turbos cooling down after a run

[vxer]

Hi Guys,

After driving hard for a while, is it ok to cool down for the last few minutes of the journey, i.e. <3000rpms... Or do you absolutely have to stick to letting the car idle for a couple of minutes when you\'re stationary?

Cheers, Paul.

[dj_dee99]

So long as you\'re staying off boost, then it should have the same effect as leaving it idling.

[vxer]

So long as you\'re staying off boost, then it should have the same effect as leaving it idling.

Next stupid question   What rpm range is off boost for both turbos?

Ta, Paul.

[Frankie]

Boost depends on pedal pressure.  You can drive along at 3000rpm or 4000 rpm and still be off-boost.  If you have a boost gauge you can keep an eye on it.

[vxer]

Boost depends on pedal pressure.  You can drive along at 3000rpm or 4000 rpm and still be off-boost.  If you have a boost gauge you can keep an eye on it.

Duh...Of course it is! Right, now i need to buy a gague!



Ta, Paul.

[Frankie]

Also if you have the normal twin turbo sequential set-up then no real boost is produced up to 2000rpm.

[dandan]

If you have uprated breathing you should also be able to hear the air filters sucking harder when the car starts to boost, it\'s not a bad indicator until you can get a gauge, plus the blow off/dump/recirc valve shouldnt make any noise when you lift off if you havent loaded any boost on. (bit late to do anything about it by then though!)

[vxer]

Also if you have the normal twin turbo sequential set-up then no real boost is produced up to 2000rpm.

Is it only under WOT that boost will come in, or can it come in at part throttle?

Ta, Paul.

[J.j.]

Is it only under WOT that boost will come in, or can it come in at part throttle?

yes  :yes

Get a boost gauge, very useful having one  :Thumbs-up

[vxer]

yes  :yes

Get a boost gauge, very useful having one  :Thumbs-up

Good idea.

Any recommendations for a good, accurate gague that doesn\'t cost the earth?

 

Ta, Paul.

[dj_dee99]

Also, might be worth getting hold of a turbo timer. No need to sit there while the engine is running, then. let the TT do it for you.

[alexb]

I got a Blitz boost gauge from Nemesis, seems nice and accurate

I drive gently for the last few miles rather than idling when parked as I\'ve noticed oil temps rise pretty quickly when stationary esp after a run when everything\'s pretty hot.

Cheers,
Alex

[AshRX]

Good idea.

Any recommendations for a good, accurate gague that doesn\'t cost the earth?

 

Ta, Paul.

I might have a Blitz one for sale in a couple of days as I have bought a new one, ill let you know when i take it off mate

[Martiny]

Just takes it easy for last mile or so. Our cars have water pumped through the Turbos, and when you stop, the water gets heated and then a convection current is created, so, cooler water comes up and the turbos cool down. Without this feature there is more likelyhood of the oil burning inside the turbo, and then the bearings run dry, and damage is caused next time you start up.

I often open the bonnet when I get home.
Someone said this causes more latent heat to build up, which I dont understand - I asked for the theory behind this but I dont think I ever got an answer.

[AshRX]

Or just buy a turbo timer. I let mine countdown from how hard i have been driving, if I have been taking it easy then 30 secs at idle is more than enough. Hard drive I have seem times of 8 minutes or so to let idle