Hello all! This is my 1st post

I have only recently jumped into the s2k community; most of the previous (and ongoing) projects have been E30 and E36 BMW’s. I have always wanted an S2000 and finally purchased one this year! Though I was intending on buying a stock s2k, I ended up buying a pre-built turbocharged s2000 with an old journal bearing Precision turbo that ended up falling apart, so this time around I am making it right. Because the setup is already there for the turbo this has made it a bit easier for me as this is the first time I have ever dealt with a turbocharged engine.

I've ordered a GT3076R ball bearing turbo to replace the dead Precision; and am piecing together the remaining items. It will basically be a “drop in” operation since everything is already set up. I have everything I need to hook the beast up to the existing oil lines (including an oil restrictor to work with the BB turbo), but I am missing the water lines as the previous build’s turbo did not have water cooling.

After exploring the forums to find the best solution, it seems as if the 2 most common ones are running water lines from the OEM oil cooler or running them from/to the manifold/TB. I am leaning towards the 2nd option as I do not want to relocate the oil filter at this point and do not want to not run the water lines to the turbo instead of the oil cooler. What do you guys think of the latter option?

For the second option; I have compared pictures from member spectacle’s reply in the https://www.s2ki.com/s2000/topic/765...cooling-lines/ thread to my car, and am trying to figure out the exact lines to tap. It seems as if I would be eliminating running the water lines going through the TB altogether with this option. Is this a bad idea? What is the point of this OEM water lines through TB setup anyways? Will post photos soon!

I am excited to getting involved in the s2000 community and appreciate anyone’s help!

 

Welcome! That's a pretty impressive first post. It seems that a lot of folks don't think the oil cooler is really useful, and thus tapping those lines is OK. On the other hand, IIRC bypassing the water going to the TB will keep it cooler and thus make a tiny bit more power.

 

Thanks Torque, I'm definitely diving right in! Can explain what you meant by this quote regarding the TB method?

 

The coolant lines run thru the TB to help during warm-up. But by bypassing the coolant lines to the TB, it will keep that part cooler. I think that's what he was referencing. Good luck on the build.

 

There's a water line going to the tb to prevent the throttle plate from freezing up in cold weather. Unless you live in sub-zero degree area you'll be fine. Most people don't drive thier s2k in the winter anyway.

 

Yep. I live in Atlanta, and the last thing I need is hot coolant running through my TB heating the air that's going into the engine! It's already plenty hot.

 

I've run my setup for over a year now and haven't had a problem. I'd prefer my setup to the oil cooler because IMO the oil cooler needs to be retained on a turbo motor. I actually plan on running an external one when I get around to redoing my setup again. I'm not monitoring my oil temps yet, but I bet they skyrocket with the OEM cooler retained. I bet they're crazy on the setups that bypass them.

 

Thanks for the insight everyone!

I also live in Atlanta right now so the cold temperatures don't worry me too much. I will be going the TB route.

 

Spectacle, your setup is the one that caught my attention in the first place. Thanks for putting up the pics by the way in the other thread. I agree on you on the oil cooler, until I get an external one I will be retaining the OEM version.

Since this is the setup you're running as well, can you verify the lines I am using? I am making the assumption that X is the feed pipe to the TB heater, and Y is the return line. I added the arrows on there to indicate the presumed direction of coolant flow. Don't really want to "test" the flow direction personally.

Thanks again for the advice!

Ready for the new turbo!

Throttle body water line flow?

 

Can anyone verify the return (marked Y) and feed (marked X) water lines to use and the assumed directivity of coolant flow? I will be routing the water lines this weekend if these can be confirmed. Thanks in advance!