FI and fuel demands
05-07-2007, 10:12 AM
#1
TECH Regular
Thread Starter
iTrader: (3)
Join Date: Jul 2005
Location: Bossier City LA
Posts: 449
Likes: 0
Received 0 Likes
on
0 Posts
FI and fuel demands Don't know if this is the right section, but I've got a fuel related question. If I am "boost referenced" when the car is sitting at a nice idle and I rev the throttle, the boost gage goes from vac to boost... that quick. In boost, since the fuel sys is "Boost referenced" she adds fuel. The problem is when the car idles down she has alot of fuel in her "rich" that she dosen't need... this causes stumbling, fouling and or kills the car until the excess fuel is burned off. How do you get a FI car to over come this?
Any help appreciated.
Any help appreciated.
05-07-2007, 07:06 PM
#2
Essentially the fuel pressure should react as fast as the manifold pressure, so there is no theoretical incorrect fueling issue when returning to idle.
The boost reference is not to richen the mixture, but to keep the pressure constsant with the boost level. For example 58# with 0 boost & 68# with 10# boost. This equates to the same pressure drop across the injector to keep the fuel flow consistant with the same pulsewidth.
If your car stumbles & acts up when returning to idle, you have another problem.
Hope this helps.
The boost reference is not to richen the mixture, but to keep the pressure constsant with the boost level. For example 58# with 0 boost & 68# with 10# boost. This equates to the same pressure drop across the injector to keep the fuel flow consistant with the same pulsewidth.
If your car stumbles & acts up when returning to idle, you have another problem.
Hope this helps.
Last edited by Lonnies Performance; 05-07-2007 at 07:24 PM.