Ok. Let's say I put in 50 or 90 HP size injectors and I wait to put in a bigger turbo...(right now my truck is in the shop for injector issues and since I am putting on a bigger turbo next month I thought to maybe increase inj. size since they might need to be replaced)

Will my truck smoke all the time or just under load? My fuel economy, will it tank? And if I do end up wasting fuel, is there a way of choking the fuel back so I don't waste so much until the new turbo goes on?

Do bigger injectors supply more fuel through the different nozzle design or does it have to do with it's whole design? Why would a person replace a perfectly good set of stock injectors instead of just upgrading the tip?

 

Your truck will not smoke all the time. at start up you may see a little smoke then under load/acceleration you will have smoke. Your fuel economy can actually increase depending on how you drive. People respond differently to increased power, in my case my mpg has dropped lol. lots of people do just change the nozzles tips if there is no known problem with the injector. as far as i know the aftermarket nozzles increase fuel flow by using more holes that are slightly larger than stock. i upgraded mine to ddp 90s and love it.

 

Is it fairly straightforward changing them out yourself? The shop fixing my truck made reference that the injector that failed is "easy to get at". So I assume the back one(s) are difficult?

 

they really are not that hard to get to front or back. i think it was hard to get my torque wrenches on the back nuts/bolts due to clearance issues

 

There is a tiny little metal puck inside, between the nozzle and the body. Make sure it goes back in and in the same direction as it came out, as there is an up/down position.

As for smoke levels at WOT, lots of variables there. Larger nozzles just give you the ablity to have more fuel, but there is only so much fuel available in rail, so you'll have to monitor the rail for pressure, might have to do the CP mix bag of parts if the rail pressure drops to much.

If you get a decently upgraded nozzle, you'll hardly see any issues at idle or low power conditions.