pauls

We all know 3rd Gens run too hot on stock 195* t-stadt. In HOT weather, or slow cruising, cooling fans are on constantly. 160 * t-stadt is fine for HOT summer weather, but questionable for cool early spring / late fall days. Temp gague barely moves, and thats not good for internal friction, clean closed loop operation, or good performance. TPIS and others recomend a 170 * t-stadt for best all around compromise / operation. TPIS, and others way overcharge for these. However, if you go to a Chevrolet dealer and ask for part # 10220957, you will get a 170 * t-stadt for a list price of just $6.92. Origional equipment quality at cheapo prices. If you just ask for a 170* thermostadt without part number, they say they do not carry them , but with that part number, guess what, they can get em! If anyone is interrested, check it out. It worked for me!

86TpiTransAm

If you get an adjustable fan switch and a 180* or 160* thermostat you can control your fans better and you can get cooling in the summer and still have heat in the winter. I know, cuz I do it The computer will go into closed loop at as little at 130* as long as the O2 sensor has reached it's proper temperature. As a matter of fact, I believe those that custom program their own chips can get closed loop even quicker than that. So you see, closed loop is not a problem when it comes to t-stat. IMHO, I think the t-stat you use is based on your own opinions and there is no right or wrong. Personally, I feel paying the extra money for the 170* is pointless but if it suites you well then go for it. BTW, TPIS is a joke!

Grim Reaper

I have to agree with 86, if the eprom is properly tuned it really doesn't matter (from a performance persepective) from a 160, 180 or 195 - they will all perform the same.

I personally prefer a 180* over a 160* as I can get more consistent performance with a 180*.