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Message: [QUOTE="96F350KID, post: 1422898, member: 1608"] I have customers with injectors from every one. Some sets idle great but suck at 2k. Some break up at 1800 and idle great. If they all flow even on a bench and the ECU only looks at cylinder 1&8 for timing on these old things it's not going to effect performance like most people think. Most of the ones out there that idle great don't flow anything past 2600rpm. Here locally we have a fuel shop that doesn't do performance injectors but rather does stock rebuilds. When I have issues with these things I take it to them to verify on the bench. Tell them what duration and rpm to run them at. It's not rocket science but since these things are so stupid and bulky to get any kind of response from compared to a common rail unit you can only mod them so far before you effect idle performance. Like a gas engine with a big cam. Other than poppet issues which are like a noticeable miss, a rough or rumble idle is the amount of fuel you are moving per injector cycle. I've never seen a high flow injector idle smooth using a 200%+ nozzle other than on an injector that didn't move a large volume of fuel. My 400/300s idle rough but don't haze as bad as some 200% nozzles and above 1200rpm they run smoother and smoother until they fall off. The idle argument has been going on for forever but no one has any proof or does any testing other then bitching about it. If people thought the same thing about big lift cams no one would ever have explored that area. Point of my long story is huge fueling injectors for large hp numbers will never run like a stock truck. [/QUOTE]

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