Anybody install a better radiator with a NISMO thermostat or other aftermarket thermostat with a TT or SC. Can you tell a difference in heating of the engine? Also any gain resulting from cooler temps to the engine. Anyone Dyno before and after?

Stock thermostat 170 degrees
NISMO thermostat 154 degrees.

Looking at Koyo

Help. This may be my next big mod this summer.

 

When i had to replace my radiator due to my fence, incident, I put a koyo in, and did the samco hoses and nismo thermostat at the same time. I noticed a decent drop in temps. I have a blitz RVIT readout monitor, and it shows water temp, and it keeps it down considerably.

When I did a fluidyne in my old honda, it used to take forever to warm up, and it wouldn't run exaclty right for the most part, but with this setup on my Z, the car warms up like normal, and just keeps much cooler. It's a very nice setup indeed.

 

be careful with the NISMO T stat in cold weather climates...the car does not like it and throws CEL lights on a regular basis

 

When I put the Nismo Thermostat in my car I did not notice any temperature change. Is that normal for low temp thermostat? I figured it would lower the water temp a little bit.

 

It will keep the temp lower longer, howerver eventually it will go up to normal operating temps usually, that's normal.

and in cold weather, if the temps stay too low, the ecu may not like it, until after the car is really warmed up, but it would take a while to do so since the thermo. due to when the thermo is opened.

 

i have they koyo and nismo thermostat as well. Seems to work fine.

I really think people should look into replacing their radiator if they run their car hard at all - especially during the summer.

I remember back when I was thinking about it and there were threads where people said don't bother replacing it - that it'll just add weight and the stock one is fine - no way is that right. Sport Z magazine recently did a radiator comparison and the stock one is wimpy - really thin, not even as thick as a single row on my Koyo and my Koyo has 2 rows. Sure it might be heavier, but if it keeps the car running cooler, which is worse, the added 10lbs (if that) or overheating your engine?

 

a radiator does not keep the car running cooler. For those with foriced induction or who run hard in very hot climates, it is a worthwhile mod.

 

if a radiator does not keep the car running cool, then why don't we all just take ours out and toss it away - it's just taking up weight then right?

 

if you had sufficient oil supply and air supply then you certainly could

read these two articles -very good site with lots of good info explained in real world terms: http://auto.howstuffworks.com/cooling-system.htm


http://auto.howstuffworks.com/question248.htm

 

The radiator keeps the engine cool; a bigger one won't keep it cooler, it will merely keep the engine cool in more extreme conditions.

 

It looks like I may go with the Koyo and skip the NISMO thermostat.

 

The only way to more fully guarantee a lower than OEM operateng temperature would be to "also" supplement the lower T-stat with a lower cooling Fan-on setpoint. This item is often overlooked. With FI, the attempt is to limit the operateing temperature under all worst case scenarios so that you can tune for more boost and/or timing with safety.

 

that would be the case while idleing or trudging along in traffic, but when you are moving, the fans are off anyways.

 

I had the Nismo thermostat installed last week.. Temps seem like before to me.. almost like it wasn't put in but I know they did it because I watched them and have the old thermostat too.. For New England, it's been fairly warm-ish here lately(40's-50s) but at night below freezing mostly.. no CEL..

had Water Wetter put in too

--mike

 

I;ve got both the nismo t-stat and the koyo radiator and don't notice a difference.

also, don't waste money on a nismo radiator cap unless you want the bling. I got the 90-96TT cap for $10 and its rated at 1.2 psi as opposed to nismos 1.3 and stock .9

 

Generally true ; however, with FI , what happens is that after a few hi temp blasts the FMIC can heat soak. If shortly thereafter you need to sit in traffic (little airflow) , the first time you blast from a stop the heatsoaked FMIC increases intake charge temps with a lowered detonation tolerance. Note the FMIC act as a heat soak and does not instantaneously change temperature. Lower the Fan set point facilitates cooling the heat soak event as rapidly as possible regardless of the stop and go situation.