Manufactured by Adapt Lab
“THIS RESTRICTOR FITS THE FOLLOWING UZ ENGINES WITH THE WATER INLET HOUSING SHOWN IN THE PHOTOS ABOVE. THIS SHOULD CONSIST OF 1UZ NON VVTI, 2UZ VVTI, 3UZ VVTI.”
The Coolant Bypass Restrictor for the UZ family of engines was created to help push the performance capabilities of the engine. It is not solely about lowering temperatures but controlling the engine temperatures. The coolant range is still at OEM operating temperatures but never getting to a point that could damage the engine. It is a solution to many while being simple and effective. What is included is a Billet Aluminum restrictor that is designed to be tolerance fit into the thermostat housing.
In testing the coolant bypass restrictor (paired with the OEM thermostat) has placed the operating range of the coolant temperature of the engine at 190-200F (88-93C) in cruising, spirited driving, drifting or track sessions while still retaining a quick warm up time like OEM.
WARNINGS:
1) A colder thermostat ALONE will not have the same result as the coolant bypass restrictor but using a 170F (76C) thermostat WITH the restrictor will maintain your temperatures in the 183-193F (84-89C) range.
2) Corrosion in your coolant system may cause fitment issues when installing the restrictor. Lightly sanding and cleaning the inlet is highly recommended before installing.
3) A Dead Blow Hammer is highly recommended when installing the restrictor into the housing to prevent damage to the restrictor or the housing. The restrictor should be pushed in by hand as much as possible before using the Dead Blow Hammer to get a flush fitment.
The Coolant Bypass Restrictor fits the following models:
-1UZ-FE Non VVTI
-2UZ-FE VVTI
-3UZ-FE VVTI
*If you have the housing with a removable 2 bolt side barb (as pictured with red X ) then this WILL NOT FIT. (which has been found on 1UZ VVTI and 2UZ Non VVTI engines).