For those with the bolt on sp61gt..

[89 Black Beauty]

I'll probably end up talking to Tim@SP but i don't have the time right now to deal with time zones and it's late and i need an answer somewhat soon.

It's probably realy easy but i want to make sure,

The ct-26is oil and water cooled, however the SP turbo is only oil cooled, so what so i do with the factory coolant lines? block them off or create a loop?

Also it's obvious where the turbo bolts onto the engine but from what i think is the oil feed (thin braided line) Where does that get the oil from?

Dumb question but i can't see it right now because the motor is in the shop and i can't see it in the books. Thanks all:icon_bigg

 

[Ckanderson]

block off factory coolent lines....

turbo gets oil from oil feed on the block.. using a SP adaptor kit..

 

[hottscennessey]

DO NOT block the water lines off, you WILL have overheating. The simple answer is to loop them. I had my car running for over a month blocked off and it didnt overheat until i took it onto the highway for about 5 minutes, the temperature gauge moved to the red very quickly, luckily I caught it with no ill effects. If you have any other SPGT questions feel free to post them.

 

[souprat]

if the sp61gt isnt water cooled then does that mean you have to change the oil more often to avoide cokeing? i would think that if you got a sp61gt that you would also have to get a massive oil cooler to keep bearing temps down.

i kinda think its weird that the sp isnt water cooled. i mean, water cooled is better right? lower bearing temps, longer turbo life, longer oil life(fewer oil changes). 5 points to the upgraded ct. but i know that an upgraded ct cant flow as much as the sp and that the shaft isnt as strong.

 

[hottscennessey]

Its unusual for an aftermarket turbo to be water cooled, thats why I was supprised to find that the BOSS turbos were water cooled. If it made that big of a difference I'm sure all aftermarket turbos would be watercooled, one benefit of not having a water cooled turbo is keeping your cooling system temperatures down. As far as a big aftermarket oil cooler, I dont think so, I run dual stock ones, only because i had an extra one, but I wouldnt worry about running a single stock oil cooler. I dont see the benefits of water cooling if you let your car idle for a minute before shutting it off. I run synthetic just to be safe.

 

[87_7MGTE]

the reason they are watercooled is because of stupid people going out on a hard drive, then parking their car and immediately shutting them off. oil cooled is just as effective, but you need to let the car circulate the oil through the turbo after you drive (hence this is why you need a turbo timer).

 

[evil_shenron]

the sp61gt dbb will be water cooled

 

[MKIIINA]

/\ yup it will loop the water lines. its easier and more effective as it doesnt effect flow in the cooling system as blocking off would. oil if fine just make sure you let it idle down some.

 

[89 Black Beauty]

where does the lower portion on the hose go to? just back into the system dosen't it. Obviously the top is the thermostat.

THe hose i put on there was starting to split so i had just enough hose with me to block off both ends. ( i had to drive it home)
SO far no problems with them blocked off, but i could think that the car would run cooler this way, because it's not feeding hot coolant into the lines.

 

[hottscennessey]

just run a hose from the top to the bottom. You'll be fine temporarily blocking them, but when you're on the highway it WILL overheat. By blocking the lines you're blocking a large ammount of flow through the system.

 

[jdub]

I've had mine blocked off using a SP61GT turbo for the last 5000 miles or so...city & highway driving. Done a few hard runs too...temp gauge never goes above the 4 O'clock position...the motor has never over heated, even with it over 100 deg outside.

The turbo coolant lines is a simple loop...the system does not depend on it for anything else. Blocking the water feeds off will have no effect on the car overheating or not. In fact, since the heat from the turbo is no longer dumping heat into the coolant, it takes that load off the coolant system.

 

[hottscennessey]

well there must be some difference.. I used the original banjo bolt and plugged it with RTV sealant, this probably caused a restriction being screwed in further, preventing flow. I could not drive 2 miles on the highway without seeing the needle move. I'm sure it depends on how you do it, but I looped mine and it hasnt given me any problems since, just giving precautions based on personal experience.

 

[jdub]

During the 1st two weeks after installing the new motor, I had a thermostat that was sticking closed that behaved a lot like what you described. The temp gauge would go hot very quickly...it would only happen starting with a dead cold engine, then the needle would drop like a rock when the thermostat finally opened. The thing is, it was a brand new Toyota thermostat...it was driving me nuts!

I figured it out by stopping, taking Mr plastic hammer, and rapping the thermo housing. I could feel the upper radiator pipe get instantly hot when it opened, and like I said, the needle dropped immediately. Replaced the thermostat and alls well since.

 

[CPT Furious]

I, too, have had zero issues with the factory coolant lines blocked off and I am running the SP61GT. Of course, I also use the turbo timer to cool the oil down before shutdown.

 

[89 Black Beauty]

yeah that's basically what i'm thinking, i agree with jdub.
Since the turbo is not heating the coolant up it will run a bit cooler.(in a sense)
Turbo timers are Gods gift to turbo owners.

 

[Nick M]

if the sp61gt isnt water cooled then does that mean you have to change the oil more often to avoide cokeing?

No on the extra oil change. They are not related. Coking is from the heat soak, as already noted.

 

[89 Black Beauty]

wow time to dig up an old thread... for those who wanted to know since i am the original poster i wanted to say to whoever may be researching that blocking off the lines will not overheat your system.
You may have other issues if it is overheating like described in hottscennessey's posts.

 

[jdub]

What I would do (if you block off the turbo coolant lines) is remove the jiggle valve on the thermostat. This will allow a small amount of flow to the rad and prevent any pressure issues that may prevent the thermostat from opening. Actually, I would do this even if the turbo coolant lines are being used.

 

[IwantMKIII]

No on the extra oil change. They are not related. Coking is from the heat soak, as already noted.

not to mention, from what i understand with today's synthetic oils, this is not much of an issue if at all on normal street cars, making a lot of TT's ultimately useless.

feel free to correct me on that jdub

 

[jdub]

A syn oil does greatly reduce the "coking effect" on engine shut down. What does happen though is the excessive heat in the turbo breaks down the additives in the oil...it has a very small effect overall due to the amounts of oil we're talking about here. So, a turbo timer is not completely useless with syn oils, but has less of a benefit compared to using a conventional dino oil.