manual turbo timing

[fiznat]

I am too cheap to buy a real turbo timer at the molment, besides I was thinking of getting one of those car alarms with the turbo timer feature built in... so for now I am doing the manual style of turbo timing, just letting the car run for a bit after I park.

My question for you people who have had turbos for a while is, how long do you let the car idle down for? I understand it should depend on how hard you beat on it, but what is a good average time to let the car idle down for? Do you also let the car idle down even if you werent getting into boost, but just cruising? Anything else I need to know about manual turbo timing?

Thanks guys!

[N.O. Accorderz]

just crusing...my friends usually let it sit for like 1 minute or so...it also depends if they are in a hurry or not

[Craving4Boost]

actually its best to let it cruise at a very low rpm...about 1800rpm

if you just let it idle it actually stops a lot of the oil flow and therefore messes up the whole point

a good couple minutes of low rpm cruising should do fine

[Tictakman]

cant you just let the engine rev to about 2000 rpm's that would do the same thing as crusing slowly. right?

Zak

[Koby]

Interesting subject.

Back in the day you used to need to turbo-time your turbocharged engine because conventional (dino) oil will coke up if it isn't cooled down slowly from high temps.

Well, having oil coke up in your turbo's journal/ball bearing is a bad thing and will kill it in no time at all.

But with the advent of fully synthetic oils that do not coke at all, you really have nothing to worry about. In theory you are completely fine to just shut the engine off even after WOT pulls.

But in reality, it doesn't hurt anything to let your turbo have coolant and oil run through it for 30-60 seconds after being under postive manifold pressure to let things cool down better.

Personally, I run fully synthetic oils, and just stay off the throttle for a minute or two before I reach my destination. This is prevention enough

[fiznat]

True, I have read that about synthetic oils. Still though, I'm not using synthetic yet. Using dyno oil in the new engine for a few miles before I switch over to syn so I am still affected by the old rules lol.

[WDRacing]

If your not flogging the turbo Fiz, you can shut it off without any problems. If your in boost just prior to shut off I always kept my car running for 1.5 minutes. Never had any problems with bearing "coking".

I also have the manual timer...works great and is very dependable..lol.

[foley]

you'd think some starving electrical engineering student around here would come up with some ingenious way of making a standard bosch 30 amp relay stay on or 60 - 90 seconds after it loses it's swiching voltage, ie latching relay. Wire it up so that the key turns on the relay instead of the standard ignition, and then set it up so the relay stays on for 60-90 seconds after the key is switched off... easy turbo timer, take 15 minutes to install, and consist of a $3 relay and whatever parts were needed to make it latch.

[Structure240sx]

i just have mine set on 1 mintue

[sil80drifter]

Most aftermarket alarm/remote starter systems now come with that option too. So you get both an alarm (power locks etc) and timer.

sil80