Cobb tuning intake test
03-03-2008, 07:15 PM
#62
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I think it is necessary to point out that the brand “N” system is specifically made for the 350Z and most defiantly NOT the G 37. We have concluded as Cobb has, that there is no better way to go than the stock intake system we have dyno tested a fleet of these cars with an amazing array of intakes (and those tested in the Cobb test) as well as others and in every instance, there was a power degradation. (Strangely this is not the case with the 350Z) We even changed the MAF output to see if there was any way to coax more power form the car and that was met with failure. Because we have some electronic skills here with respect to slewing the MAF output signal, we even tried larger diameter intakes with obvious more flow to no avail.
As far as intake flow goes we were able to gain 18% more flow but that did nothing for power which suggests that there may be an issue downstream of the intake system. For example, the Nissan ECU's control the valve timing for best torque while creating a small amount of exhaust backflow into the engine (via exhaust cam timing) for NOx control, no intake system can overcome that situation. Aside from the variable cam timing, the drive by wire (DBW) regulates the throttle opening and on our testing we see that the throttle opening changes as air flow was increased which effectively cost power.
We were able to get a gain of 3-4 hp at the wheels but the system we made to do this would not even get close to fitting in the engine compartment. I will say that what we did do incorporated the stock air boxes. We will not be marketing a system until there are tangible gins.
JC
As far as intake flow goes we were able to gain 18% more flow but that did nothing for power which suggests that there may be an issue downstream of the intake system. For example, the Nissan ECU's control the valve timing for best torque while creating a small amount of exhaust backflow into the engine (via exhaust cam timing) for NOx control, no intake system can overcome that situation. Aside from the variable cam timing, the drive by wire (DBW) regulates the throttle opening and on our testing we see that the throttle opening changes as air flow was increased which effectively cost power.
We were able to get a gain of 3-4 hp at the wheels but the system we made to do this would not even get close to fitting in the engine compartment. I will say that what we did do incorporated the stock air boxes. We will not be marketing a system until there are tangible gins.
JC
03-07-2008, 02:57 PM
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So what happened here: https://www.myg37.com/forums/intake-and-exhaust/176306-fujita-intake-before-and-after-dyno-run.html ??
Man the wind blows hard in this forum...
Man the wind blows hard in this forum...
03-07-2008, 03:59 PM
#75
So what happened here: https://www.myg37.com/forums/showthread.php?t=176306 ??
Man the wind blows hard in this forum...
Man the wind blows hard in this forum...