will factory 39# cobra injectors work with my 2000 gt?
#12
Here is a chart showing "rule of thumb" flywheel HP capacities for various injectors, at 40psi fuel pressure, at 75% and 85% duty cycle; the upper and lower limits of the operational "sweet spot".
At other fuel pressures use this formula to recalculate the injector capacity, or horsepower limits.
At other fuel pressures use this formula to recalculate the injector capacity, or horsepower limits.
#13
Pay no attention to the FI side of the above chart since it is way off. Fuel pressure is increased in FI applications while in boost allowing the injectors to support more. I had 60 lbs injectors and had 700rwhp (around 820 at the flywheel) and only at 80% DC.
#14
For example, 60lb/h injectors operated at 60 psi would create a scaling factor of (60/40)^0.5 = 1.225.
From the chart, 60s at 40psi and 85% d/c will support 680fwHP; so 60lb injectors @ 60psi will support 680 * 1.225 = 832fwHP.
Pretty close to your 820 isn't it? It would take only 3 psi more fuel pressure (63psi differential) to push the 60lb/h injectors to 820fwHP at 80% duty cycle...
#15
http://www.dallasmustang.com/mustang...04-STYLE/12924
this is what i was looking at? they dont seem to be cobra injectors themselves? so im thinking they still plug in? Personally id like 42# cuz its more common to see those, and i found a set for close to 300 bucks, but now the closest i can find is
http://www.dallasmustang.com/mustang...SET-OF-8/13113
so anyone know a better price or place for injectors that plug in?
this is what i was looking at? they dont seem to be cobra injectors themselves? so im thinking they still plug in? Personally id like 42# cuz its more common to see those, and i found a set for close to 300 bucks, but now the closest i can find is
http://www.dallasmustang.com/mustang...SET-OF-8/13113
so anyone know a better price or place for injectors that plug in?
#16
http://www.dallasmustang.com/mustang...04-STYLE/12924
this is what i was looking at? they dont seem to be cobra injectors themselves? so im thinking they still plug in?
this is what i was looking at? they dont seem to be cobra injectors themselves? so im thinking they still plug in?
Personally id like 42# cuz its more common to see those, and i found a set for close to 300 bucks, but now the closest i can find is
http://www.dallasmustang.com/mustang...SET-OF-8/13113
http://www.dallasmustang.com/mustang...SET-OF-8/13113
so anyone know a better price or place for injectors that plug in?[/QUOTE]
Here is the calibration info for the 39lb/h units, and here for the 42s...
#17
so sounds like the 42# are my better bet. bigger injector, plug n play instead of splice or buy connectors. Im assuming since im paying a guy for dyno i wont need the injector slope information? altho its good to know who to get all my optimal tuning parameters from.
#19
BTW, the slopes are listed in the specs in lb/s, multiply by 3600 to get lb/h.
The breakpoint is in lb/engine revolution, some tuning systems list it in μlbs/rev (micro lbs) so the 0.0000212000 shown on the data sheet would be 21.2μlb/rev...