370Z's and E85?

TopgunZ

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.

MyKindaGuise

Are you running a 100% identical setup to "the guys in cali"?

__________________
|445whp398tq|
|BW S259 Turbo|3" Downpipe\Exhaust|ID1000|AeroMotive|Tial|EcuTek|BC BR|S0-4|MaffFab|
MKGs-Single-Turbo

phunk

You need to give me more details, this information is way too vague to begin to analyze. You may be comparing to the highest HP/quickest ET of them all at sea level and assuming you would do as well? Well I'm in Chicago and my 370z didn't run a 12.9 bone stock like another guy did somewhere else - altitude isn't everything.

Again, you do get a loss from altitude, but you do not get as much as a loss as SAE will wrongly tell you. The SAE, literally says, that their own correction factor for altitude cannot be applied to boosted engine. You can literally find endless discussion about this. SAE in Denver on a turbocharged vehicle will always produce grossly inflated numbers... It was predicted by the SAE, and it was proven by the tuning/racing industry.

Anyway, your altitude would suggest that it would take at least 2.6 psi more boost to make the same uncorrected power as at sea level on a turbo vehicle. Probably a little more due to reduced intercooler efficiency.

__________________

T_K

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

TopgunZ

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

phunk

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)

__________________