engineermike
Well-Known Member
I just went through this and wanted to add some facts to clear this up a bit and save someone else the trouble. This is regarding Gen3 Coyote GenV, 4-bolt Whipple blower:
The old 38's are the exact same length as the stock Gen3 Coyote and the 2020-22 GT500 injectors (sold as Ford Performance M-9593-M55GT). These are considered "Long body" injectors and NOT what Whipple supplies.
The spacers are just washer-shaped shims, not like tube-shaped extensions with o-rings. I'd love to know more about why these washers are needed rather than just machining the injector holes shallower.
The Whipple housing has 2 sets of fuel rail holes. The "Long" injectors mentioned above use the upper holes.
Whipple supplies the 2013/4 GT500 injectors with the later and current Gen3 kits, just as Lethal Stephen posted earlier, and Ford Performance calls these MU52s. The flow rate at 39 psi is nearly identical to the 55's in the 2020 GT500/M55GT. However, the injector data is fairly different at different pressure and flows, different minimum PW, different high/low breakpoint, etc., so they aren't interchangeable without tuning. Also, the 52 height is shorter than the 55's, as it is classified as a "Medium length" injector. These use the lower fuel rail screw holes in the Whipple lower manifold.
And finally a word of caution...sometimes tuners hack the injector data if they can't get the MAF or speed-density models correct. If you swap in different injectors and use correct data, it may not run right if the old injector data was bandaided.
The old 38's are the exact same length as the stock Gen3 Coyote and the 2020-22 GT500 injectors (sold as Ford Performance M-9593-M55GT). These are considered "Long body" injectors and NOT what Whipple supplies.
The spacers are just washer-shaped shims, not like tube-shaped extensions with o-rings. I'd love to know more about why these washers are needed rather than just machining the injector holes shallower.
The Whipple housing has 2 sets of fuel rail holes. The "Long" injectors mentioned above use the upper holes.
Whipple supplies the 2013/4 GT500 injectors with the later and current Gen3 kits, just as Lethal Stephen posted earlier, and Ford Performance calls these MU52s. The flow rate at 39 psi is nearly identical to the 55's in the 2020 GT500/M55GT. However, the injector data is fairly different at different pressure and flows, different minimum PW, different high/low breakpoint, etc., so they aren't interchangeable without tuning. Also, the 52 height is shorter than the 55's, as it is classified as a "Medium length" injector. These use the lower fuel rail screw holes in the Whipple lower manifold.
And finally a word of caution...sometimes tuners hack the injector data if they can't get the MAF or speed-density models correct. If you swap in different injectors and use correct data, it may not run right if the old injector data was bandaided.
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