ZR-1 Net Registry Forums - View Single Post - Cooler Thermostats, Thermostat Modifications and Engine RPM

HAWAIIZR-1 · 12-08-2018

Hey Cliff,

No debate here and I pretty much agree with your findings. My car started running in the mid 230s so I tried to clean out the radiator. No debris, but it had a bunch of sand in fins after some banging on it. That did not help so I replaced original radiator 31K miles on a 95 with DeWitts two core (love the fit and ease of installation) AC Delco 180 (did not drill holes) thermostat and Jerry’s silicone hoses/clamps while I was at it. Marc’s chip already installed.

To my surprise, the thermostat that came out from precious owner was a AC Delco 180 with eight 1/8” holes drilled. [emoji33]. I’ll send it to you if you want it....LOL.

In high 60s degree weather a few weeks ago, it ran in high 190s in various traffic conditions and got to 208 highest in stop and go traffic. I am very pleased and comfortable with that. I am mostly curious how it will do in the summer heat next year. You probably remember I consulted with you about this while I was gathering the parts and decided drilling holes was a no go. Thanks!

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12-08-2018	#5
HAWAIIZR-1 Join Date: May 2010 Location: Japan Posts: 3,556	Cooler Thermostats, Thermostat Modifications and Engine RPM Hey Cliff, No debate here and I pretty much agree with your findings. My car started running in the mid 230s so I tried to clean out the radiator. No debris, but it had a bunch of sand in fins after some banging on it. That did not help so I replaced original radiator 31K miles on a 95 with DeWitts two core (love the fit and ease of installation) AC Delco 180 (did not drill holes) thermostat and Jerry’s silicone hoses/clamps while I was at it. Marc’s chip already installed. To my surprise, the thermostat that came out from precious owner was a AC Delco 180 with eight 1/8” holes drilled. [emoji33]. I’ll send it to you if you want it....LOL. In high 60s degree weather a few weeks ago, it ran in high 190s in various traffic conditions and got to 208 highest in stop and go traffic. I am very pleased and comfortable with that. I am mostly curious how it will do in the summer heat next year. You probably remember I consulted with you about this while I was gathering the parts and decided drilling holes was a no go. Thanks! Sent from my iPhone using ZR-1 Net Registry __________________ Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 Last edited by HAWAIIZR-1; 12-09-2018 at 08:18 PM.