Hi guys maybe you can help me out with this on my eforce equipped 06 Z06 Oem cam no headers.
Im not really up on injectors and fuel system solutions yet.

When we changed to a 3" pulley on the supercharger...

I was told by the tuner after he was doing his typical tuning my car while it was on the way out the door last minute...that the engine is "leaning out" and injectors/fuel system are maxed, injectors were at 100% duty cycle, that fuel pressure is "ok" but maybe pump is "getting old"....we shall see. Changing tuners anyhow.
I put the original pulley back on the charger for now.
Just installed a aem wideband guage if that helps, have tech 2 also.

I think the eforce came with 54 or 56lb injectors

I see a guy selling used id 850 injectors and read that they are a good way to go but that was advertizing.
His price is Ok i guess, at 650.00 but he also offerred me some 85lb injectors for 350.00

Id just as soon buy new if there is a chance of a hassle because any problems arent worth a few hundred bucks.

My question is, for my target of just under 700rwhp on daily driver what size injector should I be looking for and what is the best for tuning etc? Im sure this has been discussed at some point before but now a few years might have proven what the best combos really are.
Thanks!

 

ID 850's are fine and work great. If buying new I believe the 1000's are about the same price. If buying used just be careful as there are knockoffs out there. Also find out how old they are and what fuel was used.
Unless you really trust the seller that they are newish, I would get them cleaned and tested. With that added cost used doesn't always make sense. For reference, I believe i sold my ID 850's for 600. They were almost new at that time.

 

Sold some lightly used ID1000s for $650. Owner been running mid 8s all year on them and winning race after race.

I would look at doing an ECS stage 1 fuel pump setup and then ID850s/1000s. Never skimp on fuel parts.

 

I'd try to stick with ID's if you can swing it

850, 1000, 1300, all would be fine. I bought ID1000's just so I'd never need to upgrade and haven't had any issues. Tuned a stock longblock LS3 w/ID1700's a while back and it idled just fine too.. try that with some cheaper brands and I doubt it would do it quite so easy

 

ID's are the best.
If going cheaper I would only look at Bosch. They are not redrilled injectors. I remember there was a thread about the extended tip Bosch injectors with great reviews. I will link if I find it.

 

The Bosch 850 should be great for that setup if you don't want to spring for the Injector Dynamics. Just beware of cheap knock offs as others mentioned.
The stock OEM pump usually doesn't get "old" quick but not sure how much mileage is on it. Under 30k, maybe just but a Boost a pump on it. Good choice for that little extra

 

As you probably already know--industry standards is not to exceed 80% duty cycles
The only time you can get away with higher DC's if you are using your car mostly for drag racing where max DC's are there for only a few seconds and then the injectors have time to cool off--in autocross style racing where max DC's are there for a long time 80-85% should not be exceeded-----You can either increase fuel "pressure" or install larger injectors with the same fuel pressure
Fuel flow is something else---That all depends on your fuel pump max GPM and the efficiency of your fuel plumbing sizing---
A boost a pump type system which increases voltage in return will ADD more fuel pressure and GPM's as well --but sometimes not enough--
You need to have someone versed in fuel systems to try and match your actual "fuel demand" compared to what your existing system can produce---Both in fuel pressure and fuel volume