Dry Turbo Housing (NT Water Pipe)

[Luke223]

I have a 92 Turbo Laser (6 bolt) and was attempting to install a new turbo with a dry housing. I bought the NT parts (lower thermostat housing and water pipe) to eliminate the coolant lines going to the turbo. But the water pipe I got also eliminates the coolant hose going to the oil filter housing.

The thermostat housing has a spot for a nipple for the hose that goes to the coolant line into the oil filter housing, but it is in the wrong place. It appears that the thermostat housing eliminates the oil filter coolant line then off to the side there is a threaded hole for a fitting that would connect the oil coolant line. I would need a fitting that would thread into that hole with a nipple to attach the hose.

I have read that other have used the NT parts to eliminate the coolant lines going to the turbo, what am I missing?

 

[Kevin Jewer]

If you want to keep the oil cooler, you have to use a 91-94 turbo water pipe. With a dry center this sucks since you have to block or loop the two ports. Many people tap the bung on the front water pipe to 3.8th NPT and insert a NPT plug.

If you are getting rid of the oil cooler but staying water cooled on the turbo, the 90 turbo parts work.

If you get rid of the oil cooler and go with a dry turbo, like I did, the 90-94 NT parts work well.

In your case, I would plug the 91-94 water pipe like you said, and use the 90 turbo water neck/tstat housing, so you have one nipple left for the oil mixer (the one that was intended for the turbo). If I remember the parts correctly, this should work, and leave no extra fittings on the tstat housing/water neck to plug and potentially leak. The cleanest solution by far is the NT parts getting rid of the oil mixer. That thing is pretty worthless anyway, and cost me (and many others) a motor.

 

[Luke223]

95GSXracer;

Thanks for taking the time to reply. I would have got back sooner but I wanted to make sure all the parts worked before replying.

I ended up using the turbo water pipe that was on the car. I got a fully threaded M16x1.50 bolt at the local fastener shop and cut it down to about 5 threads then used Black RTV with a stainless steel washer to block off the coolant line connection.

As you mentioned above, I also ordered a California '90 turbo thermostat housing. The '90 Federal NT one I got before had a threaded port for a sensor that the CA cars don't have. The '90 CA Turbo housing worked perfect using the turbo coolant connection to go to the oil filter housing instead, with no extra connections.

Thanks again,

 

[Kevin Jewer]

No problem, glad you got it sorted out. I didn't know the CA cars had a different housing, I always blocked that port off with a spare sensor. Learn something new everyday