Nissan 370Z Forum - 370Z's and E85?

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Quote:

Originally Posted by TopgunZ (Post 2456237)

So why is it that to reach my uncorrected 400 hp I needed 11psi where guys in cali and such are doing it off 7?

And if your car is running 11's at sea level and u brought it to bandimere at 6000ft you would run 12's.

Because a boost gauge is a relative pressure gauge. It measures the difference between the pressurized air and atmospheric pressure.

Quote:

Originally Posted by T_K (Post 2457458)

Because a boost gauge is a relative pressure gauge. It measures the difference between the pressurized air and atmospheric pressure.

Doesn't it measure vacuum pressure and forced pressure in the manifold?

Quote:

Originally Posted by TopgunZ (Post 2457511)

Doesn't it measure vacuum pressure and forced pressure in the manifold?

Yes but it measure relative to the atmosphere pressure. Atmospheric pressure is zero on a boost/vacuum gauge, at any altitude. So you have to run 2.6psi more boost on the gauge to get the same air pressure in your manifold as the same exact car at sea level. So if you drove down to sea level. And ran the same boost gauge pressure, you will get 2.6psi more manifold pressure than you did in Denver, and make more power (and lean out if you're in a car without MAF sensors or absolute MAP reference, or if you don't have enough fuel for the extra HP)