I think my engine is running to cool now. My temp. averages 140-160º in 50 to 60º weather. I'm using 50/50 coolant, 3 core radiator, Hayden electric cooling fan,Hyper tech fan switch, 160º thermostat. I am using a 3 wire heated o2 senser so I'm sure I'm going into closed loop ok, at lest I think so!
Anyways what can I do to bring it up to 160-180º?

 

just bump up the thermostat? mr gasket 4364 is a 180 degree thermostat.

 

I thought of that, but my chip was burned (from Fastchip) for 160º so I don't know if that will be a problem.

 

So no one has any ideas?

 

A 160 is too cold anyways, unless your chip has been tuned to allow open loop that low. Has it?

 

Yea I told fast chip that I have a 160 thermostat so thats what he set it at to go into closed loop. I have a 180 that I could put in, I just don't know if the ecm will freak out.

 

hmm, my car runs around that temp too... I think my chip is burned for a 160 as well... What problems could that cause?

 

I'm not sure yet, although I took it out for a cruise last week for several hours, the air temp was in the low 60's when I started and started to dip into the upper 50's by late afternoon. Towards the end of my ride I started to notice a slight drop in the rpm's of about 3-400. It would only last for a second, and then it was fine. I noticed that my engine temp. was about 150 degrees. I would say for about the last 20 minutes or so of the ride it would do this about ever1-2 minutes. The car runs fine other than that oddity. I was thinking that due to the cooler temp. change, and my engine running cooler it might have some kind of effect on the performance.

 

actually, these engines love to run cool. I have an L98 and would love to have your problem, my car is tons more responsive around 150-160 degrees. I notice it everytime I drive it, but living in Las Vegas kinda bites my hopes of getting my car to run there..

 

So then I guess I'll just leave it for now, and keep an eyeball on it. Although I don't know how much more decent weather I have before I put the ROC to sleep for the winter!

 

What's the difference between having a 160° and the car running "hot" at 180° compared to simply having a 180° thermostat?

Nothing.

I'd suspect the only reason chip tuners want to know what thermostat you have is to determine when to program the fan to turn on.

 

Besides the fan turning on at the preset temp. That's also when the car goes into closed loop. And being my IROC was not even making it to the 160º at the end of the day which is what the chip is programed at, it was probably not going into closed loop. Although I do have a 3 wire 02 senser, so maybe there's no problem there. But as the outside temp.'s lowered during the cruise on that day I started to notice a drop in the RPM'S periodically of about 3-400 and it would last for about a second. This is when I noticed my engine temp. was below 160º. Up until that day the car was running fine, with no hic-ups. I also was not beating on it, just cruising.