lowridin2g
20+ Year Contributor
- 904
- 2
- Sep 5, 2002
-
Pembroke,
Massachusetts
i have had my FIC 650 cc injectors for about 4 months now. when i switched out my rc 550's, the 650s flare at the end and wouldnt fit in the head with those plastic orings that are in the head. realizing that the 650's came with rubber grommets on the end stems (where they go into the head) i figured those would seal properly with the fuel rail tourqued down properly and all three fuel rail mouniting isolators in place. so i went ahead and removed all four plastic orings in the head. to make a long story short i have had no problems to this day with leaking fuel......or have i?
i have never felt any studder under boost. never get the smell of fuel under boost. after some hard runs, if i were to pop the hood, there would be zero fuel anywhere around the injectors. this leads me to believe that the injectors are sealing correctly and not leaking under boost.
on the other hand the head is so hot under normal operating temp. that any mispelt fuel would instantly burn off especially if it was a little leaking out. so theyre would be no way to tell. doing a boost leak test would also not yield accurate results as if they were leaking cause the air you force into the ic pipes/turbo and such does not flow into the head.
upon searching around the engine performance forum as i always do i have stumbled across a couple threads debating wether or not these injectors will leak with the factory plastic orings removed. because once again the 650;s will not fit with them in place in the head. some guys have said that therey leak some have said that they will not. some have personal experiences where the injectors sprayed fuel out under boost some say they are fine. the only real way to find out that i can think of is to have someone rev the car up while u spray brake clean/ carb clean at the tips of the injectors cause if they are leaking the car will start to run like crap and most likely stall out. or u guys with your automatics can brake tourque at a stand still building some boost while someone sprays that crap in there.
all in all i wish we could find a final answer for this. im gonna experiment with this myself and try and figure out if mine have been leaking all along, hindering performance. u guys with REAL LIFE EXPERIENCE ON THIS SUBJECT please lend me your thoughts. thanks a bundle
i have never felt any studder under boost. never get the smell of fuel under boost. after some hard runs, if i were to pop the hood, there would be zero fuel anywhere around the injectors. this leads me to believe that the injectors are sealing correctly and not leaking under boost.
on the other hand the head is so hot under normal operating temp. that any mispelt fuel would instantly burn off especially if it was a little leaking out. so theyre would be no way to tell. doing a boost leak test would also not yield accurate results as if they were leaking cause the air you force into the ic pipes/turbo and such does not flow into the head.
upon searching around the engine performance forum as i always do i have stumbled across a couple threads debating wether or not these injectors will leak with the factory plastic orings removed. because once again the 650;s will not fit with them in place in the head. some guys have said that therey leak some have said that they will not. some have personal experiences where the injectors sprayed fuel out under boost some say they are fine. the only real way to find out that i can think of is to have someone rev the car up while u spray brake clean/ carb clean at the tips of the injectors cause if they are leaking the car will start to run like crap and most likely stall out. or u guys with your automatics can brake tourque at a stand still building some boost while someone sprays that crap in there.
all in all i wish we could find a final answer for this. im gonna experiment with this myself and try and figure out if mine have been leaking all along, hindering performance. u guys with REAL LIFE EXPERIENCE ON THIS SUBJECT please lend me your thoughts. thanks a bundle
