Wednesday, December 14, 2005 - 09:10 pm, by: Morgan Cross(Morgan)
Is it true that the 1JZ's turbos are water / oil cooled and because of that there is no point letting the turbos cool down after a hard run?
Since getting my car no matter what, I leave it to warm up for 5 mins at least before I drive and, and probably 3 mins to cool down after every drive, am I wasting my time, or is it actually beneficial to 1JZ turbos?
Cheers.
Edit:I know it's good practise, but I think I remember reading somewhere that unless I've been giving it hell for hours, there is no point for the 1JZ, can't be sure and don't want to risk damaging the turbos.
Wednesday, December 14, 2005 - 09:20 pm, by: Callum Finch(Sigeneat)
My method to madness way of thinking, is that start her up, sit around for 30secs if its the start of the day before driving off. Keep revs below 3,000rpm until the little temp meter gets half way along its bar. Always give 1min to cool down (conservative) and 3mins+ if i have been driving it like stink.
Ultimately, everyone will say that if you dont drive like a loon and just cruise places then no turbo cooldown period is needed since they wont be hot.
I cant comment on whether or not there is liquid cooling to turbos, however certainly you would want to let them spin for a while on idle or near to after a hard run, otherwise the little mud fans will crack and die.
Wednesday, December 14, 2005 - 09:44 pm, by: Aaron Casey(Blownminiturbo)
yeh its better to let cool down slightly, whats a minute here and there to the cost of premature turbo failure!!!! i usually let idle for bout a min first thing in morning then drive slowly till it gets bout 1/3 on temp gauge then its usually alright, cooling down i have 1:30 or 2mins on hot days and bout 3mins after hard driving or highway use. but i have a heaps bigger turbo now so i would rather let cool down properly than warp parts that arent cheap to replace!!!! have you seen a turbo just after hard driving??? have a look at night cause you can see it real good.... nice and red!!!!! so yeh you dont want to turn it off at that heat!!
Wednesday, December 14, 2005 - 10:01 pm, by: Shom Bhattacharjee(Shombre)
Morgan, I go with the 30 second warmup and then baby it rule. Cooldown is easy - about 2-3 min before you get home, just take it *really* easy. My street has a long 40km/h zone, so I tend to use that and cruise at 30-40 in 4th. Bingo, cooldown time. When I'm in and parked, it gets 20 seconds more.
The driver's sunvisor, which has lots of useful information on it from Toyota, recommends a cooldown time of 20sec if you've been driving at 80km/h or less (read : sedately), and 2min if you've been driving at 100km/h or more. So 3 min all the time is probably overkill, but better safe than sorry.
Wednesday, December 14, 2005 - 10:12 pm, by: Graham Dollisson(Alloyvee)
I actually wasn't trying to be funny. The car will warm up faster if you just drive it gently until it hits normal operating temp. Mine will do this in less than 2 mins from my house. Mean while , I am also bring up to temp all the rest of the running gear as well, which is something you will still have to do after your 5 min idling time. I will admit that I don't normally drive the car hard, but if I did, I wouldn't for about 5 mins after driving anyway as I think about turbo's going bang, as well as other driveline bits such as the diff. I hope this clears up what I meant by wasting fuel.
Thursday, December 15, 2005 - 01:22 pm, by: Brian Laws(Asian_warrior01)
the best way to cool down your turbos is to take it easy for a 1kms to 2kms before you get home this way you still have cool air running through the radiator and engine bay unlike when you are stopped
I usually warm up for about 3 minutes (or at least until the temp gauge has reached the first bar) and drive lightly until 5 minutes or so after the temp gauge hits the middle. Warm down is usually a gentle drive for 2 or 3 minutes with a 30 second cool down.
Friday, December 16, 2005 - 12:22 pm, by: David Vaughan(Davidv)
We have had the warmup part of the discussion in a previous thread. Graham and Shom said it again above. Past roughly the time it takes you to settle in and put on your seatbelt and sunnies (take your time), warming up by sitting and idling is a waste of time, petrol and car. With the above, I just make sure the idle has smoothed out.
To add a little clarification, the idling warmup has comparatively little value or effect by itself but it does raise the temperature of engine compared with gearbox and diff (which take longer to warm anyway) making it more likely you will stress the downstream component because the engine is now responding "warmly".
