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Originally Posted by Weasy2k
ahh i take that back then...would it be sever enough tho?
Would a heat build up of sorts occur?
Being a hydraulics person i like to learn the technical crap too :P
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The regulator guarantees injector 4 is properly pressurized. Because of the pressure drop issue, that means injector 1 is over-pressurized at the high output volume of the walbro. This means cylinder 1 is overfueled the worst, and the overfueling decreases as you traverse the fuel rail.
When boosting, the closed-loop system isn't active, so cylinder 1 will be overfueled, which can lead to carbon buildup over time and increase the compression ratio.
When not boosting, the closed-loop system sees the overfueled condition across all cylinders and pulls fuel from all cylinders. This means 1 still runs slightly rich, and 4 runs slightly lean.
This last part is what I wonder about. Toyota chose the point at which the ECU comes out of closed-loop assuming the cylinders were fairly evenly-fueled. Now that 4 is slightly lean, is this a problem? Does allowing slightly lean operation right before the point where the ECU starts dumping fuel create the potential for detonation?
I don't honestly know. Personally, I got a Wolfkatz rail so I wouldn't have to answer this question.
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Originally Posted by MR. 2Lanes
Would I need to change much other than my regulator if I have a Gen3 engine?
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All indications I have seen to date seem to point to the fact that this issue isn't present in the already-larger gen 3 fuel rail.