170 or 190 Thermostat Tuned 5.0
 

How many TUNED 5.0's are running their Tunes with the stock 190 thermostat and why? And how many are running the 170 Thermostat Tuned and why? other words is your tune written for the thermostat your using and are there any negative effects using a cooler thermostat? interested in N/A 5.0's. I live in the south so not as cold here.

I run a 170* t-stat now while tuned. Operating temps used to range from 195*-206*, now the range is 185*-195*

Do you DD this truck mostly and are you concerned that when its cooler out that the truck will not warm up properly and pull more fuel and leave the oil not at the right viscosity, possibly causing some damage? What tune and who's are you running?

Zero worries, truck still reached normal operating temps in winter. I have tunes from 5 star and MPT and yes I DD the truck.

sub'd. im still on stock as I thought that only the tuned eco's were putting in cooler thermos. i run 199-203 when at full operating temps.

not sure how a 170 vs a 190 wood efect running, but this past winter in oregon we had 7 days post snow storm of blue bird sun but temp never past 28* F, and though i gave my 5.0 about 10 minutes to warm up that would put me on edge just a hair.

I did mine mainly because I go to the track from time to time and just wanted to keep the between runs heat under control.

This is what i thought most do who run the 170. I ran mine for about a couple years off and on between winter and summer. I kinda got tired of switching it out and left it in one winter. Then of course went back to stock for well over a year now due to the oblong cylinder bore distortion aka (the knock) early 5.0's have. I was diagnosed and a new short block was installed about 2 months ago. My truck started knocking at about 26,000 until replacement at 52,000. I now have about 2,000 on the new short block and running perfect. I never go to the track just mixed driving on a daily basis. So really wondering how many really need and get the benefit of cooler temp and probably some that may not need it, depending on use, tune and location. Here is what Reische says about their 170 T-stat http://reischeperformance.com/FG5data.html

Ok, so your tune and fan settings are for the stock 190 thermostat and you have pretty cold winters. So you never get any ping or audible knock? have you data logged or checked with your tuning device to see your knock numbers especially in the summer?

Anyone else? I know there are a lot more tuned 5.0's, just curious how many are running performance tunes on the stock thermostat with those fan settings.

I put a 170 in my truck and had the tune modified for it, cylinder head temps on the stock tstat were 210-215, and with the 170 tstat they are 185-190. My heat comes out of the vents at 180 so I leave it in all year long.

I installed the 170 tstat in my 5.0 because of the poor coolant flow at the back of the cylinder heads that has been found to cause issues on cylinders 7 & 8 in 5.0s that are run very hard with aggressive tunes, nitrous, or forced induction.