My Reroute drawing
 

Please critique. I have most of this done already with the exception of having the heater core plumbed.
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All good to me, but where's the turbo'd coolant going too? Should be going back to the rad ideally. Mine works similar, but heater core goes back in the engine because I need it way up north in ATL. ;)

Turbo is getting fresh water from the block and the feeding into the mixing manifold the way most do it. It would be nice to send it to the rad though. Im just not sure it would get enough flow like that though. As is the water pump pulls water thru the turbo, dosen't it?
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It appears his turbo pulls coolant from the block in that port that's on the side, and then returns it to the mixing manifold/inlet of the water pump.

Overall reroute looks ok to me. I'm assuming you pull hot water to feed the heater before the thermostat, and return after the thermostat.

Correct on both.
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You have a high side and a low side on the cooling system. That is, there are two pressures. The high side is anywhere after the pump and before the thermostat. The low side is anywhere after the thermostat and before the pump, ignoring insignificant losses do to fluid flow. Odds are there is slightly more flow returning the turbo water to the inlet of the WP vs. before the radiator, but it's negligible. I would keep it the way you have it though. You don't circulate much water through the turbo anyways, so it's not adding much heat to the coolant pre-water pump. Maybe 5*F or something, but not much.

Calling Hyper, come in Hyper... *static fuzz noise* :giggle: Looks like a deal.

This is a dumb question, pardon me, but why not just come out of the head, into the heater core, and out of the heater core right into the radiator instead of that loop around the T-stat?

I understand you get a little bit of water circulation through the heater core before the T-stat opens in Levnubhins configuration but that can also be achieved with some drilled holes in the t-stat.

Instead of dumping the heater core into the return line post-thermostat, which effectively defeats the purpose of HAVING a thermostat, I would dump it back into the mixing manifold like the factory does it. The car will warm up faster and the heater will work more quickly. Other than that, looks perfect.

Would certainly be cleaner that way.

I think its a good basic reroute. I'd just retain the left side of the heater core returning to the mixing manifold. Treat the heater core like a second smaller radiator (because it is), and run it just like the main radiator. Source from head, return to mixer.

His heater will work much faster in his configuration. Remember if you have it plumbed back into the mixing manifold like i do (begi race reroute) the heater doesn't turn on till the t-stat opens. So i don't get a heater on just about all my short trips around town unless i let the car fully warm up.

Lev, are you going to plumb the feed to the heater pre or post thermostat?

it's pre.

^
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Then plumbing the heater back to the mixing manifold will be just like the stock configuration, which means you get the heater after about 90 seconds of driving.

Nick, if your heater feed is pre-thermostat, and the return is into the mixing manifold, and it doesn't work, you might have a thermostat that's stuck wide open.

I just switched the heater block to the front of the engine and put the thermostat/radiator at the rear. Your design guarantees slightly better flow for the thermostat, but I can't really see a gigantic difference in terms of performance, especially for racing.

FYI, my thermostat has no problems with failing to open (it's not on a stalk after all) and the heater core warms up normally even in subzero temps. There's also a coolant line that feeds the intake manifold from a boss that is right next to the rear thermostat housing, so you get a little flow. It's apparently enough.

Its post, Meaning it doesn't get much flow till the T-stat opens. No heater till 180* temps. I have been considering blocking off where the heater hose mates to the back of the head and putting it like the drawing above (pre t-stat) which would get me a heater much sooner yes?

Is there any downsides to doing such thing?

+1.

I see where you're going with that, taking advantage of the pressure differential across the thermostat to enforce flow through the heater core at all times. As drawn however, this system has the same fundamental flaw as the "cheap" Bell reroute, wherein coolant exiting the heater core goes into the upper radiator hose. Warmup will take forever, the engine will run too cold, rivers of blood, locusts, etc.

Apart from that, looks good.

Dogs and cats living together...mass hysteria!