Nissan 370Z Forum - View Single Post - GT-R R35 Plenum Test Fitment on my VQ37HR

ChrisUR · 12-21-2011, 05:12 PM

yes, I made some dyno runs before - stock car - only exhaust (Topspeed catback) - catback + stillen gen3

so I have a good idea if the manifold will gain or loose when we do another dyno with it installed.

the main region I hope to see gains for NA cars with this conversion is that our design combined with the excellent gtr mani has a greatly improved airflow as the runners are now round instead of square and the runners are longer and going independently into the tanks and there are no sharp edges inside the manifold like with the stock one.

I guess that is the reason why the M370 looses power in the high rpm range. My guess would be that they cut the runners inside going into the plenum to enlarge the volume but this sacrifice the airflow.

Haven't seen the M370 in person but after looking at the stock manifold that is about the only thing they really can do as this is a plastic piece and you cannot really enlarge or polish anything like you would do with a cast unit.

Chris

12-21-2011, 05:12 PM	#40 (permalink)
ChrisUR Base Member Join Date: Jun 2010 Location: Germany Posts: 116 Drives: 370Z Black Edition Rep Power: 15	yes, I made some dyno runs before - stock car - only exhaust (Topspeed catback) - catback + stillen gen3 so I have a good idea if the manifold will gain or loose when we do another dyno with it installed. the main region I hope to see gains for NA cars with this conversion is that our design combined with the excellent gtr mani has a greatly improved airflow as the runners are now round instead of square and the runners are longer and going independently into the tanks and there are no sharp edges inside the manifold like with the stock one. I guess that is the reason why the M370 looses power in the high rpm range. My guess would be that they cut the runners inside going into the plenum to enlarge the volume but this sacrifice the airflow. Haven't seen the M370 in person but after looking at the stock manifold that is about the only thing they really can do as this is a plastic piece and you cannot really enlarge or polish anything like you would do with a cast unit. Chris __________________ ProStreet N1 exhaust \| ProStreet N1 Y-Pipe \| STILLEN G3 Intake \| NST Pulley Kit EIBACH Pro-Springs \| EIBACH Pro-Spacers \| EIBACH Sway Bars \| SEIBON GT2 Rear Wing MOCAL Oil Cooler 25row\| STILLEN TransCooler \| STILLEN PS Cooler \| STILLEN Front Fascia