Boost reference question
02-18-2008, 04:56 PM
#1
TECH Resident
Thread Starter
iTrader: (12)
Join Date: Feb 2007
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
Boost reference question i removed my fuel evap sensor/hoses to clean up stuff under the hood. Just got a Aeromotive FPR and it needs that for vaccum. couldn't i just tap into the three tee i have setup that the boost gauge and BOV feed off of?
i hated looking at the evap stuff on the intake.
i hated looking at the evap stuff on the intake.
02-20-2008, 09:04 AM
#5
Coal Mining Director
iTrader: (17)
Join Date: Nov 2001
Location: Virginia
Posts: 4,442
Likes: 0
Received 0 Likes
on
0 Posts
It's all personal preference. I "like" to reference mine with boost only so I tap the inlet pipe before the throttle body (not past the TB into the manifold). That way you can set the fuel pressure at idle without vac pulling the pressure lower. Say set it at 58psi and it stays at 58 reguardless of manifold vac. Then when you go into boost, the fuel pressure rises 1:1. So 10psi of boost = 68psi of fuel. To do that you set the injector IFR up as a climbing slope... I "like" it this way since it does not create a big fuel pressure delta that slams the pump..
Set up with a manifold tap the 58 idle psi would drop to 43psi (at -15 and this varies) and under boost go back to 68psi...that is a 25psi slam on the fuel pump....it still works but I don't "like" that much pressure delta....plus the injector IFR becomes a constant number.
Set up with a manifold tap the 58 idle psi would drop to 43psi (at -15 and this varies) and under boost go back to 68psi...that is a 25psi slam on the fuel pump....it still works but I don't "like" that much pressure delta....plus the injector IFR becomes a constant number.
02-20-2008, 10:33 AM
#6
12 Second Club
iTrader: (6)
Join Date: Jun 2004
Location: Ft. Irwin, California (But Virginia is home)
Posts: 1,501
Likes: 0
Received 7 Likes
on
1 Post
It's all personal preference. I "like" to reference mine with boost only so I tap the inlet pipe before the throttle body (not past the TB into the manifold). That way you can set the fuel pressure at idle without vac pulling the pressure lower. Say set it at 58psi and it stays at 58 reguardless of manifold vac. Then when you go into boost, the fuel pressure rises 1:1. So 10psi of boost = 68psi of fuel. To do that you set the injector IFR up as a climbing slope... I "like" it this way since it does not create a big fuel pressure delta that slams the pump..
Set up with a manifold tap the 58 idle psi would drop to 43psi (at -15 and this varies) and under boost go back to 68psi...that is a 25psi slam on the fuel pump....it still works but I don't "like" that much pressure delta....plus the injector IFR becomes a constant number.
Set up with a manifold tap the 58 idle psi would drop to 43psi (at -15 and this varies) and under boost go back to 68psi...that is a 25psi slam on the fuel pump....it still works but I don't "like" that much pressure delta....plus the injector IFR becomes a constant number.
Yep, that's exactly how mine's set up
+1 for the intake. 