Which billet thermostat housing + thermostat?

Tay · 11-22-2020, 12:00 AM

Which brand billet thermostat housing, which thermostat to go with it and which temperature?

The Katech looks good but which temperature? 160 or 174? Which billet housing will it fit?

Any other suggestions?

ZLE used for road racing.

JSH · 11-22-2020, 09:03 AM

I have the 160

*Joshinator99* · 11-22-2020, 09:41 AM

Katech is the only tstat to use IMO. Mishimoto, Weapon X, etc are all junk and will overheat your car when they fail. Use the 160 if you are tuning your ECM and use the 174 version if you need to keep the stock tune.

Stephen12ZL1 · 11-22-2020, 11:34 AM

Katech

Bangkok_ZL1 · 11-22-2020, 11:50 AM

Quote:

Originally Posted by Joshinator99

Katech is the only tstat to use IMO. Mishimoto, Weapon X, etc are all junk and will overheat your car when they fail. Use the 160 if you are tuning your ECM and use the 174 version if you need to keep the stock tune.

Do you have to tune your ECM to use a 160???? How the hell does the ECM know this? these new cars are wild. I remember when I ran a car without the thermostat totally (froze closed so I removed it). Ran great for years without it, just took a while to warm up, and never got warm to hot..... Anyways, wow, new cars man, amazing. Since I live in hot-ass Udon Thani, Thailand, I'd love to change my Thermo down as far as possible. Its damn near December and it was 94 today. Went to the CRV to get the tools to fix a seat belt issue on a friends car and the socket roasted my hand and my CRV windows are totally shaded. There are thre seasons here, Hot, Very Hot, and Freakin Blazing. So the 1st thing I do when I get the ZL1 next week is protect her against the sun. So a low Temp Thermo would be good.

JSH · 11-22-2020, 01:05 PM

Quote:

Originally Posted by Bangkok_ZL1

Do you have to tune your ECM to use a 160???? How the hell does the ECM know this?

I do not believe a tune change is necessary for the 160F as I don't believe HPE tuned for mine.

*Joshinator99* · 11-22-2020, 01:17 PM

Quote:

Originally Posted by JSH

I do not believe a tune change is necessary for the 160F as I don't believe HPE tuned for mine.

False. If you don't change the mechanical thermostat setting in the tune, you will get a code for the car not coming up to the expected temp.

swisstyphoon · 11-22-2020, 01:29 PM

https://briantooleyracing.com/amp-bi...5-amplt4h.html and a Katech 174 Thermostat.
Tune is needed for a 160°!!

JSH · 11-22-2020, 01:33 PM

I've never gotten that code and it runs when hot at +/-185F but it takes awhile to get up there. I'm not convinced there's any measurable benefit of this thermostat.

*Joshinator99* · 11-22-2020, 03:05 PM

Quote:

Originally Posted by JSH

I've never gotten that code and it runs when hot at +/-185F but it takes awhile to get up there. I'm not convinced there's any measurable benefit of this thermostat.

Your car is tuned, so you wouldn’t get the code...

*Joshinator99* · 11-22-2020, 03:14 PM

Quote:

Originally Posted by Bangkok_ZL1

Do you have to tune your ECM to use a 160???? How the hell does the ECM know this? these new cars are wild. I remember when I ran a car without the thermostat totally (froze closed so I removed it). Ran great for years without it, just took a while to warm up, and never got warm to hot..... Anyways, wow, new cars man, amazing. Since I live in hot-ass Udon Thani, Thailand, I'd love to change my Thermo down as far as possible. Its damn near December and it was 94 today. Went to the CRV to get the tools to fix a seat belt issue on a friends car and the socket roasted my hand and my CRV windows are totally shaded. There are thre seasons here, Hot, Very Hot, and Freakin Blazing. So the 1st thing I do when I get the ZL1 next week is protect her against the sun. So a low Temp Thermo would be good.