There is a guy over the road who religiously warms his Imprezza for at least three minutes every morning. I look optimistically on this, in that his car is now likely to die sooner so the noise and fuel pollution will soon cease. Not that I have a firm opinion on this one of course
Warm-down is another matter. Simon, Shom and others are dead right.
Don Bagnall Moderator New Zealand 1991 UZZ30 GT4.0 V8
Friday, December 16, 2005 - 05:14 pm, by: Don Bagnall(Baggs)
In all the turbo cars I've had, I've never had, OR needed, a turbo timer fitted: Skyline / Ser.4 RX7 / Nissan Leopard Coupe, and have NEVER EVER had a problem with ANY of them.
I start em up, let em settle, then drive quietly till normal operating temperature is reached, THEN, and ONLY THEN, did I give em hell (If the mood took me).
BUT with normal suburban driving, I never needed to have a "Cool down" period, mainly coz the turbo(s) wern't doing stuff all, idling (Off boost), in essence.
However, if blasting on the open road, and then pausing for a cuppa tea, and a lie down (as ya do), I would let em idle for a minute or so, and as previously stated, I had NO problems at all.
Quite the bees knees in their day, and quite rare in NZ, or any where else for that matter.
Available as Coupe or 4 dr hardtop, with donk sizes ranging from L20E 2ltr.6 cyl. NON turbo, L20E-T 2ltr.6 cyl. Turbo to L28E 2.8ltr.6 cyl.NON turbo (Same donk as the 280z).
Sorta kinda in the luxury coupe bracket, like the Soarer
Saturday, December 17, 2005 - 04:33 pm, by: Kate Green(Mischief)
When we bought our skyline, we asked about getting a turbo timer and the guys said they are a waste of time as long as you let the engine idle for a couple of minutes after a hard slog. I saw this response in an edition of HPI ( actually a '91 soarer TT owner), and I quote:
'I dont't really have anything good to say about turbo timers. All they do in my opinion, is to expose and identify the crucial wires a thief needs to steal your car. They are also illegal, unless fitted with a handbrake switch, as they can keep things like fuel pumps running after a big accident. The whole concept is a waste of tim, with the best prevention against hot engine shutdowns being the nut behind the wheel. Seriously, if drivers don't have the brainpower to drive gently for a couple of minutes before pulling up after a long hard drive, then they don't deserve a turbo car.'
Saturday, December 17, 2005 - 04:43 pm, by: Alan Carter(Alky)
Thanks Don, I must admit at first I had visions of the Leopard tank as used by the Army. I could just see you lining up at the traffic lights on a Saturday night in a tank. In fact, I think they may even have one in the Waiuoru Army museum. Long time since I've been there. Dad's medals & pay book are on display there.
Don Bagnall Moderator New Zealand 1991 UZZ30 GT4.0 V8
Saturday, December 17, 2005 - 04:52 pm, by: Don Bagnall(Baggs)
I sometimes wish I DID have a tank, with some of the irriots on the road. I could cut quite a swath through the rush hour traffic, OR blow them outa the way with the main armament
Kate Green wrote on Saturday, December 17, 2005 - 04:33 pm:
if drivers don't have the brainpower to drive gently for a couple of minutes before pulling up after a long hard drive
Kate, how about if you are running late to some very important meeting or something, which you cannot afford to miss. Obviously you will drive the car hard all the way until you get there. Situations like that, without a turbo timer you'd be trying to balance out what is more important, getting there late and missing the important sale/job/client but having your turbos in top notch condition. Or maybe go hard (within legal speed limits of course, we're talking WOT all the way to the speed limit ) and make it on time, but at the expense of having your turbos cook themselves to death in short time. Obviously you won't be sitting around there waiting for them to cool down since you're already running late...
As you can see, in reality they are very practical units, not everybody is a sunday driver where they can just cruise slowly till they get there. And speaking for myself, I've been in few situations like that and thank god i've got one. Oh, and just so I don't get sarcastic remarks... s.h i.t happens, therefore it is not always possible to run on time, everyone knows that
Previous
In fact, I think they may even have one in the Waiuoru Army museum. Long time since I've been there. Dad's medals & pay book are on display there.
i wish i had a water cooled turbo, now i have to wait over a minute for the thing to cool down! 
