconds is enough. On the heat standpoint, it doesn't lower the temperature either during idling, hot oil is hot as it is as long as the engine is running

Bro depende sa situation kasi yan. The turbine blades of the turbochargers are driven by the exhaust gas. Hence, the longer and "harder" you use the turbo, the hotter the components get. The lubricating oil is AFAIK there to lubricate and at the same time draw out heat from the turbo components.

.....few seconds is enough. :
on moderate speeds and daily city driving oo tama ka.

......So I don't understand why we need to wait for 1 minute or more
Imagine either paakyat ka Baguio, hataw ka ( >>90kph ) or my tow kang trailer for long periods of time. This meant that the turbocharger was utilized for long durations and hence temp tends to increase. the temp is kept in check by the continous circulation of oil drawing out heat from the turbocharger. If suddenly, patayin mo makina mo, the excess heat will burn out the oil and leave deposits sa "rifling" or ung passages ng oil thru the turbocharger. If this happens repeatedly, eventually ma block na ung rifling and therefore lalong wala ng oil mag circulate leading to catastrophic turbo failure.

Idling after continuos use of the turbo under the above scenario will let the oil draw out heat as much as possible from the turbo allowing it to cool sufficiently and therefore when u do turn off the engine, the oil will not be burnt.

ps also during cool downs, the temp of the exhaust gases is much lower therefore also aiding in the cooling of the turbo components

HTH

[yapoy86]

the turbo spindle rpm will return to its "idling speed" really quick.

this is true that turbo will quickly return to its idling speed when engine is idle... but we need to consider the bearings where our fast spinning turbos sit-in are very HOT and it needs continuous oil circulation to lower its temp to engine oil temp.. the bearings are so hot due to very fast spinning and can easily get cooked up if the oil will stop circulating immediately...

VGT creates boosts even at low RPM's compared to Waste Gate Turbo that creates boosts only at high RPM's

[C190]

But I like the GT-808 alarm with turbo timer pero 4k ang pricing niya sa akin e. kala ko 3k+lang.

baka po nagtaas na rin ng presyo ang supplier nila

[CRDIvgt]

Imagine either paakyat ka Baguio, hataw ka ( >>90kph ) or my tow kang trailer for long periods of time. This meant that the turbocharger was utilized for long durations and hence temp tends to increase. the temp is kept in check by the continous circulation of oil drawing out heat from the turbocharger. If suddenly, patayin mo makina mo,
HTH

Ewan ko kung may gagawa nito bro As the other people already said in this tread nobody will park their car immediately (as in 2 seconds) after running 160kph or an uphill climb. Even paakyat ka na Baguio after passing marcos hiway mag slow down kana for a while then you have the turbo temp stabilization. The parts are all metal bro and heat conduction/stabilization is very fast since the engine is water cooled. Water is only at 90C while combustion or other parts is maybe 900C at full load, so try to compute the time needed to dissipate the heat(thermomechanics)

Even we run the engine for long period of time, the radiator is there to remove excess heat from the entire engine including the oil, therefore the temperature is kept at bay. Localized heating such as in Turbo or combustion chamber itself is quickly dissipated by metal parts. Now if we have a cooling system problem, or poor lubricity of the oil which can create more heat than what they are designed for, then it is a different story

[CRDIvgt]

CARENS AT OLD PRICE!!!

by the way, my agent told me there are still 3 units available at OLD PRICE Carens CRDI M/T (3 already reserved). So if you are interested just PM me your cell number/name and I'll have the agent call you.... Para lalo dumami na ang Carens owner

[mqavila]

I forgot to post this yesterday.... I clocked in 1,000kms on my Carens yesterday morning (June 18) at around 7:45 a.m. I was driving along C-5 (and SLEX) at the time so I couldn't take a picture. Shell SLT was the next nearest stop, where I parked and took this picture:

[silicon]

I forgot to post this yesterday.... I clocked in 1,000kms on my Carens yesterday morning (June 18) at around 7:45 a.m. I was driving along C-5 (and SLEX) at the time so I couldn't take a picture. Shell SLT was the next nearest stop, where I parked and took this picture:

congratulations sir on your first 1000km.....