It has nothing to do with racing, it has to do with keeping your car cool. Colder = less knock & the less knock you have the better. You don't have to be racing to have KR.. When people switch down to a 3.4, at the very least you should be using a COOLER range spark plugs, a COLD air intake, and a 180* t-stat which makes your car run COOLER.

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U-bend/ResDelete// 3.4"// MSD 8.5mm// TR6s// ZZP 1.0 PCM// 72mm TB w/ TB spacer// WizAired CAI// 180° tstat
Best ET (stock): 14.689
Best Trap (also stock): 93.82

I get 27 on the highway with a stock T stat and with a 180 I get only like 23MPG

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http://www.cardomain.com/ride/3059486

Something is definitely wrong if you loose that much just by changing 15* worth of thermostat.

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04 Indy SS build #972
XP, TOG's, Lightning injectors, 2.8 pulley, 105 CC springs, Wizaired, 3.29 gears, tripleedgeperformance ported blower, machined LIM, 180* tstat, RS12YC@.053, FP rewire, Alt rewire, stage 1 V boost, PRJ wires, Stage 2 IC

I understand what you are saying about keeping your car cool. But why? A cooler car does not run better. In fact it is the complete opposite. A hotter car will run better, faster, more HP, more efficiency, etc under the same conditions.

The only thing a cooler engine will do is reduce knock IF you have knock. If you don't have knock, no reason to run a cooler t-stat. Consider Nascar. They are running engine temps around, or over 250°F. The key is setting your engine up with the appropriate mods to not have knock. Then you don't need to run a cooler t-stat to try and cheat the engine.

Again, if you can't run your car with a 3.4 pulley and a stock t-stat without getting knock, and need to revert to a cooler t-stat just so you can drive, you need more supporting mods.....not a cooler t-stat.

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1997 GTP - 200k+ miles, PEMs, 3" SS Exhaust w/ Borla Mufflers, 3.4", 180* stat(summer), FWI, 1.84 RR, PT, SLP hood, KYB GR2s, GMPP Handling Kit, etc...

i drive my car fairly aggressive, and didn't really plan on getting the 180*tstat, but if i drop my pulley size to a 3.4'' i should deffinatley get the t stat?

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http://www.cardomain.com/ride/3055051

Yes.

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04 Indy SS build #972
XP, TOG's, Lightning injectors, 2.8 pulley, 105 CC springs, Wizaired, 3.29 gears, tripleedgeperformance ported blower, machined LIM, 180* tstat, RS12YC@.053, FP rewire, Alt rewire, stage 1 V boost, PRJ wires, Stage 2 IC

and i can just pick one of thos up at a NAPA or something right?

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http://www.cardomain.com/ride/3055051

Again, I disagree here. I am running a 3.4 pulley and don't have any problems with knock because I have the appropriate supporting mods. You should not drop a pulley size until you can safely run it without knock. Throwing in a t-stat as a band aid is not a wise move. Stick with the stock t-stat until you get to the track, even with a 3.4 pulley.

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1997 GTP - 200k+ miles, PEMs, 3" SS Exhaust w/ Borla Mufflers, 3.4", 180* stat(summer), FWI, 1.84 RR, PT, SLP hood, KYB GR2s, GMPP Handling Kit, etc...

The best thing to do is to read up on the subject from reliable sources..ie published articles.

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04 Indy SS build #972
XP, TOG's, Lightning injectors, 2.8 pulley, 105 CC springs, Wizaired, 3.29 gears, tripleedgeperformance ported blower, machined LIM, 180* tstat, RS12YC@.053, FP rewire, Alt rewire, stage 1 V boost, PRJ wires, Stage 2 IC

Not true.Not for us anyway. I have never ever seen any .bin file where a car stays in closed loop untill any where NEAR that tempeture.The ECT for closed loop on a stock 2000 GTP is about 50*F, and a stock 98 GTP is about 76.1*F. Even for corvette's ect...The cupple .bin files I have seen for them the Closed Loop ECT is no where near that. I can also promise you that by installing a 160 thermostat will not wash down your cylinders because of excessive fuel or colder block temps.


I would have to agree on the mpg loss. Even though I have not seen any concreate results from myself mostly because I have not been keeping a close eye on it.....

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1999 Silver GTP~HP Tuners~XP cam~ZZP FS Intercooler~#4 FMHE~ZZP 78mm Billet Throttlebody~LQ4 MAF~Lucas 42.5's~ZZP SS Headers~2.8 MPS~PRJ fuel logs~Ported & Polished S/C~TDCRacing FWI ~Built Tranny-3.29's-7/8's chain-Intense forged Input Shaft~

Running mid-high 12's
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