It could be a lot of things.

First. I see nothing about a modified cooling system. Creating that much horsepower subsequently creates a whole lot of heat too, raising both ambient and internal temperatures. If you're romping on it, and you don't have sufficient cooling you're most definitely going to run hot or even overheat.

The first thing you do when you build a turbo setup correctly is cooling of the three most important aspects to turbocharging.

Intake air temperatures, Oil temperature, and of course coolant temperature.

Also do you have a wideband? what tuning software are you using?

I would like to know your afrs as well, because that also can attribute to related problems.

EDIT: also what is your timing? I'm sure its aggressive as hell too, you could always retard timing a bit to see if that effects anything.

This post was edited by OldAndyAndTheSea on Feb 9 2013 09:37pm

Okay, and yeah, wrapping the manifold would do nothing but good for underhood temps. Or getting it ceramic coated is even better.

What is the distance between the intercooler and the radiator? They should essentially be touching, with little to no voids between them.

I edited my last post to ask about timing. What is your timing advance?

And if your afrs are 14.5 (at an idle Im assuming) how much does it lean out at wide open throttle?

And you are certain you are not losing coolant anywhere? What about the simple stuff?

Like no brainer questions like, maybe a bad water pump? maybe a bad thermostat?

Like I said, lots of variables...haha


EDIT: also you said fans "Blowing"

Are the fans mounted on the back side of the radiator, or the front?

Or one on each?

because if you have a "BLOWER" fan you must also use a puller fan mounted on the back to effectively cool the system.

May have been a typo, but that could be BIG

This post was edited by OldAndyAndTheSea on Feb 9 2013 09:47pm

Another interesting thought.

How long have you been boosting the motor? There is a slight possibility that when under boost your head studs may be stretching and your head may "lift" causing air in the cooling system forcing your thermostat to close, which could be the source of ALL of your problems.

Try this- Turn your heater on full hot and boost the car up til you see the temps rise. Is the hot air coming out of the heater still hot when the temps are rising like that while you are under boost? If the air is cold, then you know coolant has stopped circulating and then you need to replace the head bolts with ARP fasteners and replace the head gasket. Have the head checked for warpage as well.

Please do, you've now got me curious as to the origin of the problem.

Are you located on long island area ? We would be more then glad to check it out for you.

lol i wonder who this is.