Just a heads up guys .

I have in the shop at the moment an upgraded tt with the water coolant pipes having been removed from the turbo's !

This is the third car i have seen this last 6 months with this very risky mod carried out.

 

I would recommend Not having this type of water bypass carried out its only going to lead to a shorten the life span of your turbo's.

 

Air cooled Turbo's are built differently in the core to manage heat etc. water cooled units need water.

 

Hope this is good information for you.

 

 

Daz

D2

Always good to see alternative opinions, no doubt for`s and against for the water cooling been left in place.

 

Have not personally seen any evidence to support it been a "risky" mod, in fact the very mod was common place at SE Nissan some 10+ years ago, with many of these zeds still in service and still supporting the same modification without turbo problem seem to suggest its certainly is not a "risky" mod, sure there is far more "risky" things done with our zeds.

 

Jeff TT

Was about to say sounds like an old SE Nissan "special", they pop up now and again.

I cant see any benifit to this MOD ?

The turbo's need cooling why wuold you remove it ?

 

Maybe if any one knows of the benifits they could update.

This car has been done not so long ago it has new turbo's fitted etc.

The water cooling on these were mainly to prevent heat soak after spirited driving, I guess nissan used these types to increase longevity.

 

Most turbo owners know to drive off boost or let the turbo's idle a few minutes before switch off. If good oil is used and change regularly I can't see a problem

 

I guess the benifit is its much easier to bypass them than to replace them.

its a little more than to prevent heat soak on spirited driving. these units need the cooling constantly.

Ask any turbo specialist and they will tell you the same.

its really not a good idea.

its not difficult to replace the hoses or even the pipes if there are issues.

 

all its doing is building in unreliabilty and shorting the life of the units.

I know that when i was selling a lot of turbo kits for Zed some years back, Turbo Dynamics only ever put a note in their packaging that water feeds must be fitted to (from memory) the ball bearing turbo's, which then was the t25/28 hybrids.

So see no reason why it's an issue with all the others, but yes SE Nissan often didn't fit water feeds to their replacement turbo's.

smithy

I'm with you Dazkent, if they came from the factory with water cooling then they should stay water cooled.

When I took my car for some service work to Phil's (Ex. C&S Woods employee.300zx specialist) he spotted that my turbo cooling water had been bypassed. He wasn't impressed by this and corrected it without prompt.

Had a look on garrett website and they say that some turbos come with water cooling to help prevent coking after shutdown, nowhere do they mention it aids cooling during driving.

hi daz, how far in advance would i need to be booking at the moment to get my 300 looked over? ive got a misfire that needs investigating/sorting.

Send me a pm mate and I can get back to you .

He's a regi user, can't pm.

 

Paul

hi daz, how far in advance would i need to be booking at the moment to get my 300 looked over? ive got a misfire that needs investigating/sorting.

hi mate call me on 07870679047 and i will sort out the details you need.

Had a look on garrett website and they say that some turbos come with water cooling to help prevent coking after shutdown, nowhere do they mention it aids cooling during driving.

 

I looked at the website as well.

 

Its clear the water cooling is there for a reason. And removing the water will shorten the life of the turbo which ever way you look at it.

 

There are no gains in doing the removel . only negatives as i see it.

 

Daz

D2

Can we have a show of hands for failed turbos due to water pipe removal.

From Garrett's website here http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech101.html

 

Oil & Water Plumbing

 

The intake and exhaust plumbing often receives the focus leaving the oil and water plumbing neglected.

 

Garrett ball bearing turbochargers require less oil than journal bearing turbos. Therefore an oil inlet restrictor is recommended if you have oil pressure over about 60 psig. The oil outlet should be plumbed to the oil pan above the oil level (for wet sump systems). Since the oil drain is gravity fed, it is important that the oil outlet points downward, and that the drain tube does not become horizontal or go “uphill” at any point.

 

Following a hot shutdown of a turbocharger, heat soak begins. This means that the heat in the head, exhaust manifold, and turbine housing finds it way to the turbo’s center housing, raising its temperature. These extreme temperatures in the center housing can result in oil coking.

 

To minimize the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after engine shut down . The layout of the pipes should minimize peaks and troughs with the (cool) water inlet on the low side. To help this along, it is advantageous to tilt the turbocharger about 25° about the axis of shaft rotation.

Thanks for finding that topless.

 

So the question is .

 

What are the benifits of removing the water pipes etc from the turbo's?

 

I cant see any other than causing future problems.

 

So why remove them ?