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| spro2395 | 160 T Stat | ||
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Guru Newb
 
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Hey
Does anyone know what effect a 160 degree thermostat will have on milage? |
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Posted on: 2010/3/1 12:55
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| biggrizzly | Re: 160 T Stat | ||
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2011 Memorial Day Car Show Winner!
 
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None - at least in the past two years I've had one installed.
I'm not sure what you want to accomplish with the lower temp stat, but it won't make any difference after the engine gets to operating temps. A change in fan temp turn ons will have more effect as far as engine temps if that's what your after. I put the lower stat in just because the guy that did my heads recomended that with a list of other mods. |
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Posted on: 2010/3/1 13:22
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Don Haller Corvette Club of America 94Coupe, 383Stroka, PeteK Trans, 3000stall, 3.54rear, Konis and bigger sways. |
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| Pcolt94 | Re: 160 T Stat | ||
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Guru Newb
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Probably nothing measurable. It will just take longer to warm up especially in the cold climates. But once the stat opens, it will probably work as the 180 does once engine gets to operating temperature.
The radiator efficiency, operation of the entire cooing system and outside air temperature will set the operating system temperature, not the stat. The stat will set the low end temp, not the high end.  |
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Posted on: 2010/3/1 13:28
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| BillH | Re: 160 T Stat | ||
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The Stig Moderator
 
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Yep, once it' open, it's open.
Won't do anything for mileage or engine temps aside from slower warmup. |
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Posted on: 2010/3/1 16:12
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Every man dies but not every man lives. |
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| jhammons01 | Re: 160 T Stat | ||
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Senior Guru
 
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Why are you wanting a 160° thermostat in the first place?
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Posted on: 2010/3/1 16:21
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| spro2395 | Re: 160 T Stat | ||
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Guru Newb
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It's not that I want to put one in I think it's already there. I'm more curious then anything else. I was thinking that computer controlled engines run richer until they are up to temp right? The stock stat is 180 or 195 in an 85?
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Posted on: 2010/3/1 22:07
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| CentralCoaster | Re: 160 T Stat | ||
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Senior Guru
 
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I think if anything it'd get .001% worse mileage. Worse combustion efficiency.
A 160 will keep it cooler on the highway because it's still regulated by the thermostat when you have that much airflow across the radiator. If your thermostat is always wide open on the freeway, you have a cooling issue, unless it's really hot outside or something. |
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Posted on: 2010/3/1 22:50
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1985 Z51, ZF6 |
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| anesthes | Re: 160 T Stat | ||
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Master Guru
 
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Quote:
Unless you know what you are doing, stick with stock. Lots of back to back testing has shown, running the coolant temp around 180 degrees on Iron heads makes the most power with more spark advance, and a leaner mixture. Aluminum heads, seem to like it to be around 200f. If you can regulate the fans to keep the engine (assuming alum heads) around 200f, you can run a little more spark advance, and dial in a slightly lean WOT AFR and make more power. If you care. -- Joe |
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Posted on: 2010/3/1 23:06
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| Matatk | Re: 160 T Stat | ||
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Webmaster
 
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195 stock. Same as my 89. |
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Posted on: 2010/3/2 0:41
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| spro2395 | Re: 160 T Stat | ||
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Guru Newb
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It does seem to run pretty cool. 155 to 165 on the road and 165 to 175 in light traffic @ 70 outside
I will have to see what it's like when it gets hot. I don't know if it's worth the trouble to change it out Joe |
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Posted on: 2010/3/2 0:52
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| VtVette | Re: 160 T Stat | ||
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Guru
 
