Something's up with my water temp since boosting the car. I'm datalogging, and at highway speed it's running at 199* to 207* just cruising at 65mph, and that's on a cool day. Puttering around secondary roads, it's a few degrees higher.

I've bled the system til I'm crosseyed, run with and without a thermostat, and still the car runs hot. I haven't reinstalled the nose air guide or undertray yet. I know that's not helping me, but I don't know to what extent. I borrowed a coolant pressure tester from Advance Auto, and the system holds steady at 20psi. My radiator cap tested bad, so I bought a new one. I tested the thermostat in a pot of water on the stove, and it opens properly.

My setup:
MSPNP / MAF delete / RX7 550's
FM GT2560R kit with FMIC
Koyo 55mm radiator
New radiator cap
Dual Partzfinder 12" fans wired in parallel
New 180* thermostat with 1/8" bleed hole
New WP belt, verified tight
All external hoses replaced with new Mazda parts
80/20 water to coolant

The fans shouldn't even matter at highway speeds, but I have the Megasquirt programmed to turn them on at 190, so they're pretty much always running. Could my water pump be bad? I don't have any indication of a blown head gasket (no milky coolant or white exhaust smoke).

So what am I missing here?

C

 

Put the undertray on, then report back.

 

Cuz ur so damned hot. ASL?

 

Indeed, put your under tray back on. What does your timing and fuel look like at those speeds? I know it's happening at slower speeds as well, but you could be running the engine a little hot with running too much timing and/or lean. If the system wasn't properly bled, your needle would be spiking up and down as air bubbles passed by the sensor, so I wouldn't worry about that. Also, it sounds stupid, but have you verified the fans are blowing in the correct direction?

 

Your running hot because you dont have this [IMG][/IMG]

 

Ok, that'll be my next step. I was afraid someone would say that. Trimming it to clear the intercooler piping looks like a PITA.

Timing isn't tuned yet, and I'm at around 12:1 or 13:1 while cruising. Already checked the fan direction, they're good.

You kid, right?

C

 

better get some of these to go with that monstrosity:

 

my coolant temps hang right around 210 on a hot day, and in boost on a hot day never goes past 215.

Stock rad
80 water/20 antifreeze
happy untill i start tracking.

 

Trim it as little as possible - it's the OEM radiator ducting and it is hugely important. I bet you never see street temps over 200 degrees with it on.

 

Cruising at 12-13 is bad...

 

Alrighty then, I'll keep my fingers crossed that the ducting and undertray solve it. I built this with the intention of doing tracks days, so unless this gets fixed, my SE-R will keep having all the fun.

C

 

Ha ha ya I only run that on the track, but then again I havent driven my car on the street in almost a year now so.. its still on there.

 

same going on here. My temps never go bellow 197 degrees. Usually when i boost temps go as high as 212. I have no undertray or air guide. I am going to figure something out soon tho.