Last year at PRI we approached Supertech and spoke to them about the possibility of having +1mm oversized valves developed for the VHR as no other company was offering this and we believed these items would benefit this platform tremendously. Fast forward to the end of March this year and we currently have the very first set of +1mm valves for the VHR platform!
+1mm Oversized Intake Valve & Stock Valve
A comparison between the stock intake valve and the Supertech valve, you can see a slight difference in overall diameter (increasing to 100.2 mm) and a slight recess in the bottom of the valve. The Supertech valves are one piece forged made out of EV8 (21-4N) stainless steel and will usually come with a black nitride coating. Since these were the prototype intake valves they did not come black nitride coated from Supertech due to a time constraint, but we will be getting them coated and orders from this point forward will come black nitride coated.
+1mm Oversized Exhaust Valve & Stock Valve:
Comparing the stock exhaust valve and the Supertech valve, you can see a slight difference in overall diameter (increasing to 94.7 mm) and a larger recess in the bottom of the valve. The Supertech valves are a one piece forged made out of Inconel 751 to withstand the very high temperatures seen for turbo or supercharger applications.
While will be incorporating these valves into our NISMO engine build, we will not have them installed into the head in time for ZDayZ due to time constraints and a few other variables. We will however have the valves on display at ZDayZ and we will be taking orders as these valves can only be purchased from us at this time. If you are looking to maximize your engine output these are going to be a "must-have" as we all know how well they performed on the DE platform as far as making power more efficiently!