head lift or just need a swirl tank

[Zivic]

Adding the tank isn't a bad thing, but it's not a heat exchanger. You need...more heat exchange. Either via bigger radiator or more airflow.

The NA Z/G cars with 3.5/3.7 engines don't have this problem. They're just hard to bleed.

Unfortunately, your problem is probably too much in the fundamentals of your turbo kit to change. e.g. don't use water cooled turbos. Or perhaps your turbos aren't really in their area of max efficiency (or too much exhaust backpressure). Having them underneath your exhaust manifolds probably isn't helping, either. There are a lot of things that may contributing to your cooling system being a bit overwhelmed- he's just saying that lacking a more efficient system of air removal isn't one of them.

Shit, I just took another look at the pics near the top...one turbo is being fed off the water outlet of the other? I think I would change that first.

edit: I would also feed them with bigger water lines/fittings. Stuff like that banjo bolt I see are probably excellent restrictors, which means the water is probably boiling before it even leaves the first turbo...

I am not sure you background with the cars, but if driven hard enough, the car in N/A form has reported issues... I even put up one guy's post about his.

I don't have extreme high temps. never have. I have an issue of localized hot spots. I have the biggest radiator I could buy at the time. It is about 2x the size of the stock unit. Not even sure if there are larger ones now. I had planned on getting the aftermarket shroud setup, but space constraints would keep me from running it. I have a Strosek front bumper with a much larger grill opening as well.

Extra flow through the turbos is definitely something I would like to do. Running each turbo individually of each other is something I will do if the motor ever comes out. But I am not going to pull the motor for that unless I have no other choice. I have read up on some people's rerouting, but I don't feel confident it would be worth the effort at this point. If this was a more dedicated track car, it might be more critical, but not for a street car.


as far as backpressure goes, my exhaust runs 3.5" dumps off the turbos that drop to 3" and then out a 2.5" true dual exhaust. the exhaust has been reported to test to 14+ psi of boost with zero back pressure... though this is just off the top of my head. I probably could find out exactly. When I did the motor, I was going to jump to dual 3", but that was just too aggressive, too much drone, just flat out too loud. my tuner said my exhaust was more than adequate, and should be fine for another 50-75 hp.


You mention the 370z... they have worse cooling issues than we see with the 350Z. stock form they have all sorts of problems when driven hard. They do respond well to boost, but you need a lot of coolers to keep the heat in check.


I have said it repeatedly in this thread.... the expansion tank is something that I would add regardless of any other things I do to the cooling system. I feel I should install it, and go from there. if my issue is fixed, awesome, if not, I push forward to the next level.