Thread: Thermostats... Which one is really right... and why?

Don't need to examine all the particulars in a platform such as ours that's been around for more than a decade, just go with the flow. 180* drilled Tstat is where's its at!

Adjust the PCM for it and your done.
: )

in most cases where outside temperatures don't stay very high (arizona, texas, etc.) you really shouldn't ever need a lower thermostat. having lower coolant temperatures is just keeping the motor from legitimate running temperatures and you're just wasting gas then. wear and tear on the motor is also accelerated, although it's probably not very noticeable for a really long time.

i don't recommend thermostats to people anymore. it was something they had to do in 1997 and early years because they had no tuning software. it's very old school logic and it doesn't really apply.

I'm totally OLD school and seriously, in Arizona, a colder Tstat in 114* weather isn't going to help all that much, lol.


I've seen plenty of posts about the engine running at the correct temp, but have yet to see anything backing it up (dyno). Personally, I think the IAT is going to effect your gas usage more than the engine (coolant) temp. Furthermore, running a smaller pulley will further distance the combined effect of coolant vs air temp with regard to fueling. Once modded and spinning that SC faster (pulley), is going to negate any effect of a cooler Tstat, or what a cooler Tstat can do. But like I said, I am totally old school, I like keeping my engine cooler. For the record, has been done way before 97'... My 73' Grand Am had a drilled colder Tstat which was totally removed in the summer.


Just looking for an expansion on your logic Bio, I'm always learning and these are all just my opinion of course : )

you explained exactly my thought process.

it ain't broke, don't fix it.