When checking under body for oil leaks, my mechanic noticed that a certain comapny who some of us love and some hate had bypassed the water lines to the turbos when they had the engine out last year.

 

Any good reason, or just lazyness because they can be a pig to refit?

Nissan didn't put those waterlines there just because it looks nice..

 

with the engine out, it's very easy to reconnect these lines.

 

as you say..forgotten ? lazyness ?

 

 

Or do you have upgraded turbos installed ? since not all turbos are both oil and watercooled.

 

-Eric

why not just say SE lol :p

I think this was discussed elsewhere and it was thought that the water had little cooling effect and just heated the water more for the rest of the engine.

 

There are kits available to do it so there must be a good reason behind it?

aaron did this too,come on aaron Why?;)

Originally posted by ChrisC

I think this was discussed elsewhere and it was thought that the water had little cooling effect and just heated the water more for the rest of the engine.

 

Not being funny, but if it heated the water... then it cooled the turbos. so it was doing it's job.

 

stu

Only reason is laziness. I think Aaron only bypassed the under plenum hoses which supply the throttle body - they get clogged up with shit and its often easier to just bypass them....

 

CheerZ,

 

Andy

I don't post often, but..

 

Personally, I still stand by my view that the turbo's don't need the water cooling to be reliable.

 

I will say that stock turbo's might have a slightly reduced life without water cooling, but I can say that my (stock) tubs ran without water for a good few thousand miles - and they got hammered (ok, only at stock boost, but I did drive them fairly hard, always letting them cool after a run though), and they had zero oil deposits in the outlet and exhaust side..

 

In fact - thinking on it, one had a water feed, and one didn't! And they both looked identical in terms of wear, oil deposits, colouration (which is related to turbine temperature) etc.

 

As Andy says, the main reason I bypassed mine was that a) I had a leak, and b) my throttle body waterways were blocked solid, and c) because I couldn't get my fat arms down to the ruptured pipe (right at the back of the block, passenger side)..

 

Anyway, put simply, it is my firm belief that the water cooling on the turbos was overkill on Nissan's part, as was the water cooling on the upper plenum - however I can see the use of both of those systems in very very cold countries, where the warm water circulating will probably help warm everything up to temperature sooner than the general underbonnet heat would on it's own - plus the quicker you make the tubs warm, the better, as the oil will heat sooner, and result in reduced wear..

 

Anyway - in the UK, I would quite happily run without those water lines, in fact, I was going to do just that when I put the GT25's (roller bearing cartridge, honed housings etc) on. The only reason it'll have water lines is if we a) have time, and b) the perfectionist that Mr Duff is forces me to put them on :)

 

Aaron

 

(BTW, as Eric (Lymon) says, many aftermarket turbo's are oil cooled only. In fact, in my Renault days, it was highly unusual to see an aftermarket turbo with waterways. Personally, I believe that 99.9% of the cooling on any turbo is from the oil, not the water..)

 

Ok, I really am done rambling now :)

Originally posted by powerlord

Not being funny, but if it heated the water... then it cooled the turbos. so it was doing it's job.

 

stu

 

Yeah I was thinking that as I typed it but as I said it was someone else posted about it.

 

What I think they were saying is that for the relatively small difference it would make to the turbo running temp it would make a pretty big difference above the normal engine temp.

If that makes sense....?

I would have thought the water cooling jacket around the core would help isolate the heat of the turbine housing from the compressor housing and therefore lower charge temps, and in turn help prevent detting.

 

They are lazy basts for not connecting it up.

I have to disagree with AZ lol :D

If Nissan spent all that money designing it im pretty sure it is there for a reason, Turbos build up massive heat and i really cant see how it wouldent help. In the posistion they are relative to the block ect they must have done it for a reason, if you look at the many other blowers on cars that are not water cooled, have a look where most of them are situated, ie behiond or next to the engine, with alot of airflow on them.

 

plus turbo design has moved on in 13 years, but that does not mean the 300zx blowers can have there water taken away from them.

 

Seems like a half job to not have them connected, but then thats nothing new with SE lol.

Some modern high performance turbo engines use the water as a means of cooling the turbos after runnning via a run on pump.

 

Beats a turbo timer anyday !

Originally posted by tinkywinky

Some modern high performance turbo engines use the water as a means of cooling the turbos after runnning via a run on pump.

 

Beats a turbo timer anyday !

 

I thought they recirced the oil? having the oil sit on the bearings at high temperature is what causes buildup of coke I believe that why its good to keep it flowing until everything is at a good tempreture?

Originally posted by MikeGroves

I thought they recirced the oil? having the oil sit on the bearings at high temperature is what causes buildup of coke I believe that why its good to keep it flowing until everything is at a good tempreture?

 

yep you can get them for the cossie.

How long are you supposed to leave you TT running after a good hard session???

Originally posted by tinkywinky

Some modern high performance turbo engines use the water as a means of cooling the turbos after runnning via a run on pump.

 

Beats a turbo timer anyday !

My Lotus Carlton used to do this. There was a small electric pump that pumped water through the turbos and (presumably added as an after-thought and a quick fix) around the cylinder head near cylinders 5 and 6 where the heat built up a bit more than was intended! It used to run for about five minutes after turning off the car.

Originally posted by Welsh Beef

How long are you supposed to leave you TT running after a good hard session???

 

 

personally i always leave for 2 minutes if its mean a nice quiet drive (minimum turbo use)

 

If ive driven hard i always slow down 3 miles before home and then leave for 5 minutes to cool

 

if ive driven it hard to my door I have left for 10 minutes,

 

not sure if someone has some actual recommended figure

on my turbo timer (some smart arse one from Japan)

on a run on the motorway say for 100miles it usually cools down for around 3 minutes, if i have been Blown by the twins :D for a while about 5 minutes, never been longer than 5 minutes, wierd thing is when you start up and its cold and you switch of it will sometimes idel down for around 1.30 ect.

 

best bet is to just compleetly come of the boost a few miles from home and just cruise in, that way you have moving air cooling things down.

not in a position to comment as per the relative pros and cons of waterand or oil cooling, as I have an NA.

 

However,and I think this was the original point, they left a connection off your car. Either they did this because in their considered opinion, water heating was over engineering on the part of Nissan, or because they are lazy bastids.

 

Now if someone makes a change to anything ofmine, even with the best of intentions and doesnt tellme, or ask my opinion, I would be annoyed.

 

If some lazy twat, who I have paid good coin to fix my car,, leaves something undone, I would be annoyed.

 

So the answer to your original question is yes, you (and every other right thinking person) should be bloody anoyed and go round and tell the twats. Just my humble opinion.

Well said jock! I hate trusting to garages

Id ask them (whoever did it) why they did it, and why they didnt consult me first, if youre not happy with the explanation you do or dont get, tell them that you want it putting back the way they found it. FOC of course.