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an intelligent thread about T-stats on an auto forum with useful, correct info and not one disagreement?
This place scares the hell out of me sometimes... |
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Posted on: 2010/3/2 2:43
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| jhammons01 | Re: 160 T Stat | ||
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Senior Guru
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When I had a "too" cold of one in there....my temps would drop below 160° and the O/D would kick out....I'd have to drive a mile and get the temps back up for the O/D to work again.
I bought a 185° t-stat and cured that problem. Whoever put the cooler one in there was trying to address the over heating issue the car had. New Radiator, water pump, hoses, flushed and new coolant fixed all those issues.....imagine that...a properly maintained system working as designed. Anyway, now that it is all stock and maintained the need to try stupid ideas like a 160° t-stat no longer was needed. Mine will stay at 210° in the heat of the summer..... |
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Posted on: 2010/3/2 7:35
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| anesthes | Re: 160 T Stat | ||
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Master Guru
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Woah. What application is this!? I know the L98s have no provision for this. Must be a section of code in the LT1 ecm's I wasn't aware of.. -- Joe |
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Posted on: 2010/3/2 11:41
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| vetteoz | Re: 160 T Stat | ||
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Senior Guru
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O/d engagement on the DNE 4+3 is temp related Min O/d operating temp varies by year ; 176F on the early cars to 122F on the '87/'88 cars If temp drops below set point , O/d will kick out or if engine doesn't get hot enough, O/d will never engage. |
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Posted on: 2010/3/2 13:05
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| Vetron87 | Re: 160 T Stat | ||
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Elite Guru
 
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Replaced my stock 195 with a 180 stat. Old stat took a dump. 0 problems with new temp seems to handle hot/humid 100 degree weather a little better. On those hot humid days still gets up to operating temp fine just takes a little longer.
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Posted on: 2010/3/2 13:50
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| jhammons01 | Re: 160 T Stat | ||
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Senior Guru
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That's correct. I've been told the temps were 176° on mine...but it was exactly at 160° when mine would drop out of overdrive (and scare the shit of me). Maybe my temp gauge is messed up, but the fan kicks on if on rare occasion the temps ever reach 227° so....for what that is worth. And only CentralCoaster figured out why my O/D was "malfunctioning" back when I was trying to troubleshoot the damn thing. Me: My DNE drops out of O/D on the highway CC: Was it during that cool day we had a few days ago? Me: Why, yes it was..... CC: change your t-stat Me: WTF? |
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Posted on: 2010/3/2 15:48
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| CentralCoaster | Re: 160 T Stat | ||
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Senior Guru
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In 1985 the minimum coolant temp for overdrive was 140F.
The dash guage and the ecm go off different temp sensors, so that explains the 20F difference. Unless you have an 84, a low temp thermostat won't cause you problems there, UNLESS it's drilled. A drilled tstat can hold the engine temp below the thermostat rating on a cold day. |
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Posted on: 2010/3/2 17:55
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1985 Z51, ZF6 |
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| spro2395 | Re: 160 T Stat | ||
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Guru Newb
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I think two owners ago put a chip in the car. Thats the reason for the low temp stat not a cooling problem. So far no O/D drop out problems!
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Posted on: 2010/3/2 21:41
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| anesthes | Re: 160 T Stat | ||
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Master Guru
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Hrmm. Interesting. I don't have anything for those settings in my bin definition for $6E, and $32B. Did the ECM controll the OD on the 4+3 or a different box? -- Joe |
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Posted on: 2010/3/2 22:23
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| CentralCoaster | Re: 160 T Stat | ||
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Senior Guru
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The ECM controls the overdrive solenoid based on several inputs, including the console switch and engine temp.
Here are the miminum coolant temps by year. 84 = 176F 85 = 140F 86-88 = 122F |
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Posted on: 2010/3/2 23:46
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1985 Z51, ZF6 |
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| anesthes | Re: 160 T Stat | ||
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Master Guru
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I don't have a $32B def lying around, I'll have to look more tomorrow. The code isn't present in $6E, which makes sense, since 1989 would be a ZF6.. I'm kinda curious now if they just used the TCC code, or if their is some special stuff in their for the 4+3 OD.. -- Joe |
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Posted on: 2010/3/3 3:35
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