High altitude boost
Thread Starter
Newbie
Joined: Sep 2008
Posts: 52
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From: Mexico City
High altitude boost
Hey guys,
Im planning to shortly reinstall the turbo in my RA. The this is that I live in Mexico City, that's 7500 feet above sea level so atmosferic pressure is 3.5 psi less than at sea level (11.2 vs 14.7 psi).
I am planning to boot somewhere between 8 psi, so when I measure 8 psi on my boost gauge the ABSOLUTE pressure entering the manifold will be 11.2+8= 19.2psi inestead of the 22.7 psi you will find at sea level with the same measured (relative) 8psi.
So my question is: could I got to 11.5 psi measured by the boost gauge with the same safety of a 8psi measured at sea level?
Thoughts, comments?
Im planning to shortly reinstall the turbo in my RA. The this is that I live in Mexico City, that's 7500 feet above sea level so atmosferic pressure is 3.5 psi less than at sea level (11.2 vs 14.7 psi).
I am planning to boot somewhere between 8 psi, so when I measure 8 psi on my boost gauge the ABSOLUTE pressure entering the manifold will be 11.2+8= 19.2psi inestead of the 22.7 psi you will find at sea level with the same measured (relative) 8psi.
So my question is: could I got to 11.5 psi measured by the boost gauge with the same safety of a 8psi measured at sea level?
Thoughts, comments?
Evolved Member
Joined: Aug 2004
Posts: 528
Likes: 0
From: Canada
The 4G49 seems to take to 12psi OK with proper tuning. In theory you probably would be OK with 11.5 but again this is dependant on tuning. 3 years ago I tuned a car for Pike's Peak and ended up modifying the boost profile in a similar fashion. The driver said it made a big difference when he was close to the end of the race.
-Michael
-Michael
