DIS: aftermarket system - ZR-1 Net Registry Forums

LGAFF · 07-19-2011

Seems like he understands the basic GM setup?

XfireZ51 · 07-19-2011

One of the other ways of increasing fueling capacity is through increasing fuel pressure. I believe the C6 ZR uses a similar strategy with 3 stages of FP changes. Using 16 injectors on our ZRs allows a controllable pulse width at idle while still having sufficient fuel
flow at 7000rpm. Prior to the ZR, I worked for several years on boosting power on my Xfire from stock 205 to modded 350chp. The stock injectors would go static trying to keep up w WOT fueling. Larger 80psi injectors would work ok for WOT but you couldn't control pulse width well enough for idle. The solution was a modified ECM code that implemented a variable Base Pulse Constant based on Vacuum. This required the use of an external fuel pressure regulator that varied pressure vs. vacuum. So my fuel pressure would vary from
10psi at idle to 20psi @ WOT. The ECM code accommodated the change in pressure constantly recalculating fuel flow. Pretty cool stuff.

LGAFF · 07-19-2011

Dropped a note on the LPE facebook page to see what they think

07-19-2011	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: DIS: aftermarket system Seems like he understands the basic GM setup? __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-19-2011	#2
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: DIS: aftermarket system One of the other ways of increasing fueling capacity is through increasing fuel pressure. I believe the C6 ZR uses a similar strategy with 3 stages of FP changes. Using 16 injectors on our ZRs allows a controllable pulse width at idle while still having sufficient fuel flow at 7000rpm. Prior to the ZR, I worked for several years on boosting power on my Xfire from stock 205 to modded 350chp. The stock injectors would go static trying to keep up w WOT fueling. Larger 80psi injectors would work ok for WOT but you couldn't control pulse width well enough for idle. The solution was a modified ECM code that implemented a variable Base Pulse Constant based on Vacuum. This required the use of an external fuel pressure regulator that varied pressure vs. vacuum. So my fuel pressure would vary from 10psi at idle to 20psi @ WOT. The ECM code accommodated the change in pressure constantly recalculating fuel flow. Pretty cool stuff.

07-19-2011	#3
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: DIS: aftermarket system Dropped a note on the LPE facebook page to see what they think __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359