I topped out the NASIOC GB - have a motor coming back together for my wagon and will grab one for the STi as my 60k is coming up.

Just remember that if you want your coolant temperature to be lower in stop-and-go traffic and/or low speed you need to reprogram the ECU (or add a relay) to turn the fans on at a lower temperature or they will control your coolant to about 190deg. no matter what you do thermostat-wise. This is particularly true here today when it is 100 deg, 20% humidity, and with the low-density air at 5000' or so.

Another effect to consider is that if the thermostat does manage to keep your coolant temps down,t he ECU will never bring the car out of coldstart mode, which means lost power and worse fuel economy, especially in city driving. I'd pass on it for a street car. Heck, I had a Crucial Racing one sitting around when I built the RS, and left it out in favor of a new OEM one, and that car sees a much higher percentage of race use than any car not also a dedicated autocross/track car. The open-fail feature is nice, but probably not worth the tradeoff unless your car spends tons of time at the track where the extra enriching on a boosted engine could be a good thing.

Kevin, cold start mode ends at around 150 degrees so that is not an issue.

Ah, okay. I saw it brought up elsewhere and it made sense- should have checked into exactly what that temp was first.

Haha no big deal! it never hurts to ask and bring it up in a new thread!

Mike

And anyway... this temp. is also programmable in the ECU too.

Nice for you jokers that can tune your ECUs. :p

I should have jumped on this. I suspect my STI thermostate is sticking...

needle stays in the wavy lines most of the day. then out of no where, even under cruise control it goes way up. way above the normal range. if i turn on the heat full blast it stops going up and comes down very slowly, eventually (i suspect) the thermostat opens up and the temps drop very quickly back to normal. usually a few minutes after that the temps go below normal (just a touch) (even climbing spooner+ AC blasting)


day late & a dollar short :P

That's also a symptom of low coolant- did you check?