Z31 turbo.

[pancho y onions]

Will i got a 86 z31 turbo from my freaind for free. I wiil be rebuilding it. Just have 1 question. I belive the 86 came water/oiled cooled Just wondering if i can block off the water line and just use oil too cool it. Ya think it would mess up the turbo. Just grabbing some opinons. also would like to know if it would be esaeir to just do water cooled or oil cooled. This is for a sohc.Thanks

[epokh]

I'm pretty sure this has been answered before...but yes, if it's off an '86 it is watercooled, and no, you don't have to use the water cooling as long as you have an adequate oiling setup.

[pancho y onions]

ok well that got my Q answered.Thanks.

[crzycav86]

Yeah you don't want to run oil through the coolant ports. The oil that goes through the turbo through lubrication also cools it.

[hannibal]

The options are oil only or oil and water. You cant just run water lines...

[david200095367]

I say you run both. It is very easy to connect the water supply.

[Titan]

Run both!

I run a Z31 T3 on my SOHC, and I have no idea why anyone would even suggest to cap off the water ports.

They are put there for good reason, USE THEM.

Not only do they keep operating temperatures down, but also reduce oil coking after shutoff.

Don't be lazy, do it properly.

[Edub1]

My thoughts exactely. You have water cooling, you may as well use it. Tap off the coolant lines from the intake manifold. Just make sure to use the return line.

[pancho y onions]

K well you guys conviced me into using Both. I just have Q. Where would i run the lines for the water. I was looking At the the engine today so i may have some thought in running the water lines. Just would like to know what do you guys recommend.Thanks.

[driftMachine]

Run both!

I run a Z31 T3 on my SOHC, and I have no idea why anyone would even suggest to cap off the water ports.

They are put there for good reason, USE THEM.

Not only do they keep operating temperatures down, but also reduce oil coking after shutoff.

Don't be lazy, do it properly.

Titan, do you know what size fittings you used for the water ports? I have a z31 t3 and want to run water but I'm not sure what size and pitch the threads are on that turbo. I did a quick measurement and they appear to be 18mm. Where did you get yours?

[Titan]

Titan, do you know what size fittings you used for the water ports? I have a z31 t3 and want to run water but I'm not sure what size and pitch the threads are on that turbo. I did a quick measurement and they appear to be 18mm. Where did you get yours?

When I rebuilt my Z31 T3, I used a Chrysler T3 center housing. So my water ports are 3/8" NPT if I remember correctly.

What is the inner diameter of the tapped hole? Is it tapered?

[driftMachine]

When I rebuilt my Z31 T3, I used a Chrysler T3 center housing. So my water ports are 3/8" NPT if I remember correctly.

What is the inner diameter of the tapped hole? Is it tapered?

I'm not sure offhand (I'm not at home at the moment). I'll check this weekend. From what I remember it was around 18mm and not tapered.

[pancho y onions]

So where did you guys run the water lines.

[Chezedik]

I have Z31 (that I made T3/T4) and will be running mine into the TB coolant lines and bypassing the TB that way.

[Toshima]

How much did it cost you to make it to a t3/t4 and were did you buy the parts from? Sorry for the thread jack.

[Titan]

So where did you guys run the water lines.

I ran mine in series from the heater core lines. Right before they enter the firewall.

[Edub1]

Tap off the coolant lines from the intake manifold. Just make sure to use the return line.

Feeling like the invisible man over here.

[Edub1]

I have Z31 (that I made T3/T4) and will be running mine into the TB coolant lines and bypassing the TB that way.

Unless you tune for it this might cause you to run lean. The A/f ratios are set at a given coolant temp. Removing the thermostat can cause the same condition.

[Chezedik]

This doesn't change the coolant temp, it just prevents running coolant from running through the throttle body. This would be used to heat the air (similar to a heat riser on an old carb'd car). The only way it will affect the tune is that the air will be slightly more dense. But let us not forget that we will still be pulling underhood air, so there shouldn't be much change in overall density. But good contribution and good looking out. It really is a good point, I just think we are talking in such minutities (is that a word?) that it isn't that important.

[Chezedik]

Toshima, I bought my Z31 from a guy I used to know for 70, then spent 150 on a balanced compressor assembly (end housing, wheel, backing plate) along with all of my rebuild bearings. Did the work myself. Found a guy on ebay, but a lot of guys who deal in Garrett parts will be able to find you any sort of T4 compressor you want, for a fee. Just make sure to match it up in a way that will be feasible. For instance I have the T3 (.63) and T04b Compressor (.60 V-trim, not as good as T04e .50 in respect to surge limit, but still a fairly usable turbo for our motors). As I am sure that Edub knows, I was going to do a rebuild write-up, as I took a ton of pics, and wrote out all of the steps. However, my pics are on my currently disabled laptop, which I am still trying to fix (can you believe that Edub?). I will do it as soon as possible. Also, if you need any Q's A'd then email me.

[Florida240sx]

Just about to make a thread. I have a k27 turbo off a porsche It is oila nd water cooled. Might end up trading it anywayz.But what is the safest way to tap for the coolant lines on a DOHC ka24de ??? I though you could block them off and you'd be fine, but yall are saying to run coolant lines.

[Chezedik]

Yeah, it would be fine, but seriously, if you can go water cooled. What flange is the K27?

[pancho y onions]

MMMM i like so much to learn So im guessing all you would have to do is run the line to the line that would connect to the manifold, Then for the return line connect it to the manifold where the water used to run. But do think it would raise the temp...just checking thanks.

[pancho y onions]

Oh dint worry about it

[Florida240sx]

I beleive it's a t3 flange. I just won a kit off ebay. log style mani, a k26(blown) and a k27 turbo, fmic, wastegate, apexi bov, and ic pipingFor $400