My 'burb is at 94,000 miles. It's time to start thinking about injectors. How much better are "high performance" injectors than stock callibrated injectors? For that matter, how much better are new stock injectors to stock injectors with 100,000 miles on them?? On average, hi performance injectors cost $150 more than stock. And sellers claim power gains in the neighborhood of 35 hp.
Also, is "hi-pop" another name for high performance injector? If so, how did this name come about??

I had 40 horse injectors from heath diesel in my truck. I did notice alittle difference but not a ton. I also had heaths computer chip. I really dont think you need new injectors becuase you have 100,000 on the motor. They really dont need to be changed every 100,000. But if your looking for more performance go to heathdiesel.com and talk to those guys. They know there **** when it comes to a 6.5

I'm about to buy a set of regular spec injectors for the old man's '96. I'm going for the napa "rebuilt" delphi injectors with the green caps.

I really dont think you need new injectors becuase you have 100,000 on the motor. They really dont need to be changed every 100,000.
...Its not like they fail right when the odometer hits 100k, but the nozzles will be in need of replacement very near to every 100k.

There is no 'calibration' for 6.5 injectors, you set the opening pressure thats it. Injectors do not meter fuel quantity, changing opening pressure will have a negligible effect on fuel quantity. Stock injectors also have no problem flowing higher quantities of fuel either, on the bang for the buck scale, 'hi-pop' 'hi-flow' 'hi-perf' 6.5 injectors, they're pricey and offer little appreciable difference over stock.

...Its not like they fail right when the odometer hits 100k, but the nozzles will be in need of replacement very near to every 100k.

There is no 'calibration' for 6.5 injectors, you set the opening pressure thats it. Injectors do not meter fuel quantity, changing opening pressure will have a negligible effect on fuel quantity. Stock injectors also have no problem flowing higher quantities of fuel either, on the bang for the buck scale, 'hi-pop' 'hi-flow' 'hi-perf' 6.5 injectors, they're pricey and offer little appreciable difference over stock.I agree. I have them and didn't notice anything

Is there a place where you can buy just the injector nozzles?

Whats the best way to tell if you need to replace the injectors? I have a bit of a rough idle (I notice it, but it really isn't too bad), but overall performance seems fine. I am at 135,000 miles.

rough idle is the #1 sign, white smoke will come next.

White smoke on acceleration, idle, or cruise (or all of the above)?

I have a set of JK which are supposed to be both Hi flow and Hi pop, them by themselves I did not notice a marked gain, they are IMO part of systematic build, from my experience I'd say last piece of the power build just before going 18:1.

Locally I can get mine flow checked/cleaned for $8/injector, if you suspect problems do that 1st replace truly bad/unrepairable ones, save coin for a set of Hi performance ones, until you have done all other stuff; IMO stock injectors if healthy will meet all your needs until truck is ready to bridge the gap of max power that IC or WMI with reflash/rechip unleashes.

Light white smoke at any time is usually an indicator, heavy smoke would normally indicate a different problem...like late timing. TDs right, most shops will check them for you pretty cheap.

TD,
What about a healthy puff of white smoke only at startup? I've only noticed it once, but it was undeniable. It happened on my first start of the day, morning time about 68Deg F. I think I might know the answer, but I value your opinion.

Light white smoke at any time is usually an indicator, heavy smoke would normally indicate a different problem...like late timing. TDs right, most shops will check them for you pretty cheap.

Is there a place where you can buy just the injector nozzles?
I found Bosch nozzles for my 94 at www.teamauto.com (http://www.teamauto.com) $13.98 each, haven't bought them yet. Not sure if I should replace the springs also. Never done it before, but seems pretty straight forward. Anybody got more info on rebuilding your own injectors.

BR 6.5

(Hmnn that looks like a Jr. Samples Hee-Haw number when you shorten it up :D , younger folks ask your parents if they remember BR-549, that is if they watched Hee-Haw)

Heavy white at start up is usually an indication of glow time insufficient, or nonfunctioning glows, or very cold morning starts does this happen always or just when it's cold out. Before going into heavy detail repost this in new thread something titled like heavy white smoke at start