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2G What injectors do I need for Walbro 255?

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Not sure if you mean brands or injector size.

If you mean size, can't answer that question without knowing your goals. If you are keeping the car at stock boost and power levels, then the upgrades are unnecessary. Stock injectors are fine. Let us know your power goals and we can make some suggestions. You can also go to Fuel Injector Clinic's web site and use their injector sizing tool/chart to determine what injector size to go with.
 
Your question is a bit hard to understand but if you mean for an otherwise stock car, your stock 450cc injectors would do fine. With an adjustable fuel pressure regulator you won’t have to worry about over run from the 255 therefore the 2 will do the same as a stock fpr and fuel pump. Ecmlink can control stock 450cc injectors up to their limit same as anything larger. Shoot if you were to install the adjustable regulator set at stock base pressure and the Walbro 255 in an otherwise stock car without ecmlink it would run just as a stock car would, the 255 isn’t going to make it richer or flow more fuel than what the ecu is telling the injectors to do.
 
As mentioned previously, it depends on your goals. I am running a Walbro 255 with an Aeromotive AFPR and ECMLink V3, and I was originally going to go with 650cc injectors so that I could make my 300+ horsepower goal. However, after someone on YouTube left a comment about how I should go bigger, I decided to go with some DeatschWerks 1000cc injectors in case I ever wanted to up the power.

With the setup you described, you could go with a large variety of injector sizes -- all depends on what you want 🙂
 
Whatever the flow rate you want (within reason). You use ECMlink to adjust.
Injectors aren't cheap, so figure what you want to do in the future. If that means you'd need to buy bigger not far down the road, just do it now. Again, within reason.

My personal recommendations would first be FIC then ID, with either in High-Z.

I originally bought 750 and ran them above 80% IDC, so I recently upgraded to 1200.. but I had those 750s for 12 years.
(Now my aspirations are tanked anyway due to end play)
 
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