thermostat

[Chevysmallblock]

I just changed from the stock 195 degree thermostat to a ac delco 160 and my 92 camaro seems to be running stronger. Is this just me or is this normal

[Chevyracincamaro]

its normal. a cooler engine runs more efficiently and makes more power...

[DaMoNe6969]

Your fuel economy will also go down and your emissions will go up

[Chevyracincamaro]

yeah i never understood that: why does the fuel economy go down??

[DaMoNe6969]

When your engine is cold and warming up, it runs a pre set fuel/air mixture ratio from the ECM.. Once it reaches operating temp, it turns to the oxygen sensors to provide the fuel/air mixture info.. A 160 degree thermostat wont let the engine fully reach the normal operating temp so your air/fuel might be messed up while your drivin'

If your interested, you could get a hypertech thermomaster power chip.. It'l lower your engine operating temp, turn your fans on earlier and allow you to run a 160 degree tstat..

[Chevyracincamaro]

what is the operating temp, 180?

[1992RS]

Yup, that thermomaster chip will let you run the cooler temp and not sacrifise the emissions and fuel economy

[Chevyracincamaro]

word...

[Chevysmallblock]

Sweet i ordered the Chip this morning and it will be shiped tomorow I will report on the results

[Chevyracincamaro]

word, again...

[Chevysmallblock]

The chip just came in. I got the thing in in like 15 minutes and instant improvment. My rpms settled back down fron the 160 thermostat change and the hps went up enough to feel the difference TBI CHIPS is ok in my book

[Hypsi87]

Originally Posted by DaMoNe6969

When your engine is cold and warming up, it runs a pre set fuel/air mixture ratio from the ECM.. Once it reaches operating temp, it turns to the oxygen sensors to provide the fuel/air mixture info.. A 160 degree thermostat wont let the engine fully reach the normal operating temp so your air/fuel might be messed up while your drivin'

If your interested, you could get a hypertech thermomaster power chip.. It'l lower your engine operating temp, turn your fans on earlier and allow you to run a 160 degree tstat..

wrong, since you have dropped 35 degrees in temp, everything is cooer including your aircharge. sooo, colder air is more dense, more dense air needs more fuel to support it. There ya go

[4onFloor]

Originally Posted by DaMoNe6969

If your interested, you could get a hypertech thermomaster power chip.. It'l lower your engine operating temp, turn your fans on earlier and allow you to run a 160 degree tstat..

the ecm has nothing to do with the fans. the fan(s) run on a completely diferent circuit.

a relay is powered by the ignition switch, and is tripped by the fan switch and the AC switch

[DaMoNe6969]

Originally Posted by Hypsi87

wrong, since you have dropped 35 degrees in temp, everything is cooer including your aircharge. sooo, colder air is more dense, more dense air needs more fuel to support it. There ya go

I said the a/f ratio might be off.. And although the denser air will compensate a little bit.. Your engine is still in open loop operation, and it cant increase or decrease fuel delivery accordingly, therefor the engine wont be running at peak efficiency.. There is no closed loop gain

[Chevyracincamaro]

actually that might not be entirely true. i have a diagnostic scanner for OBD I/II cars. i also have a 160 degree thermostat and when i got the scanner i obviously used it on my car. i used the real-time monitoring feature and it said my car was running in closed loop...