Nissan 370Z Forum - View Single Post - What works/doesnt work with the GTM stg 2 SC?

Staples · 01-31-2012, 01:16 AM

What you're reading on the forum relates to the stage 1 system. The Rotrex supercharger that is being used in the stage 2 (c38-91) system is big unit (biggest charger Rotrex offers) with a 4.5" inlet. That helps flow a lot more air into the engine which you won't lose as much boost if you're running a non-restrictive exhaust (long tube headers, ect).

With the stage 1 and a non-restrictive exhaust a lot of people were getting Valve Overlap (both sets of valves, intake and exhaust, open up at the same time) because the air would be forced into the intake, but wouldn't be given enough time for combustion process and was just being pushed out the exhaust side. People were losing 1 - 2lbs of boost because of it and that's why they were selling off their parts.

At the end of the day, VVEL is the main reason for this issue. I think the cam duration is around 300 which is extremely aggressive for a street car, but the ECU is able to keep the idle in check. When your cars warmed up and you listen to it, you can hear a slight lope.

01-31-2012, 01:16 AM	#6 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 16	What you're reading on the forum relates to the stage 1 system. The Rotrex supercharger that is being used in the stage 2 (c38-91) system is big unit (biggest charger Rotrex offers) with a 4.5" inlet. That helps flow a lot more air into the engine which you won't lose as much boost if you're running a non-restrictive exhaust (long tube headers, ect). With the stage 1 and a non-restrictive exhaust a lot of people were getting Valve Overlap (both sets of valves, intake and exhaust, open up at the same time) because the air would be forced into the intake, but wouldn't be given enough time for combustion process and was just being pushed out the exhaust side. People were losing 1 - 2lbs of boost because of it and that's why they were selling off their parts. At the end of the day, VVEL is the main reason for this issue. I think the cam duration is around 300 which is extremely aggressive for a street car, but the ECU is able to keep the idle in check. When your cars warmed up and you listen to it, you can hear a slight lope. __________________ '08 Infiniti G37s - Forced Induction Fed Last edited by Staples; 01-31-2012 at 01:18 AM.