Yep, see the attached screenshot from HP Tuners showing where you need to make the change to 160 once you install the new thermostat. The car has a 194 thermostat setting from the factory, so if the car runs for a while and doesn't get to 194, you get a code.

With the Katech 160 thermostat and new fan settings (see second pic), my car cruises in the 170-180 degree range, which is perfect IMO.

Tay · 11-22-2020, 05:56 PM

Thanks for everyones input.

PROMETHEUS · 11-22-2020, 07:05 PM

I change the tstat in my C7 and I dont believe it required a tune, however, the fans needed to be adjusted in accordance with the tstat. I would suspect it would be the same for the ZL1.

Z OH 6 · 11-22-2020, 07:38 PM

Quote:

Originally Posted by Joshinator99

Katech is the only tstat to use IMO. Mishimoto, Weapon X, etc are all junk and will overheat your car when they fail. Use the 160 if you are tuning your ECM and use the 174 version if you need to keep the stock tune.

Interesting, I ran a 180 degree Mishimoto in my Hellcat for almost 4 years without issue.

11-22-2020, 12:00 AM	#1
Tay Drives: 1985 Oldsmobuick Join Date: Oct 2012 Location: San Diego Posts: 202	Which billet thermostat housing + thermostat? Which brand billet thermostat housing, which thermostat to go with it and which temperature? The Katech looks good but which temperature? 160 or 174? Which billet housing will it fit? Any other suggestions? ZLE used for road racing.

11-22-2020, 09:03 AM	#2
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 4,147	I have the 160 __________________ 2020 ZL1LE A10. LME LT4 390 short block, CID Heads, Kong E2650, FBO. 15" conversion, Nitto 555Rii or MT ET Street R or Toyo Proxes RR. 100 octane: 1045hp/1055tq. 100 octane + Alky MAF Meth (1) 10+:

11-22-2020, 09:41 AM	#3
Joshinator99 Moderator Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 6,198	Katech is the only tstat to use IMO. Mishimoto, Weapon X, etc are all junk and will overheat your car when they fail. Use the 160 if you are tuning your ECM and use the 174 version if you need to keep the stock tune. __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)

11-22-2020, 11:34 AM	#4
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,824	Katech __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

11-22-2020, 01:29 PM	#8
swisstyphoon Former GM Technician Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009 Location: Switzerland Posts: 396	https://briantooleyracing.com/amp-bi...5-amplt4h.html and a Katech 174 Thermostat. Tune is needed for a 160°!! __________________ 2018 Camaro ZL1 A10 Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, DSX dual intank pump, Lingenfelter high flow check valve, Motion Raceworks Flex Fuel adapter, LPE Big Bore Hpfp, XDI 30% Injectors, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: SwissZL1

11-22-2020, 01:33 PM	#9
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 4,147	I've never gotten that code and it runs when hot at +/-185F but it takes awhile to get up there. I'm not convinced there's any measurable benefit of this thermostat. __________________ 2020 ZL1LE A10. LME LT4 390 short block, CID Heads, Kong E2650, FBO. 15" conversion, Nitto 555Rii or MT ET Street R or Toyo Proxes RR. 100 octane: 1045hp/1055tq. 100 octane + Alky MAF Meth (1) 10+: Last edited by JSH; 11-22-2020 at 01:54 PM.

11-22-2020, 05:56 PM	#12
Tay Drives: 1985 Oldsmobuick Join Date: Oct 2012 Location: San Diego Posts: 202	Thanks for everyones input.

11-22-2020, 07:05 PM	#13
PROMETHEUS Drives: 2019 ZL-1, Shadow Gray, Sold Join Date: Jan 2019 Location: Fredericksburg, VA Posts: 1,390	I change the tstat in my C7 and I dont believe it required a tune, however, the fans needed to be adjusted in accordance with the tstat. I would suspect it would be the same for the ZL1.

User Name		Remember Me?
Password