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Old 12-27-2006, 08:55 PM   #21
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Quote:
Originally Posted by willwren
The 195 was used by GM for emissions purposes.

I saw no negative mileage effects in either car with the 180'*. And I still don't notice any negative effect on the Zilla with a drilled 160 in the summer on the freeway. City mileage is down, but I don't think that'* related to the thermostat. Bear in mind that car has an aftermarket PCM and a 10% underdrive water pump pulley.
Agreed... Pulled 33 in WV in March with cold weather... And the heat the 180 Puts out.... Um yeah I got cooked out of the car on a Cold FL day( yeah we get a few cold days ) because my Air Mix( Temp Control ) died on full hot, left me no choice but to repair it...

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Old 12-27-2006, 09:49 PM   #22
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You guys may want to be careful of which cars you suggest doing this to. All 2000 and newer Bonneville’* will set a trouble code and turn a check engine light on if the temp does not reach 176 F within the first few miles of driving. You’re pushing it pretty close to setting a light with a 180 F stat. Personally, I would not suggest anything other than 195.
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Old 12-27-2006, 10:24 PM   #23
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Quote:
Originally Posted by 2000SilverBullet
I always have to laugh at the fuel mileage comments when you increase power.

Duh....more air = more fuel = more power

more power = more pedal and visa versa
Laugh all you want. I was simply pointing out the facts and results others have experienced.
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Old 12-27-2006, 10:33 PM   #24
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My mileage has improved since I started modding.

I can get 28 mpg with a fully warmed engine driving at 30 mph.
At 50 mph it jumps to 36 mpg.

A more aggressive right foot will drop those numbers in half.
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Old 12-27-2006, 10:44 PM   #25
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bonneville is correct be very carefull changing the t-stat on the newer series 2'*. The motor is designed to run with the 195 and you are best to leave it alone. Putting the lower t-stat in will not prevent UIM failure and will in fact cause you problems.
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Old 12-27-2006, 11:17 PM   #26
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Quote:
You guys may want to be careful of which cars you suggest doing this to. All 2000 and newer Bonneville’* will set a trouble code and turn a check engine light on if the temp does not reach 176 F within the first few miles of driving. You’re pushing it pretty close to setting a light with a 180 F stat. Personally, I would not suggest anything other than 195.
While it is true that the newer models like mine have a trouble code for detecting faulty T-stats. (Engine failed to reach operating temperature). Yes I used to set that code often but only when I had drilled large 1/8" holes in the stat to delay warm up. The normal 180 stat will not set it off.
Then I added an E-stat from ZZP to trick the computer into thinking the engine was warmer than it was. That worked great, so I could run with the drilled 160 F Stat all the time.
Now I have disabled the computer code and set the fans for the 160 stat.
The engine is very happy and nice and cool.
Best mileage I have even gotten with this car.
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Old 12-27-2006, 11:23 PM   #27
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Actually guys.. the 180 has been well proven out by Grand Prix and Bonne owners. Apparently the 180'* do get up the the 176 and keep temps up just enough to do the trick.. Good information to mention though. Always should keep this in mind when ever changing anything stock.. you can cause more problems.
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Old 12-27-2006, 11:29 PM   #28
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I have found that the coolant temp will rise as the transmission heats up due to the oil cooler inside the radiator.
It can rise to 195 even with a 160 stat if the engine load is high and the temp is warm outside.
With the stock 195 it can rise to 225 under similar conditions.
Your stock fans don't come on until 205 and 215 F
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Old 12-27-2006, 11:31 PM   #29
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Quote:
Originally Posted by oldbuick
bonneville is correct be very carefull changing the t-stat on the newer series 2'*. The motor is designed to run with the 195 and you are best to leave it alone. Putting the lower t-stat in will not prevent UIM failure and will in fact cause you problems.
Proven wrong here. Countless times. We have yet to see a single car have issues with one.
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Old 12-27-2006, 11:45 PM   #30
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How many guys here run the cold stat in a 2000+ car?
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