91GranSport Posted September 11, 2003 Report Share Posted September 11, 2003 I read in a magazine that vehicles equipped with turbos have to sit at idle for several minutes prior to being shut off, just so that the oil is evenly distributed in the turbo. Is this true? It mentioned that if you drive around real quick and then shut your car off then you can starve the turbo of oil, which will lead to turbo failure. I'm not sure how true this is, but I've also heard of Volvo owners idling their vehicles for several minutes as well so that the turbo doesn't fail. Quote Link to comment Share on other sites More sharing options...
john99gtp Posted September 11, 2003 Report Share Posted September 11, 2003 as far as i know this is true. theres a big warning on the door of my supra stating that, and i have seen many other people at the dragway do that. that is also why GReddy has their turbo timer. You set it for a pre-determined amount of time, take the keys out, and the engine will still run until the time has expired. Im still a newb to this turbo stuff, but thats my 2 cents worth. John Quote Link to comment Share on other sites More sharing options...
SleeperRed90TGp Posted September 11, 2003 Report Share Posted September 11, 2003 Letting it idle a while after running it cools the turbo down so you won't burn (cake) the oil which if done enough times will lead to blockage of the oil passages and oil starvation. Not good Jud Quote Link to comment Share on other sites More sharing options...
dkorinko Posted September 11, 2003 Report Share Posted September 11, 2003 On the TGP it says that when you first start the car, you need to let it idle for 30 seconds so that the turbo can get oil running through it, and I know that when you are running around boosting a lot you should not just shut the engine off...Bad Bad Bad! Quote Link to comment Share on other sites More sharing options...
91GranSport Posted September 13, 2003 Author Report Share Posted September 13, 2003 What about superchargers? Do you have to let them idle for a while before taking off, or turning off the engine? I heard from someone that you have to let your supercharger idle for a while prior to taking off, especially during cold starts in the morning, because the supercharger's oil needs time to fully lubricate the gears and shit. Is that true? Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted September 13, 2003 Report Share Posted September 13, 2003 What about superchargers? Do you have to let them idle for a while before taking off, or turning off the engine? I heard from someone that you have to let your supercharger idle for a while prior to taking off, especially during cold starts in the morning, because the supercharger's oil needs time to fully lubricate the gears and shit. Is that true? Being easy on an engine at cold-starts is a general practice all around. Only certain superchargers have an oiling system to less friction / heat rejection. The Eaton M62 [found on L67] is not oiled and it's a contained system. But a Whipple supercharger does have oil and can either be part of the engine or self-contained system. - Erik Quote Link to comment Share on other sites More sharing options...
god910 Posted September 13, 2003 Report Share Posted September 13, 2003 By stating that The Eaton M90 [found on L67] is not oiled and it's a contained system. do you meant not pressure oiled? Because IIRC it most definetly is oiled statically. Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted September 13, 2003 Report Share Posted September 13, 2003 By stating that The Eaton M90 [found on L67] is not oiled and it's a contained system. do you meant not pressure oiled? Because IIRC it most definetly is oiled statically. Yes. - Erik Quote Link to comment Share on other sites More sharing options...
TGPilot Posted September 14, 2003 Report Share Posted September 14, 2003 Letting it idle a while after running it cools the turbo down so you won't burn (cake) the oil which if done enough times will lead to blockage of the oil passages and oil starvation. Not good Jud Not to correct you, but I have always heard of it as "coking" the turbo shaft. It is true that you should give your turbo time to cool..but if you have not boosted to mid-level or full boost for 10 minutes then you can just shut your car off when you stop. The heat generated in a turbo will most definitley coke a non-synthetic oil onto the turbo shaft if you just shut it off after high boost levels. What happens is everytime you stop the motor after boost, the high temps will cook (coke) the oil to the shaft and layers will build up over time. This will inturn allow the coking to work over to the turbo seal and pre-maturely destroy the seal...thus turbo failure. Tests have shown...sorry can't find the link...that 100% synthetic oil (Mobil 1) will not coke to the shaft no matter the temps or cool down period. As far as letting the motor run to coat the turbo internals...if your oil is fresh, the oil pump is strong, and the galleys are not restricted...there will be oil running through the drain passage at the end of three revolutions of most motors at first crank. The nice part about synthetic oil is it will coat the turbo internals even on with a hot shut-down, so cold starting will not be so harsh. Correct me if I am wrong, but this is how Mr Banks explained the perks of Synthetic oils to me in 1990 when they ran the Syclone on the Salt flats. Quote Link to comment Share on other sites More sharing options...
SmokesGTP Posted September 14, 2003 Report Share Posted September 14, 2003 Interesting info I had no idea this was necessary with a turbo. I always wondered what a turbo timer was for. Quote Link to comment Share on other sites More sharing options...
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